Method for imaging with the aid of a multirow computed tomograph
AssigneeSiemens Aktiengesellschaft
InventorsGudrun Russinger, Johann Russinger
Life of this patent
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Abstract
A method is for imaging with the aid of a multirow computed tomograph. A volume scan of an examination area of a patient is carried out, with the injection of a contrast medium, at a scanning speed in a scanning direction in order to reconstruct one or more images of the examination area. In the method, the scanning speed is adapted to the propagation speed of the contrast medium in the scanning direction. The method permits the contrast medium requirement to be reduced in the case of CT examinations with the administration of contrast medium.
Claims16
A method for multidimensional imaging with the aid of a multirow computed tomograph, in the case of which a volume scan of an examination area of a patient is carried out, with an injection of a contrast medium, at a scanning speed in one scanning direction in order to reconstruct one or more images of the examination area, the method comprising:
- matching the scanning speed to a propagation speed of the contrast medium in the scanning direction, by virtue of the fact that repeatedly during the volume scan, the matching including at least one of,
- determining a value referring to the contrast medium content at a respective instantaneous scanning position by reading out and evaluating measured values from the detector elements of the computed tomograph, and in the event of dropping below a threshold value, at least temporarily reducing or increasing the scanning speed is until the value is once again above the threshold value, and
- comparing attenuation values of at least one leading detector row in the scanning direction at an instantaneous position of the detector row with attenuation values that are detected directly thereafter at the same position with the aid of at least one other detector row, and in the event of a difference between the attenuation values that exceeds a threshold value, at least one of reducing and increasing the scanning speed until the difference is below the threshold value.
A method for matching a scanning speed for scanning an examination area injected with a contrast medium via a multirow computed tomograph to a propagation speed of the contrast medium in the scanning direction, by virtue of the fact that repeatedly during the volume scan, the method comprising at least one of:
- determining a value referring to the contrast medium content at a respective instantaneous scanning position by reading out and evaluating measured values from the detector elements of the computed tomograph, and in the event of dropping below a threshold value, at least temporarily reducing or increasing the scanning speed is until the value is once again above the threshold value;
- and
- comparing attenuation values of at least one leading detector row in the scanning direction at an instantaneous position of the detector row with attenuation values that are detected directly thereafter at the same position with the aid of at least one other detector row, and in the event of a difference between the attenuation values that exceeds a threshold value, at least one of reducing and increasing the scanning speed until the difference is below the threshold value.
A method, comprising:
- carrying out a volume scan of an examination area of a patient, with an injection of a contrast medium, at a scanning speed in one scanning direction in order to reconstruct one or more images of the examination area, wherein the scanning speed is matched to a propagation speed of the contrast medium in the scanning direction, the matching including at least one of,
- determining a value referring to the contrast medium content at a respective instantaneous scanning position by reading out and evaluating measured values from the detector elements of the computed tomograph, and in the event of dropping below a threshold value, at least temporarily reducing or increasing the scanning speed is until the value is once again above the threshold value, and
- comparing attenuation values of at least one leading detector row in the scanning direction at an instantaneous position of the detector row with attenuation values that are detected directly thereafter at the same position with the aid of at least one other detector row, and in the event of a difference between the attenuation values that exceeds a threshold value, at least one of reducing and increasing the scanning speed until the difference is below the threshold value.
Dependencies are inferred from the claim text.