SPI ULTRASOUND REGISTRY REVIEW |141 questions |with correct answers

SPL CORRECT ANSWER wavelength x # of cycles With phased array transducers, the transmitted sound beam is steered by CORRECT ANSWER Varying the timing of pulses to the individual piezoelectric elements What type of wave is sound? CORRECT ANSWER mechanical and longitudinal The Frequency ranges for Ultrasound are: CORRECT ANSWER > 20,000 Hz (20kHz) The speed of sound in soft tissue is: CORRECT ANSWER 1540 m/s Linear sequence Array CORRECT ANSWER transducer that fires the elements in groups Unit for Wavelength CORRECT ANSWER is millimeters Enhancement is caused by CORRECT ANSWER weakly attenuating structures (such as a cyst) The wavelength in a material having a propagation speed of 1.5 mm/us employing a transducer frequency of 5.0 MHz is: CORRECT ANSWER 0.3 mm Wavelength= c/f = 1.5mm/us ÷ 5MHz = 0.3mm An ultrasound transducer converts: CORRECT ANSWER electrical energy into mechanical energy and vice versa The order of attenuation, from the lowest attenuation to highest: CORRECT ANSWER fat, muscle, bone, air