System for improved compressive tomography and method therefor
First Claim
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1. A method for imaging an object, the method comprising:
- performing a first measurement of a physical phantom with a continuous illumination pattern;
selecting a first set of illumination rays that are discrete and non-continuous, wherein the first set of illumination rays are selected based on the first measurement;
interrogating the object with the first set of illumination rays, wherein the first set of illumination rays are generated by operations comprising;
(i) generating a second set of illumination rays that is a continuous set of illumination rays; and
(ii) filtering the second set of illumination rays at a coded aperture to prevent at least one illumination ray of the second set thereof from interrogating the object;
generating a dataset that includes values for the attenuation of each illumination ray of the first set thereof, the attenuation being based on the structure of the object along the path of the illumination ray; and
reconstructing an image of the object based on the dataset.
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Abstract
A method and system for forming tomographic images of an object using discrete, non-continuous illumination rays is disclosed. In some embodiments, coded apertures, collimation filters, or reference structures are used to filter the set of illumination rays from a two- or three-dimensional radiation signal, wherein the set of illumination rays are then used to interrogate the object. In some embodiments, the object is interrogated with a set of illumination rays that is continuous and a sparse array of detectors is used to sub-sample the illumination rays after they have passed through the object.
66 Citations
15 Claims
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1. A method for imaging an object, the method comprising:
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performing a first measurement of a physical phantom with a continuous illumination pattern; selecting a first set of illumination rays that are discrete and non-continuous, wherein the first set of illumination rays are selected based on the first measurement; interrogating the object with the first set of illumination rays, wherein the first set of illumination rays are generated by operations comprising; (i) generating a second set of illumination rays that is a continuous set of illumination rays; and (ii) filtering the second set of illumination rays at a coded aperture to prevent at least one illumination ray of the second set thereof from interrogating the object; generating a dataset that includes values for the attenuation of each illumination ray of the first set thereof, the attenuation being based on the structure of the object along the path of the illumination ray; and reconstructing an image of the object based on the dataset. - View Dependent Claims (2, 3, 4, 7, 13, 14)
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5. A method for imaging an object, the method comprising:
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performing a first measurement of a physical phantom with a continuous illumination pattern; selecting a first set of illumination rays that are discrete and non-continuous, wherein the first set of illumination rays are selected based on the first measurement; interrogating the object with the first set of illumination rays, wherein the first set of illumination rays are generated by operations comprising; (i) interrogating the object with a second set of illumination rays that is a continuous set of illumination rays that includes the first set of illumination rays; and (ii) subsampling the second set of illumination rays to select only the first set of illuminations rays for detection; generating a dataset that includes values for the attenuation of each illumination ray of the first set thereof, the attenuation being based on the structure of the object along the path of the illumination ray; and reconstructing an image of the object based on the dataset. - View Dependent Claims (6)
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8. A system for forming an image of an object, the system comprising:
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a source of radiation, the source being operative for providing a continuous illumination pattern; a first coded aperture that converts the continuous illumination pattern into a first set of illumination rays that are discrete and non-continuous, wherein the first set of illumination rays are selected based on a first measurement of a physical phantom using the continuous illumination pattern, and wherein the first coded aperture includes a first plurality of openings arranged in a first pattern code that is dimensioned and arranged to convert the continuous illumination pattern into the first set of illumination rays; a plurality of detectors, each detector of the plurality thereof being operative for detecting a different one of the first set of illumination rays; and a processor that is operative for determining the attenuation of each of the set of illumination rays due to interaction with the object. - View Dependent Claims (9, 10, 11, 12, 15)
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Specification