A comparison of methods for estimating the line spread function of a CT imaging system

被引：1

作者：

Abboud, Samir ^{[1
,3
,4
]}

Lee, Kristina ^{[2
]}

Vinehout, Kaleb ^{[2
]}

Paquerault, Sophie ^{[1
]}

Kyprianou, Iacovos S. ^{[1
,4
]}

机构：

[1] US FDA, Ctr Devices & Radiol Hlth, Div Imaging & Appl Math, 10903 New Hampshire Ave,W062-3109, Silver Spring, MD 20993 USA

[2] Marquette Univ, Dept Biomed Engn, Milwaukee, WI 53233 USA

[3] Univ Maryland, Sch Med, Baltimore, MD 21201 USA

[4] Univ Maryland, Dept Bioengn, College Pk, MD 20742 USA

来源：

MEDICAL IMAGING 2011: PHYSICS OF MEDICAL IMAGING | 2011年 / 7961卷

关键词：

MODULATION TRANSFER-FUNCTION; WIRE;

D O I：

10.1117/12.877665

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A quantitative description of the deterministic properties of a CT system is necessary when evaluating image quality. The most common such metric is the modulation transfer function (MTF), usually calculated from a line spread function (LSF) or point spread function (PSF). Currently, there exist many test objects used to measure the LSF or PSF. In this paper we report on a comparison of these measures using: a thin foil slit test object, a teflon cube edge test object and a novel "negative" cube test object. Images were acquired using a custom-built bench-top flat-panel-based cone-beam CT scanner and a cylindrical water-filled PMMA phantom with the test objects embedded in the middle. From the 3-dimensional reconstructed volumes, we estimated the LSF either directly or as estimated from the edge spread function. From these, a modulation transfer function can be estimated, and the frequency dependent image transfer of each object can be reported.

引用

页数：10

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