Radiation tomography apparatus and program for cardiac-gated imaging
First Claim
1. A radiation tomography apparatus for performing cardiac-gated imaging on a subject using a data collection system comprising a radiation source and a detector rotating around said subject, said radiation tomography apparatus comprising:
- a master controller including a scan control section for controlling said data collection system to acquire first scan data by a first scan for scanning a first scan region centering on a first position of said subject in a body axis direction in synchronization with heartbeats of said subject, and acquire second scan data by a second scan for scanning a second scan region adjacent to or partially overlapping said first scan region and centering on a second position of said subject in a body axis direction in synchronization with heartbeats of said subject; and
a data processing apparatus including a reconstructing section for reconstructing an image corresponding to a slice between said first position and said second position using said first and second scan data, said reconstructing section determining a view-angle-range-based use rate for said first scan data and a view-angle-range-based use rate for said second scan data according to a position of said slice relative to said first and second positions;
wherein said reconstructing section lowers the view-angle-range-based use rate for said second scan data for a position of said slice closer to said first position, and lowers the view-angle-range-based use rate for said first scan data for a position of said slice closer to said second position; and
wherein when the view-angle-range-based use rate for said first scan data or the second scan data is lower than 100%, data over a part of a view angle range corresponding to the first scan data or the second scan data, respectively, is used to reconstruct the image, but data over the other part of the view angle range is not used to reconstruct the image.
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Accused Products
Abstract
A radiation tomography system is provided that includes a control unit to control a data collection system to acquire first data by scanning a first scan region centered on a first position in a body axis direction of a subject in synchronization with heartbeats, and second data by scanning a second scan region adjacent to the first scan region and centered on a second position in the body axis direction in synchronization with the heartbeats. A reconstructing unit is provided to reconstruct an image of a slice between the first position and second positions using the first and second data. The reconstructing unit determines a view-angle-range-based use rate for the first data and a view-angle-range-based use rate for the second data according to the position of the slice relative to the first and second positions.
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Citations
9 Claims
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1. A radiation tomography apparatus for performing cardiac-gated imaging on a subject using a data collection system comprising a radiation source and a detector rotating around said subject, said radiation tomography apparatus comprising:
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a master controller including a scan control section for controlling said data collection system to acquire first scan data by a first scan for scanning a first scan region centering on a first position of said subject in a body axis direction in synchronization with heartbeats of said subject, and acquire second scan data by a second scan for scanning a second scan region adjacent to or partially overlapping said first scan region and centering on a second position of said subject in a body axis direction in synchronization with heartbeats of said subject; and a data processing apparatus including a reconstructing section for reconstructing an image corresponding to a slice between said first position and said second position using said first and second scan data, said reconstructing section determining a view-angle-range-based use rate for said first scan data and a view-angle-range-based use rate for said second scan data according to a position of said slice relative to said first and second positions; wherein said reconstructing section lowers the view-angle-range-based use rate for said second scan data for a position of said slice closer to said first position, and lowers the view-angle-range-based use rate for said first scan data for a position of said slice closer to said second position; and wherein when the view-angle-range-based use rate for said first scan data or the second scan data is lower than 100%, data over a part of a view angle range corresponding to the first scan data or the second scan data, respectively, is used to reconstruct the image, but data over the other part of the view angle range is not used to reconstruct the image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A non-transitory computer-readable medium storing a program that, when executed by a computer, causes the computer to generate signals to:
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control a data collection system of a radiation tomography apparatus to acquire first scan data by a first scan for scanning a first scan region centering on a first position of a subject in a body axis direction in synchronization with heartbeats of said subject, and to acquire second scan data by a second scan for scanning a second scan region adjacent to or partially overlapping said first scan region and centering on a second position of said subject in a body axis direction in synchronization with heartbeats of said subject; and reconstruct an image corresponding to a slice between said first position and said second position using said first and second scan data, and to determine a view-angle-range-based use rate for said first scan data and a view-angle-range-based use rate for said second scan data according to a position of said slice relative to said first and second positions; wherein said first position of said first scan is 180 degrees from said second position of said second scan; and wherein when the view-angle-range-based use rate for said first scan data or the second scan data is lower than 100%, data over a part of a view angle range corresponding to the first scan data or the second scan data, respectively, is used to reconstruct the image, but data over the other part of the view angle range is not used to reconstruct the image.
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Specification