Pedro Almeida

Room in IBEB

0.14

Contacts

E-mail: palmeida[at]ciencias.ulisboa.pt

Professional networks

Research topics

Medical Imaging
Medical Physics
Radiation Protection

Biography

Pedro Almeida was born in Lisbon in 1968 and holds a PhD in Biomedical Engineering by the University of Paris. He is an Assistant Professor at Ciências-ULisboa since 1999. During the last 20 years he has been involved in medical imaging research and teaching. He has served as IBEB’s director and is now vice-dean at Ciências-ULisboa. He is a consultant in Medical Physics and Radiation Protection and a certified expert in these areas.

Publications

Journal publications

Pedro Almeida, Pedro Vaz, Tiago Madaleno (2023) Ana Cravo Sa 1, 2, 3*, Andreia Barateiro 4, Bryan P. Bednarz5, Out-of-field second primary cancer induction: Radiation-biology, epidemiology, dosimetry and modelling 16648714, p. 128, Frontiers Media SA

Ana M. Mota, Matthew J. Clarkson, Pedro Almeida, Nuno Matela (2022) Automatic Classification of Simulated Breast Tomosynthesis Whole Images for the Presence of Microcalcification Clusters Using Deep CNNs, Journal of Imaging 8(9), p. 231, MDPI, doi:10.3390/jimaging8090231

Ana Cravo Sá, Andreia Barateiro, Bryan P. Bednarz, Pedro Almeida, Pedro Vaz, Tiago Madaleno (2022) Comparison of 3DCRT and IMRT out-of-field doses in pediatric patients using Monte Carlo simulations with treatment planning system calculations and measurements, Frontiers in Oncology 12, p. 879167, Frontiers, doi:10.3389/fonc.2022.879167

A. M. Mota, M. J. Clarkson, P. Almeida, L. Peralta, N. Matela (2020) Impact of total variation minimization in volume rendering visualization of breast tomosynthesis data, Computer Methods and Programs in Biomedicine 195, p. 105534, Elsevier, doi:10.1016/j.cmpb.2020.105534

Ana M. Mota, Matthew J. Clarkson, Pedro Almeida, Nuno Matela (2020) Optimization of Breast Tomosynthesis Visualization through 3D Volume Rendering, Journal of Imaging 6(7), doi:10.3390/JIMAGING6070064

Ana M. Mota, Matthew J. Clarkson, Pedro Almeida, Nuno Matela (2020) An Enhanced Visualization of DBT Imaging Using Blind Deconvolution and Total Variation Minimization Regularization, IEEE Transactions on Medical Imaging 39(12), p. 4094-4101, IEEE, doi:10.1109/TMI.2020.3013107

Joaquim C. Reis, Luzia Travado, Michael H. Antoni, Francisco P.M. Oliveira, Silvia D. Almeida, Pedro Almeida, Aaron S. Heller, Berta Sousa, Durval C. Costa (2020) Negative affect and stress-related brain metabolism in patients with metastatic breast cancer, Cancer 126(13), p. 3122-3131, pubmed, doi:10.1002/cncr.32902

Ana Cravo Sá, Andreia Barateiro, Bryan Bednarz, Cecília Borges, Joana Pereira, Mariana Baptista, Miguel Pereira, Miriam Zarza-Moreno, Pedro Almeida, Pedro Vaz, Tiago Madaleno, Yuriy Romanets (2020) Assessment of out-of-field doses in radiotherapy treatments of paediatric patients using Monte Carlo methods and measurements, Physica Medica 71, p. 53-61, Elsevier, doi:10.1016/j.ejmp.2020.02.008

P. M.M. Correia, J. Menoita, A. L.M. Silva, N. Romanyshyn, J. F.C.A. Veloso, P. M. Sá, N. Matela, P. Almeida (2019) An EDUGATE simulation toolkit based on the educational easyPET, Biomedical Physics and Engineering Express 5(2), p. 25009, IOP Publishing, doi:10.1088/2057-1976/aae4d4

Almeida S.D., Oliveira F.P.M., Costa D.C., Castanheira J.C., Silva M., Reis J.C., Almeida P., Travado L. (2019) Assessment of brain regional hypometabolism in metastatic breast cancer patients with 18F-fluorodeoxiglucose: Influence of the reference region, European Journal of Nuclear Medicine and Molecular Imaging 46(1), p. S790-S791, EANM'19, url

Ana Germano, Willian Schmitt, Pedro Almeida, Rui Mateus-Marques, Valeriano Leite (2018) Ultrasound requested by general practitioners or for symptoms unrelated to the thyroid gland may explain higher prevalence of thyroid nodules in females, Clinical Imaging 50, p. 289-293, Elsevier, doi:10.1016/j.clinimag.2018.05.003

B Guerreiro, P Pereira, R Rosa, S Valente, E Sousa, P Almeida, F Branco, T Freixo, F D Jonge, T C Ferreira, L Vieira, Universidade De Lisboa (2017) Adipose tissue in attenuation and scattering correction in myocardial perfusion SPECT/CT: a phantom study.(1), url

Ana Rodrigues Gouveia, Coert Metz, Luis Freire, Pedro Almeida, Stefan Klein (2017) Registration-by-regression of coronary CTA and X-ray angiography, Computer Methods in Biomechanics and Biomedical Engineering: Imaging and Visualization 5(3), p. 208-220, Taylor & Francis, doi:10.1080/21681163.2015.1054520

N. Oliveira, A. M. Mota, N. Matela, L. Janeiro, P. Almeida (2016) Dynamic relaxation in algebraic reconstruction technique (ART) for breast tomosynthesis imaging, Computer Methods and Programs in Biomedicine 132, p. 189-196, Elsevier, doi:10.1016/j.cmpb.2016.05.001

Ana M. Mota, Nuno Matela, Nuno Oliveira, Pedro Almeida (2015) Total variation minimization filter for DBT imaging, Medical Physics 42(6), p. 2827-2836, doi:10.1118/1.4919680

L. Vieira, D. C. Costa, P. Almeida (2015) The influence of number of counts in the myocardium in the determination of reproducible functional parameters in gated-SPECT studies simulated with GATE, Revista Espanola de Medicina Nuclear e Imagen Molecular 34(6), p. 339-344, Elsevier Doyma, doi:10.1016/j.remn.2015.04.005

