PhysicsChapter 11: Medical Imaging
How Ct Scanning Works
Computed tomography (CT)
Definition
Computed tomography (CT) uses X-ray measurements from many directions and computer reconstruction to produce cross-sectional images of the body.
Formula / Key Relation
In a CT scanner: 1. An X-ray source rotates around the patient. 2. Detectors measure transmitted X-ray intensity. 3. Measurements are obtained from many angles. 4. A computer processes the projection data. 5. A cross-sectional image is reconstructed. Each small image element corresponds to information about X-ray attenuation in a small region of the body. Multiple slices can be combined to provide detailed three-dimensional information. Underlying attenuation: **I = I₀e(−μx) Conceptually: many projections → reconstruction → cross-sectional image**
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Review the key facts, formulas and checks before you move on.How Ct Scanning Works
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CT
- Rotate source
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- Many projections
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- Computer reconstruction
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- Slice
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- CT reconstructs cross-sectional images from many X-ray projections.
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