The GATE Grind

GATE 2026 BM – Question 22

Medical Imaging Systems · Ultrasound Imaging · 1 mark · Multiple choice

Which is the correct decreasing order of ultrasound propagation speed?

  1. Bone > Air > Soft tissue
  2. Bone > Soft tissue > Air
  3. Air > Bone > Soft tissue
  4. Soft tissue > Bone > Air

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Correct answer: (B) Bone > Soft tissue > Air

Explanation

Sound speed depends on stiffness relative to density. Bone conducts ultrasound faster than ordinary soft tissue, while air conducts it much more slowly. Typical orders are several thousand metres per second in bone, about 1540 in soft tissue and about 340 in air. Thus B.

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