ARDMS (American Registry for Diagnostic Medical Sonography) Practice Test

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Choose the type of transducer that lacks range resolution.

  1. Phased array

  2. Annular array

  3. Continuous wave (CW)

  4. Linear sequential array

The correct answer is: Continuous wave (CW)

Continuous wave (CW) transducers lack range resolution because they are constantly sending out a continuous beam of ultrasound without pausing to receive any echoes. They do not have the ability to distinguish between different depths or reflectors, so they cannot accurately determine the exact location of structures within the body. This is in contrast to phased array, annular array, and linear sequential array transducers which all use pulse-echo technology to send out and receive specific pulses of ultrasound, allowing for better range resolution and localization of structures.

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