Moving beam helical CT scanning
- Analogic Corp., Peabody, MA (United States)
- GE Medical Systems, Milwaukee, WI (United States)
Images generated with helical scanning are degraded by partial volume artifacts caused by an increased slice thickness when compared to conventional computed tomography (CT) scanning. The slice thickness for a helical scan is proportional to the sum of the thickness of the fan of radiation and the distance the patient moves during data acquisition. The authors present a method called moving beam helical scanning (MBHS) which significantly reduces the partial volume artifacts caused by helical scanning. The key element of MBHS is a rotatable collimator that is placed between the X-ray source and the patient. As the patient is translated, the collimator is used to aim the fan on a fixed position in the patient. Once sufficient data are obtained to reconstruct a slice, the collimator is quickly reset to scan a target in the next slice. The authors examined the performance of MBHS by scanning wires and phantoms on a modified scanner. The full-width-at-tenth-maximum of the slice profile at iso-center for MBHS is identical to conventional CT versus a 59% increase for conventional helical scanning. They conclude that MBHS can be used to obtain the scan rate advantages of helical scanning with image quality comparable to conventional scanning.
- OSTI ID:
- 227872
- Journal Information:
- IEEE Transactions on Medical Imaging, Journal Name: IEEE Transactions on Medical Imaging Journal Issue: 2 Vol. 15; ISSN 0278-0062; ISSN ITMID4
- Country of Publication:
- United States
- Language:
- English
Similar Records
Gated CT imaging using a free-breathing respiration signal from flow-volume spirometry
Truncated-view artifacts: clinical importance on CT