BREAST ARDMS EXAM REVIEW WITH COMPLETE SOLUTIONS

Average propagation speed through soft tissue - Correct Answer 1540m/s Tissues with greater density (bone) have a higher propagation speed causing structures to appear more - Correct Answer Superficial Tissues with lesser density (silicone implants) have lower propagation speeds causing structures to appear too - Correct Answer Deep Artifact caused by a difference in propagation speed causing structures to appear too superficial or deep - Correct Answer Propagation speed error Optimal transducer frequency for broad-bandwidth breast imaging - Correct Answer 10MHz (or 7.5-13MHz with a 1.5cm fixed elevation plane focus) Ability of a sono system to distinguish moving structures or dynamics over time - Correct Answer Temporal resolution What type of resolution is not affected by scanning superficial structures - Correct Answer Temporal resolution Relates to the amplitude of a transmitted voltage and affects the actual intensity of the beam - Correct Answer Output power Number of gray shades- measure of magnitude of signals - Correct Answer Dynamic range Expressed in decibels (dB) - Correct Answer Dynamic range Ratio of smallest to largest signal that a system can receive, process and display without disruption - Correct Answer Dynamic range Examiner can adjust dynamic range (shades of gray) with two settingsb - Correct Answer TGC and threshold compression settings A low amplitude signal is shown as - Correct Answer Black A high amplitude signal is shown as - Correct Answer White When a patient hums with power Doppler to distinguish a mass from normal tissue - Correct Answer Fremitus