Physics 7408: Medical Physics(OPTION) Topical Past Paper Questions

Figure 2 shows a transducer used in a medical ultrasound scanner. Figure 2 Explain why a backing material is used. A beam of ultrasound is transmitted from muscle into bone. Calculate the percentage of the incident intensity that is transmitted. acoustic impedance of bone = $ 5.3…

1 Figure 6 shows an X-ray image of a chest on photographic film. Figure 7 shows a diagram of a horizontal cross-section of the chest along the dashed line in Figure 6. Figure 6 Figure 7 Discuss the half-value thicknesses of the labelled body parts relative to each other. In your…

1 State the purpose of the magnetic field in a magnetic resonance scanner. [1 mark] 2 Describe the role of the radio frequency pulses in a magnetic resonance scanner. [2 marks]