In diagnostic ultrasound, lateral resolution (the ability to distinguish two structures perpendicular to the beam axis) is primarily determined by:

• A The pulse length of the transmitted ultrasound wave
• B The time gain compensation settings
• C The frequency of the transducer
• D The width of the ultrasound beam ✓

Explanation

Lateral resolution is determined by the width of the ultrasound beam; a narrower beam provides better lateral resolution. Option A determines axial resolution (along the beam axis). Option C affects both resolution types but is not the primary determinant of lateral resolution. Option B compensates for attenuation but does not affect resolution.

Reference: Diagnostic Ultrasound: Principles and Instruments, 8th ed.

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Written and medically reviewed by the StethoPrep medical team.