Study on Evaluation Method of Radiation Dose of Patients in TACE of IVR-CT

Objective: To establish the conversion formula between the Entrance Surface Dose (ESD) of the patient in the TACE treatment and the Dose Index (DI) from equipment. Methods: ESDs were measured from 50 patients who received TACE (37 Males, 13 Females; (70.3±6.8) years old) by placing fluorescent glass dosimeters on the skin surface. ESDs were measured in three locations, including the dorsal surface of the lesion, the scan field of CT and cone beam CT (CBCT). The total ESD, ESD in each CT scan and CBCT scan were measured, respectively. AXIOM Artis dTA/i-CT (Siemens) was used as the equipment of IVR-CT. The relationship between perspective DI and perspective ESD were explored. Results: The conversion formula between ESD and DI is established as: ESD=(0.697×CTDI+7.175)×number of CT scans+0.384×CBCT DI-5.472+0.567×perspective DI -9.248. Conclusions: DI and ESD have a good linear correlation. We can use the conversion to formulate ESD in this study.