COMPRESSING DATA VOLUME OF LEFT-VENTRICULAR CINEANGIOGRAMS

In this paper a method of compressing data volume for left ventricular cineangiograms is proposed. This method enables digital-optical discs to store the cineangiograms with an equivalent recording density to t hat of HDTV VTR's while preserving the quality of the original image. The data volume of the cineangiograms is compressed by approximating f unction and storing its coefficients. With this method, each cineangio gram frame is first decomposed into three regions: the inner part, the inner wall, and the background (using a statistical method previously reported by the authors). Each region is then compressed by means of a difference operation and an adaptive approximation with smooth funct ions. Performance is tested on 20 cases using actual cineangiograms. T he specifications were verified for a spatial resolution of 1000 TV li nes, a dynamic range of 60 dB, an SNR of 40 dB [p-p/rms], volume compr ession to 7% of the original volume, and 0.19 [second/frame] for decod ing on a 1.7 MFLOPS computer.