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KMID : 0357520100330020127
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Journal of Radiological Science and Technology
2010 Volume.33 No. 2 p.127 ~ p.132
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The Assessment of Scattered Ray According to the Beam Thickness of Z-axis in MDCT(Multi Detector Computed Tomography)
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Ryu Gwi-Bok
Kim Hyun-Soo
Lyu Kwang-Yeul
Dong Kyung-Rae
Kweon Dae-Cheol
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Abstract
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The purpose of this study is to measure scattered ray which is occurred except for Z-axis range of the detector in MDCT’s iso-center and present the basic data about the standard for reduction of scattered ray. The development of MDCT brings out the enlargement of beam thickness to the patient’s Z-axis, which distributes to the increase in exposure dose according to the rise of scattered ray. Also MDCT brings out the increase of scattered ray about 4times more than SDCT. To evaluate scattered ray according to the change of beam thickness on MDCT, we measured scattered ray of MDCT’s Z-axis beam thickness by using one 16-slice CTs and two 64-slice CTs. We used the ionization chamber 60ml 2026C as the equipment of measurement. In our results, we found out that the change of scattered ray according to the beam thickness in the same kVp has increase of scattered ray. Secondly we found out the increase of scattered ray according to the increase of kVp. Lastly we found out the decrease of scattered ray according to the increase of the distance from the ionization chamber.
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KEYWORD
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MDCT, scattered ray, SDCT, kVp
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