Toward large-area flat-panel sandwich detectors for single-shot dual-energy imaging

The authors have developed a sandwich-like multilayer detector capable of imaging a large field of view. Two detector layers use the same photodiode arrays based on complementary metal-oxide-semiconductor active pixel technology while the scintillators of the front and rear detectors are composed of Gd2O2S : Tb and CsI : Tl, respectively. The front detector is implemented on a flexible printed-circuit board (FPCB) that is electrically connected to a corresponding control/readout PCB located under the rear detector’s control/readout PCB. The energy separation between two detector layers can be improved by using additional interlayer filters. Imaging performance of each detector layer is investigated for various filter designs. The imaging performance is evaluated in terms of large-area signal and noise, modulation-transfer function, noise-power spectrum, and detective quantum efficiency.

[1]  J H Siewerdsen,et al.  Cardiac gating with a pulse oximeter for dual-energy imaging. , 2008, Physics in medicine and biology.

[2]  Ying Chen,et al.  Intercomparison of methods for image quality characterization. I. Modulation transfer function. , 2006, Medical physics.

[3]  Ho Kyung Kim,et al.  Feasibility of active sandwich detectors for single-shot dual-energy imaging , 2014, Medical Imaging.

[4]  Min Kook Cho,et al.  Radiation Effects on the Performance of CMOS Photodiode Array Detectors and the Role of Gain-Offset Corrections , 2009, IEEE Transactions on Nuclear Science.

[5]  John M Boone,et al.  An improved method for flat-field correction of flat panel x-ray detector. , 2006, Medical physics.

[6]  Kevin Barraclough,et al.  I and i , 2001, BMJ : British Medical Journal.

[7]  Hyoung-Koo Lee,et al.  Defective pixel map creation based on wavelet analysis in digital radiography detectors , 2011 .

[8]  Ian A. Cunningham,et al.  Single-shot dual-energy x-ray imaging with a flat-panel sandwich detector for preclinical imaging , 2014 .

[9]  I A Cunningham,et al.  Normalization of the modulation transfer function: the open-field approach. , 2008, Medical physics.

[10]  J Yorkston,et al.  Multiscale deformable registration for dual-energy x-ray imaging. , 2009, Medical physics.

[11]  E. Samei,et al.  A method for measuring the presampled MTF of digital radiographic systems using an edge test device. , 1998, Medical physics.

[12]  E. Park,et al.  Effects of the energy-separation filter on the performance of each detector layer in the sandwich detector for single-shot dual-energy imaging , 2016 .