A theoretical model evaluating the angular distribution of luminescence emission in X-ray scintillating screens

被引：14

作者：

Kandarakis, I ^{[1
]}

Cavouras, D

Nikolopoulos, D

Episkopakis, A

Kalivas, N

Liaparinos, P

Valais, I

Kagadis, G

Kourkoutas, K

Sianoudis, I

Dimitropoulos, N

Nomicos, C

Panayiotakis, G

机构：

[1] TEI Athens, Dept Med Instruments Technol, Athens 12210, Greece

[2] Greek Atom Energy Commiss, Aghia Paraskevi 15310, Greece

[3] Univ Patras, Sch Med, Dept Med Phys, Patras 26500, Greece

[4] TEI Athens, Dept Phys Chem & Mat Technol, Athens 12210, Greece

[5] Med Ctr Euromed Alexandas, Athens, Greece

[6] TEI Athens, Dept Elect, Athens 12210, Greece

来源：

APPLIED RADIATION AND ISOTOPES | 2006年 / 64卷 / 04期

关键词：

scintillators; X-ray imaging; luminescence; angular distribution;

D O I：

10.1016/j.apradiso.2005.11.016

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The aim of this study was to examine the angular distribution of the light emitted from radiation-excited scintillators in medical imaging detectors. This distribution diverges from Lambert's cosine law and affects the light emission efficiency of scintillators, hence it also affects the dose burden to the patient. In the present study, the angular distribution was theoretically modeled and was used to fit experimental data on various scintillator materials. Results of calculations revealed that the angular distribution is more directional than that predicted by Lambert's law. Divergence from this law is more pronounced for high values of light attenuation coefficient and thick scintillator layers (screens). This type of divergence reduces light emission efficiency and hence it increases the incident X-ray flux required for a given level of image brightness. (c) 2005 Elsevier Ltd. All rights reserved.

引用

页码：508 / 519

页数：12

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