. Author manuscript; available in PMC: 2021 Mar 1.

Published in final edited form as: IEEE Trans Radiat Plasma Med Sci. 2019 Jul 23;4(2):170–183. doi: 10.1109/trpms.2019.2930362

TABLE III.

Analysis of Strengths, Weaknesses, Opportunities and Threats (SWOT) of the CPGM method.

Strengths	Weaknesses
Single detector, no collimator Compactness Lightweight Integration with gantry Alignment with X-ray panels Independent on bunch structure Affordable	Dependence on proton number Efficiency calibration Attenuation coefficients Nuclear concentration Shallow treatment sites
Extension to two detectors Slightly off-axis Dual-energy CT Integration with PGT Integration with PGS Combination with PET Widespread applicability	Challenging count rate Neutron-induced background Nuclear cross sections New accelerators
Opportunities	Threats