S Branco, P Almeida, & S Jan (2015) Small Animal Simulation Studies using the microPET ® FOCUS System and the GATE Platform, International Journal for Computational Vision and Biomechanics 1(2), p. 142-149, url

F. Costa, P. Teles, A. Nogueira, A. Barreto, A. I. Santos, A. Carvalho, B. Martins, C. Oliveira, C. Gaspar, C. Barros, D. Neves, D. Costa, E. Rodrigues, F. Godinho, F. Alves, G. Cardoso, G. Cantinho, I. Conde, J. Vale, J. Santos, J. Isidoro, J. Pereira, L. Salgado, M. Rézio, M. Vieira, P. Simãozinho, P. Almeida, R. Castro, R. Parafita, S. Pintão, T. Lúcio, T. Reis, P. Vaz (2015) Estimation of the collective ionizing dose in the Portuguese population for the years 2011 and 2012, due to nuclear medicine exams, Revista Espanola de Medicina Nuclear e Imagen Molecular 34(1), p. 1-8, Elsevier Doyma, doi:10.1016/j.remn.2014.03.009

T. Marques, A. Ribeiro, S. Di Maria, A. Belchior, J. Cardoso, N. Matela, N. Oliveira, L. Janeiro, P. Almeida, P. Vaz (2015) Effect of the glandular composition on digital breast tomosynthesis image quality and dose optimisation, Radiation Protection Dosimetry 165(1-4), p. 337-341, Oxford University Press, doi:10.1093/rpd/ncv124

M. Baptista, S. Di Maria, N. Oliveira, N. Matela, L. Janeiro, P. Almeida, P. Vaz (2014) Image quality and dose assessment in digital breast tomosynthesis: A Monte Carlo study, Radiation Physics and Chemistry 104, p. 158-162, Pergamon, doi:10.1016/j.radphyschem.2013.12.036

A. Belchior, I. Balásházy, O. Monteiro Gil, P. Vaz, P. Almeida (2014) Does the number of irradiated cells influence the spatial distribution of bystander effects?, Dose-Response 12(4), p. 525-539, SAGE Publications, doi:10.2203/dose-response.14-001.Belchior

L. Vieira, T. F. Vaz, D. C. Costa, P. Almeida (2014) Monte Carlo simulation of the basic features of the GE Millennium MG single photon emission computed tomography gamma camera, Revista Espanola de Medicina Nuclear e Imagen Molecular 33(1), p. 6-13, Elsevier Doyma, doi:10.1016/j.remn.2013.03.009

A. Santos Ribeiro, E. Rota Kops, H. Herzog, P. Almeida (2014) Hybrid approach for attenuation correction in PET/MR scanners, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 734(PART B), p. 166-170, North-Holland, doi:10.1016/j.nima.2013.09.034

Ricardo M. Capote, Nuno Matela, Raquel C. Conceição, Pedro Almeida (2013) Optimization of convergent collimators for pixelated SPECT systems, Medical Physics 40(6), p. 13, doi:10.1118/1.4804053

A. Belchior, O. Monteiro Gil, P. Almeida, P. Vaz (2013) Dose and time dependence of targeted and untargeted effects after very low doses of α-particle irradiation of human lung cancer cells, Dose-Response 11(3), p. 431-446, SAGE Publications, doi:10.2203/dose-response.12-036.Belchior

L. Caldeira, J. Scheins, P. Almeida, H. Herzog (2013) Evaluation of two methods for using MR information in PET reconstruction, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 702, p. 141-143, North-Holland, doi:10.1016/j.nima.2012.08.108

Lina Vieira, Pedro Almeida, Durval C. Costa (2013) Image quality of myocardial perfusion-gated studies: Effect of ingestion of different fat content in the reduction of extra-myocardial abdominal signal, Computer Methods in Biomechanics and Biomedical Engineering: Imaging and Visualization 1(2), p. 61-68, Taylor & Francis Group, doi:10.1080/21681163.2013.764611

N. A. Da Silva, H. Herzog, C. Weirich, L. Tellmann, E. Rota Kops, H. Hautzel, P. Almeida (2013) Image-derived input function obtained in a 3TMR-brainPET, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 702, p. 22-25, North-Holland, doi:10.1016/j.nima.2012.08.030

André H. Dias, Sophia Pintão, Pedro Almeida, Teresa Martins (2013) Comparison of GFR calculation methods: MDRD and CKD-EPI vs. 99mTc-DTPA tracer clearance rates, Scandinavian Journal of Clinical and Laboratory Investigation 73(4), p. 334-338, Taylor & Francis, doi:10.3109/00365513.2013.780663

A. Santos Ribeiro, E. Rota Kops, H. Herzog, P. Almeida (2013) Skull segmentation of UTE MR images by probabilistic neural network for attenuation correction in PET/MR, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 702, p. 114-116, North-Holland, doi:10.1016/j.nima.2012.09.005

Pedro Miguel Dinis Almeida (2013) Improving iterative image reconstruction for X-ray CT, Computers in Biology and Medicine 43(8), p. 1062, doi:10.1016/j.compbiomed.2013.05.013

Carla Lança, Cláudia Reis, Luís Lança (2012) Perceção visual na avaliação diagnóstica em mamografia : uma revisão sistemática Visual perception and diagnostic evaluation in mammography : a systematic review, Saúde & Tecnologia, p. 45-55, Escola Superior de Tecnologia da Saúde de Lisboa

Luís Martins, Nuno C. Ferreira, Francisco Caramelo, Catarina Ortigão, Ana S. Rodrigues, Fabiana Rodrigues, R. Bugalho, J. Varela, P. Almeida, M. Castelo-Branco (2012) Scatter Correction for Positron Emission Mammography using an Estimation of Trues Method Approach, Procedia Technology 5, p. 903-911, Elsevier, doi:10.1016/j.protcy.2012.09.100

Pedro Almeida (2011) A Review on Recent Developments in Positron Emission Tomography Technology, Recent Patents on Medical Imaging 1(1), p. 5-25, Bentham Science Publishers, doi:10.2174/2210684711101010005

Ana Belchior, Octávia Monteiro Gil, Pedro Almeida, Pedro Vaz (2011) Evaluation of the cytotoxicity and the genotoxicity induced by α radiation in an A549 cell line, Radiation Measurements 46(9), p. 958-961, Pergamon, doi:10.1016/j.radmeas.2011.04.014

