DAVIES SPI: IV. Pulse-Echo Instrumentation (30% of ARDMS)| 180 questions| verified answers

What is a typical frame rate for B-mode real-time imaging? A. 1-9 kHz B. 10-50 Hz C. 100-200 MHz D. 200-300 Hz E. 0.05-0.9 Hz CORRECT ANSWERS: B. 10-50 Hz <Frame rates are displayed in terms of Hz, a unit of frequency equal to one cycle per second. Although frame rates vary, typical real-time frame rates range from 10 Hz to 50 Hz. If the frame rate is 30 Hz, that means 30 frames are produced in one second. Faster frame rates are found with cardiac imaging> What component is necessary for a real-time B-mode scanner but is not present in A-mode scanner? A. Clock B. Transmitter C. Transducer D. Scan converter E. Receiver CORRECT ANSWERS: D. Scan converter You have increased the output power by 10 dB. The signal intensity has: A. Doubled B. Tripled C. Quadrupled D. Increased by a factor of 10 E. Increased by a factor of 100 CORRECT ANSWERS: D. Increased by a factor of 10 <Increasing a control by 3 dB corresponds to a doubling of the setting. If it is increased by 10 dB, it has been increased by a factor of 10> In this illustration, letter A is demonstrating what type of resolution? A. Axial B. Lateral C. Elevational D. Contrast E. Temporal CORRECT ANSWERS: B. Lateral What function of the receiver converts electric signals from radiofrequency to video form?