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KMID : 1033420170200010064
Journal of Korean Society of Cardio-Vascular Interventional Technology
2017 Volume.20 No. 1 p.64 ~ p.75
Comparison of radiation dose according to change of electronic shutter and presentation of the appropriate setting for reducing radiation dose
Kim Yong-Jun

Choi Deok-Yong
Lee Woo-Yong
Lee Ju-Chul
Kim Hyun-Ju
Abstract
Purpose : To estimated the appropriate setting value of electronic shutter in order to reduce the radiation exposure by analyzing the changes of radiation dose which correlate with differences in distance between collimator and electronic shutter value.

Material & Method : Artis Zee Ceiling FPD Single-plane (Siemens), Acryl Phantom(30 x 30 x 30 §¯) filled with water, and Dosimeter(Unfors) were used. Firstly, exposure dose were measured with Water Phantom and Dosimeter, as exposing 100 kVp, 250 mA, 1000 ms in a single exposure without shutter. and set FOV 200*200mm using collimator. Then, the exposure dose were calculated whose value were same as shutter value __ by increasing FOV by 8mm from 0 to 20 pixels at 5 pixels intervals. Secondly, to measure the exposure dose with Water Phantom and magnification factor, magnification factors were changed following 48, 42, 32, 22, 16 and 11cm in auto control mode, and exposed x-ray with decreasing FOV by 0.8mm intervals for each magnification factor. Based on the results, DAP value and Air-kerma of SR-report were calculated.

Results : The study on exposure dose using Water Phantom and Dosimeter has shown that as FOV increased from 200.0mm to 203.2mm, the mean value of exposure dose increased from 68.044 ¥ìGy to 68.385 ¥ìGy. Secondly, the result of study on exposure dose using Water Phantom and magnification factor has shown that the higher the magnification factor, the lower the DAP value. In the setting of fixed magnification factor, the DAP values also decreased with decreased FOV.

Conclusions : Unnecessary radiation exposure covered by the shutter can be curtailed by decreasing the value of the electronic shutter set toward less than zero.
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