| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain a perfusion image usable for diagnosis even if a change in a signal strength due to a contrast medium is small. <P>SOLUTION: An average signal strength change profile Smean is obtained on the basis of signal strength change profiles S1(x<SB POS="POST">1</SB>, y<SB POS="POST">1</SB>) to Sn(x<SB POS="POST">z</SB>, y<SB POS="POST">z</SB>). Then, a base line BL and a peak value (minimum value) Smin are obtained, and a standard deviation SDbase is further obtained. Then, a statistical amount Z is calculated by using the peak value Smin of signal strength, a signal strength SDbase indicated by the base line BL and the standard deviation SDbase. The statistical amount Z is compared to a threshold value Z0, and when the value of the statistical amount is smaller than the threshold value Z0, the signal strength change profiles S1(x<SB POS="POST">1</SB>, y<SB POS="POST">1</SB>) to Sn(x<SB POS="POST">z</SB>, y<SB POS="POST">z</SB>) are smoothed. <P>COPYRIGHT: (C)2012,JPO&INPIT |
