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A sufficient condition for spiral cone beam long object imaging via backprojection (2001).
| Content Provider | CiteSeerX |
|---|---|
| Author | Tam, K. C. |
| Abstract | The response of a point object in cone beam spiral scan is analysed. Based on the result a sufficient condition for the spiral scan long object problem employing backprojection is formulated. By making use of the sufficient condition a general class of exact, backprojection based reconstruction algorithms for spiral scan cone beam CT is developed which are capable of reconstructing a sectional ROI of the long object without contamination from overlaying materials using spiral scan cone beam data irradiating the particular ROI and its immediate vicinity only. Also, at each source position the minimum size of the region on the detector plane required for 3D backprojection is reduced, which in term brings about reduction in the amount of 3D backprojection computation. I. 2D filtering and masking Spiral scan computed tomography with large area detectors is of increasing interest for rapidly scanning spacious volumes. As the cone angle increases the artifacts generated in the reconstructed images by the approximate reconstruction algorithms will become more and more serious, and exact reconstruction algorithms are required. It is known that if the spiral path is long enough so that every plane intersecting the object also intersects the spiral path, the object can be reconstructed. For long objects, however, it is highly desirable to scan only the portion of the object that is of interest, for the sake of reduction in scan time as well as radiation protection of the patient in medical imaging. However, as a consequence of the divergent nature of the X-ray cone-beams different regions of the object are correlated. To reconstruct only a region-of-interest (ROI) from a spiral scan which covers the particular ROI and its immediate vicinity only poses a challenge for the imaging ... |
| File Format | |
| Publisher Date | 2001-01-01 |
| Access Restriction | Open |
| Subject Keyword | Sufficient Condition Particular Roi Spiral Path Long Object Immediate Vicinity Radiation Protection Scan Time Sectional Roi Point Object Spiral Scan Cone Beam Data Minimum Size Approximate Reconstruction Algorithm Reconstructed Image Reconstruction Algorithm Backprojection Computation Spacious Volume X-ray Cone-beams Different Region Detector Plane Exact Reconstruction Algorithm Divergent Nature Term Brings Medical Imaging Cone Angle General Class Spiral Scan Cone Beam Ct Cone Beam Spiral Scan Spiral Scan Large Area Detector Object Problem Source Position |
| Content Type | Text |
