Ultrasound is a longitudinal wave with a frequency greater than 20kHz. It is non-ionising, non-invasive and quick. Ultrasound used in medical imaging typically has frequencies of 1-15MHz, arriving in pulses with a frequency of 5kHz. It is generated and detected by...
X-rays are high energy photons with short wavelengths, range 10-8 to 10-13m. They are produced in X-ray tubes: Evacuated tube containing two electrodes (evacuated so electrons pass through without interacting with gas atoms) An external power supply is used to create...
Medical tracers such as technetium-99m and fluorine-18 can be used as diagnostic tools. Inject tracer (into bloodstream) Taken up by organ or shows blockage By emitting radiation detected by camera More specifically, tracers may be used to: Monitor blood flow in...