1 July 1991 Simultaneous patient translation during CT scanning
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Abstract
This paper deals with methods of reducing the total time required to acquire the projection data for a set of contiguous CT images. Normally during the acquisition of a set of slices, the patient is held stationary during data collection and translated to the next axial location during an inter-scan delay. The authors will demonstrate, using computer simulations and scans of volunteers on a modified scanner, how acceptable image quality is achieved if the patient translation time is overlapped with data acquisition. If the concurrent patient translation is ignored, structured artifacts significantly degrade resulting reconstructions. A number of algorithms are presented to minimize the structured artifacts through the use of projection modulation using the data from individual and multiple slices. Comparison is made of the methods with respect to structured artifacts, noise, resolution and susceptibility to motion. Review of preliminary clinical feedback by a panel of radiologists has indicated that the residual image degradation is tolerable for selected applications when it is critical to acquire more slices in a patient breathing cycle than is possible with conventional scanning. The method is a useful protocol when some image quality can be traded for increased scan rate. Applications include increased contrast utilization and minimization of registration artifacts.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Carl R. Crawford, Kevin F. King, "Simultaneous patient translation during CT scanning", Proc. SPIE 1443, Medical Imaging V: Image Physics, (1 July 1991); doi: 10.1117/12.43443; https://doi.org/10.1117/12.43443
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