X-ray imaging Radiography Photographic plate or digital detector X-ray machine X-rays absorbed by...

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X-ray imaging Radiography Photographic plate or digital detector X-ray machine X-rays absorbed by dense parts of patients body White indicates dense parts of body Grey indicates less dense regions Radiograph Patient image used with permission of Jens Langner, adapted from: http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-23509

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Transcript of X-ray imaging Radiography Photographic plate or digital detector X-ray machine X-rays absorbed by...

Page 1: X-ray imaging Radiography Photographic plate or digital detector X-ray machine X-rays absorbed by dense parts of patients body White indicates dense parts.

X-ray imaging

Radiography

Photographic plate ordigital detector

X-ray machine X-rays absorbed by dense parts of patients body

White indicates dense parts of body

Grey indicates less dense regions

Radiograph

Patient image used with permission of Jens Langner, adapted from:  http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-23509

Page 2: X-ray imaging Radiography Photographic plate or digital detector X-ray machine X-rays absorbed by dense parts of patients body White indicates dense parts.

X-ray imaging

X-rays

Radio wavesInfraredVisibleUltravioletX-rays/Gamma rays

Increasing wavelength

electrons

Cathode

Anode

X-rays

+

High voltage

Evacuated glass tube

Page 3: X-ray imaging Radiography Photographic plate or digital detector X-ray machine X-rays absorbed by dense parts of patients body White indicates dense parts.

X-ray imaging

Computerised tomography (CT)

Play

X-ray source

Detectors

Patient image used with permission of Jens Langner, adapted from:  http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-23509

Page 4: X-ray imaging Radiography Photographic plate or digital detector X-ray machine X-rays absorbed by dense parts of patients body White indicates dense parts.

X-ray imaging

X-ray dose

Effective dose 0.02 mSv 6.6 mSv

Equivalent background exposure 3.5 days  3.1 years

Ionisation Chest radiograph Chest CT image

Sources of background radiation (UK)

Radon gas from ground

Food and drink

Buildings and the ground

Medical X-rays

Cosmic rays

Schools and colleges lecture


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