Method for processing measurement data from perfusion computer tomography

摘要

A method is disclosed for processing measurement data from perfusion computed tomography, in which both perfusion parameters, in order to calculate which arterial and venous TACs are generated, and dynamic CTA images are generated from the measurement data. In at least one embodiment of the proposed method, averaging is performed over the dynamic CTA images from a plurality of temporally successive time phases in order to obtain averaged CTA images, wherein the time phases over which averaging is performed are determined from the arterial or venous TAC(s). In some cases, the method can dispense with an additional static CTA and so the amount of the injected contrast agent and the radiation dose can be reduced.

主权项

1. A method for processing measurement data from perfusion computed tomography (CT), comprising:
calculating perfusion parameters and at least one dynamic CT-angiography image from the measurement data, the measurement data being gathered by an Adaptive 4D CT scanner such that a same one of the measurement data gathered at a same time is used to calculate both the perfusion parameters and the dynamic CT-angiography image, the dynamic CT-angiography image associated with a short vessel section and the perfusion parameters used to calculate which arterial and venous time attention curves are generated; for each of the calculating perfusion parameters and the calculating the at least one dynamic CT-angiography image, averaging, in each case over a plurality of dynamic CT-angiography images from temporally successive time phases, to obtain one or more averaged CT-angiography image such that the one or more averaged CT angiography images are associated with a longer vessel section than the dynamic CT-angiography image, the temporally successive time phases for averaging being determined from the at least one time-attenuation curve; and distinguishing between voxels representing bones and voxels representing vessels by:
determining a change in time of a Hounsfield Unit (HU) value of a respective voxel over a number of time phases and at least one of:
assigning voxels of the at least one dynamic or the at least one averaged CT-angiography images without variation in the HU value or voxels with only one variation in the HU value lying within an interval to the bones, andassigning voxels with a variation in the HU value lying above an interval to the vessels.