Susana Branco, Pedro Almeida, Sebastien J (2011) Evaluation of the Respiratory Motion Effect in Small Animal PET Images with GATE Monte Carlo Simulations, Applications of Monte Carlo Methods in Biology, Medicine and Other Fields of Science, IntechOpen, doi:10.5772/15040

J. Mesquita, N. Matela, N. Oliveira, M. V. Martins, P. Almeida (2010) Choosing the ART relaxation parameter for Clear-PEM 2D image reconstruction, Computer Methods and Programs in Biomedicine 98(2), p. 183-190, Elsevier, doi:10.1016/j.cmpb.2009.11.010

N. Matela, M. V. Martins, N. Oliveira, P. Rodrigues, A. Trindade, J. Varela, P. D. Almeida (2010) System matrix calculation for 2D image reconstruction algorithms for the clear-PEM scanner, International Journal of Tomography and Statistics 13(W10), p. 98-125

Ana Belchior, Luis Peralta, Pedro Almeida, Pedro Vaz (2010) Calibration of an alpha particle irradiator for in vitro cells irradiation, International Journal of Low Radiation 7(6), p. 500-510, Inderscience Publishers, doi:10.1504/IJLR.2010.037671

Ana Belchior, Pedro Teles, Luis Peralta, Pedro Almeida, Pedro Vaz (2010) Monte-Carlo Simulation and Microdosimetry Analysis of an Α -Particle Source for Cell Irradiation 2010(Li)

C S Ferreira, R Bugalho, J Varela, N Matela, C Ortigao, P Almeida, N Oliveira, A Teixeira (2010) Initial Evaluation of Real Data Obtained With the Clear-PEM Scanner, Eur. J. Nucl. Med. Mol. Imaging 37, p. S309

N. Oliveira, N. Matela, R. Bugalho, N. Ferreira, P. Almeida (2009) Optimization of 2D image reconstruction for positron emission mammography using IDL, Computers in Biology and Medicine 39(2), p. 119-129, Pergamon, doi:10.1016/j.compbiomed.2008.11.011

M. C. Abreu, D. Aguiar, E. Albuquerque, F. G. Almeida, P. Almeida, P. Amaral, E. Auffray, P. Bento, P. Bruyndonckx, R. Bugalho, B. Carriço, H. Cordeiro, M. Ferreira, N. C. Ferreira, F. Gonçalves, P. Lecoq, C. Leong, F. Lopes, P. Lousã, J. Luyten, M. V. Martins, N. Matela, P. R. Mendes, R. Moura, J. Nobre, N. Oliveira, C. Ortigão, L. Peralta, J. Rego, R. Ribeiro, P. Rodrigues, A. I. Santos, J. C. Silva, M. M. Silva, S. Tavernier, I. C. Teixeira, J. P. Teixeira, A. Trindade, J. Trummer, J. Varela (2007) Clear-PEM: A PET imaging system dedicated to breast cancer diagnostics, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 571(1-2 SPEC. ISS.), p. 81-84, North-Holland, doi:10.1016/j.nima.2006.10.034

S. Branco, P. Almeida, S. Jan (2007) Monte carlo simulations studies in small animal PET, Proceedings of the International Symposium CompIMAGE 2006 - Computational Modelling of Objects Represented in Images: Fundamentals, Methods and Applications 580(2), p. 111-115, Elsevier

C Cardoso, L C Freire, P D Almeida (2007) 8.27, Journal of Nuclear Cardiology 2(14), p. S64

Susana Branco, Sébastien Jan, Pedro Almeida, Universidade De Lisboa (2007) Molecular Imaging of Small Animals PET using Monte Carlo Simulations, Eletrónica e Telecomunicações 4(7), p. 845-848

Maria C. Abreu, João D. Aguiar, Fernando G. Almeida, Pedro Almeida, Pedro Bento, Bruno Carriço, Miguel Ferreira, Nuno C. Ferreira, Fernando Gonçalves, Carlos Leong, Filipe Lopes, Pedro Lousã, Mónica V. Martins, Nuno Matela, Pedro R. Mendes, Rui Moura, João Nobre, Nuno Oliveira, Catarina Ortigão, Luís Peralta, Rui Pereira, Joel Rego, Rui Ribeiro, Pedro Rodrigues, José Sampaio, Ana I. Santos, Luís Silva, José C. Silva, Patrick Sousa, Isabel C. Teixeira, João P. Teixeira, Andreia Trindade, João Varela (2006) Design and evaluation of the clear-PEM scanner for positron emission mammography, IEEE Transactions on Nuclear Science 53(1), p. 71-77, IEEE, doi:10.1109/TNS.2006.870173

L. Janeiro, C. Comtat, C. Lartizien, P. E. Kinahan, M. Defrise, C. Michel, R. Trébossen, P. Almeida (2006) Numerical observer studies comparing FORE + AWOSEM, FORE + NECOSEM and NEC based fully 3-D OSEM for 3-D whole-body PET imaging, IEEE Transactions on Nuclear Science 53(3), p. 1194-1199, IEEE, doi:10.1109/TNS.2006.870089

M. C. Abreu, P. Almeida, F. Balau, N. C. Ferreira, S. Fetal, F. Fraga, M. Martins, N. Matela, R. Moura, C. Ortigão, Luis Peralta, P. Rato, R. Ribeiro, P. Rodrigues, A. I. Santos, A. Trindade, J. Varela (2005) Clear-PEM: A dedicated pet camera for improved breast cancer detection, Radiation Protection Dosimetry 116(1-4), p. 208-210, doi:10.1093/rpd/nci039

N P L Matela, A Trindade, Martins MV, N Oliveira, P Rodrigues, L Peralta, J Varela, P M D Almeida (2004) Algebraic reconstruction technique (ART) using linograms, EUROPEAN JOURNAL OF NUCLEAR MEDICINE AND MOLECULAR IMAGING 31, p. S271--S272, SPRINGER

R. Ribeiro, C. Abreu, P. Almeida, F. Balau, P. Bordalo, N. C. Ferreira, S. Fetal, F. Fraga, P. Lecoq, M. Martins, N. Matela, R. Moura, C. Ortigão, L. Peralta, S. Ramos, P. Rato, P. Rodrigues, A. I. Santos, A. Trindade, J. Varela (2004) Breast imaging with a dedicated PEM, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 527(1-2), p. 87-91, North-Holland, doi:10.1016/j.nima.2004.03.081

