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2. IEC:854, Methods of measuring the performance of ultrasonic pulse echo diagnostic equipment,1986
3. EEC: 1102, Measurement and characterisation of ultrasonic fields using hydrophones in the frequency range 0.5 MHz to 15 MHz,1991
4. IEC:87(Sec)25, Guidance for the measurement and characterisation of ultrasonic fields generated by medical ultrasonic equipment using hydrophones in the frequency range 0.5 to 15 MHz, ultrasonic transducers having cylindrical or spherical active element, International Electrotechnical Commission.
5. Miniature piezoelectric polymer ultrasonic hydrophone probes