Youcef El-Mohri

Summary

Affiliation: University of Michigan
Country: USA

Publications

  1. ncbi An Active Matrix Flat Panel Dosimeter (AMFPD) for in-phantom dosimetric measurements
    Jean M Moran
    Department of Radiation Oncology, University of Michigan, Ann Arbor, Michigan 48109 0010, USA
    Med Phys 32:466-72. 2005
  2. ncbi Monte Carlo investigations of megavoltage cone-beam CT using thick, segmented scintillating detectors for soft tissue visualization
    Yi Wang
    Department of Radiation Oncology, University of Michigan, Ann Arbor, Michigan 48109, USA
    Med Phys 35:145-58. 2008
  3. ncbi Relative dosimetry using active matrix flat-panel imager (AMFPI) technology
    Y El-Mohri
    Department of Radiation Oncology, University of Michigan Medical Center, Ann Arbor 48109, USA
    Med Phys 26:1530-41. 1999
  4. ncbi Active pixel imagers incorporating pixel-level amplifiers based on polycrystalline-silicon thin-film transistors
    Youcef El-Mohri
    Department of Radiation Oncology, University of Michigan Medical Center, Ann Arbor, Michigan 48109 USA
    Med Phys 36:3340-55. 2009
  5. ncbi Low-dose megavoltage cone-beam CT imaging using thick, segmented scintillators
    Youcef El-Mohri
    Department of Radiation Oncology, University of Michigan, Ann Arbor, MI 48109, USA
    Phys Med Biol 56:1509-27. 2011
  6. ncbi Performance of a high fill factor, indirect detection prototype flat-panel imager for mammography
    Youcef El-Mohri
    Department of Radiation Oncology, University of Michigan Medical Center, Ann Arbor Michigan 48109, USA
    Med Phys 34:315-27. 2007
  7. ncbi Determination of the detective quantum efficiency of a prototype, megavoltage indirect detection, active matrix flat-panel imager
    Y El-Mohri
    Department of Radiation Oncology, University of Michigan Medical Center, Ann Arbor 48109, USA
    Med Phys 28:2538-50. 2001
  8. ncbi A quantitative investigation of additive noise reduction for active matrix flat-panel imagers using compensation lines
    Y El-Mohri
    Department of Radiation Oncology, University of Michigan Medical Center, Ann Arbor 48109, USA
    Med Phys 27:1855-64. 2000
  9. ncbi Segmented crystalline scintillators: an initial investigation of high quantum efficiency detectors for megavoltage x-ray imaging
    Amit Sawant
    Department of Radiation Oncology, University of Michigan, Ann Arbor, Michigan 48105, USA
    Med Phys 32:3067-83. 2005
  10. ncbi Segmented crystalline scintillators: empirical and theoretical investigation of a high quantum efficiency EPID based on an initial engineering prototype CsI(TI) detector
    Amit Sawant
    Department of Radiation Oncology, University of Michigan, Ann Arbor, Michigan 48103, USA
    Med Phys 33:1053-66. 2006

