抄録
In recent years, the new SPECT data acquisition system equipped with three-head scinticameras improves the image scanning time significantly and the quality of images is improved by employing the new technetium-99m myocardial agents. QGS(Quantitative Gated SPECT)is the important method as an algorithm of the dynamic analysis of the heart. However, it is impossible to estimate the direction of the myocardium wall rotation. In order to solve this issue, we developed a new optical flow algorithm expanded to four dimensions. The application of the algorithm to QGS images accomplishes the tracing of 3-dimensional myocardium movement. The sufficient times of iteration in the algorithm for getting the stable images, is as small as 10 times. Calculated three-dimensional movement vectors of the myocardium wall were displayed with a Bull's eye displaying method. With the combination of 4-dimensional optical flow algorithm and the Bull's eye displaying method, it would be a powerful tool for showing myocardium wall motions in detail including its rotaion.
