Imaging Modalities · NEET PG Preparation Radiology
In diagnostic ultrasound, acoustic impedance (Z) is defined as the product of tissue density and the speed of sound within that medium. When an ultra…
Practice question from Imaging Modalities (NEET PG Preparation Radiology), with the correct answer and a step-by-step solution.
hard · MCQ · Q-65A757
In diagnostic ultrasound, acoustic impedance (Z) is defined as the product of tissue density and the speed of sound within that medium. When an ultrasound beam encounters a boundary between two media with a large difference in acoustic impedance, what is the primary consequence?
- A.Complete absorption of the sound wave
- B.Large reflection and minimal transmissionCorrect answer
- C.Forward scattering without reflection
- D.Severe acoustic enhancement distal to the boundary
Solution
A large acoustic impedance mismatch between two media (such as soft tissue and bone, or soft tissue and air) results in a high reflection coefficient, meaning most of the sound wave is reflected back and very little is transmitted into the deeper tissues.
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