Nuclear Techniques ›› 2018, Vol. 41 ›› Issue (9): 90401-090401.doi: 10.11889/j.0253-3219.2018.hjs.41.090401


Optimization on calibration of flat panel detector in digital radiography

SUN Chaoming, GE Jiqiang, SUN Kaihua   

  1. Institute of Machinery Manufacturing Technology, China Academy of Engineering Physics, Mianyang 621900, China
  • Received:2018-03-28 Revised:2018-05-08 Online:2018-09-10 Published:2018-09-12
  • Supported by:
    Supported by the Development Fund of Chinese Academy of Engineering Physics (No.2015B0203028)

Abstract: [Background] To a great extent, the acquired image quality in digital radiography depends on the calibration status of digital X-ray detector.[Purpose] In order to avoid fluctuation or deterioration of the image quality, the calibration and performance optimization of digital X-ray detector were studied.[Methods] The detector calibration procedure and signal transformation process inside the detector were analyzed, then a series of calibration tests by changing the X-ray energy and its intensity were carried out.[Results] The tests show that non-uniformity among pixels of the detector is obviously suppressed after effective calibration and gray values of the image are distributed uniformly. If the X-ray intensity is higher in the calibration process, signal noise ratio (SNR) of the calibrated image will be higher accordingly, thus the image quality will be improved. If X-ray energy of the calibration process equals to that of radiographic testing, the output of detector will be calibrated well.[Conclusion] After analysis of the tests, we know that the key to optimize the correction method of the digital detector is to choose an appropriate calibration factor. For the image from a detector of not well calibrated, measures still can be adopted to improve the image quality as follow. The deteriorated image should be restored to a detector response under certain exposure, and then the response can be used to perform a good calibration with another appropriate calibration factor.

Key words: Digital radiography, Flat panel detector, Calibration, Image quality

CLC Number: 

  • TL812+.1