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Principles & Instrumentation part 1 (all solved), EXAM Questions & Answers

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Principles & Instrumentation part 1 (all solved), EXAM Questions & Answers-When using virtual beam forming the ultrasound beam is described as: A.) cylindrical B.) laster-thin C.) rectangular D.) high volume - laster-thin What part of the ultrasound system is responsible for changing the PRF with changes in image depth? A.) analog to digital scan converter B.) fast fourier transformer C.) digital to analog converter D.) pulser - pulser What is the best way to increase beam penetration? A.) Decrease operating frequency B.) Decrease compression C.) Increase output power D.) Increase rejection - Decrease operating frequency What system setting should be adjusted to better visualize the possible stone in the ureter posterior to the bladder? A.) increase the dynamic range B.) turn off spatial compounding C.) reduce the rejection settings D.) turn up the overall gain - turn off spatial compounding Activation of B-color is used to improve: A.) elevational resolution B.) spatial resolution C.) temporal resolution D.) contrast resolution - contrast resolution Pulse-echo systems use strength and _______ of the received signal to create the gray scale image. Magnitude and _________ of the received signal are used to create the Doppler display. A.) amplitude, location B.) magnitude, strength C.) time of flight, direction D.) intensity, luminance - time of flight, direction If a reflector is 5cm from the transducer, how long will it take a pulse to reach it? A.) 0.3msec B.) 0.03 msec C.) 0.6 msec D.) 0.06 msec - 0.03 msec Which of the following is a type of postprocessing that assigns shades of color, instead of grey, to create the image? A.) B color B.) Power Doppler C.) Contrast Enhanced Ultrasound D.) Color Doppler - B color The cine function on the ultrasound system: A.) is only available on a phased array B.) is a type of postprocessing C.) is used to improve temporal resolution D.) is performed by the pulser - is a type of postprocessing What part of the beam former creates the digital echo signal that is sent to the signal processor? A.) pulser B.) digital to analog converter C.) amplifier D.) analog to digital converter - analog to digital converter Increasing the sector size, increases: A.) the elevational resolution B.) the number of pulses per image C.)the temporal resolution D.) the frame rate - the number of pulses per image While scanning an echo, you change the gray map to a new choice and continue to scan. This would be termed a change in _______ A.) postprocessing B.) bandwidth C.) harmonic imaging D.) preprocessing - preprocessing All of the following are examples of imaging hardware, except: A.) radiology information system (RIS) B.) hard drive/disk drive C.) PACS system D.) flat screen LCD monitor - radiology information system (RIS)

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