Research Topics
| H ZaidiSummaryAffiliation: University Hospital Country: Switzerland Publications
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Detail Information
Publications
Assessment of errors caused by X-ray scatter and use of contrast medium when using CT-based attenuation correction in PETMohammad Reza Ay
Division of Nuclear Medicine, Geneva University Hospital 1211 Geneva 4, Switzerland
Eur J Nucl Med Mol Imaging 33:1301-13. 2006..Likewise, contrast-enhanced CT images may create considerable artefacts during CTAC in regions containing high concentrations of contrast medium...- Fully automated segmentation of oncological PET volumes using a combined multiscale and statistical modelDavid W G Montgomery
School of Electronics, Electrical Engineering and Computer Science, ECIT The Queen s University of Belfast, Belfast, Northern Ireland
Med Phys 34:722-36. 2007..The use of this technique to estimate tumor volumes for assessment of response to therapy and to delineate treatment volumes for the purpose of combined PET/CT-based radiation therapy treatment planning is also discussed... - Point/counterpoint. Simultaneous PET/MR will replace PET/CT as the molecular multimodality imaging platform of choiceHabib Zaidi
Division of Nuclear Medicine, Geneva University Hospital, CH-1211 Geneva 4, Switzerland
Med Phys 34:1525-8. 2007 
Comparative methods for PET image segmentation in pharyngolaryngeal squamous cell carcinomaHabib Zaidi
Division of Nuclear Medicine and Molecular Imaging, Geneva University Hospital, CH 1211 Geneva, Switzerland
Eur J Nucl Med Mol Imaging 39:881-91. 2012..In this study, we assessed the performance of four categories of ¹⁸F-FDG PET image segmentation techniques in pharyngolaryngeal squamous cell carcinoma using clinical studies where the surgical specimen served as the benchmark...- Breathing adapted radiotherapy: a 4D gating software for lung cancerNicolas Peguret
Department of Radiation Oncology, University Hospital, Geneva, Switzerland
Radiat Oncol 6:78. 2011..The optimal respiratory phase for beam-on may be assessed with a respiratory phase optimizer (RPO), a 4D image processing software developed with this purpose... - [(18)F]Fluoroethyltyrosine- positron emission tomography-guided radiotherapy for high-grade gliomaDamien C Weber
Department of Radiation Oncology, Geneva University Hospital, Geneva, Switzerland
Radiat Oncol 3:44. 2008.... - RapidArc, intensity modulated photon and proton techniques for recurrent prostate cancer in previously irradiated patients: a treatment planning comparison studyDamien C Weber
Department of Radiation Oncology, University Hospital of Geneva, Geneva, Switzerland
Radiat Oncol 4:34. 2009..A study was performed comparing volumetric modulated arcs (RA) and intensity modulation (with photons, IMRT, or protons, IMPT) radiation therapy (RT) for patients with recurrent prostate cancer after RT... - Reduction of artefacts caused by hip implants in CT-based attenuation-corrected PET images using 2-D interpolation of a virtual sinogram on an irregular gridMehrsima Abdoli
Department of Nuclear Medicine and Molecular Imaging, University Medical Center Groningen, University of Groningen, 9700 RB Groningen, The Netherlands
Eur J Nucl Med Mol Imaging 38:2257-68. 2011..Since this degrades the diagnostic quality of the images, metal artefact reduction (MAR) prior to attenuation correction is required... - Magnetic resonance imaging-guided attenuation and scatter corrections in three-dimensional brain positron emission tomographyHabib Zaidi
Division of Nuclear Medicine, Geneva University Hospital, CH 1211 Geneva 4, Switzerland
Med Phys 30:937-48. 2003.... 
