| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an image evaluation method which can quantitatively show the visibility of low contrast and a fine line object for clinical practice, and X-ray fluoroscopic equipment using it. <P>SOLUTION: In an image evaluation method and X-ray fluoroscopic equipment 1 using it, an image which suppresses noise components can be created by averaging the X-ray fluoroscopic image of two or more frames. Therefore, because the edge part is not buried in the noise component even when the difference of pixel values between the edge part of a metal plate 11 and an object M under test is small and low contrast, an appropriate peak value can be obtained from an edge weighted image. Also, the peak value of the edge part is obtained from the edge-weighted image. Because the peak value indicates such a large value that the edge part in an average image is not blurry and is sharp, it permits the correlation of an index value which is calculated by dividing the peak value with standard deviation can correlate with the visibility of a low contrast and fine line object. <P>COPYRIGHT: (C)2013,JPO&INPIT |
