Jun 25 – 29, 2023
Ole-Johan Dahls Hus
Europe/Oslo timezone

P2.53: Scintillators and image characterization of a flat-panel X-ray detector for single-exposure dual energy imaging

Jun 28, 2023, 5:34 PM
Ole-Johan Spiseri (Ole-Johan Dahls Hus)

Ole-Johan Spiseri

Ole-Johan Dahls Hus

Ole Johan Dahls Hus - Oslo Science Park Gaustadalléen 23B, 0373 Oslo


Dr Bo Kyung Cha (KERI)Prof. Chang-Woo Seo (Yonsei University)Mr Minjae Lee (Yonsei University)


In recent years, digital X-ray imaging detectors with indirect detection technology have been widely used in many medical imaging applications such as radiography, fluoroscopy and cone-beam CT. These indirect X-ray imaging detectors are based on the combination of a thin film transistor (TFT) array with several scintillating screens such as typical CsI, GOS materials. Currently, dual-energy (DE) imaging task using a dual-layer X-ray detection type allows the soft and hard structures (e.g. soft and bone tissues) in the object to be selectively visualized,
In this work, we have designed and employed dual-layer based a-Si array backplanes with top layer and bottom layer for X-ray imaging tasks. A prototype large area image detector consists of TFT array with a 43cm x 43cm active area with 3072x3072 pixel array and 140um pixel pitch. Different scintillation combination such as columnar CsI:Tl and Gd2O2S:Tb(GOS) with various thickness and spectral middle filters were used to investigate the imaging characterization. The specific scintillators in dual-layer configuration were selected and implemented for good image quality at low X-ray dose condition.
For imaging characterization of the dual-layer X-ray imaging detector, different scintillating screens were directly coupled on the prototype photodiode array panel. The preliminary important X-ray characterization such as the detector sensitivity to X-ray exposure dose, signal-to-noise-ratio (SNR) and modulation transfer function (MTF) and phantom imaging were measured under practical imaging systems with 60-120kVp tube voltage and adjustable tube current. The experimental results with a dual-layer based flat panel detector using combination of different scintillators and intermediate filter demonstrated its ability to perform accurate dual-energy imaging with single –exposure.

Primary author

Dr Bo Kyung Cha (KERI)


Prof. Chang-Woo Seo (Yonsei University) Dr Guna Kim (KAERI) Mr Hynwoo Lee (Yonsei University) Prof. Hyosung Cho (Yonsei University) Dr Jeongwon Yang (KERI) Dr Kyeong-Hee Lee (KERI) Mr Minjae Lee (Yonsei University) Dr Sungchae Jeon (KERI)

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