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Mind map on the various non-invasive medical imaging methods. Used to revise for subjects like physics and applied science.
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, updated more than 1 year ago
about 9 years ago
Radiography (xray imaging)
Best for broken bones, dentistry & some soft tissues.
Photographic film and xray Generator. Rays expose film and turn it black.
No rays reached paper = white (bones and metal show up as white)
Xrays are ionising and exposure has to be kept to a minimum.
Xrays have contrasting agents that can boost attenuation coefficient of soft tissues - better distinguishing of soft tissues - in the form of an artifical contrast medium
In the digestive system, barium is given containing barium sulfate to identify stomach/intestinal blockages.
CAT Scanning - computer tomography
Produces more detailed picture than xray by putting the image together using a computer.
Consists of a rotating x-ray source and a ring of detectors surrounding the patient. Data produced builds up a detailed cross sectional image
CAT scan has 100X more ionising radiation than xray to be built up into a 3D image
This means that the patient is limited to the amount of CAT scans they can have, and it also puts the radiographer at risk.
MRI scanning - magnetic resonance imaging
Carries no known risks
Not good for young children/claustrophobes
Some patients may need sedation or restraint
Ring-shaped electromagnets that line the MRI unit
When switched on protons in the body (from hydrogen atoms) line up in the electromagnetic field
once lined up a radio frequency is emitted which disturbs proton alignment and causes them to rotate, emitting tiny radio frequency signals.
Expensive - maintenance of machine and supply of helium to be made into liquid helium to keep the electromagnetic coil cold is very costly.
Small radio frequency coil is used to cover relevant parts of the body to pick up signals from resonating protons, which allows them to then be converted into an image
Not appropriate for patients with metal implants
Term used to describe any method used to view the inside of the body without invasive surgery
Ultra sound scanning
Uses high frequency sound emitted from a transceiver unit, which rebounds off of tissue
Gel has to be used so that air gaps do not disrupt the signal
Cheap - only needs one unit
Means it is accessible to LEDCs.
Useful in prenatal scans as is can detect deformities without invasive testing which could be harmful to the baby
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