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Computed tomography scanning with simultaneous patient translation
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1990
Year
Computed TomographyImage ReconstructionEngineeringDiagnosisSurgeryDual-source CtTotal TimeImage AnalysisData AcquisitionCt ScanPhoton-counting Computed TomographyNuclear MedicineRadiologySimultaneous Patient TranslationResidual Image DegradationReconstruction TechniqueMedical ImagingInverse ProblemsMedical Image ComputingComputer VisionBiomedical ImagingMedicine
In conventional CT, patients are stationary during data collection and moved between slices during interscan delays. The study aims to reduce the total acquisition time for contiguous CT images. The authors propose weighting schemes for the convolution/backprojection algorithm that modulate projections from individual and multiple slices to suppress structured artifacts, and compare these methods on artifacts, noise, resolution, and motion. Simulations and volunteer scans show that overlapping patient translation with data acquisition yields acceptable image quality, whereas ignoring it causes significant artifacts, and radiologist review indicates the residual degradation is tolerable for applications requiring more slices within a breathing cycle.
This paper deals with methods of reducing the total time required to acquire the projection data for a set of contiguous computed tomography (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 interscan delay. We 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. We present a number of weighting schemes for use with the conventional convolution/backprojection algorithm to reduce the structured artifacts through the use of projection modulation using the data from individual and multiple slices. We compare the methods with respect to structured artifacts, noise, resolution and to patient motion. Review of preliminary results by a panel of radiologists indicates 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.