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  • Ultrasonic scanning systems that include an ultrasonic scanner, transducers (frequencies of 7.5 to 15.0 MHz are typical because of the high resolution needed), dedicated software, an image recorder (e.g., videocassette), and a printer. These systems generally use high-frequency broadband transducers, and some also include continuous-wave and pulsed-wave Doppler capabilities and a spectrum analyzer. Most mammographic ultrasonic scanning systems are used as an adjunct to mammography to distinguish cystic from solid lesions in the breast, but some high-resolution digital ultrasound systems that include Doppler capabilities are also used to differentiate between malignant and benign tissue in the breast.
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