Dose control in ct-images
First Claim
1. A method for determining a modulation function for modulating intensity of X-rays provided by an X-ray source of a CT-system for CT-imaging a slice of a region a person'"'"'s body, the method comprising:
- acquiring X-ray attenuation data for a first substantially anterior-posterior or lateral view of the slice;
determining a first maximum X-ray attenuation from the attenuation data;
determining a length of a projection of the slice along an axis in the plane of the slice that is substantially orthogonal to the view angle using the attenuation data;
determining a second maximum X-ray attenuation for a second view orthogonal to the first view based on the determined length; and
using the first and second attenuation maxima to determine the modulation function.
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Abstract
A method for determining a modulation function for modulating intensity of X-rays provided by an X-ray source of a CT-system for CT-imaging a slice of a region a person'"'"'s body, the method comprising: acquiring X-ray attenuation data for a first substantially anterior-posterior or lateral view of the slice; determining a first maximum X-ray attenuation from the attenuation data; determining a length of a projection of the slice along an axis in the plane of the slice that is substantially orthogonal to the view angle using the attenuation data; determining a second maximum X-ray attenuation for a second view orthogonal to the first view based on the determined length; and using the first and second attenuation maxima to determine the modulation function.
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Citations
12 Claims
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1. A method for determining a modulation function for modulating intensity of X-rays provided by an X-ray source of a CT-system for CT-imaging a slice of a region a person'"'"'s body, the method comprising:
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acquiring X-ray attenuation data for a first substantially anterior-posterior or lateral view of the slice;
determining a first maximum X-ray attenuation from the attenuation data;
determining a length of a projection of the slice along an axis in the plane of the slice that is substantially orthogonal to the view angle using the attenuation data;
determining a second maximum X-ray attenuation for a second view orthogonal to the first view based on the determined length; and
using the first and second attenuation maxima to determine the modulation function. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of performing a planar scan of a region of a person'"'"'s body utilizing a CT imager to acquire a planar view of each of a plurality of slices of the region comprising:
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illuminating each of the slices in the region with X-rays one after the other in order of their axial location along the body to acquire attenuation data for a planar view of each slice; and
modulating intensity of X-rays used to illuminate the slices as a function of axial position to reduce exposure of the patient to X-ray radiation. - View Dependent Claims (10, 11, 12)
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Specification