NDLI: Characteristic study of multi-layer using Hybrid method for digital X-ray detector

Content Provider	IEEE Xplore Digital Library
Author	Yoon-suk Kim Min-seok Yun Suk-hee Jung Kyung-min Oh Jung-wook Shin Sang-hee Nam
Copyright Year	2009
Description	Author affiliation: Bio-Medical Engineering Department, Inje University, Gimhae 621-749, Korea (Yoon-suk Kim; Min-seok Yun; Kyung-min Oh; Sang-hee Nam) \|\| R&D Center of LISTEM, Seoul, Korea (Jung-wook Shin) \|\| Medical Imaging&Science Department, Inje University, Gimhae 621-749, Korea (Suk-hee Jung)
Abstract	Recently digital X-ray detector, often called Active-Matrix Flat Panel Detector (AMFPD), have been researched by using either the direct or the indirect conversion method in order to form the digital image. In this paper, we introduced the concept of Hybrid method using phosphor layer to complement a weak point of direct conversion method having low conversion efficiency about X-ray. The Hybrid receptor scheme consists of a photoconductor layer, phosphor layer and top/bottom electrodes to collect charges produced in the photoconductor layer. A light reflective layer was deposited under the phosphor as lower layer. Mercury Iodide (HgI) is used as photoconductor layer to detect X-ray and light from the phosphor, and Cesium Iodide (CsI) is used as phosphor layer to convert X-ray to light. We fabricated a photoconductor (HgI 200um) and a phosphor (CsI 50um) using PIB(Particle In Binder) method. As top and bottom electrodes, ITO (Indium Tin Oxide) layers were deposited to photoconductor layer and light reflective layer(Al 15 to 25um) in order to improve photon conversion efficiency. As results, higher X-ray sensitivity of Hybrid method exhibited comparing with that of direct conventional digital X-ray detector. The Hybrid method shows about 1.5 times higher sensitivity than the direct conversion method. This effect is caused by simultaneous detection of electric signal induced by the direct X-ray absorption in photoconductor layer and by the light absorption produced in phosphor layer. The Hybrid method can solve problems such as lower conversion efficiency of photoconductor, breakdown because of high voltage application in the direct conversion method as well as low fill fator of TFT, low electric image signals and low SNR in indirect conversion method.
Starting Page	3327
Ending Page	3329
File Size	203684
Page Count	3
File Format	PDF
ISBN	9781424439614
ISSN	10957863
DOI	10.1109/NSSMIC.2009.5401746
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-10-24
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	X-ray detectors Phosphors Photoconductivity Image converters X-ray detection X-ray imaging Electrodes Indium tin oxide Electromagnetic wave absorption Breakdown voltage
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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