Monte Carlo-Based Assessment of the Trade-Off Between Spatial Resolution, Field-Of-View and Scattered Radiation in the Variable Resolution X-Ray Ct Scanner

Monte Carlo-Based Assessment of the Trade-Off Between Spatial Resolution, Field-Of-View and Scattered Radiation in the Variable Resolution X-Ray Ct Scanner Publisher Pubmed

Arabi H¹ ; Kamali Asl AR² ; Ay MR^{3, 4} ; Zaidi H^{1, 5, 6}

Show Affiliations

1. Division of Nuclear Medicine and Molecular Imaging, Geneva University Hospital, Geneva, CH-1211, Switzerland
2. Department of Radiation Medicine, Shahid Beheshti University, Tehran, 1983963113, Iran
3. Research Centre for Molecular and Cellular Imaging, Tehran University of Medical Sciences, Tehran, Iran
4. Department of Medical Physics and Biomedical Engineering, Tehran University of Medical Sciences, Tehran, Iran
5. Geneva Neuroscience Center, Geneva University, Geneva, CH-1205, Switzerland
6. Department of Nuclear Medicine and Molecular Imaging, University of Groningen, University Medical Center Groningen, RB Groningen, 9700, Netherlands

Source: Physica Medica Published:2015

Abstract

Objective: The purpose of this work is to evaluate the impact of optimization of magnification on performance parameters of the variable resolution X-ray (VRX) CT scanner.MethodsA realistic model based on an actual VRX CT scanner was implemented in the GATE Monte Carlo simulation platform. To evaluate the influence of system magnification, spatial resolution, field-of-view (FOV) and scatter-to-primary ratio of the scanner were estimated for both fixed and optimum object magnification at each detector rotation angle. Comparison and inference between these performance parameters were performed angle by angle to determine appropriate object position at each opening half angle. Results: Optimization of magnification resulted in a trade-off between spatial resolution and FOV of the scanner at opening half angles of 90°-12°, where the spatial resolution increased up to 50% and the scatter-to-primary ratio decreased from 4.8% to 3.8% at a detector angle of about 90° for the same FOV and X-ray energy spectrum. The disadvantage of magnification optimization at these angles is the significant reduction of the FOV (up to 50%). Moreover, magnification optimization was definitely beneficial for opening half angles below 12° improving the spatial resolution from 7.5cy/mm to 20cy/mm. Meanwhile, the FOV increased by more than 50% at these angles. Conclusion: It can be concluded that optimization of magnification is essential for opening half angles below 12°. For opening half angles between 90° and 12°, the VRX CT scanner magnification should be set according to the desired spatial resolution and FOV. © 2015 Associazione Italiana di Fisica Medica.

Style	Citing Format
MLA	Arabi H, et al.. "Monte Carlo-Based Assessment of the Trade-Off Between Spatial Resolution, Field-Of-View and Scattered Radiation in the Variable Resolution X-Ray Ct Scanner." Physica Medica, vol. 31, no. 5, 2015, pp. 510-516.
APA	Arabi H, Kamali Asl AR, Ay MR, Zaidi H (2015). Monte Carlo-Based Assessment of the Trade-Off Between Spatial Resolution, Field-Of-View and Scattered Radiation in the Variable Resolution X-Ray Ct Scanner. Physica Medica, 31(5), 510-516.
Chicago	Arabi H, Kamali Asl AR, Ay MR, Zaidi H. "Monte Carlo-Based Assessment of the Trade-Off Between Spatial Resolution, Field-Of-View and Scattered Radiation in the Variable Resolution X-Ray Ct Scanner." Physica Medica 31, no. 5 (2015): 510-516.
Harvard	Arabi H et al. (2015) 'Monte Carlo-Based Assessment of the Trade-Off Between Spatial Resolution, Field-Of-View and Scattered Radiation in the Variable Resolution X-Ray Ct Scanner', Physica Medica, 31(5), pp. 510-516.
Vancouver	Arabi H, Kamali Asl AR, Ay MR, Zaidi H. Monte Carlo-Based Assessment of the Trade-Off Between Spatial Resolution, Field-Of-View and Scattered Radiation in the Variable Resolution X-Ray Ct Scanner. Physica Medica. 2015;31(5):510-516.
BibTex	@article{ author = {Arabi H and Kamali Asl AR and Ay MR and Zaidi H}, title = {Monte Carlo-Based Assessment of the Trade-Off Between Spatial Resolution, Field-Of-View and Scattered Radiation in the Variable Resolution X-Ray Ct Scanner}, journal = {Physica Medica}, volume = {31}, number = {5}, pages = {510-516}, year = {2015} }
RIS	TY - JOUR AU - Arabi H AU - Kamali Asl AR AU - Ay MR AU - Zaidi H TI - Monte Carlo-Based Assessment of the Trade-Off Between Spatial Resolution, Field-Of-View and Scattered Radiation in the Variable Resolution X-Ray Ct Scanner JO - Physica Medica VL - 31 IS - 5 SP - 510 EP - 516 PY - 2015 ER -

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