Method and apparatus for positioning an object with respect to the isocenter of an acquisition system
First Claim
1. A method for positioning an object at an isocenter of an imaging system, said method comprising:
- acquiring two x-ray projections in an imaging system;
emitting a magnetic field using an electromagnetic emitter;
detecting the magnetic field using an electromagnetic receiver;
determining an isocenter for the imaging system using the two x-ray projections and information from the electromagnetic receiver;
locating a center position of an object to be imaged using information from the electromagnetic receiver, wherein at least one of the electromagnetic emitter and the electromagnetic receiver is located on the object to be imaged; and
positioning the center position of the object with respect to the isocenter.
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Accused Products
Abstract
Certain embodiments of the present invention relate to a system and method for object and isocenter alignment in an imaging system. The system includes an electromagnetic, an electromagnetic receiver, and an imaging unit for determining an isocenter of an imaging scanner based on information from the electromagnetic receiver. The imaging unit identifies the isocenter based on a plurality of electromagnetic position measurements. The imaging unit identifies a center of an object to be imaged based on information from a second electromagnetic receiver. The imaging unit repositions the object based on the isocenter. In an embodiment, the emitter is located on the object, the first receiver is located on a detector, and the second receiver is located on a tool for identifying a center of the object or a portion of the object.
14 Citations
20 Claims
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1. A method for positioning an object at an isocenter of an imaging system, said method comprising:
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acquiring two x-ray projections in an imaging system; emitting a magnetic field using an electromagnetic emitter; detecting the magnetic field using an electromagnetic receiver; determining an isocenter for the imaging system using the two x-ray projections and information from the electromagnetic receiver; locating a center position of an object to be imaged using information from the electromagnetic receiver, wherein at least one of the electromagnetic emitter and the electromagnetic receiver is located on the object to be imaged; and positioning the center position of the object with respect to the isocenter. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for centering an object in an imaging system, said method comprising:
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acquiring at least three position measurements for an electromagnetic receiver in an imaging system, wherein the electromagnetic receiver is configured to detect a magnetic field and the electromagnetic receiver is located on a detector of the imaging system; and computing an isocenter with respect to an electromagnetic emitter using the at least three position measurements, wherein the electromagnetic emitter is configured to emit a magnetic field. - View Dependent Claims (9, 10, 11, 12)
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13. A method for determining a working position for tomographic reconstruction, said method comprising:
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calculating an approximate focal distance in an imaging system; determining position and orientation information for an electromagnetic receiver with respect to an electromagnetic emitter in the imaging system, wherein the electromagnetic emitter is configured to emit a magnetic field and the electromagnetic receiver is configured to detect the magnetic field, and wherein at least one of the electromagnetic emitter and the electromagnetic receiver is located on an object to be imaged; and identifying an isocenter for the imaging system using the position and orientation information and approximate focal distance. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification