| 摘要 |
<p>A method and an apparatus for adjusting an exposure does using standard deviation of CT(Computerized Tomography) number in coronary CT angiography are provided to select accurate tube current by a directly measured value obtained from an image of a patient. An apparatus for adjusting an exposure does using standard deviation of CT number in coronary CT angiography includes a tube current adjusting table storing unit(8), and a central processing unit(3). The tube current adjusting table storing unit(8) divides the standard deviation of the CT number outputted from the coronary CT image into a plurality of levels, and stores a tube current adjustment value corresponding to each level in a pre-set table. The central processing unit(3) outputs the standard deviation of each CT number from the coronary CT image, extracts a tube current value corresponding to the standard deviation of the outputted CT number from the tube current adjusting table storing unit(8), and includes a scan control process which controls a scan operation when photographing CT by the extracted pipe current value.</p> |
