ASTUDY OF VOLUME MEASUREMENT FOR DIGESTIVE TRACT TUMORS BY THREE-DIMENSIONAL ULTRASOUND SYSTEM

Abstract

We studied the volume measurement by the three-dimensional ultrasound system using ultrasonic probe. The ultrasonic frequency of probe was 12MHz and 20MHz. The scanning method was the mechanical spiral one. This system could obtain 40 radial scaned images and 8mm, 20mm and 40mm images of linear scanning. The volume was measured in a water tank for 180bjects of resected spleen of an already-known volume. The mean measured volume was 115.4% (108.8-121.2%) of real one. It was difficult to measure the volume accurately for objects with irregular form. Objects with small volume were able to be measured more accurately by reducing the width of the slice. As for the measurements by frequency 20MHz, errors were fewer than the measurements by 12MHz. To improve the accuracy of the volume measurement, it was suggested to be necessary to shorten the scanning time and to decrease the slice width.