The reflection of ultrasound at a tissue interface is primarily determined by the difference in which property between the two tissues?
- A Density alone
- B Acoustic impedance ✓
- C Propagation speed alone
- D Attenuation coefficient
Correct answer: B. Acoustic impedance
Explanation
Acoustic impedance (Z = density × propagation speed) determines the amount of reflection at a tissue interface. A greater difference in acoustic impedance between two tissues results in stronger reflection. Options A and C are incomplete because impedance depends on both density and speed.
Reference: Diagnostic Ultrasound: Principles and Instruments, 8th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.