Journal of Digital Convergence (디지털융복합연구)

The Society of Digital Policy and Management (한국디지털정책학회)
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A Study on the Mitigation of the Exposure Dose Applying Bolus Tracking in Brain Perfusion CT Scan

뇌 관류 CT검사에서 BolusTracking기법을 적용한 피폭선량 저감화에 관한 연구

  • Kim, Ki-Jeong (Dept. of Health Care, Hanseo University) ;
  • Jung, Hong-Ryang (Dept. of Diagnostic Radiology, Konkuk University Hospital) ;
  • Lim, Cheong-Hwan (Dept. of Diagnostic Radiology, Konkuk University Hospital) ;
  • Hong, Dong-Hee (Dept. of Diagnostic Radiology, Konkuk University Hospital) ;
  • Shim, Jae-Goo (Dept. of Diagnostic Radiology, Konkuk University Hospital) ;
  • You, In-Gyu (Dept. of Diagnostic Radiology, Konkuk University Hospital)
  • 김기정 (한서대학교 보건의료학과) ;
  • 정홍량 (건국대학교병원 영상의학과) ;
  • 임청환 (건국대학교병원 영상의학과) ;
  • 홍동희 (건국대학교병원 영상의학과) ;
  • 심재구 (건국대학교병원 영상의학과) ;
  • 유인규 (건국대학교병원 영상의학과)
  • Received : 2014.02.07
  • Accepted : 2014.03.20
  • Published : 2014.03.28
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Abstract

This study was conducted to analyze the patient's exposed dose targeting the patients who had acute ischemic stroke symptoms and CT brain perfusion scan, by comparing fixed time technique and bolus tracking technique which was provided by the manufacturer and to identify the Time graph to implement the usability of contrast medium's tracking technique the best contrast enhancement intervals. $CTDI_{VOL}$ of PCT in patient appeared to be 431.72mGy in fixed scan delay protocol, whereas 323.61mGy in Bolus tracking technique. The value of DLP appeared to be $1243.47mGy{\cdot}cm$ in fixed scan delay protocol, whereas $932mGy{\cdot}cm$ in Bolus tracking technique. Time graph appeared to be various in fixed scan delay protocol, whereas the optimal time graph could be obtained in Bolus tracking. The exposure dose could be reduced by 25% applying Bolus tracking technique when taking brain perfusion CT scan.

급성기 허혈성 뇌졸중 증상이 있는 뇌 관류 CT 검사를 시행한 환자를 대상으로 장비사가 제시한 고정 시간 기법(Fixed time technique)과 조영제 추적 기법(Bolus tracking technique)을 비교하여 환자의 피폭선량을 분석하고자 하였으며, 조영제 추적 기법의 유용성과 최적의 조영증강 구간을 구현하는 Time graph를 알아보기 위한 것이다. 환자에서는 PCT의 $CTDI_{VOL}$은 고정시간기법에서 431.72mGy, Bolus tracking에서 323.61mGy로 측정되었고, DLP값은 고정시간기법에서 $1243.47mGy{\cdot}cm$, Bolus tracking에서 $932mGy{\cdot}cm$로 측정되었다. Time graph는 고정시간기법에서 다양하게 나타났으나, Bolus tracking 기법에서는 최적의 Time graph를 얻을 수 있었으며, 뇌 관류 CT검사 시 Bolus tracking기법을 적용하여 피폭선량을 25% 정도 감소시킬 수 있었다.

Keywords

References

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