Àá½Ã¸¸ ±â´Ù·Á ÁÖ¼¼¿ä. ·ÎµùÁßÀÔ´Ï´Ù.
KMID : 1033420170200010055
Journal of Korean Society of Cardio-Vascular Interventional Technology
2017 Volume.20 No. 1 p.55 ~ p.63
The analysis of scattered radiation distribution depends on changing tube angle in angiography suite
Yun Tae-Young

Son Jeong-Woo
Kim Jae-Kwang
Kim Dae-Yong
Cho Myeong-Ju
Song Chang-Uk
Kim Dong-Seong
Abstract
Purpose : During interventional procedures, various fluoroscopic angles including frontal, lateral, and oblique projections are utilized. This is to allow the tube angle to be changed as needed when the blood vessels overlap each other or are obscured by a coil or other structures. Generally, the amount of radiation exposure to the operator changes based on the tube and detector positions. Therefore, the purpose of this study is to measure the difference in scattered radiation distribution in an angiography suite at different tube angles, thereby contributing to the reduction of exposure dose to medical staff.

Material and method : Experiments were carried out using a SIEMENS Artis ZEE Ceiling type device and an Anthropomorphic Phantom (Source Detector Distance: 120 cm, Source Table Distance: 60 cm, and TDD (Table Detector Distance): 60 cm). A total of 10 locations were selected at 100-cm from the center of the tube, between ?150¡Æ ~ +150¡Æ at an interval of 30¡Æ. Dosimeter was positioned at a height of 150 cm from the ground and the dose of scattered radiation was measured five times for 30 seconds each, while changing the tube angle to 0¡Æ, RAO 30¡Æ, RAO 45¡Æ, LAO 30¡Æ, LAO 45¡Æ, cranial 25¡Æ, and Caudal 25¡Æ. The exposure conditions were fixed at 7.5 p/s under abdomen-fluoroscopy conditions.

Result : Scattered radiation dose was the lowest at 0¡Æ and the highest at ¡¾ 120¡Æwhen the tube angle was fixed at 0¡Æ. Overall, the scattered radiation dose measured between ¡¾ 60¡Æ and ¡¾ 150¡Æ was higher than that measured between 0¡Æ and ¡¾ 30¡Æ. When the scattered radiation was measured at the selected points between 0¡Æ ~ 150¡Æ while changing tube angles, the highest scattered radiation dose was measured at RAO 45¡Æ and the lowest at LAO 45¡Æ. On the other hand, the highest radiation dose was measured at LAO 45¡Æ and the lowest at RAO 45¡Æ on selected points between 0¡Æ ~ ?150. The radiation dose measured at Cranial 25¡Æ and Caudal 25¡Æ were similar to that measured at tube angle 0¡Æ

Conclusion : This study showed that the distribution of scattered radiation is different at varying tube angles in an angiography suite. Medical staff should be aware of the result of this study, thereby reducing unnecessary radiation exposure during the interventional procedures.
KEYWORD
FullTexts / Linksout information
Listed journal information