Cone beam CT scanning
OwnerMoshe Ein-Galinventor
Life of this patent
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Abstract
A CBCT system is described that includes a radiation source for emitting a cone beam of radiation in a beam direction towards an object, a detector for detecting the cone beam of radiation, and a positioner for moving the radiation source and the object according to a scanning trajectory. The system is operated according to a sampling pattern that includes intersections of the scanning trajectory and a reconstruction trajectory, wherein motion of the radiation source is substantially confined to a spherical shell. The positioner moves the radiation source at a speed higher than a highest speed of the object by a factor of at least 10. The largest angular discrepancy between any vector in a range of the scanning trajectory and the nearest sample of the scanning trajectory does not exceed 10°, preferably 6° and more preferably 3°.
Claims20
A cone beam computerized tomography (CBCT) system comprising:
- a radiation source for emitting a cone beam of radiation in a beam direction towards an object;
- a detector for detecting said cone beam of radiation;
- a positioner for moving said radiation source and said object according to a scanning trajectory;
- and
- a controller in communication with said positioner, said controller operable to operate said radiation source according to a sampling pattern that includes intersections of the scanning trajectory and a reconstruction trajectory,
- wherein motion of said radiation source is substantially confined to a spherical shell, and wherein said positioner is operable to move said radiation source at speed higher than a highest speed of the object by a factor of at least 10, and wherein a largest angular discrepancy between any vector in a range of the scanning trajectory and a nearest sample of the scanning trajectory does not exceed 10°.
A method for CBCT comprising:
- emitting a cone beam of radiation from a radiation source in a beam direction towards an object;
- detecting said cone beam of radiation with a detector;
- moving said radiation source and said object according to a scanning trajectory;
- and
- operating said radiation source according to a sampling pattern that includes intersections of the scanning trajectory and a reconstruction trajectory,
- wherein motion of said radiation source is substantially confined to a spherical shell, and wherein said radiation source is moved at speed higher than a highest speed of the object by a factor of at least 10, and wherein a largest angular discrepancy between any vector in a range of the scanning trajectory and a nearest sample of the scanning trajectory does not exceed 10°.
Dependencies are inferred from the claim text.