Comprehensive and Detailed Explanation From Exact Extract:

Transmit focus narrows the ultrasound beam width at specific depths, improving lateral resolution — the ability to distinguish two objects side-by-side.

According to Principles and Instrumentation:

"Lateral resolution depends on beam width and is improved by focusing, which narrows the beam in the lateral dimension."

Axial resolution depends on pulse length.

Elevational resolution depends on slice thickness.

Temporal resolution relates to frame rate.

Therefore, the correct answer is C: Lateral.

QUESTION NO17

Which statement characterizes the primary difference between image A and image B?

A close-up of a medical scan Description automatically generated

A. Image A demonstrates a better axial resolution.

B. Image A demonstrates a lower overall gain setting.

C. Image A demonstrates a shallower field of view.

D. Image A demonstrates a wider scale of contrast.

Answer: B

Comprehensive and Detailed Explanation From Exact Extract:

In image A, the structures appear darker with less overall brightness compared to image B. This indicates that the overall gain (receiver amplification) is set lower in image A, resulting in a dimmer image. Gain controls how much the returning echoes are amplified after detection.

According to Principles and Instrumentation:

"Overall gain amplifies all returning echoes equally. A lower gain setting results in a darker image, while higher gain brightens the display."

Axial resolution (A) is primarily dependent on frequency and pulse length, not visible here.

Field of view (C) appears similar between both images.

Contrast scale (D) refers to dynamic range, not directly indicated here.

Therefore, the correct answer is B: Image A demonstrates a lower overall gain setting.

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