PROBLEM TO BE SOLVED: To provide an X-ray shielding material for X-ray CT(Computed Tomography) examination and an X-ray CT examination method, allowing proper acquisition of CT image data, and reducing bad influence on a human body as thoroughly as possible.SOLUTION: In this X-ray CT examination method, a protection portion is covered with the X-ray shielding material for the CT examination containing zinc or tin, a portion to be examined is irradiated with X-rays, and the CT image data are acquired by use of a high energy component not less than 100 keV of the X-rays transmitted through the X-ray shielding material while shielding a low energy component not more than 40 keV of the X-rays unnecessary for the acquisition of the CT image data with the X-ray shielding material. By covering the protection portion with the X-ray shielding material, the low energy component is shielded, so that exposure dose reduction effect in the protection portion can be obtained. The high energy component passes a body, and is utilized as the data of an X-ray CT image, so that the CT image data can be properly acquired.COPYRIGHT: (C)2012,JPO&INPIT【課題】CT画像データを的確に取得することができ、かつ、人体への悪影響をできる限り少なくすることが可能なCT検査用X線遮へい材及びX線CT検査方法を提供する。【解決手段】亜鉛や錫を含むCT検査用X線遮へい材で防護部位を覆って被検部位にX線を照射し、CT画像データの取得に不要なX線の40keV以下の低エネルギー成分をかかるX線遮へい材で遮へいしつつ、X線遮へい材を透過するX線の100keV以上の高エネルギー成分を用いてCT画像データを取得する。X線遮へい材で防護部位を覆っていることにより、低エネルギー成分が遮へいされて、防護部位における被曝低減効果が得られるとともに、高エネルギー成分が体内を通過し、X線CT画像のデータとして利用され、CT画像データも的確に取得することができる。【選択図】図1
