ARDMS (American Registry for Diagnostic Medical Sonography) Practice Test

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The amount of divergence that occurs in the far field is determined by the sound wave's frequency and which component?

Line density
Focal zone depth
Diameter of the crystal
Speed

The correct answer is: Diameter of the crystal

In ultrasound imaging, the amount of divergence that occurs in the far field is determined by the sound wave's frequency and the diameter of the crystal. The diameter of the crystal affects how the soundwaves spread out as they propagate away from the transducer, influencing the focus and resolution of the image produced. Therefore, option C is the correct answer in this case. Options A, B, and D are incorrect: A. Line density is not a factor that directly determines the amount of divergence in the far field. B. Focal zone depth is related to the focusing capabilities of the transducer but does not directly affect the divergence in the far field. D. Speed is important in determining the propagation speed of sound waves, but it is not the main component that determines the amount of divergence in the far field.