Ultrasound Physics II Practice Exam

Higher line density has what effect on spatial information?

Increases spatial information Decreases spatial information No effect on spatial information Only affects depth penetration

Correct Answer:

Increases spatial information

Explanation:

Higher line density means more scan lines across a given area, so the tissue is sampled more finely. Each line carries depth echoes, and with more lines in the same region there are more samples of the structures, allowing smaller details and closer boundaries to be distinguished. That richer sampling translates directly into greater spatial information. Depth penetration depends mainly on frequency and attenuation, not line density, so increasing line density improves detail rather than inherent imaging depth. (Note: higher line density can reduce frame rate, a trade-off to keep in mind.)

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