Evaluation of Radiation Dose to Working Staff in Interventional Digital Fluoroscopic Procedures

• Main Authors: Da-Fu Liao, 廖大富
• Other Authors: Bai-Shuan Liu
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/42270505534190112596

碩士 === 中臺科技大學 === 放射科學研究所 === 99 === The personal radiation dosimetry monitoring of medical staffs has important effects on their health, the patient’s absorbed radiation, and related health care quality. This study was designed to measure the absorbed radiation of unshielded area of human body among medical staffs by wearing an additional personal dosimetry badge outside the protective apron. In this study, the surface radiation dose of six radiologists was measured for seven consecutive months while they were performing interventional procedures under digital fluoroscopic imaging modalities. A phantom was used in this study to evaluate the relations between hand radiation doses and distance from imaging source. The central ray of radiation was pointed at the center of a phantom using a segmented irradiation technique with a total exposure time of 30 minutes. For the abdomen and chest phantom tests, the irradiation techniques were 106 kVp/6.5 mA and 86 kVp/6.5 mA respectively. The results showed that the readout from badges worn by the standard method was 0 mSv (original readout minuses background dose). The readouts from other unshielded badges showed that the mean absorbed dose per capita per month of digital angiography procedures for the brain, abdomen and other human parts, were 0.13±0.05, 3.31±1.28, and 6.76±4.10 mSv respectively. In the abdomen phantom test, the radiation doses measured at 0, 10, 30, 60 and 90 cm away from phantom center were 720.50±15.49, 17.34±0.68, 5.30±0.26, 1.02±0.09 and 0.35±0.00 mSv respectively. A protective glove could reduce the radiation dose by about 66.5%. In the chest phantom test, the radiation doses measured at 5 and 30 cm away from phantom edge were 24.08±3.03 and 3.03±0.02 mSv respectively, and similarly a protective glove could reduce the radiation by about 40.7%. There are potential risks of radiation hazards for medical staffs performing interventional procedures. The standard method of wearing a personal dosimetry badge is not able to measure the skin dose. We need additional devices for the evaluation of absorbed dose to the skin or extremities.