X線管陽極熱量によるCT値の変動

概要

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We report fluctuations in CT value(HU)in accordance with the anode heating percentage of the x-ray tube. We measured the CT value after changing the anode heating percentage of the x-ray tube in three CT machines. Our results demonstrated fluctuation in the CT value in the two CT machines that had the beam trimmer in the front of the detector. This fluctuation increased as section thickness decreased. The cause of fluctuation was movement of the focus to the cathode side, because the anode expanded with heat. The movement of the focus caused shading of the x-ray by the beam trimmer, and fluctuation of the x-ray dose to the detector caused fluctuation of the CT value and standard deviation (SD). In order to decrease fluctuation of the CT value, it is necessary to check and adjust the alignment of the x-ray tube, slit, beam trimmer, and detector.
公益社団法人日本放射線技術学会の論文
1998-07-20