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EVALUATING PHANTOM OF CT APPARATUS AND EVALUATING METHOD USING THIS AND METHOD OF MANUFACTURING EVALUATING PHANTOM
EVALUATING PHANTOM OF CT APPARATUS AND EVALUATING METHOD USING THIS AND METHOD OF MANUFACTURING EVALUATING PHANTOM
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机译:CT设备的幻影评估以及使用该幻影幻影评估方法
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摘要
PROBLEM TO BE SOLVED: To accurately evaluate spatial resolution of a cross-sectional image obtained by a high resolution type CT apparatus. ;SOLUTION: A copper film 3 and a polyethylene film 4 different in an absorbing factor of a radioactive ray and thinly workable in a thickness are alternately laminated on a side surface of a columnar material 2 to constitute an evaluating phantom 1, a cross-sectional image is photographed by using the CT apparatus on a cross section of the evaluating phantom 1 almost vertical to the axis of the columnar material 2, and a layer of a stripe-shaped film on the cross-sectional image is observed to evaluate spatial resolution of the cross-sectional image. The spatial resolution can be more accurately evaluated by measuring MTF by using a difference in contrast between two kinds of films in the cross- sectional image.;COPYRIGHT: (C)2001,JPO
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