S Carmona, J Sequeira, A S Capacho, F Costa, A Quintal, L Dias, F Lucena, M J Carapinha, M Filipe, A Daniel, others (2003) 99MTC-labelled autologous erythrocytes for the study of hepatic haemangiomas-Retrospective analysis, World Journal of Nuclear Medicine 2

Maria João Ribeiro, Philippe Remy, Bernard Bendriem, Pedro Almeida, Vincent Brulon, Yves Samson, Bernard Mazière, Régine Trébossen (2000) Comparison of clinical data sets acquired on different tomographs using 6-18F-L-dopa, European Journal of Nuclear Medicine 27(6), p. 707-712, Springer-Verlag, doi:10.1007/s002590050566

Georges El Fakhri, Irène Buvat, Pedro Almeida, Bernard Bendriem, Andrew Todd-Pokropek, Habib Benali (2000) Should scatter be corrected in both transmission and emission data for accurate quantitation in cardiac SPET?, European Journal of Nuclear Medicine 27(9), p. 1356-1364, Springer-Verlag, doi:10.1007/s002590000304

M. J. Ribeiro, P. Almeida, B. Bendriem, P. Hugonnard, P. Grangeat, R. Trebossen (2000) Quantification absolue de la fixation radioactive dans les noyaux gris centraux en TEMP: Etude sur fantome anthropomorphique, Medecine Nucleaire 24(2), p. 85-97

G El Fakhri, I Buvat, H Benali, M Pelegrini, P Almeida, B Bendriem, A Todd-Pokropek, R Di Paola (1999) Letters to the editor-With a reply-Investigation of physical phenomena affecting scintigraphic images, European Journal of Nuclear Medicine 26(12), p. 1631, Heidelberg, Germany: Springer International, 1976-c2001.

J. Mas, P. Hannequin, G. El Fakhri, I. Buvat, H. Benali, M. Pelegrini, P. Almeida, B. Bendriem, A. Todd-Pokropek, R. Di Paola (1999) Investigation of physical phenomena affecting scintigraphic images [3] (multiple letters), European Journal of Nuclear Medicine 26(12), p. 1630-1631, SPRINGER 233 SPRING ST, NEW YORK, NY 10013 USA

Maria João Ribeiro, Pedro Almeida, Daniel Strul, Nuno Ferreira, Christian Loc'h, Vincent Brulon, Régine Trébossen, Bernard Mazière, Bernard Bendriem (1999) Comparison of fluorine-18 and bromine-76 imaging in positron emission tomography, European Journal of Nuclear Medicine 26(7), p. 758-766, Springer-Verlag, doi:10.1007/s002590050447

Georges N. El Fakhri, Irène Buvat, Mélanie Pélégrini, Habib Benali, Pedro Almeida, Bernard Bendriem, Andrew Todd-Pokropek, Robert Di Paola (1999) Respective roles of scatter, attenuation, depth-dependent collimator response and finite spatial resolution in cardiac single-photon emission tomography quantitation: A Monte Carlo study, European Journal of Nuclear Medicine 26(5), p. 437-446, Springer-Verlag, doi:10.1007/s002590050409

Pedro Almeida, Maria João Ribeiro, Michel Bottlaender, Christian Loc'h, Oliver Langer, Daniel Strul, Patrick Hugonnard, Pierre Grangeat, Bernard Mazière, Bernard Bendriem (1999) Absolute quantitation of iodine-123 epidepride kinetics using single- photon emission tomography: Comparison with carbon-11 epidepride and positron emission tomography, European Journal of Nuclear Medicine 26(12), p. 1580-1588, Springer-Verlag, doi:10.1007/s002590050498

P. Almeida, B. Bendriem, O. De Dreuille, A. Peltier, C. Perrot, V. Brulon (1998) Erratum: Dosimetry of transmission measurements in nuclear medicine: A study using anthropomorphic phantoms and thermoluminescent dosimeters (European Journal of Nuclear Medicine (1998) 25 (1435-1441)), European Journal of Nuclear Medicine 25(12), p. 1686, Springer-Verlag

Olivier de Dreuille, Veronique Strijckmans, Pedro Almeida, Christian Loc'h, Bernard Bendriem (1996) Bone equivalent liquid solution to assess accuracy of transmission measurements in SPECT and PET, IEEE Nuclear Science Symposium & Medical Imaging Conference 2(3), p. 1444-1447, doi:10.1109/nssmic.1996.591719

M J Ribeiro, P Almeida, B Bendriem, P Hugonnard, P Grangeat, R Trébossen () Article 0 riginal MJ Ribeiro

L Janeiro, C Comtat, R Trébossen, P Almeida () The use of a NPWMF observer to compare 3D NEC-OSEM FORE+ 2D NEC-OSEM in whole-body PET

A. Traverse, G. Leo, J. G. Alves, P. M. Almeida, M. F. Da Silva, J. C. Soares (1993) Disorder creation and annealing in Hg implanted CdTe, Nuclear Inst. and Methods in Physics Research, B 80-81(PART 2), p. 938-942, North-Holland, doi:10.1016/0168-583X(93)90713-G

Conference publications

Ana Mota, Matthew Clarkson, Pedro Almeida, Nuno Matela (2022) Detection of Microcalcifications in Digital Breast Tomosynthesis using Faster R-CNN and 3D Volume Rendering, PROCEEDINGS OF THE 15TH INTERNATIONAL JOINT CONFERENCE ON BIOMEDICAL ENGINEERING SYSTEMS AND TECHNOLOGIES (BIOIMAGING), VOL 2, p. 80-89, doi:10.5220/0010938800003123

A. Martins, I. Rodrigues, S. Carmona, M. J. Vieira, C. Pio, T. Martins, A. Alvernaz, L. Oliveira (2022) Clinical Audits in Nuclear Medicine: a Modifed Model Adapted to the Portuguese Reality, European Journal of Nuclear Medicine and Molecular Imaging 49(SUPPL 1), p. S384--S384

