SPI Exam Dumps | What is the primary purpose of backing material in transducers?

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Question 35/99

What is the primary purpose of backing material in transducers?

A. Improving axial resolution

B. Increasing the number of cycles in a pulse

C. Preventing electrical shock to the operator or patient

D. Improving acoustic impedance matching

Correct Answer: A

* The backing material, also known as damping material, in an ultrasound transducer serves to dampen the vibrations of the piezoelectric crystal.
* This damping reduces the number of cycles in each pulse, leading to a shorter spatial pulse length (SPL).
* Shorter SPL improves axial resolution by allowing the system to better distinguish between two closely spaced structures along the axis of the ultrasound beam.
* Improved axial resolution is crucial for producing clearer, more detailed images.References:
* ARDMS Sonography Principles and Instrumentation guidelines on transducer design and the role of backing material in image quality.

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