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US 7,688,938 B2Granted
Method and apparatus for low dose computed tomography
AssigneeWisconsin Alumni Research Foundation
InventorsBhudatt R. Paliwal, Robert Jeraj, Ke Sheng
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Abstract
A computed tomography machine (1) provides for improved dose efficiency by calculating an optimized set of beam intensities to produce the desired image quality. Determination of the beam weights is based on an a priori modeling (53) of the properties of the patient being imaged.
Claims27
A computed tomography imaging machine comprising:
- a radiation source (16, 18) providing a radiation beam divisible into regions (30) being individually controllable in intensity;
- a radiation detector (28) for detecting the radiation from the radiation beam to produce attenuation signals;
- a patient support (22) supporting a patient between the radiation source and radiation detector;
- and
- a controller (40) holding a stored model (53) of the patient and controlling the intensities of the radiation beam in the different regions based on a contribution (60) by the radiation of the regions to a quality of a tomographic image as determined from the stored model.
2 more elements
A method of low dose tomographic imaging comprising:
- (a) providing a stored model (53) of a patient being imaged;
- (b) based on the stored model, controlling intensities of different of regions (30) within a radiation beam directed toward the patient (62) based on a calculated contribution (57) by the radiation of the regions to a quality of a tomographic image of the patient;
- and
- (c) reconstructing (66) an image of the patient using attenuation data collected at a detector (28) receiving the radiation beam after passage through the patient.
1 more element
Dependencies are inferred from the claim text.