A Martins, P Almeida, I Rodrigues, S Carmona, M J Vieira, C Pio, T Martins, A Alvernaz, L Oliveira (2022) Diagnostic Reference Levels in Nuclear Medicine: Development of a Simple Tool to Help Assessing the Portuguese Reality, European Journal of Nuclear Medicine and Molecular Imaging 49(SUPPL 1), p. S386, url

Luzia Travado, Joaquim C. Reis, Michael H. Antoni, Elsa Seixas, Francisco Oliveira, Berta Sousa, Silvia D. Almeida, Pedro Almeida, Durval Costa (2021) Emotional Distress, Brain Functioning, Social Well-Being and Biobehavioral Processes in Metastatic Breast Cancer Patients: Outcomes of the Distressbrain Project, The Breast 59, p. S55-S56, doi:10.1016/s0960-9776(21)00564-6

Ana Margarida Mota, Matthew J. Clarkson, Lurdes Orvalho, Pedro Almeida, Nuno Matela (2020) Calculation of transfer functions for volume rendering of breast tomosynthesis imaging, 15th International Workshop on Breast Imaging (IWBI2020) 11513, p. 12, doi:10.1117/12.2559932

Joaquim C. Reis, Luzia Travado, Michael H. Antoni, Silvia D. Almeida, Francisco Oliveira, Berta Sousa, Pedro Almeida, Joana Castanheira, Durval Costa (2019) Emotional Distress and Brain Functioning Metabolism in Metastatic Breast Cancer Patients: a Neuro-Imaging Study With 18F-Fdg Pet/Ct, The Breast 48, p. S64, doi:10.1016/s0960-9776(19)30722-2

Luzia Travado, Joaquim C Reis, Durval Costa, Berta Sousa, Pedro Almeida, Michael Antoni, Ana Domingos, Elsa Seixas, Albino Maia, Joana Castanheira (2018) Distress, brain metabolism, and inflammatory processes: A study with metastatic breast cancer patients, PSYCHO-ONCOLOGY 27, p. 107

. Travado, Reis, Costa et al. (2017) Distress and regional brain metabolism in metastatic breast cancer patients: Methodology and preliminary results of a study using PET, Psycho-Oncology. Supplement Abstracts 26(19th World Congress of Psycho-Oncology and Psychosocial Academy, Berlin), p. 152

Ana M. Mota, Nuno Oliveira, Pedro Almeida, Nuno Matela (2016) 3D total variation minimization filter for breast tomosynthesis imaging, Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 9699, p. 501-509, doi:10.1007/978-3-319-41546-8_63

A. M. Mota, N. Matela, N. Oliveira, P. Almeida (2016) An iterative algorithm for total variation minimization in DBT imaging, Computational Vision and Medical Image Processing V - Proceedings of 5th Eccomas Thematic Conference on Computational Vision and Medical Image Processing, VipIMAGE 2015, p. 119-122, doi:10.1201/b19241-21

R. C. Conceicao, R. M. Capote, B. L. Oliveira, P. Almeida, M. Glavin, E. Jones, M. O'Halloran (2013) Novel multimodal PEM-UWB approach for breast cancer detection: Initial study for tumour detection and consequent classification, 2013 7th European Conference on Antennas and Propagation, EuCAP 2013, p. 630-634

Cláudia S. Ferreira, Liji Cao, Ricardo Bugalho, Nuno Matela, Catarina Ortigão, João Varela, Pedro Almeida (2013) Scatter and attenuation corrections for a PEM detector using List-Mode OSEM, IEEE Nuclear Science Symposium Conference Record, p. 1-4, doi:10.1109/NSSMIC.2013.6829264

L. Caldeira, J. Scheins, P. Almeida, H. Herzog (2013) Influence of MRI artifacts on PET image reconstruction using MRI-based priors, IEEE Nuclear Science Symposium Conference Record, p. 1-5, doi:10.1109/NSSMIC.2013.6829346

A H Dias, C J P Gaspar, S Pintao, P Almeida, T Martins (2012) Impact of CT radiation in overall patient effective dose, for hybrid SPECT-CT imaging, EUROPEAN JOURNAL OF NUCLEAR MEDICINE AND MOLECULAR IMAGING 39, p. S420--S420

Nuno Andre Da Silva, Michaela Gaens, Uwe Pietrzyk, Pedro Almeida, Hans Herzog (2012) Bilateral filter for image derived input function in MR-BrainPET, IEEE Nuclear Science Symposium Conference Record, p. 2231-2234, doi:10.1109/NSSMIC.2012.6551508

Nuno C. Ferreira, Fabiana Rodrigues, Luis Martins, Catarina Ortigao, Francisco Caramelo, Luis Mendes, Claudia S. Ferreira, Pedro Almeida, Miguel Castelo-Branco, Joao Varela (2012) Image-based data corrections for Positron Emission Mammography, IEEE Nuclear Science Symposium Conference Record, p. 3040-3043, doi:10.1109/NSSMIC.2012.6551695

Raquel C. Conceicao, Martin O'Halloran, Ricardo M. Capote, Claudia S. Ferreira, Nuno Matela, Hugo A. Ferreira, Martin Glavin, Edward Jones, Pedro Almeida (2012) Development of breast and tumour models for simulation of novel multimodal PEM-UWB technique for detection and classification of breast tumours, IEEE Nuclear Science Symposium Conference Record, p. 2769-2772, doi:10.1109/NSSMIC.2012.6551631

L. Caldeira, C. Weirich, P. Almeida, H. Herzog (2012) Reconstruction of PET data acquired with the BrainPET using STIR, IEEE Nuclear Science Symposium Conference Record, p. 2327-2329, doi:10.1109/NSSMIC.2012.6551528

Liji Cao, Ricardo Bugalho, Nuno Matela, Mónica Martins, Pedro Almeida, Jörg Peter, João Varela (2011) List-mode maximum-likelihood reconstruction for the ClearPEM system, IEEE Nuclear Science Symposium Conference Record, p. 4171-4174, doi:10.1109/NSSMIC.2011.6153798

N. Matela, C. S. Ferreira, M. V. Martins, R. Bugalho, J. A. Neves, C. Ortigão, N. Oliveira, J. Varela, P. Almeida (2011) Assessment of DOI resolution in a fully mounted PEM scanner, IEEE Nuclear Science Symposium Conference Record, p. 3351-3353, doi:10.1109/NSSMIC.2011.6152607

