MCQ2


1. The ultrasound machine compensates for the effects of tissue attenuation by using:




2. The TIb value sometimes displayed on the screen of an ultrasound machine refers to:




3. Doppler shifts below the baseline of the spectral display conventionally represent blood moving:




4. Shadowing in ultrasound images can be caused by the presence of:




5. The ultrasound machine ensures that the transmitted pulse is short because this:




6. Pulsed Doppler transmits relatively short pulses of ultrasound:




7. The width of the ultrasound beam at focus will decrease if:




8. The most commonly used type of probe for abdominal and obstetric imaging is:




9. In colour Doppler frequency aliasing occurs:




10. The progressive reduction in the energy of ultrasound as it passes through tissue is referred to as:




11. The term contrast resolution refers to:




12. Compared with spectral pulsed Doppler colour Doppler is:




13. The average propagation speed of ultrasound in soft tissue is:




14. The slice thickness (or elevation plane) of the ultrasound beam can cause:




15. Harmonic imaging is often used in conjunction with ultrasound contrast agents because it:




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