Abstract

Objective To identify the spatial distribution of stray radiation from mobile CT head scanning for the purpose of radiation protection. Methods The head series of CareTom mobile CT were scanned and the radiation dose was measured using TLD (LiF: Mg, Cu, P). The isodose maps of radiation dose field were plotted using Matlab software. Results Radiation dose in the front of the mobile CT was slightly higher than that in the back. The maximum value of 0.255 mGy was found to be at 0.5 m from the scanning hole center. Conclusions The stray radiation dose from mobile CT head scanning was relatively low. However in order to avoid the damage to the operators and other medical workers from long-term low dose exposure, it should keep 2 m away from mobile CT, beside or behind, when in operation. Key words: Mobile CT; Head scanning; Radiation dose field

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