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5 Cards in this Set
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Digital Subtraction Angiography (DSA)
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an image constructed by superimposing a contrast image (usually blood-vessel network) with the normal x-ray image [which is subtracted].
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What is DSA used for?
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may show blood vessel blockages
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Describe the process of computerised tomography.
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A computer will create an image based on the quantified absorption at a specific point and angle. The more x-rays taken about the target, the higher the resolution.
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What values is a computer using to generate an image?
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Each pixel of a generated image is based on the measured linear attenuation coefficient
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Describe 3 methods of CT scanning.
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First generation - source and detector opposite from each other rotate around the patient.
Fourth generation - the x-ray source "sweeps" back and forth from one point Spiral - scan the length of the body to obtain many projections |
