CT肺癌検診の被曝線量

概要

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We perform lung cancer screening computed tomography (LSCT) with helical CT using 30 cm for males and 26 cm for females as the standard conditions of the scan range. We discuss the differences in tissue dose, organ dose, and effective dose according to these scan ranges. We discuss the differences in tissue dose, organ dose, and effective dose according to these scan ranges. We compared tissue dose, organ dose, and effective dose among LSCT and conventional lung cancer screening using chest radiography and chest fluorography. Scanning parameters were 120 kV, 25 mA, 10 mm slice thickness, and 20 mm/2 sec/rotation. The effective doses were 1.40 mSv for males and 1.15 mSv for females for LSCT, 0.02 mSv for chest radiography, and 0.07 mSv for chest fluorography. When the scan range was expanded from 26 cm to 30 cm on LSCT, the absorbed doses of the abdomen and bone marrow, and the effective doses increased because the scan range covered organs of the abdomen including liver, stomach, lumbar vertebrae, lower ribs, and thoracic vertebrae. Therefore, we propose that it is necessary to interrupt the x-rays at precisely the time that the scan reaches the bottom of the lung in order to reduce the effective dose.
社団法人日本放射線技術学会の論文
2001-08-20