New cesium iodide-selenium x-ray detector structure for digital radiography and fluoroscopy

Alain Jean; Luc Laperriere; Anne Legros; Habib Mani; Ziad Shukri; Henri Rougeot

doi:10.1117/12.349568

28 May 1999 New cesium iodide-selenium x-ray detector structure for digital radiography and fluoroscopy

Alain Jean, Luc Laperriere, Anne Legros, Habib Mani, Ziad Shukri, Henri Rougeot

Proceedings Volume 3659, Medical Imaging 1999: Physics of Medical Imaging; (1999) https://doi.org/10.1117/12.349568
Event: Medical Imaging '99, 1999, San Diego, CA, United States

Abstract

Though most objections to the use of selenium are largely unfounded (lag and ghosting effects, low DQE), the high bias voltage associated with the thick layer of selenium required to have an acceptable x-ray absorption in radiography and fluoroscopy applications, may have some practical inconvenience. The purpose of this study was to evaluate the pertinence of a solution using a thin coplanar selenium layer, as a photosensitive converter requiring only a few tens of volts of bias, associated with a thick columnar coating of sodium doped cesium iodide scintillator. It will be shown that CsI(Na) can be evaporated with a very uniform needle-like morphology on amorphous selenium structures, the later showing no evidence of thermal recrystallization. Photoluminescence characterization of this scintillator material shows a light emission peak centered at 420 nm as expected, which matches the sensitivity spectrum of selenium. Preliminary sensitivity measurements give a signal in the range of 2000 pC/cm²/mR for 400 (mu) -CsI, with no reflector present. The thin selenium layers deposited display low dark currents of less than 130 pA/cm² at an electric field of 10 volts per micron. Work in progress will be presented including the scintillator (x- ray absorption, sensitivity and emission), the thin selenium photosensor as well as the coupled structure characteristics.

Citation Download Citation

Alain Jean, Luc Laperriere, Anne Legros, Habib Mani, Ziad Shukri, and Henri Rougeot "New cesium iodide-selenium x-ray detector structure for digital radiography and fluoroscopy", Proc. SPIE 3659, Medical Imaging 1999: Physics of Medical Imaging, (28 May 1999); https://doi.org/10.1117/12.349568

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available