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What action below would be most in keeping with the ALARA principle while performing a diagnostic ultrasound examination? A: Allow multiple students to scan an obstetrical patient because the fetus is in a good position for imaging. B: Prolong the sonogram to make videos of the fetus for each family member. C: Complete the diagnostic scan in a timely fashion at the lowest output power that achieves a quality image. D: Maximize the acoustic output to brighten the overall image. E: Extend...

In order for distance measurements to be accurate in an ultrasound tissue phantom, the phantom sound propagation speed must be: A: 13 us/cm B: 1.54 m/s C: 154o m/s D: 1/2 the speed of sound in tissue E: Twice the speed of sound in soft tissue CORRECT ANSWERS: C: 1540 m/s You expanded the image sector width to improve visualization of a large mass. What can you do to maintain the same temporal resolution you had before your adjustment? A: Increase the digitization bit depth B: In...

You have increased the transmit power while performing a pelvic ultrasound examination. This action increases which of the following? A. Penetration B. Acoustic power C. Image brightness D. Voltage applied to the transducer elements E. All of the above CORRECT ANSWERS: E. All of the above Attenuation of the sound beam increases with increasing: A. Path length B. Absorption C. Frequency D. Scattering and reflection E. All of the above CORRECT ANSWERS: E. All of the above ...

Interference patterns of reflected waves causes? CORRECT ANSWERS: acoustic speckle which of the following terms denotes the time it takes for one cycle to occur? CORRECT ANSWERS: Period which of the following increases as frequency increases? CORRECT ANSWERS: absorption scattering attenuation What is meant by the dead zone in performance testing? CORRECT ANSWERS: Distance from the transducer to the first identifiable echo. What sound-tissue interaction is necessary to form an u...

Will not cause a redirection of part of the ultrasound energy CORRECT ANSWERS: absorption You are scanning a large mass composed primarily of fat. What will you most likely encounter? CORRECT ANSWERS: axial misregistration of object distal to the mass on the screen due to the slower propagation speed through fat What 2 conditions must be present to cause a refraction in soundwave? CORRECT ANSWERS: oblique incidence and change in propagation speed What may be detected with refraction...

What action below would be most in keeping with the ALARA principle while performing a diagnostic ultrasound examination? A. Allow multiple students to scan an obstetrical patient because the fetus is in a good position for imaging. B. Prolong the sonogram to make videos of the fetus for each family member. C. Complete the diagnostic scan in a timely fashion at the lowest output power that achieves a quality image. D. Maximum the acoustic output to brighten the overall image. E. E...

This converter converts the numbers stored in memory to proportional voltages that control the brightness on a CRT monitor CORRECT ANSWERS: Digital to Analog Converter The Digital Scan Converter is AKA: CORRECT ANSWERS: Image Memory This is where images are stored in the ultrasound system: CORRECT ANSWERS: Scan Converter The system component which is most responsible for transmit focusing: CORRECT ANSWERS: Beam Former The process of filling in the empty spaces between scan lines:...

Which of the following helps to improve the elevation resolution to B- mode image? correct answers Focusing with and acoustic lens During and exam, you encounter all of the interactions of ultrasound and tissue listed. Which one will NOT cause redirection of part of the ultrasound energy? correct answers Absorption When you adjust the TGC component of the ultrasound system implements the changes? correct answers Receiver Which is NOT true about lateral resolution? correct an...

What action below would be most in keeping with the ALARA principle while performing a diagnostic ultrasound examination? A: Allow multiple students to scan an obstetrical patient because the fetus is in a good position for imaging. B: Prolong the sonogram to make videos of the fetus for each family member. C: Complete the diagnostic scan in a timely fashion at the lowest output power that achieves a quality image. D: Maximize the acoustic output to brighten the overall image. E: Extend...

All numerical values should have corresponding _____. CORRECT ANSWERS: units An ______ tool can be used to measure area CORRECT ANSWERS: ellipse _________ is not a unit. CORRECT ANSWERS: Percent Giga CORRECT ANSWERS: billion 10^9 G micro CORRECT ANSWERS: millionth 10^-6 How many hertz is 3MHz? a. 3,000,000 b. 3,000 c. 333 d. 0.003 CORRECT ANSWERS: 3,000,000 How much bigger is a billion than a million? a. 10 times b. 100 times c. 1,000 times d. 500 times CORREC...