The frequency of the HF oscillations within the ultrasound pulses of equipment for diagnostic ultra- sonography was measured in 26 transducer probes using 4 different measurement ethods. The reliability of the different methods was compared, including statistical evaluations. Counting of the unrectified HF oscillations on the screen of the apparatus 7100 MA (Kretztechnik Co.) involving sufficient scale extension and a precise, quartz-controlled time marker, proved to be most accurate and can be recommended for hospital use. For apparatus without facilities for unrectified echo representation and without a precise electronic time marker, the measurement method according to Filipczynski’s principle can be recommended. The two other methods proved to be less accurate.

Keywords:
Diagnostic ultrasonography, Ultrasound pulses, High frequency oscillations, Measurement methods
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© 1972 S. Karger AG, Basel
1972
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