Detail Information

Publications23

  1. ncbi An Active Matrix Flat Panel Dosimeter (AMFPD) for in-phantom dosimetric measurements
    Jean M Moran
    Department of Radiation Oncology, University of Michigan, Ann Arbor, Michigan 48109 0010, USA
    Med Phys 32:466-72. 2005
    ..The device also compares well to film for 2-D planar dose distributions. It is expected that the AMFPD system will be useful for beam commissioning, algorithm verification test data, and routine IMRT quality assurance dosimetry...
  2. ncbi Monte Carlo investigations of megavoltage cone-beam CT using thick, segmented scintillating detectors for soft tissue visualization
    Yi Wang
    Department of Radiation Oncology, University of Michigan, Ann Arbor, Michigan 48109, USA
    Med Phys 35:145-58. 2008
    ....
  3. ncbi Relative dosimetry using active matrix flat-panel imager (AMFPI) technology
    Y El-Mohri
    Department of Radiation Oncology, University of Michigan Medical Center, Ann Arbor 48109, USA
    Med Phys 26:1530-41. 1999
    ..Finally, excellent long-term stability in pixel response, extending over a 2 month period, was observed...
  4. ncbi Active pixel imagers incorporating pixel-level amplifiers based on polycrystalline-silicon thin-film transistors
    Youcef El-Mohri
    Department of Radiation Oncology, University of Michigan Medical Center, Ann Arbor, Michigan 48109 USA
    Med Phys 36:3340-55. 2009
    ..However, faster readout rates, coupled with implementation of multiple sampling protocols allowed by the nondestructive nature of pixel readout, resulted in a significantly lower noise level of approximately 560 e (rms) for PSI-3...
  5. ncbi Low-dose megavoltage cone-beam CT imaging using thick, segmented scintillators
    Youcef El-Mohri
    Department of Radiation Oncology, University of Michigan, Ann Arbor, MI 48109, USA
    Phys Med Biol 56:1509-27. 2011
    ..76%. Results of contrast, noise and contrast-to-noise ratio are presented as a function of dose and compared to those from a conventional MV AMFPI...
  6. ncbi Performance of a high fill factor, indirect detection prototype flat-panel imager for mammography
    Youcef El-Mohri
    Department of Radiation Oncology, University of Michigan Medical Center, Ann Arbor Michigan 48109, USA
    Med Phys 34:315-27. 2007
    ..Finally, such calculations were used to predict potential DQE performance for hypothetical 50 microm pixel pitch imagers, employing similar continuous photodiode design and realistic inputs derived from the empirical measurements...
  7. ncbi Determination of the detective quantum efficiency of a prototype, megavoltage indirect detection, active matrix flat-panel imager
    Y El-Mohri
    Department of Radiation Oncology, University of Michigan Medical Center, Ann Arbor 48109, USA
    Med Phys 28:2538-50. 2001
    ..For thinner phosphor screens, the DQE is lower due to their lower detection efficiencies. Finally, for the Fast B screen, good agreement between calculated and measured DQE was observed...
  8. ncbi A quantitative investigation of additive noise reduction for active matrix flat-panel imagers using compensation lines
    Y El-Mohri
    Department of Radiation Oncology, University of Michigan Medical Center, Ann Arbor 48109, USA
    Med Phys 27:1855-64. 2000
    ..Finally, a position-dependent correction based on compensation lines on both sides of the array was found to be effective when the magnitude of the correlated noise varied linearly across the array...
  9. ncbi Segmented crystalline scintillators: an initial investigation of high quantum efficiency detectors for megavoltage x-ray imaging
    Amit Sawant
    Department of Radiation Oncology, University of Michigan, Ann Arbor, Michigan 48105, USA
    Med Phys 32:3067-83. 2005
    ....
  10. ncbi Segmented crystalline scintillators: empirical and theoretical investigation of a high quantum efficiency EPID based on an initial engineering prototype CsI(TI) detector
    Amit Sawant
    Department of Radiation Oncology, University of Michigan, Ann Arbor, Michigan 48103, USA
    Med Phys 33:1053-66. 2006
    ....
  11. ncbi Systematic investigation of the signal properties of polycrystalline HgI2 detectors under mammographic, radiographic, fluoroscopic and radiotherapy irradiation conditions
    Zhong Su
    Department of Radiation Oncology, University of Michigan, 519 W. William St, Argus Building 1, Ann Arbor, MI 48103-4943, USA
    Phys Med Biol 50:2907-28. 2005
    ....
