The Journal of Korean Society for Radiation Therapy (대한방사선치료학회지)

Korean Society for Radiation Therapy (대한방사선치료학회)
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Comparison of Volumes between Four-Dimensional Computed Tomography and Cone-Beam Computed Tomography Images using Dynamic Phantom

호흡동조전산화단층촬영과 콘빔전산화단층촬영의 팬텀 영상 체적비교

  • Kim, Seong-Eun (Department of Radiation Oncology, Seoul national university bundang hospital) ;
  • Won, Hui-Su (Department of Radiation Oncology, Seoul national university bundang hospital) ;
  • Hong, Joo-Wan (Department of Radiation Oncology, Seoul national university bundang hospital) ;
  • Chang, Nam-Jun (Department of Radiation Oncology, Seoul national university bundang hospital) ;
  • Jung, Woo-Hyun (Department of Radiation Oncology, Seoul national university bundang hospital) ;
  • Choi, Byeong-Don (Department of Radiation Oncology, Seoul national university bundang hospital)
  • 김성은 (분당서울대학교병원 방사선종양학과) ;
  • 원희수 (분당서울대학교병원 방사선종양학과) ;
  • 홍주완 (분당서울대학교병원 방사선종양학과) ;
  • 장남준 (분당서울대학교병원 방사선종양학과) ;
  • 정우현 (분당서울대학교병원 방사선종양학과) ;
  • 최병돈 (분당서울대학교병원 방사선종양학과)
  • Received : 2016.11.01
  • Accepted : 2016.12.10
  • Published : 2016.12.30
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Abstract

Purpose : The aim of this study was to compare the differences between the volumes acquired with four-dimensional computed tomography (4DCT)images with a reconstruction image-filtering algorithm and cone-beam computed tomography (CBCT) images with dynamic phantom. Materials and Methods : The 4DCT images were obtained from the computerized imaging reference systems (CIRS) phantom using a computed tomography (CT) simulator. We analyzed the volumes for maximum intensity projection (MIP), minimum intensity projection (MinIP) and average intensity projection (AVG) of the images obtained with the 4DCT scanner against those acquired from CBCT images with CT ranger tools. Results : Difference in volume for node of 1, 2 and 3 cm between CBCT and 4DCT was 0.54~2.33, 5.16~8.06, 9.03~20.11 ml in MIP, respectively, 0.00~1.48, 0.00~8.47, 1.42~24.85 ml in MinIP, respectively and 0.00~1.17, 0.00~2.19, 0.04~3.35 ml in AVG, respectively. Conclusion : After a comparative analysis of the volumes for each nodal size, it was apparent that the CBCT images were similar to the AVG images acquired using 4DCT.

목 적 : Computerized imaging reference systems 동적팬텀을이용한 cone-beamcomputed tomography(CBCT) 영상과 four-dimensionalcomputed tomography(4DCT) 영상의 체적을 비교분석 하고자 한다. 대상 및 방법 : 동적팬텀 내에 직경 1, 2, 3 cm 노드를 각각 삽입하고, CT simulator와 TruebeamSTx X-ray Imaging system을 이용하여 4DCT 영상과 CBCT 영상을 얻었다. 4DCT 영상은 maximum intensity projection(MIP), minimum intensity projection(MinIP), 그리고 average intensity projection(AVG)영상으로 재구성 하고 노드의 체적은 Eclipse system의 CT ranger tool로 CT number를 설정하여 측정하였다. 결 과 : CBCT를 기준으로 노드1, 2, 3 cm의 체적을 비교하였을 때 4DCT의 MIP는 0.54~2.33, 5.16~8.06, 9.03~20.11 ml, MinIP는 0.00~1.48, 0.00~8.47, 1.42~24.85 ml, AVG는 0.00~1.17, 0.00~2.19, 0.04~3.35 ml의 차이를 보였다. 결 론 : 노드의 체적을 비교한 결과 CBCT 영상은 4DCT의 AVG 영상과 유사한 것으로 확인되었다.

Keywords

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