Medical Imaging Systems · Ultrasound Imaging · 2 marks · Multiple choice
An ultrasonic wave of incident pressure amplitude P₀ strikes a boundary normally from acoustic impedance Z₁ toward Z₂. What is the total pressure amplitude at the boundary on the incident side?
The pressure reflection coefficient is r=(Z₂−Z₁)/(Z₂+Z₁). At the boundary the incident and reflected pressures add, giving P₀(1+r)=P₀[(Z₁+Z₂+Z₂−Z₁)/(Z₁+Z₂)]=2P₀Z₂/(Z₁+Z₂). This matches A; B gives the reflected component alone.
More Ultrasound Imaging questions
GATE 2022 BM Q34– A PZT5A ultrasound transducer must resonate at 5 MHz. Sound speed in the crystal is 4350…
GATE 2021 BM Q51– A longitudinal ultrasound wave meets a muscle–kidney boundary at 60°. Acoustic impedances…
GATE 2021 BM Q65– A PZT crystal has thickness 1 mm and sound speed 4000 m/s. Its longitudinal ultrasound…
GATE 2020 BM Q17– A 5 MHz ultrasound pulse images a tumor 2 cm deep in soft tissue. Its round-trip echo time…
GATE 2020 BM Q52– A 3 MHz transducer sends a three-cycle pulse normally toward a fat–liver boundary. Use…
GATE 2026 BM Q22– Which is the correct decreasing order of ultrasound propagation speed?