Medical Imaging

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  • Created by: emmaxjmw
  • Created on: 02-05-16 09:14
Where is the body part being scanned placed during an X-Ray?
Between the X-Ray machine and photographic paper
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What does the X-Ray machine send through your body to reflect your internal structure?
Electromagnetic waves (ionising radiation)
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Why do bones, tumors and other dense matter appear white on X-Ray film?
They are opaque, meaning that they absorb the radiation
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Why do soft tissues and breaks in the bones show up darker on X-Ray film?
They let radiation through
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What are three advantages of using X-Rays?
Good bone resolution, Can be interpreted by a non-radiologist, Quick and cheap to carry out
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What are three disadvantages of using X-Rays?
Poor soft tissue resolution, 2D images, Ionising radition is harmful
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In an MRI scan, what is created by passing electrical currents through wire loops?
A strong magnetic feild
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What triggers Protons in the body to align themselves in an MRI scan?
Other coils in the magnet sending and recieving radio waves
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What do the Protons do once aligned in an MRI scan?
They absorb radio waves. This stimulates spinning
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What signals are picked up by the coils in an MRI scan?
Light energy signals from energy released after 'exciting' the molecules
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What does the computer do during an MRI scan?
It processes the signals and makes them into an image. This creates a 3-D image of the area being examined
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What are three advantages of using MRI scans?
3D images, Excellent soft tissue resolution, Doesn't involve radiation
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What are three disadvantages of using MRI scans?
Cannot scan patients with metal implants, Unsuitable for claustrophobic or obese patients, High cost
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What equipment is used during a CT scan?
A rotating X-Ray tube
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When the patient is moved through the beam in a CT scan, what are the series of images called?
Tomograms
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What do CT scans show that other scans don't?
Clear pictures of organs and blood vessels
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What are three advantages of using a CT scan?
3D images, Provides more detailed images (especially soft tissue), More readily available that other scans
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What are three disadvantages of using a CT scan?
Children and/or claustrophobic patients may need sedation as the patients must stay very still, High cost, Very high radiation dose
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During an ultrasound scan, what is the probe used for?
Transmitting and recieving ultrasound
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Why is a gel used to fill the gap between the probe and the skin during an ultrasound scan?
To prevent the ultrasound reflecting off the surface of the skin
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What is picked up by the probe in an ultrasound scan?
The echo patter of the returning waves after they have reflected off organs, soft tissue, or other barriers
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What is an ultrasound scan veiwed on a monitor as?
A real time picture
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What are three advantages of using an ultrasound scan?
Does not involve ionising radiation, Good soft tissue resolution, Relatively cheap
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What are two disadvantages of using an ultrasound scan?
Cannot see through bone, cannot see air filled spaces, such as lungs, because the sound waves are reflected at the tissue surface
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Other cards in this set

Card 2

Front

What does the X-Ray machine send through your body to reflect your internal structure?

Back

Electromagnetic waves (ionising radiation)

Card 3

Front

Why do bones, tumors and other dense matter appear white on X-Ray film?

Back

Preview of the front of card 3

Card 4

Front

Why do soft tissues and breaks in the bones show up darker on X-Ray film?

Back

Preview of the front of card 4

Card 5

Front

What are three advantages of using X-Rays?

Back

Preview of the front of card 5
View more cards

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