[en] To estimate myocardial wall motion, digital subtraction angiograms were analyzed using ECG as synchronizing signal. The Fourier analysis is covenient for such a periodic motion as the heart. Every part of wall in contracting motion is characterized by the amplitude and the phase lag of fundamental component of density change in a cardiac cycle. This technique has already been adopted for the RI image, but not yet applied to DSA images. Experimental analysis were performed on a normal subject and a patient suffered from anterior myocardial infarction. Images were obtained in a 30 right anterior oblique projection and stored in VTR with ECG signal. The analysis was performed by the mini-computer system on 128 x 128 x 8 bit digital image sequences. The results of analysis are represented in two dimentional image such as a phase image and an amplitude image. From these images, it is easy to understand that the motion of the normal heart is synchronized over the area of left ventricle, while dyskinesis in apical region is appeared for the case of anterior myocardial infarction. Three dimentional display of wall motion characteristics seems very powerful for diagnosis especially to determine the abnormal area. (author)