Evaluation of Over Ranging in 64-slice Multidetector-row Computed Tomography Examinations for Upper Abdomen

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  • Ueno Hiroyuki
    Department of Radiological Technology, Takaoka Municipal Hospital
  • Matsubara Kousuke
    Department of Quantum Medical Technology, Faculty of Health Sciences, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University
  • Koshida Kichiro
    Department of Quantum Medical Technology, Faculty of Health Sciences, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University

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Other Title
  • 64列MDCTを用いた上腹部撮影におけるオーバレンジングに関する検討
  • 64レツ MDCT オ モチイタ ジョウ フクブ サツエイ ニ オケル オーバレンジング ニ カンスル ケントウ

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Abstract

64-slice multidetector-row computed tomography (MDCT) have become widely used in recent years, but there is a possibility that a large volume of dose is radiated at the outside of the scope of scanning due to the effect of over ranging (OR). In this research, the dose volume change at the outside of the scope of scanning in the case of X-ray beam width (BW) and pitch factor (PF) is measured, and the effect of BW and PF on OR is considered. We scanned the upper abdomen of an acrylic human phantom using 64-slice multidetector-row CT in 4 conditions while changing BW and PF. We then measured the dose volume absorbed in the breasts, ovary, uterus, and the dose profile on the surface of phantom. As a result, when BW and PF are increased, the dose volume radiated at the outside of the scope of scanning increased, and the effect of OR appeared. Therefore, when BW and PF are set, X-ray radiated at the outside of the scope of scanning should also be considered.

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