The clinical role of fusion imaging using PET, CT, and MR imagingHabib Zaidi
Division of Nuclear Medicine, Geneva University Hospital, CH 1211 Geneva, Switzerland
Magn Reson Imaging Clin N Am 18:133-49. 2010..This article discusses recent advances in clinical multimodality imaging, the role of correlative fusion imaging in a clinical setting, and future opportunities and challenges facing the adoption of multimodality imaging...- Recent developments and future trends in nuclear medicine instrumentationHabib Zaidi
Division of Nuclear Medicine, Geneva University Hospital, CH 1211 Geneva 4, Switzerland
Z Med Phys 16:5-17. 2006..This paper briefly summarizes state-of-the art developments in nuclear medicine instrumentation. Future prospects will also be discussed... - Comparative assessment of statistical brain MR image segmentation algorithms and their impact on partial volume correction in PETHabib Zaidi
Division of Nuclear Medicine, Geneva University Hospital, CH 1211 Geneva 4, Switzerland
Neuroimage 32:1591-607. 2006..The partial volume corrected activities in some regions of the brain show quite large relative differences when performing paired analysis on 2 algorithms, implying a careful choice of the segmentation algorithm for GTM-based PVC... - Current status and new horizons in Monte Carlo simulation of X-ray CT scannersHabib Zaidi
Division of Nuclear Medicine, Geneva University Hospital, 1211 Geneva 4, Switzerland
Med Biol Eng Comput 45:809-17. 2007..It should be noted that due to limited space, the references contained herein are for illustrative purposes and are not inclusive; no implication that those chosen are better than others not mentioned is intended... - Strategies for attenuation compensation in neurological PET studiesHabib Zaidi
Division of Nuclear Medicine, Geneva University Hospital, CH 1211 Geneva 4, Switzerland
Neuroimage 34:518-41. 2007..Future prospects, research trends and challenges are identified and directions for future research are discussed... - PET-guided delineation of radiation therapy treatment volumes: a survey of image segmentation techniquesHabib Zaidi
Geneva University Hospital, Geneva 4, Switzerland
Eur J Nucl Med Mol Imaging 37:2165-87. 2010..Future opportunities and the current challenges facing the adoption of PET-guided delineation of target volumes and its role in basic and clinical research are also addressed... - Computational anthropomorphic models of the human anatomy: the path to realistic Monte Carlo modeling in radiological sciencesHabib Zaidi
Division of Nuclear Medicine, Geneva University Hospital, CH 1211 Geneva 4, Switzerland
Annu Rev Biomed Eng 9:471-500. 2007.... - Design and performance evaluation of a whole-body Ingenuity TF PET-MRI systemH Zaidi
Division of Nuclear Medicine and Molecular Imaging, Geneva University Hospital, CH 1211 Geneva, Switzerland
Phys Med Biol 56:3091-106. 2011..The performance of the PET subsystem was comparable to the GEMINI TF PET-CT system using phantom and patient studies. It is conceived that advantages of hybrid PET-MRI will become more evident in the near future... - An outlook on future design of hybrid PET/MRI systemsHabib Zaidi
Division of Nuclear Medicine and Molecular Imaging, Geneva University Hospital, CH 1211 Geneva, Switzerland
Med Phys 38:5667-89. 2011..This paper briefly summarizes state-of-the-art developments and latest advances in dedicated hybrid PET/MRI instrumentation. Future prospects and potential clinical applications of this technology will also be discussed... - Determination of the attenuation map in emission tomographyHabib Zaidi
Division of Nuclear Medicine, Geneva University Hospital, Geneva, Switzerland
J Nucl Med 44:291-315. 2003..This article presents the physical and methodologic basis of attenuation correction and summarizes recent developments in algorithms used to compute the attenuation map in ECT. Other potential applications are also discussed... - Scatter modelling and correction strategies in fully 3-D PETH Zaidi
Division of Nuclear Medicine, Geneva University Hospital, Geneva, Switzerland
Nucl Med Commun 22:1181-4. 2001..Improved quantification of PET images remains an area of considerable research interest and several research groups are concentrating their efforts towards the development of more accurate scatter modelling and correction algorithms... - Molecular PET/CT imaging-guided radiation therapy treatment planningHabib Zaidi
Division of Nuclear Medicine, Geneva University Hospital, CH 1211 Geneva 4, Switzerland
Acad Radiol 16:1108-33. 2009..There is still much more work to be done and many of the techniques reviewed are themselves not yet widely implemented in clinical settings... - Attenuation compensation in cerebral 3D PET: effect of the attenuation map on absolute and relative quantitationHabib Zaidi
Division of Nuclear Medicine, Geneva University Hospital, 1211 Geneva 4, Switzerland
