论文信息 - Development of a selenium-based flat-panel detector for real-time radiography and fluoroscopy

Development of a selenium-based flat-panel detector for real-time radiography and fluoroscopy

Flat-panel detector (FPD) is the driving force for realizing the next generation of x-ray systems. The purpose of this study was to develop a selenium-based FPD for both radiography and fluoroscopy. The detector uses amorphous selenium (a-Se) and a thin-film transistor (TFT) array. The simple construction of the a-Se layer permits real-time readout. The unique response characteristics of the FPD, which can be saturated over permitted x-ray doses, are provided by the TFT structure. Our prototype FPD was designed to acquire images at 30 frames per second (fps). A high modulation transfer factor was obtained: 0.63 at 2.0 Lp/mm. Sequential fluoroscopic images were acquired at up to 30 fps. The linear characteristics of the detector covered the commonly employed range of clinical exposure dose. Less than 1.5% image lag was measured at 30 fps.

[1] Denny L. Y. Lee,et al. New digital detector for projection radiography , 1995, Medical Imaging.

[2] Youming Li,et al. High-resolution amorphous silicon image sensor , 1996, Medical Imaging.

[3] Larry E. Antonuk,et al. Development of a high-resolution active-matrix flat-panel imager with enhanced fill factor , 1997, Medical Imaging.

[4] I. Blevis,et al. Digital radiology using active matrix readout of amorphous selenium: construction and evaluation of a prototype real-time detector. , 1997, Medical physics.

[5] Thierry Ducourant,et al. Amorphous silicon x-ray image sensor , 1996, Medical Imaging.

[6] Maxwell J. Allen,et al. Characterization of an amorphous-silicon fluoroscopic imager , 1997, Medical Imaging.

[7] Richard L. Weisfield,et al. Improved page-size 127-um-pixel amorphous-silicon image sensor for x-ray diagnostic medical imaging applications , 1997, Medical Imaging.