Investigation of dose for the triple-source computed tomography based on Monte Carlo Simulations

Abstract

Triple-Source Computed Tomography (TSCT) improves the temporal resolution by three times the conventional Single-Source Computed Tomography (SSCT). The theories and implementations of TSCT have been well established in previous studies. However, whether additional X-ray tubes increase the dose remains unknown. To solve this problem, a TSCT system was simulated by Monte Carlo simulation. For comparison, an SSCT was also simulated under the same condition. The source models of SSCT and TSCT were validated against the experimental result obtained from a literature. In the simulation experiment, a digital human body phantom was scanned by the simulated computed tomography systems, and the dose was calculated. Result of the comparison revealed that the total absorbed doses of SSCT and TSCT were almost equal under the same data requirements and the dose distribution of TSCT was more even. Given no additional dose and the improved temporal resolution, TSCT is a promising tool for dynamic imaging.

Assessment of organ and effective dose when using region-of-interest attenuators in cone-beam CT and interventional fluoroscopy

“…[24][25][26] As others have done in order to calculate absolute organ doses from the Monte Carlo simulation, a calibration factor was determined. [27][28][29] The calibration factor Fc is a function of beam energy E and is given by E Q -T A R G E T ; t e m p : i n t r a l i n k -; e 0 0 1 ; 3 2 6 ; 9 5 ðFcÞ E ¼ ðD meas Þ E ∕ðD MC Þ E ;…”