Eur J Nucl Med Mol Imaging 31:52-63. 2004..Transmission-less attenuation correction results in a reduced radiation dose and makes a dramatic difference in acquisition time, allowing increased patient throughput... - Scatter modelling and compensation in emission tomographyHabib Zaidi
Division of Nuclear Medicine, Geneva University Hospital, 1211 Geneva, Switzerland
Eur J Nucl Med Mol Imaging 31:761-82. 2004..This, in turn, stresses the need for implementation of more accurate algorithms in software supplied by scanner manufacturers, although the choice of a general-purpose algorithm or algorithms may be difficult... - Correction for image degrading factors is essential for accurate quantification of brain function using PET. For the propositionHabib Zaidi
Geneva University Hospital, Division of Nuclear Medicine, CH-1211 Geneva, Switzerland
Med Phys 31:423-5. 2004 - Fuzzy clustering-based segmented attenuation correction in whole-body PET imagingH Zaidi
Division of Nuclear Medicine, Geneva University Hospital, Switzerland
Phys Med Biol 47:1143-60. 2002..Finally, the potential of the FCM algorithm as a segmentation method and its limitations as well as other prospective applications of the technique are discussed... - Relevance of accurate Monte Carlo modeling in nuclear medical imagingH Zaidi
Division of Nuclear Medicine, Geneva University Hospital, Switzerland
Med Phys 26:574-608. 1999..Current and future trends in the field are also discussed... - 18F-fluorocholine PET-guided target volume delineation techniques for partial prostate re-irradiation in local recurrent prostate cancerHui Wang
Service of Radiation Oncology, Geneva University Hospital, Geneva, Switzerland
Radiother Oncol 93:220-5. 2009..We evaluate the contribution of (18)F-choline PET/CT in the delineation of gross tumour volume (GTV) in local recurrent prostate cancer after initial irradiation using various PET image segmentation techniques... - Atlas-guided non-uniform attenuation correction in cerebral 3D PET imagingMarie-Louise Montandon
Division of Nuclear Medicine, Geneva University Hospital, CH-1211 Geneva 4, Switzerland
Neuroimage 25:278-86. 2005.... - An object-oriented Monte Carlo simulator for 3D cylindrical positron tomographsH Zaidi
Division of Nuclear Medicine, Geneva University Hospital, Switzerland
Comput Methods Programs Biomed 58:133-45. 1999..Scatter fractions determined from these studies are in good agreement with measured scatter fractions published in the literature. Limitations and future prospects are discussed... - Development and validation of MCNP4C-based Monte Carlo simulator for fan- and cone-beam x-ray CTMohammad Reza Ay
Division of Nuclear Medicine, Geneva University Hospital, CH-1211 Geneva 4, Switzerland
Phys Med Biol 50:4863-85. 2005.... - Computed tomography-based attenuation correction in neurological positron emission tomography: evaluation of the effect of the X-ray tube voltage on quantitative analysisMohammad Reza Ay
Division of Nuclear Medicine, Geneva University Hospital, Geneva, Switzerland
Nucl Med Commun 27:339-46. 2006.... - A novel fuzzy C-means algorithm for unsupervised heterogeneous tumor quantification in PETSaoussen Belhassen
Division of Nuclear Medicine, Geneva University Hospital, CH 1211 Geneva, Switzerland
Med Phys 37:1309-24. 2010..However, the algorithm is sensitive to both noise and intensity heterogeneity since it does not take into account spatial contextual information... - Assessment of the impact of model-based scatter correction on [18F]-FDG 3D brain PET in healthy subjects using statistical parametric mappingMarie-Louise Montandon
Division of Nuclear Medicine, Geneva University Hospital, CH-1211 Geneva 4, Switzerland
Neuroimage 20:1848-56. 2003..This needs to be considered when interpreting [18F]-FDG 3D brain PET images after applying SC... - Feasibility of a novel design of high resolution parallax-free Compton enhanced PET scanner dedicated to brain researchA Braem
CERN, PH Department, CH-1211 Geneva, Switzerland
Phys Med Biol 49:2547-62. 2004..Better or similar performance parameters were obtained compared to other known designs at lower fabrication cost. The axial geometrical concept also seems to be promising for applications such as positron emission mammography... - Three-phase 18F-fluorocholine PET/CT in the evaluation of prostate cancer recurrenceCh Steiner
Service of Nuclear Medicine, Hospital Care System Research and Analysis Group, University Hospital of Geneva, Rue Micheli du Crest 24, 1211 Geneva 14, Switzerland
Nuklearmedizin 48:1-9; quiz N2-3. 2009..Contribution of 3-phase 18F-fluorocholine PET/CT in suspected prostate cancer recurrence at early rise of PSA... - Positron-emission tomography imaging of early events after transplantation of islets of LangerhansChristian Toso
Cell Isolation and Transplantation Center, Department of Surgery, Geneva University Hospitals, Geneva, Switzerland
