Journal of the Korean Society of Radiology (한국방사선학회논문지)

The Korean Society of Radiology (한국방사선학회)
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Characterization of Cone-beam Computed Tomography System for Small Animal

콘빔형 소동물용 전산화단층촬영(CT) 장치의 성능평가

  • Kang, Hyeong-Geun (Department of Radiological Science, Catholic University of Daegu) ;
  • Chon, Kwon-Su (Department of Radiological Science, Catholic University of Daegu)
  • 강형근 (대구가톨릭대학교 방사선학과) ;
  • 천권수 (대구가톨릭대학교 방사선학과)
  • Received : 2009.11.18
  • Accepted : 2010.03.15
  • Published : 2010.03.31
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Abstract

A cone-beam computed tomography (CT) system for a small animal has been widely used in the bio-medical application. This paper introduced simple methods for evaluating a cone-beam CT system using a simple tungsten wire phantom of 10{$\mu}m$ diameter and a water phantom. Slice images and three-dimensional tomography images were obtained through 360 projection views per one sample rotation under stable X-ray tube conditions for a long running time. The cone-beam CT system at a position of a 1.07 magnification showed a spatial frequency of 13.78 lp/mm ($36.2{\mu}m$ spatial resolution) and gave a CNR of 10.33 and a S/N of 5.87 under a tube voltage of 80kV.

콘빔형 소동물용 CT 장치는 바이오-의료분야의 기초 실험에 활발히 응용되고 있다. $10{\mu}m$의 직경을 가진 텅스텐 와이어(wire)와 물 팬텀을 이용하여 비교적 간단한 방법으로 소동물용 CT 장치를 평가할 수 있는 방법을 제시하였다. X선 튜브가 안정적으로 장시간 운전 가능한 조건에서 $1^{\circ}$ 간격으로 360개의 투영영상을 획득하고, 영상재구성을 통하여 슬라이스 영상 및 3차원 영상을 얻었다. 콘빔형 소동물용 CT 장치는 배율 1.07배 위치에서 13.78lp/mm(공간해상도 $36.2{\mu}m$)를 나타내었고, 80kV의 관전압에서 CNR 10.33 및 S/N 5.87을 보였다.

Keywords

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