ArticleIndian journal of nuclear medicine : IJNM : the official journal of the Society of Nuclear Medicine, India
Impact of Collimator Material on Spatial Resolution and Sensitivity in Semiconductor-Based Imaging Systems: A Monte Carlo Evaluation.
Article in Indian journal of nuclear medicine : IJNM : the official journal of the Society of Nuclear Medicine, India. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
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.
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