An improved method for flat-field correction of flat panel x-ray detector

In this Technical Note, the effects of different flat-field techniques are examined for a cesium iodide flat panel detector, which exhibited a slightly nonlinear exposure response. The results indicate that the variable flat-field correction method with the appropriate polynomial fit provides excell...

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Bibliographic Details
Published in:Medical physics (Lancaster) 2006-02, Vol.33 (2), p.391-393
Main Authors: Kwan, Alexander L. C., Seibert, J. Anthony, Boone, John M.
Format: Article
Language:English
Subjects:
Algebraic structures and number theory
Cancer
Cesium
CESIUM IODIDES
Computed radiography
Computed tomography
CORRECTIONS
diagnostic radiography
Humans
Image sensors
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
Iodides
Medical image reconstruction
Medical imaging
Medical X‐ray imaging
Phantoms, Imaging
POLYNOMIALS
Quantum noise
RADIATION DETECTORS
Radiation Dosage
RADIATION PROTECTION AND DOSIMETRY
Radiographic Image Enhancement - methods
Radiography - methods
SPECTRA
Technology, Radiologic
X RADIATION
X-RAY DETECTION
X-Ray Intensifying Screens
X‐ and γ‐ray sources, mirrors, gratings, and detectors
X‐ray detectors
X‐ray effects
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Summary:In this Technical Note, the effects of different flat-field techniques are examined for a cesium iodide flat panel detector, which exhibited a slightly nonlinear exposure response. The results indicate that the variable flat-field correction method with the appropriate polynomial fit provides excellent correction throughout the entire exposure range. The averaged normalized variation factor, used to assess the nonuniformity of the flat-field correction, decreased from 30.76 for the fixed correction method to 4.13 for the variable flat-field correction method with a fourth-order polynomial fit for the 60 kVp spectrum, and from 16.42 to 3.97 for the 95 kVp spectrum.
ISSN:0094-2405
2473-4209
DOI:10.1118/1.2163388