M. Abrantes, P. Almeida, F. Botelho, R. Bugalho, S. Carvalho, C. S. Ferreira, N. C. Ferreira, M. V. Martins, N. Matela, J. A. Neves, C. Ortigão, A. Rodrigues, A. S. Rodrigues, M. Rolo, J. C. Silva, R. Silva, J. Varela (2011) ClearPEM scanners: Performance results and studies in preclinical environment, IEEE Nuclear Science Symposium Conference Record, p. 3291-3295, doi:10.1109/NSSMIC.2011.6152592

Dias A.H., Gaspar C.P., Pintao S., Almeida P. (2011) Improving ioflupane images: The use of a scatter correction window for added striatal/background contrast, European Journal of Nuclear Medicine and Molecular Imaging 38(SUPPL. 2), p. S257, url

R. M. Capote, P. Almeida (2011) Optimal design of fan beam collimation for pixelated breast imaging systems, IEEE Nuclear Science Symposium Conference Record, p. 3260-3262, doi:10.1109/NSSMIC.2011.6152586

L. Caldeira, J. J. Scheins, P. Almeida, J. Seabra, H. Herzog (2011) Modified median root prior reconstruction of PET/MR data acquired simultaneously with the 3TMR-BrainPET, IEEE Nuclear Science Symposium Conference Record, p. 4039-4043, doi:10.1109/NSSMIC.2011.6153768

LCCO Vieira, D C Costa, P Almeida (2010) Simulation of the basic features of the GE Millennium MG SPET gamma camera using GATE Monte Carlo simulation, EUROPEAN JOURNAL OF NUCLEAR MEDICINE AND MOLECULAR IMAGING 37, p. S490--S490

L. Caldeira, J. J. Scheins, P. Almeida, J. Seabra, H. Herzog (2010) Maximum a Posteriori Reconstruction using PRESTO and PET/MR data acquired Simultaneously with the 3TMR-BrainPET, IEEE Nuclear Science Symposium Conference Record, p. 2879-2884, doi:10.1109/NSSMIC.2010.5874322

R Capote, P Almeida (2010) A GATE simulation study of a Fan-Beam collimator for SPECT mammography, European Journal of Nuclear Medicine and Molecular Imaging 37, p. S348, url

Vieira L.C.C.O., Vaz T., Almeida P. (2010) Relation between the left ventricular function and uptake indexes of 99mTc-Tetrofosmin in the myocardial and in the lung, European Journal of Nuclear Medicine and Molecular Imaging 37, p. S498, url

C. Guerreiro, N. C. Ferreira, R. Bugalho, A. Trindade, N. Matela, M. V. Martins, L. Mendes, C. S. Ferreira, P. Almeida, J. Varela (2009) Development of component-based normalization correction for the clear-PEM system, IEEE Nuclear Science Symposium Conference Record, p. 2846-2848, doi:10.1109/NSSMIC.2009.5401637

G. Picado, Nuno Matela, N. Oliveira, P. Almeida (2009) Targeted image reconstruction in positron emission mammography, IFMBE Proceedings 25(5), p. 358-361, doi:10.1007/978-3-642-03904-1_100

L Vieira, D Faria, J Patrina, P Almeida, D C Costa (2009) Image Quality of Myocardial Perfusion Gated Studies: effect of fat chocolate, low fat chocolate and a glass of water to reduce extra-myocardial abdominal signal, European Journal of Nuclear Medicine and Molecular Imaging 36, p. S483-S483

J A Sequeira, S Carmona, A Prata, P Almeida, M Tapadinhas, A I Santos (2009) Antigranulocyte Scintigraphy and Three-Phase Bone Scintigraphy on the Management of Patients with Painful Hip and Knee Prostheses: A Retrospective Evaluation, European Journal of Nuclear Medicine and Molecular Imaging 36(2), p. S454

Liliana Lourenço Caldeira, P. Almeida, J. Seabra (2009) New evidences on automatic tumor segmentation in magnetic resonance brain images, IFMBE Proceedings 25(4), p. 1190-1193, doi:10.1007/978-3-642-03882-2_316

Gabriela G Cardoso, L C Freire, P D Almeida (2009) Preliminary classification of myocardial perfusion examinations using a short set of physiological parameters, EUROPEAN HEART JOURNAL SUPPLEMENTS 11(B), p. S58--S58

E. Albuquerque, F. G. Almeida, P. Almeida, E. Auffray, J. Barbosa, A. L. Bastos, V. Bexiga, R. Bugalho, C. Cardoso, S. Carmona, J. F. Carneiro, B. Carriço, C. S. Ferreira, N. C. Ferreira, M. Ferreira, M. Frade, F. Gonçalves, C. Guerreiro, P. Lecoq, C. Leong, P. Lousã, P. Machado, M. V. Martins, N. Matela, R. Moura, J. Neves, P. Neves, N. Oliveira, C. Ortigão, F. Piedade, J. F. Pinheiro, P. Relvas, A. Rivetti, P. Rodrigues, I. Rolo, A. I. Santos, J. Santos, M. M. Silva, S. Tavernier, I. C. Teixeira, J. P. Teixeira, J. C. Silva, R. Silva, A. Trindade, J. Varela, P. Bento (2009) Characterization of the clear-PEM breast imaging scanner performance, IEEE Nuclear Science Symposium Conference Record, p. 3487-3490, doi:10.1109/NSSMIC.2009.5401796

P. Lousã, F. G. Almeida, P. Almeida, A. L. Bastos, V. Bexiga, R. Bugalho, S. Carmona, B. Carriço, C. S. Ferreira, N. C. Ferreira, M. Ferreira, J. Godinho, F. Gonçalves, P. Lecoq, C. Leong, P. Machado, N. Matela, R. Moura, P. Neves, N. Oliveira, C. Ortigão, F. Piedade, J. F. Pinheiro, P. Relvas, A. Rivetti, P. Rodrigues, J. Sampaio, A. I. Santos, S. Tavernier, I. C. Teixeira, J. P. Teixeira, N. Pimenta, M. C. Martins, J. C. Silva, A. Trindade, J. Varela (2009) High-speed data acquisition electronics for a PEM scanner, 2009 16th IEEE-NPSS Real Time Conference - Conference Record, p. 196-200, doi:10.1109/RTC.2009.5321874

