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Optimizing photon fluence measurements for the accurate determination of detective quantum efficiency

[+] Author Affiliations
Molly Wong, Da Zhang

University of Oklahoma, Center for Bioengineering and School of Electrical and Computer Engineering, 202 West Boyd Street, Room 219, Norman, Oklahoma 73019

John Rong

UT MD Anderson Cancer Center, Imaging Physics Department, Houston, Texas 77030

Xizeng Wu

University of Alabama at Birmingham, Department of Radiology, Birmingham, Alabama 35233

Hong Liu

University of Oklahoma, Center for Bioengineering and School of Electrical and Computer Engineering, 202 West Boyd Street, Room 219, Norman, Oklahoma 73019

J. Electron. Imaging. 18(4), 043010 (December 04, 2009). doi:10.1117/1.3268363
History: Received July 23, 2009; Revised October 02, 2009; Accepted October 09, 2009; Published December 04, 2009; Online December 04, 2009
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Our goal was to evaluate the error contributed by photon fluence measurements to the detective quantum efficiency (DQE) of an x-ray imaging system. The investigation consisted of separate error analyses for the exposure and spectrum measurements that determine the photon fluence. Methods were developed for each to determine the number of measurements required to achieve an acceptable error. A new method for calculating the magnification factor in the exposure measurements was presented and compared to the existing method. The new method not only produces much lower error at small source-to-image distances (SIDs) such as clinical systems, but is also independent of SID. The exposure and spectra results were combined to determine the photon fluence error contribution to the DQE of 4%. The error in this study is small because the measurements resulted from precisely controlled experimental procedures designed to minimize the error. However, these procedures are difficult to follow in clinical environments, and application of this method on clinical systems could therefore provide important insight into error reduction. This investigation was focused on the error in the photon fluence contribution to the DQE, but the error analysis method can easily be extended to a wide range of applications.

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© 2009 SPIE and IS&T

Citation

Molly Wong ; Da Zhang ; John Rong ; Xizeng Wu and Hong Liu
"Optimizing photon fluence measurements for the accurate determination of detective quantum efficiency", J. Electron. Imaging. 18(4), 043010 (December 04, 2009). ; http://dx.doi.org/10.1117/1.3268363


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