Related Experiment Video
Updated: Jan 10, 2026
Neutron Radiography and Computed Tomography of Biological Systems at the Oak Ridge National Laboratory's High Flux Isotope Reactor
Published on: May 7, 2021
Impact of Collimator Material on Spatial Resolution and Sensitivity in Semiconductor-Based Imaging Systems: A Monte
1Department of Physics, Faculty of Science, New Valley University, El-Kharja, Egypt.
Background:
In gamma cameras, there is significant interest in developing novel devices that employ a semiconductor detector. The most significant quality control parameter for assessing the performance of gamma cameras with parallel-hole collimating is the spatial resolution. Acceptable spatial resolution is due to the high absorption and stopping power of collimator materials, while they may lead to a reduction in sensitivity in the same condition. Thus, a comparison between sensitivity and spatial resolution is crucial in nuclear medicine imaging devices.
Aims And Objectives:
This work aimed to compare spatial resolutions using pixellated parallel-hole collimators with lead and tungsten at equal sensitivity to assess the camera's performance.
Materials And Methods:
The overall imaging system was simulated using a Geant4 Application for Tomographic Emission simulation tool. Furthermore, source-to-detector distance effects on image performance and spatial resolution were evaluated using a simulated hot-rod phantom. The full width at half maximum (FWHM) and the full width at tenth maximum (FWTM) stand for the spatial resolution.
Results:
The averages of measured FWHM using lead at equivalent sensitivities were 3.28% greater than that of tungsten. Furthermore, the averages of measured FWTM of lead at equivalent sensitivities were 7.99% greater than those obtained with tungsten.
Conclusion:
The results demonstrated that at a specific sensitivity, lead provides better spatial resolution than tungsten.
