Link to our latest notes and resources: https://drive.google.com/drive/u/2/folders/15FnZdp3NJ15WmXnkrSWgi5ltd5rUI9Bg 24 Medical physics 24.1 Production and use of ultrasound Candidates should be able to: 1 2 3 4 5 6 understand that a piezo-electric crystal changes shape when a p.d. is applied across it and that the crystal generates an e.m.f. when its shape changes understand how ultrasound waves are generated and detected by a piezoelectric transducer understand how the reflection of pulses of ultrasound at boundaries between tissues can be used to obtain diagnostic information about internal structures define the specific acoustic impedance of a medium as Z = ρc, where c is the speed of sound in the medium use IR / I0 = (Z1 – Z2 )2 / (Z1 + Z2 )2 for the intensity reflection coefficient of a boundary between two media recall and use I = I0 e–μx for the attenuation of ultrasound in matter 24.2 Production and use of X-rays Candidates should be able to: 1 2 3 4 explain that X-r

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