Scaled radiography reconstruction
AssigneesKoninklijke Philips N.V., Ion Beam Applications S.A.
InventorsDirk SCHÄFER, Peter George VAN DE HAAR, Sebastien BROUSMICHE
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Abstract
The invention relates to off-center detector 3D X-ray or proton radiography reconstruction. Redundancy weighting with a steep weighting function around the iso-axis typically leads to artifacts in the reconstruction, for example, if inconsistencies between two nominal redundant projections occur, e.g. due to slightly incorrect detector calibration or scatter correction, etc. With the present invention, an approach is presented for overcoming or mitigating these problems.
Claims12
An apparatus for off-center detector 3D X-ray reconstruction or for proton radiography reconstruction, comprising a processing unit arranged for
- obtaining acquisition data measured by an off-center X-ray detector or by a proton detector, wherein the acquisition data includes a first portion and a second portion, wherein the first and second portion both cover at least a detector overlap region,
- determining a first reference value indicative of measured line integral values for the first portion in the detector overlap region and determining a second reference value of measured line integral values for the second portion in the detector overlap region,
- scaling at least one of the first portion and the second portion of the acquisition data based on a ratio of the first and second reference values, and
- performing reconstruction using the result of the scaling.
A method for off-center detector 3D X-ray reconstruction or for proton radiography reconstruction, comprising the steps of
- obtaining acquisition data measured by an off-center X-ray detector or by a proton detector, wherein the acquisition data includes a first portion and a second portion, wherein the first and second portion both cover at least a detector overlap region,
- determining a first reference value indicative of measured line integral values for the first portion in the detector overlap region and determining a second reference value of measured line integral values for the second portion in the detector overlap region,
- scaling at least one of the first portion and the second portion of the acquisition data based on the first and second reference values, and
- performing reconstruction using the result of the scaling.
Dependencies are inferred from the claim text.