Imaging method for a multi-slice spiral CT scan, and a computer tomography unit for carrying out this method
AssigneeSiemens Aktiengesellschaft
InventorsHerbert Bruder, Guenter Lauritsch, Karl Stierstorfer, Kwok Tam
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Abstract
An imaging method is disclosed for a multi-slice spiral CT scan. A CT unit is disclosed for carrying out this method. In the method, the filtering may be formed by use of multiple applications of a ramp filter and a masking operation to a projection image in a different sequence. The CT unit may include, for filtering purposes, multiple applications of a ramp filter and a masking operation to a projection image in a different sequence.
Claims16
An imaging method for a multi-slice spiral CT scan, comprising:
- scanning an object to be examined with reference to the object's absorption behavior by a rotating ray bundle moving in a direction of an axis of rotation;
- collecting the measured absorption data;
- filtering the measured data to reconstruct a volumetric image from the measured data;
- back-projecting the filtered data in three dimensions;
- and generating a volumetric image of the object to be examined, the volumetric image representing absorption values obtained from data of voxels, belonging to a volume of the object to be examined, for radiation of the ray bundle, wherein
- the filtering is performed by multiple applications of a ramp filter R{right arrow over (t)} and a masking operation M to a projection image in different sequences.
A CT unit for scanning an object to be examined, comprising:
- a source emanating a ray bundle from at least one focus;
- a detector array of planar design with a multiplicity of distributed detector elements for detecting rays of the ray bundle, the at least one focus being adapted to move relative to the object to be examined on at least one focal track running around the object to be examined and with the detector array situated opposite thereto;
- and
- means for collecting detector data, filtering and 3D back-projecting the data, wherein the filtering is performed by multiple applications of a ramp filter R{right arrow over (t)} and a masking operation M to a projection image in a different sequences.
An imaging device for a multi-slice spiral CT scan, comprising:
- means for scanning an object to be examined with reference to the object's absorption behavior by a rotating ray bundle moving in a direction of an axis of rotation;
- means for collecting measured absorption data;
- means for filtering the measured data to reconstruct a volumetric image from the measured data;
- means for back-projecting the filtered data in three dimensions;
- and means for generating a volumetric image of the object to be examined, the volumetric image representing absorption values obtained from data of voxels, belonging to a volume of the object to be examined, for radiation of the ray bundle, wherein
- the filtering is performed by multiple applications of a ramp filter R{right arrow over (t)} and a masking operation M to a projection image in different sequences.
Dependencies are inferred from the claim text.