Korean Journal of Digital Imaging in Medicine (대한디지털의료영상학회논문지)

The Korean Society for Digital Imaging in Medicine (대한디지털의료영상학회)
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Research For Reducing Patient Dose that Low Extremity CT Angiography Using Automatic Current Selection

하지동맥조영 전산화단층촬영에서 자동선량 조절장치를 이용한 환자선량 감소 연구

  • An, Hyeong-Theck (Department of Radiology, Kyung Hee University Hospital at Gangdong) ;
  • Kim, Jae-Yeol (Department of Radiology, Kyung Hee University Hospital at Gangdong) ;
  • Yeo, Woon-Sik (Department of Radiology, Kyung Hee University Hospital at Gangdong) ;
  • Park, Yong-Sung (Department of Radiology, Kyung Hee University Hospital at Gangdong) ;
  • Lee, Gui-Won (Department of Radiological Technology, Dongnam Health College) ;
  • Lee, Jong-Woong (Department of Radiology, Kyung Hee University Hospital at Gangdong)
  • 안형택 (강동경희대학교병원 영상의학과) ;
  • 김재열 (강동경희대학교병원 영상의학과) ;
  • 여운식 (강동경희대학교병원 영상의학과) ;
  • 박용성 (강동경희대학교병원 영상의학과) ;
  • 이귀원 (동남보건대학교 방사선학과) ;
  • 이종웅 (강동경희대학교병원 영상의학과)
  • Received : 2013.09.03
  • Accepted : 2013.10.20
  • Published : 2013.11.30
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Abstract

Purpose : Fixed way of mAs previously Low Extremity Computed Tomography Angiography(LECTA) examination were used. Automatic Current Selection(ACS) to use for the purpose of reducing the dose when Low Extremity Computed Tomography Angiography examining patients. Materials and methods : Were analyzed from July 2011 to July 2012 MDCT examination of Dose Length Product(DLP) LECTA 116 Case. It was defined as previous inspection methods(Old protocol). CT workstation is set to 100 mAs and 150 mAs protocol based on the patient's weight 70kg examined by LECTA. We defined as 'New protocol' that applies to ACS. The data collection period are 76 cases from October 2012 to January 2013 Results : 1. Average Total DLP of 'Old protocol' is 3602.943 $mGy^*cm$. 2. Average Total DLP of 'New protocol' is 1762.977 $mGy^*cm$. 3. Due to the 'New Protocol' use of Total DLP was reduced by approximately 51 %. Phase-specific dose reduction is as follows. Pre(33.62 %), Artery(64.63 %), Delay(49.0 %) 4. Using One way ANOVA Analysis of fluctuations obtained DLP is as follows. 'Old protocol', 'New protocol' a value of P < 0.001, P = 0.882 values were obtained. Conclusions : Dose reduction of 51 % is a useful study that proves. The results obtained using the ACS, the effects of a dose reduction of 51 % was obtained. Therefore, it has been proven to be a useful way. Statistics using SPSS version came out of the 'Old protocol' P-value P < 0.0001. This result means that the DLP a large difference values. On the other hand, The results of the 'New protocol' was P = 0.882. These results means to that small and regularly was fluctuations of the dose. The use of ACS, you can get a reduction of the dose and will able to get the effect of reducing the dose errors.

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