|
KMID : 1151820090030040035
|
|
Journal of the Korean Society of Radiology
2009 Volume.3 No. 4 p.35 ~ p.38
|
|
|
The signal property and structure design of CsI:Na/a-Se for diagnostic x-ray imaging
|
|
Park Ji-Koon
Heo Ye-Ji
Park Jeong-Eun
Park Sang-Jin
Kim Hyun-Hee
Noh Si-Cheol
Kang Sang-Sik
|
|
|
Abstract
|
|
|
|
Flat-panel x-ray detectors using a phosphor and photoconductor material have been used for application in various medical modalities. In this study, the monte carlo simulation, optical and x-ray response characteristics were investigated in the conversion structure obtained by a columnar CsI:Na scintillation layer with a photosensitive amorphous selenium layer. Firstly, from the measurement of luminescent spectrum of CsI:Na and absorption spectrum of a-Se layer, the signal conversion characteristics are analysed. And also, the x-ray sensitivity is measured and compared with conventional a-Se(500㎛) as a function of electrical field. From the experimental result, the x-ray sensitivities of the CsI:Na(180㎛)/a-Se(30㎛) detector and the a-Se(500㎛) detector were 7.31 nC/mR-㎠ and 3.95nC/mR-㎠at an electric field of 10V/㎛, respectively.
|
|
|
KEYWORD
|
|
|
diagnostic imaging, Amorphous selenium, sensitivity, phosphor, conversion efficiency
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|