ARDMS Ultrasound Physics & Instrumentation Practice Exam

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Prepare for the ARDMS Ultrasound Physics and Instrumentation Exam with our interactive quizzes. Use flashcards and multiple choice questions, detailed explanations made to enhance understanding and confidence. Start your journey today!

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Which of the following materials has the lowest propagation speed?

Liquid
Bone
Lung tissue
Soft tissue

The correct answer is: Lung tissue

The lowest propagation speed in ultrasound is found in lung tissue due to its unique structure, which consists of both air-filled spaces and soft tissue. The presence of air significantly decreases the speed of sound compared to other uniform mediums like soft tissues, bone, and liquids. Sound waves travel faster in denser materials; therefore, the density and the nature of lung tissue make it a less effective conductor for ultrasound waves, resulting in lower propagation speed. Bone, being very dense, has one of the highest sound propagation speeds, while soft tissue and fluids have intermediate speeds. This context makes lung tissue the correct choice for the option with the lowest propagation speed when compared to the other materials provided.