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A new ultrasonic mass-screening system for the early detection of breast cancer without palpation is described. This system has been developed in order to detect a tumor larger than 5 mm in size. The entire region where breast cancer may develop can be scanned at one time by rotating the 5 MHz waterproof array transducer in a water bath. The real-time B-mode image with a wide viewing width of 190 mm can be obtained by electronic linear scanning. The screening time is less than 5 minutes per examinee. This trial system is confirmed to be effective for clinical mass-screening.

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