A 3-D DISPLAY WITH A LINEARLY MOVING MIRROR TO REFLECT A SERIES OF 2-D CROSS-SECTIONS AND ITS APPLICATION TO NONINVASIVE ANGIOGRAPHY

A 3-D display equipped with a linearly moving mirror reflecting a series of 2-D cross sections pictures has been devised. The pictures were displayed by a CRT in perfect synchronization with the back-and-forth movements of the mirror. The 80 × 80 × 80 mm3 3-D space contained 128 × 128 pixels; with each pixel having 256 grades of intensity, enough to produce a satisfactory 3-D image of an ultrasonic echogram of hepatic vessels. The images can be observed from different angles by changing the observer's position or by prompt rotation of the image through a console. Mechanical problems inherent in using moving parts have been solved.