螺旋状(ヘリカル)スキャンを用いた肺がんスクリーニングCTの医療被曝について

概要

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[Purpose]The object of this study was to clarify the medical exposure in Lung cancer Screening CT (LSCT) using Helical Scan focusing on the dose characteristics of helical scaning, comparisons with conventional chest mass screening, and risk benefit analisis. [Meghods] Radiation dose was measured at both the center and surface of chest and abdominal standard phantoms using a thermoluminescene dosimeter. Scanning parameters employed were 120kV, 50mA, 10mm X-ray beam width, 1s/rotation scanning speed, 20 mm/s couch top movement speed, and 260 mm scanning range. [Results] The dose at the center of the phantom using LSCT was 2.6 mGy, ten times higher than that for conventional mass chest fluorography. On the other hand, the dose was almost the same as that for mass screening fluorography of the upper gastrointestinal tract, only 1.3 times higher. Balance ages in risk benefit analysis were 33 years old for men and 38 years old for women. [Conclusion] Clarification of the characteristics of LSCT has demonstrated that LSCT is suitable for mass chest screening examinations.
公益社団法人日本放射線技術学会の論文
1996-01-01