Physics (medical)
- Created by: Sophie Mcd
- Created on: 03-04-13 13:43
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- Medical applications of physics
- Xrays
- High frequency, short wavelength
- Used to form images of bones
- Checks for fractures and dental problems
- They destroy tumours near the body surface
- Can damage living tissue cells. This is ionisation. Can make cells become cancerous
- Workers wear led aprons to protect themselves from radiation from the X-Rays
- Ultrasound
- They are sound waves of frequency above 20 000 Hz
- Can be used in diagnosis and treatment
- Ultrasound waves are partly reflected at a boundary between two different types of body tissue.
- An ultrasound scan is non ionising so it's safer than x-rays
- The distance travelled by an ultrasound can be calculate using an equation.
- s = v x t
- s- distance travelled, m
- v- speed of ultrasound in metres per second, m/s
- t- time taken, s
- s = v x t
- Xrays
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