Measurement of the noise power spectrum in digital x-ray detectors

被引：23

作者：

Aufrichtig, R ^{[1
]}

Su, Y ^{[1
]}

Cheng, Y ^{[1
]}

Granfors, PR ^{[1
]}

机构：

[1] GE Med Syst, Santa Clara, CA 95054 USA

来源：

MEDICAL IMAGING 2001: PHYSICS OF MEDICAL IMAGING | 2001年 / 4320卷

关键词：

noise power spectrum; amorphous silicon; flat panel detector; digital x-ray radiography;

D O I：

10.1117/12.430934

中图分类号：

R318 [生物医学工程];

学科分类号：

0831 ;

摘要：

The noise power spectrum, NPS, is a key imaging property of a detector and one of the principle quantities needed to compute the detective quantum efficiency. NPS is measured by computing the Fourier transform of flat field images. Different measurement methods are investigated and evaluated with images obtained from an amorphous silicon flat panel xray imaging detector. First, the influence of fixed pattern structures is minimized by appropriate background corrections. For a given data set the effect of using different types of windowing functions is studied. Also different window sizes and amounts of overlap between windows are evaluated and compared to theoretical predictions. Results indicate that measurement error is minimized when applying overlapping Hanning windows on the raw data. Finally it is shown that radial averaging is a useful method of reducing the two-dimensional noise power spectrum to one dimension.

引用

页码：362 / 372

页数：11

共 8 条

[1] DQE(F) OF 4 GENERATIONS OF COMPUTED RADIOGRAPHY ACQUISITION DEVICES [J].