The measurement of the presampled MTF of a high spatial resolution neutron imaging system

被引：23

作者：

Cao, Raymond Lei. ^{[1
]}

Biegalski, Steven R. ^{[1
]}

机构：

[1] Univ Texas Austin, Nucl Engn Teaching Lab, Austin, TX 78712 USA

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2007年 / 582卷 / 02期

关键词：

spatial resolution; presampled MTF; edge method; MCP neutron detector; neutron imaging;

D O I：

10.1016/j.nima.2007.08.213

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

A high spatial resolution neutron imaging device was developed at the Mark II TRIGA reactor at The University of Texas at Austin. As the modulation transfer function (MTF) is recognized as a well-established parameter for evaluation of imaging system resolution, the aliasing associated with digital sampling adds complexity to its measurement. Aliasing is especially problematic when using a high spatial resolution micro-channel plate (MCP) neutron detector that has a pixel grid size similar to that of a CCD array. To compensate for the aliasing an angulated edge method was used to evaluate the neutron imaging facility, overcoming aliasing by obtaining an oversampled edge spread function (ESF). Baseline correction was applied to the ESF to remove the noticeable trends and the LSF was multiplied by Hann window to obtain a smoothed version of presampled MTF. The computing procedure is confirmed by visual inspection of a testing phantom; in addition, it is confirmed by comparison to the MTF measurement of a scintillation screen with a known MTF curve. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：621 / 628

页数：8

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