SPECT画像のROC解析 : ローパスフィルタの遮断周波数による信号検出能への影響

抄録

We studied the image detectability of single photon emission computed tomography (SPECT) quantitatively with the receiver operating characteristic (ROC) using the method of continuously-distributed test result. These images were processed using a low pass filter with differently arranged cut-off frequency values, on the other hand, other processes were kept constant. As a result, in general the highest detectability of cold lesions with 10mm and 15mm diameter signals were at 0.18cycles/pixel (c/p) and 0.15c/p of cut-off frequency. Otherwise, the highest detectability of the signal location was at 0.15c/p or 0.12c/p of cut-off frequency when the distance of the signal location to the center of the phantom was less than 8cm. At the border of the phantom, peak detectability was shown to be 0.20c/p. In conclusion, the detectability of signal locations differed at nearby center and border of the phantom when when the value of the cut-off frequency arranged by low pass filter was changed.