X-rays, Ultrasound, Endoscope, Refraction
- Created by: Lizzi
- Created on: 19-05-13 17:35
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- X-rays, Ultrasound, Endoscope, Refraction
- X-rays and ultrasound
- X-rays used to: make images (on photographic paper)and CT scans; to destroy tumours near the surface
- X-rays can damage living tissue whilst passing through (ionisation)
- X-rays are more absorbed by bones and teeth than by tissue
- Ultrasound waves are above 20000Hz, so can't be heard
- Ultrasound can be used for diagnosis and treatment
- U.S waves are partly reflected at the boundary of two body tissues
- U.S is non-ionising so safer X-rays
- Refraction (Index)
- the light direction change as it passes from one substance into another
- takes place due to change of speed
- Refraction index = sin i/ sin r
- Endoscope
- Use total internal reflection: when the angle of incidence is increased beyond the the critical angle
- Used to see inside the body, either without surgery or with keyhole surgery
- Contains thin optical fibres
- Used for procedures like cutting, cauterisation,and burning. Laser light is also used for eye surgery
- refractive index = 1/sinC
- X-rays and ultrasound
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