E Albuquerque, F G Almeida, P Almeida, S Augusto, V Bexiga, R Bugalho, B Carriço, C S Ferreira, N C Ferreira, M Ferreira, others (2008) Performance evaluation of a highly integrated APD/ASIC double-readout supermodule with 768 channels for clear-PEM, 2008 IEEE Nuclear Science Symposium Conference Record, p. 802-814

E. Albuquerque, F. G. Almeida, P. Almeida, E. Auffray, J. Barbosa, A. L. Bastos, V. Bexiga, R. Bugalho, S. Carmona, B. Carrico, C. S. Ferreira, N. C. Ferreira, M. Ferreira, M. Frade, J. Godinho, F. Gonçalves, C. Guerreiro, P. Lecoq, C. Leong, P. Lousa, P. Machado, M. V. Martins, N. Matela, R. Moura, P. Neves, N. Oliveira, C. Ortigao, F. Piedade, J. F. Pinheiro, P. Relvas, A. Rivetti, P. Rodrigues, I. Rolo, J. Sampaio, A. I. Santos, J. Santos, M. M. Silva, S. Tavernier, C. Teixeira, J. P. Teixeira, R. Silva, J. C. Silva, A. Trindade, J. Varela (2008) An overview of the clear-PEM breast imaging scanner, IEEE Nuclear Science Symposium Conference Record, p. 5616-5618, doi:10.1109/NSSMIC.2008.4774518

A C A Oliveira, L Freire, P Almeida (2008) Motion Detection of Head Movements During PET Neurological Studies, EUROPEAN JOURNAL OF NUCLEAR MEDICINE AND MOLECULAR IMAGING 35, p. S335--S335

L Vieira, D Faria, J Patrina, L Ribeiro, P Almeida, D C Costa (2008) Study of the influence of cycles/frame numbers in Left Ventricular Ejection Fraction in GATED-SPECT studies, EUROPEAN JOURNAL OF NUCLEAR MEDICINE AND MOLECULAR IMAGING 35, p. S393--S393

S. Brancol, S. Jan, P. Almeidal (2008) Respiratory motion modeling in small animal PET using GATE, IEEE Nuclear Science Symposium Conference Record, p. 4948-4953, doi:10.1109/NSSMIC.2008.4774350

S. Brancol, S. Jan, P. Almeidal (2008) Respiratory motion modeling in small animal PET using GATE, IEEE Nuclear Science Symposium Conference Record 35, p. 4948-4953, doi:10.1109/NSSMIC.2008.4774350

A Oliveira, L C Freire, P Almeida (2007) Monte Carlo simulations of head movements during PET brain scans, EUROPEAN JOURNAL OF NUCLEAR MEDICINE AND MOLECULAR IMAGING 34, p. S338--S338

N Matela, M V Martins, H Cordeiro, M Correia, P Rodrigues, A Trindade, N Oliveira, N C Ferreira, J Varela, P D Almeida (2006) Evaluation of spatial resolution of planar detector PET systems: different strategies show different results, EUROPEAN JOURNAL OF NUCLEAR MEDICINE AND MOLECULAR IMAGING 33, p. S89--S90

M. V. Martins, A. Trindade, N. Matela, N. Oliveira, H. Cordeiro, P. Rodrigues, N. C. Ferreira, J. Varela, P. Almeida (2006) Bayesian image reconstruction for the clear-PEM Scanner, IEEE Nuclear Science Symposium Conference Record 5, p. 2940-2943, doi:10.1109/NSSMIC.2006.356492

R Malveiro, A I Santos, P Almeida (2006) Evaluation of a new method for the routine quantification of postvoid residual bladder volume, EUROPEAN JOURNAL OF NUCLEAR MEDICINE AND MOLECULAR IMAGING 33, p. S342--S342

R Malveiro, A I Santos, P Almeida (2006) Validation of a new software package to standardize direct radionuclide cystography, EUROPEAN JOURNAL OF NUCLEAR MEDICINE AND MOLECULAR IMAGING 33, p. S123--S124

G Cardoso, L C Freire, P D Almeida (2006) Preliminary classification of myocardial perfusion exams using a neural network, EUROPEAN JOURNAL OF NUCLEAR MEDICINE AND MOLECULAR IMAGING 33, p. S217--S217

Mónica V Martins, N Matela, N. Oliveira, A. Trindade, P. Rodrigues, N. Ferreira, J. Varela, P. Almeida (2005) Clear-PEM data reconstruction using STIR, Eur J Nucl Med Mol Imag 32(S1), p. S34

N Matela, M V Martins, N Oliveira, P Almeida, A Trindade, P Rodrigues, others (2005) Comparison of different image reconstruction strategies in Clear-PEM, CIMED 05-Second International Conference on Computational Intelligence in Medicine and Healthcare, Conference Records

Monica V. Martins, Nuno Matela, Pedro Rodrigues, Andreia Trindade, Nuno Oliveira, Marta Correia, Hugo Cordeiro, Nuno C. Ferreira, João Varela, Pedro Almeida (2005) Reconstruction of clear-PEM data with STIR, IEEE Nuclear Science Symposium Conference Record 4, p. 2098-2102, doi:10.1109/NSSMIC.2005.1596748

Maria C. Abreu, João D. Aguiar, Edgar Albuquerque, Fernando G. Almeida, Pedro Almeida, Pedro Amaral, Pedro Bento, Ricardo Bugalho, Bruno Carriço, Hugo Cordeiro, Miguel Ferreira, Nuno C. Ferreira, Fernado Gonçalves, Carlos Leong, Filipe Lopes, Pedro Lousã, Mónica V. Martins, Nuno Matela, Pedro R. Mendes, Rui Moura, João Nobre, Nuno Oliveira, Catarina Ortigão, Luís Peralta, Joel Rego, Rui Ribeiro, Pedro Rodrigues, Ana I. Santos, José C. Silva, Manuel M. Silva, Isabel C. Teixeira, João P. Teixeira, Andreia Trindade, João Varela (2005) First experimental results with the clear-PEM detector, IEEE Nuclear Science Symposium Conference Record 3, p. 1662-1666, doi:10.1109/NSSMIC.2005.1596639

Andreia Trindade, Pedro Almeida, Nuno C. Ferreira, Mónica V. Martins, Nuno Matela, Nuno Oliveira, Pedro Rodrigues, João Varela (2005) Breast cancer imaging studies by Monte Carlo simulation with clear-PEM, IEEE Nuclear Science Symposium Conference Record 4, p. 2103-2107, doi:10.1109/NSSMIC.2005.1596749

