MCQ5


1. An advantage of spatial compound scanning is that it:




2. The period of an ultrasound wave is:




3. Doppler frequency aliasing can be reduced or eliminated by:




4. When the Doppler angle is reduced the Doppler shift:




5. The lateral resolution in an ultrasound image is determined by the:




6. Doppler shifted echoes from moving tissues are reduced by:




7. The purpose of the backing layer in a probe is to:




8. An ultrasound phantom usually contains tissue mimicking material that matches the following properties of average tissue:




9. The finite width of the ultrasound beam causes:




10. In Doppler ultrasound intrinsic spectral broadening is worse when:




11. The purpose of the persistence function in an ultrasound machine is to:




12. Speckle is the grainy appearance in an ultrasound image caused by:




13. In ultrasound imaging lateral resolution:




14. The ratio (S - D)/S (where S and D are the peak systolic and minimum diastolic blood velocities or Doppler shifts respectively) is called the:




15. If the ultrasound propagation speed in the tissues under examination is higher than the value assumed by the machine (1540 m/s) objects will be displayed in the image as being ________________ their true location.




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