Higher frequency _____ lateral resolution in the far field.

Higher frequency _____ lateral resolution in the far field.

• A. Degrades
• B. Improves
• C. Has no effect
• D. Varies with depth

Answer: (B)

Lateral resolution improves as the beam narrows with higher frequencies. The ability to distinguish side-by-side structures depends on how wide the ultrasound beam is; a higher frequency tone has a shorter wavelength, which lets the beam be focused more tightly. That narrower beam reduces blur in the far field, so two adjacent structures appear more separate. Keep in mind the trade-off: higher frequency also means more attenuation, so deeper targets may become harder to image due to weaker signals. Within the depths where the signal remains strong, the tighter beam directly enhances lateral detail. The other options don’t fit because a higher frequency does not degrade resolution or leave it unchanged; and while depth-related factors affect image quality, the fundamental effect of frequency is to sharpen lateral resolution.

Lateral resolution improves as the beam narrows with higher frequencies. The ability to distinguish side-by-side structures depends on how wide the ultrasound beam is; a higher frequency tone has a shorter wavelength, which lets the beam be focused more tightly. That narrower beam reduces blur in the far field, so two adjacent structures appear more separate.

Keep in mind the trade-off: higher frequency also means more attenuation, so deeper targets may become harder to image due to weaker signals. Within the depths where the signal remains strong, the tighter beam directly enhances lateral detail. The other options don’t fit because a higher frequency does not degrade resolution or leave it unchanged; and while depth-related factors affect image quality, the fundamental effect of frequency is to sharpen lateral resolution.