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New equipment for transrectal ultrasonotomography has been developed. With this equipment an excellent cross-section picture of various intrapelvic organs is easily obtained. Diagnostic application of the technique is particularly significant for abnormalities of the prostate because the shape of the prostate cannot be revealed by x-ray.

Diagnostic criteria for prostatic disease are described, with the demonstration of typical cases. In a test by well trained physicians the diagnostic accuracy of the new technique was more than 80 per cent. Ultrasonotomography provided for precise measurement of the prostatic size.

Transrectal ultrasonotomography is a promising new diagnostic technique that yields abundant information not available with former methods of examination. The procedure is likely to become one of the most important diagnostic tools in the field of urology.