ARDMS SPI Practice Test A & B - Questions and Answers

ARDMS SPI Practice Test A & B - Questions and Answers Which parameter would change on a phantom test if the spatial pulse length were made longer? A. axial resolution B. lateral resolution C. horizontal distance resignation D. sensitivity If the ultrasound machine comes in contact with a patient’s body fluids, what should be done? A. remove the machine from use for the day B. use an approved disinfectant solution to clean it C. call the manufacturer to see what they would do Which parameter is most related to cavitation tissue? A. energy B. pressure C. duty factor D. pulse repetition frequency Which interface will cause the maximum reflection of the incident sound beam? A. fat/muscle B. soft tissue/bone C. fat/soft tissue D. soft tissue/lung Acoustic enhancement occurs distal to what? A. calcifications B. near field interface C. highly reflecting structure D. weakly attenuating structure As the pressure amplitude of ultrasound doubles, what happens to the wavelength? A. quadruples B. doubles C. halves D. unchanged What is the period of a 5 MHz ultrasound wave? A. 0.02 ms B. 0.2 ms C. .5mc D. 5ms What limits diagnostic application at higher frequencies? A. noise B. tissue penetration C. contrast resolution D. temporal resolution What is the function of a lens on a transducer? A. focus the beam B. increase the bandwidth C. shorten the pulse length D. provide damping What would improve axial resolution? A. increase the pulse repetition frequency B. reduce the receiver gain C. change the gray scale map D. increase the transducer frequency What is true of the far field? A. sound beam converges B. intensity is highest C. lateral resolution is best D. sound beam diverges What improves lateral resolution? A. decreasing the beam width B. increasing the pulse repetition frequency C. decreasing transmitted frequency D. decreasing the width of the field of view Which statement is true for a linear phased array transducer? A. line density increases with depth B. elements are all fired nearly simultaneously C. elements are fired in successive groups D. all scan lines are perpendicular to the face of the transducer Which artifact is commonly seen within cystic masses due to the finite dimensions of the ultrasound beam? A. duplication B. mirror image C. reverberation D. slice thickness Which technique utilizes frequency modulation of the transmitted pulse to improve signal to noise ratio? A. apodization B. panoramic imaging C. coded excitation D. spatial compounding What is varied to implement apodization? A. voltage applied to each element B. time delays between elements C. pulse length D. number of active elements What will produce no doppler shift at a receiver