GATE Medical Imaging Systems: Ultrasound Imaging – Previous Year Questions

13 GATE previous year questions on Ultrasound Imaging (Medical Imaging Systems, Biomedical Engineering) with answers and explanations, from every paper.

1. GATE 2020 BM Q17 (1 mark, Multiple choice) – A 5 MHz ultrasound pulse images a tumor 2 cm deep in soft tissue. Its round-trip echo time is t. If frequency changes to 2.5 MHz, what is the echo…
2. GATE 2020 BM Q52 (2 marks, Multiple choice) – A 3 MHz transducer sends a three-cycle pulse normally toward a fat–liver boundary. Use tissue speed 1500 m/s, fat speed 1450 m/s,liver speed 1570 m/s,…
3. GATE 2021 BM Q51 (2 marks, Multiple choice) – A longitudinal ultrasound wave meets a muscle–kidney boundary at 60°. Acoustic impedances are 1.70×10⁵ and 1.62×10⁵ g cm⁻² s⁻¹; sound speeds are 1590…
4. GATE 2021 BM Q65 (2 marks, Numerical answer) – A PZT crystal has thickness 1 mm and sound speed 4000 m/s. Its longitudinal ultrasound beam meets blood flow at 30°. Blood speed is 10 cm/s and tissue…
5. GATE 2022 BM Q34 (1 mark, Numerical answer) – A PZT5A ultrasound transducer must resonate at 5 MHz. Sound speed in the crystal is 4350 m/s. Find the required thickness in mm to three decimals.
6. GATE 2023 BM Q35 (1 mark, Numerical answer) – A 5 MHz ultrasound transducer measures blood velocity using an echo frequency shift of 200 Hz. The beam makes 45° with blood flow, and sound speed is…
7. GATE 2023 BM Q45 (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…
8. GATE 2024 BM Q34 (1 mark, Numerical answer) – A 5 MHz Doppler probe measures maximum shift 3 kHz at 45° to blood flow. Sound speed in blood is 1500 m/s. Find maximum flow velocity to two decimals…
9. GATE 2024 BM Q55 (2 marks, Numerical answer) – A circular ultrasound transducer has radius a=8 mm,frequency 1 MHz,and axial pressure P(r,0)(ka2/(4r)). Sound speed is 1600 m/s. Find positive…
10. GATE 2025 BM Q43 (2 marks, Multiple select) – Which statements about ultrasound are true?
11. GATE 2026 BM Q22 (1 mark, Multiple choice) – Which is the correct decreasing order of ultrasound propagation speed?
12. GATE 2026 BM Q45 (2 marks, Multiple choice) – An ultrasound wave is normally incident from muscle onto bone. Their acoustic impedances are 1.710-4 and 6.110-4 kg m⁻² s⁻¹ respectively, as printed…
13. GATE 2026 BM Q46 (2 marks, Multiple choice) – An ultrasound beam travels 5 cm through material attenuating it by 2 dB/cm. Find exit intensity divided by entry intensity.