L Janeiro, C Pautrot, C Comtat, F Bataille, B Helal, P Almeida (2005) Comparing NEC-based OSEM with other weighted OSEM approaches for 3D whole-body PET imaging, EUROPEAN JOURNAL OF NUCLEAR MEDICINE AND MOLECULAR IMAGING 32, p. S33--S33

M Correia, H Cordeiro, N Matela, A Trindade, M V Martins, N Oliveira, P Rodrigues, N C Ferreia, J Varela, P Almeida (2005) Evaluation of Rebinning Methods in a 2D Reconstruction Scenario with Linograms for Clear-PEM, EUROPEAN JOURNAL OF NUCLEAR MEDICINE AND MOLECULAR IMAGING 32, p. S256--S256

N. Matela, M. V. Martins, P. Rodrigues, A. Trindade, N. Oliveira, L. Peralta, N. C. Ferreira, J. Varela, P. D. Almeida (2004) System matrix calculation for clear-PEM using ART and linograms, IEEE Nuclear Science Symposium Conference Record 4, p. 2601-2604, doi:10.1109/nssmic.2004.1462785

Ana I. Santos, Pedro Almeida, Monica V. Martins, Nuno Matela, Nuno Oliveira, Nuno C. Ferreira, João D. Aguiar, Fernando G. Almeida, Filipe Lopes, José Sampaio, Pedro Bento, Fernando Gonçalves, Carlos Leong, Pedro Lousã, Luís Silva, Isabel C. Teixeira, João P. Teixeira, Maria C. Abreu, Bruno Carriço, Pedro R. Mendes, Rui Pereira, Patrick Sousa, Miguel Ferreira, Rui Moura, Catarina Ortigão, Luís Peralta, Rui Ribeiro, P. Rodrigues, José C. Silva, Andreia Trindade, João Varela (2004) Design and evaluation of the clear-PEM detector for positron emission mammography, IEEE Nuclear Science Symposium Conference Record 6, p. 3805-3809, doi:10.1109/nssmic.2004.1466709

A Gouveia, L Freire, P Almeida (2004) Optimizing multimodality MRI-PET registration using mutual information, EUROPEAN JOURNAL OF NUCLEAR MEDICINE AND MOLECULAR IMAGING 31, p. S236--S237

Andreia Trindade, Pedro Almeida, Filipa Balau, Nuno Ferreira, Susana Fetal, Francisco Fraga, Mónica Martins, Nuno Matela, Pedro Mendes, Rui Moura, Catarina Ortigão, Luis Peralta, Rui Ribeiro, Pedro Rodrigues, João Varela (2003) Clear-PEM: Monte Carlo performance and image reconstruction studies, IEEE Nuclear Science Symposium Conference Record 3, p. 1918-1922, doi:10.1109/nssmic.2003.1352254

L. Janeiro, C. Comtat, C. Lartizien, P. E. Kinahan, M. Defrise, C. Michel, R. Trébossen, P. Almeida (2003) A comparison between FORE+NECOSEM and NECOSEM 3D for whole-body PET imaging, IEEE Nuclear Science Symposium Conference Record 4, p. 2831-2835, doi:10.1109/nssmic.2003.1352474

N Matela, M Martins, P Rodrigues, A Trindade, N Oliveira, L Peralta, N Ferreira (2003) ART with Linograms for PEM, Proc. 7th Portuguese Conference on Biomedical Engineering, p. 3-6

Luis Janeiro, Claude Comtat, C Lartizien, P E Kinahan, Michel Defrise, Christian Michel, Regine Trebossen, Pedro Almeida (2002) NEC-scaling applied to FORE+ OSEM, 2002 IEEE Nuclear Science Symposium Conference Record 2, p. 717-721

J Sequeira, D Passos, P A Santos, S Carmona, M Filipe, M J Carapinha, B Abrantes, A Quintal, P Almeida, J Portugal, others (2001) Clinical efficacy of a simplified method to determine the therapeutic radioactivity of i-131 for hyperthyroidism, EUROPEAN JOURNAL OF NUCLEAR MEDICINE 28(8), p. 1092

P A Santos, P Almeida, M Filipe, J Sequeira, B Abrantes, A I Santos (2000) The effect of using Tc-99m instead of I-131 on the calculation of therapeutic I-131 doses used in hyperthyrodism., EUROPEAN JOURNAL OF NUCLEAR MEDICINE 27(1), p. S102--S102

P Almeida, M J Ribeiro, B Bendriem, P Hugonnard, P Grangeat, B Maziere, R Trebossen (1999) Absolute quantification of radioactive concentration in human dopaminergic structures by SPET: A study using an anthropomorphic head phantom, EUROPEAN JOURNAL OF NUCLEAR MEDICINE 26(9), p. 1185

M J Ribeiro, P Almeida, D Strul, N Ferreira, C Loc'h, V Brulon, R Trebossen, B Bendriem, B Maziere (1999) Influence of the positron range in PET imaging: Comparison of bromine-76 and fluorine-18., European Journal Of Nuclear Medicine 26(9), p. 1027

P Almeida, M J Ribeiro, M Boulaender, C Loc'h, P Hugonnard, P Grangeat, B Bendriem (1998) Absolute quantitation of I-123 labelled epidepride concentration in baboon brain using SPECT., JOURNAL OF NUCLEAR MEDICINE 39(5), p. 168P--168P

Olivier de Dreuille, Bernard Bendriem, Cyril Riddell, Pedro Almeida, Gerard Wastiaux, Heric Valette, Vincent Brulon, Jean Francois Toussaint, Pascal Merlet, Michel Bourguignon (1996) New dynamic myocardial phantom for evaluation of SPECT and PET quantitation in systolic and diastolic conditions, IEEE Nuclear Science Symposium & Medical Imaging Conference 2, p. 1439-1443, doi:10.1109/nssmic.1996.591718

M Pélégrini, O DeDreuille, H Benali, B Bendriem, P Almeida, R Trebossen, I Buvat, R DiPaola (1996) Fast quantitative measurement of attenuation map in SPECT using statistic-based sinogram regularization., JOURNAL OF NUCLEAR MEDICINE 37(5), p. 982