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 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.
Department of Radiology, U. C. Davis Medical Center, X-ray Imaging Laboratory, 4701 X Street, Sacramento, California 95817, USA.
Alexander L C
AL
Kwan
J Anthony
JA
Seibert
John M
JM
Boone
D002586:Cesium; D006801:Humans; D007454:Iodides; D019047:Phantoms, Imaging; D011829:Radiation Dosage; D011856:Radiographic Image Enhancement / Q000379:methods*; D011859:Radiography / Q000379:methods*; D013679:Technology, Radiologic; D014963:X-Ray Intensifying Screens
D007454:Iodides; D002586:Cesium; C040050:cesium iodide