Transplantation 79:353-5. 2005..Ex vivo labeling of islets and imaging of posttransplant early events were feasible. Islets engrafted exclusively in the liver. No islet loss could be demonstrated 6 hours after transplantation... - 18F-choline and/or 11C-acetate positron emission tomography: detection of residual or progressive subclinical disease at very low prostate-specific antigen values (<1 ng/mL) after radical prostatectomyHansjorg Vees
Service of Radiation Oncology, University Hospital, Geneva, Switzerland
BJU Int 99:1415-20. 2007.... - (11)C-acetate PET in the early evaluation of prostate cancer recurrenceSusanne Albrecht
Service of Nuclear Medicine, University Hospital of Geneva, Rue Micheli du Crest 24, 1211, Geneva 14, Switzerland
Eur J Nucl Med Mol Imaging 34:185-96. 2007..The first aim of the study was to investigate the diagnostic potential of (11)C-acetate PET in the early detection of prostate cancer recurrence. A second aim was the evaluation of early and late PET in this context... - Assessment of 18F-FDG-leukocyte imaging to monitor rejection after pancreatic islet transplantationC Toso
Cell Isolation and Transplantation Center, Clinic for Visceral and Transplant Surgery, University Hospital, Geneva, Switzerland
Transplant Proc 38:3033-4. 2006..We sought to investigate the feasibility of 18F-FDG-leukocyte imaging to detect islet rejection... - Combined evaluation of myocardial perfusion and coronary morphology in the identification of subclinical CAD. Radiation exposure of 13N-ammonia PET/CTG Vincenti
Department of Internal Medicine, Cardiovascular Center, 6th Floor, Nuclear Cardiology, University Hospitals of Geneva, Rue Gabrielle Perret Gentil 4, 1211 Geneva, Switzerland
Nuklearmedizin 49:173-82. 2010.... - Quantitative analysis of template-based attenuation compensation in 3D brain PETMarie Louise Montandon
Division of Nuclear Medicine, Geneva University Hospital, CH 1211 Geneva 4, Switzerland
Comput Med Imaging Graph 31:28-38. 2007..These encouraging results provide further confidence in the adequacy of the proposed approach demonstrating its performance particularly for research studies or diagnostic applications involving quantification... - Assessment of various strategies for 18F-FET PET-guided delineation of target volumes in high-grade glioma patientsHansjorg Vees
Service of Nuclear Medicine, Geneva University Hospital, CH 1211, Geneva, Switzerland
Eur J Nucl Med Mol Imaging 36:182-93. 2009.... - Performance evaluation of the FLEX triumph X-PET scanner using the national electrical manufacturers association NU-4 standardsRameshwar Prasad
Division of Nuclear Medicine, Geneva University Hospital, Geneva, Switzerland
J Nucl Med 51:1608-15. 2010..The purpose of this work was to evaluate the performance characteristics of the preclinical X-PET subsystem of the FLEX Triumph PET/CT scanner based on the NU 4-2008 standards of the National Electrical Manufacturers Association (NEMA)... - Which attenuation coefficient to use in combined attenuation and scatter corrections for quantitative brain SPET?Habib Zaidi
Eur J Nucl Med Mol Imaging 29:967-9; author reply 969-70. 2002 - Impact of metal artefacts due to EEG electrodes in brain PET/CT imagingCatherine Lemmens
Department of Nuclear Medicine and Medical Imaging Center, University Hospital Gasthuisberg and Katholieke Universiteit Leuven, Leuven, Belgium
Phys Med Biol 53:4417-29. 2008..When quantification is performed, the bias becomes an issue especially when comparing brain images with and without EEG monitoring... - PET versus SPECT: strengths, limitations and challengesArman Rahmim
Department of Radiology, Johns Hopkins Medical Institutions, Baltimore, Maryland, USA
Nucl Med Commun 29:193-207. 2008..Both technologies are poised to advance molecular imaging and have a direct impact on clinical and research practice to influence the future of molecular medicine... - Is MR-guided attenuation correction a viable option for dual-modality PET/MR imaging?Habib Zaidi
Radiology 244:639-42. 2007 - Is radionuclide transmission scanning obsolete for dual-modality PET/CT systems?Habib Zaidi
Eur J Nucl Med Mol Imaging 34:815-8. 2007 - Novel quantitative techniques for assessing regional and global function and structure based on modern imaging modalities: implications for normal variation, aging and diseased statesSandip Basu
Department of Radiology, Division of Nuclear Medicine, University of Pennsylvania School of Medicine, Philadelphia, PA 19104 4283, USA
Semin Nucl Med 37:223-39. 2007..Simplified quantitative techniques based on these concepts are described, but should be validated against the kinetic models to test their role as practical tools... - Functional segmentation of dynamic nuclear images by cross-psi B-energy operatorAbdel Ouahab Boudraa
IRENav, Ecole Navale, Lanvéoc Poulmic, BP600, 29240 Brest Armées, France
Comput Methods Programs Biomed 84:146-52. 2006..Results of a normal subject and four patients with abnormal ventricular contraction patterns are presented to highlight the suitability of this operator for studying non-stationary TAC series... - Medical image segmentation: quo vadisHabib Zaidi
Comput Methods Programs Biomed 84:63-5. 2006