  12. ncbi Performance evaluation of polycrystalline HgI2 photoconductors for radiation therapy imaging
    Qihua Zhao
    Department of Radiation Oncology, University of Michigan, Ann Arbor, Michigan 48019, USA
    Med Phys 37:2738-48. 2010
    ....
  13. ncbi System performance of a prototype flat-panel imager operated under mammographic conditions
    Kyung Wook Jee
    Department of Radiation Oncology, University of Michigan Medical Center, Ann Arbor, Michigan 48109, USA
    Med Phys 30:1874-90. 2003
    ..In this study, we provide an example of how cascaded systems modeling can be used to identify factors limiting system performance and to examine trade-offs between factors toward the goal of maximizing performance...
  14. ncbi Segmented phosphors: MEMS-based high quantum efficiency detectors for megavoltage x-ray imaging
    Amit Sawant
    Department of Radiation Oncology, University of Michigan, Ann Arbor, Michigan 48103, USA
    Med Phys 32:553-65. 2005
    ....
  15. ncbi Investigation of the signal behavior at diagnostic energies of prototype, direct detection, active matrix, flat-panel imagers incorporating polycrystalline HgI2
    Hong Du
    Department of Radiation Oncology, University of Michigan Medical Center, Ann Arbor, Michigan 48109, USA
    Phys Med Biol 53:1325-51. 2008
    ..While the results of the current study are promising, further development will be required to realize prototypes exhibiting the characteristics necessary to allow practical implementation of this approach...
  16. ncbi An investigation of signal performance enhancements achieved through innovative pixel design across several generations of indirect detection, active matrix, flat-panel arrays
    Larry E Antonuk
    Department of Radiation Oncology, University of Michigan, Ann Arbor, Michigan 48109, USA
    Med Phys 36:3322-39. 2009
    ....
  17. ncbi High-DQE EPIDs based on thick, segmented BGO and CsI:Tl scintillators: performance evaluation at extremely low dose
    Yi Wang
    Department of Radiation Oncology, University of Michigan, Ann Arbor Michigan 48109, USA
    Med Phys 36:5707-18. 2009
    ..In order to significantly improve DQE, the authors are investigating thick, segmented scintillators, consisting of 2D matrices of scintillating crystals separated by septal walls...
  18. ncbi Countering beam divergence effects with focused segmented scintillators for high DQE megavoltage active matrix imagers
    Langechuan Liu
    Department of Radiation Oncology, University of Michigan, Ann Arbor, MI 48109, USA
    Phys Med Biol 57:5343-58. 2012
    ....
  19. ncbi Monte Carlo investigations of the effect of beam divergence on thick, segmented crystalline scintillators for radiotherapy imaging
    Yi Wang
    Department of Radiation Oncology, University of Michigan, Ann Arbor, MI 48109, USA
    Phys Med Biol 55:3659-73. 2010
    ..For thicker scintillators, the area that is relatively unaffected is significantly reduced, requiring a focused scintillator geometry in order to preserve spatial resolution, and thus DQE...
  20. ncbi A Monte Carlo investigation of Swank noise for thick, segmented, crystalline scintillators for radiotherapy imaging
    Yi Wang
    Department of Radiation Oncology, University of Michigan, Ann Arbor, Michigan 48109, USA
    Med Phys 36:3227-38. 2009
    ....
  21. ncbi Performance of a direct-detection active matrix flat panel dosimeter (AMFPD) for IMRT measurements
    Yu Chen
    Department of Radiation Oncology, University of Michigan, Ann Arbor, Michigan 48109, USA
    Med Phys 34:4911-22. 2007
    ....
  22. ncbi Slit design for efficient and accurate MTF measurement at megavoltage x-ray energies
    Amit Sawant
    Department of Radiation Oncology, University of Michigan, Ann Arbor, Michigan 48103, USA
    Med Phys 34:1535-45. 2007
    ..Furthermore, the theoretical results suggest that it may be possible to achieve even further reductions in slit thickness without compromising measurement accuracy...
  23. ncbi Development of active matrix flat panel imagers incorporating thin layers of polycrystalline HgI(2) for mammographic x-ray imaging
    Hao Jiang
    Department of Radiation Oncology, University of Michigan, Ann Arbor, MI 48109, USA
    Phys Med Biol 58:703-14. 2013
    ..1 pA mm(-2)) and good spatial resolution, largely limited by the size of the pixel pitch, were observed. For one prototype, a detective quantum efficiency of ∼70% was observed at an x-ray exposure of ∼0.5 mR at 26 kVp...