A flat-field correction method for photon-counting-detector-based micro-CT

So E. Park; Jae G. Kim; M. A. A. Hegazy; Min H. Cho; Soo Y. Lee

doi:10.1117/12.2043317

19 March 2014 A flat-field correction method for photon-counting-detector-based micro-CT

So E. Park, Jae G. Kim, M. A. A. Hegazy, Min H. Cho, Soo Y. Lee

Proceedings Volume 9033, Medical Imaging 2014: Physics of Medical Imaging; 90335N (2014) https://doi.org/10.1117/12.2043317
Event: SPIE Medical Imaging, 2014, San Diego, California, United States

Abstract

As low-dose computed tomography becomes a hot issue in the field of clinical x-ray imaging, photon counting detectors have drawn great attention as alternative x-ray image sensors. Even though photon-counting image sensors have several advantages over the integration-type sensors, such as low noise and high DQE, they are known to be more sensitive to the various experimental conditions like temperature and electric drift. Particularly, time-varying detector response during the CT scan is troublesome in photon-counting-detector-based CTs. To overcome the time-varying behavior of the image sensor during the CT scan, we developed a flat-field correction method together with an automated scanning mechanism. We acquired the flat-field images and projection data every view alternatively. When we took the flat-field image, we moved down the imaging sample away from the field-of-view with aid of computer controlled linear positioning stage. Then, we corrected the flat-field effects view-by-view with the flat-field image taken at given view. With a CdTe photon-counting image sensor (XRI-UNO, IMATEK), we took CT images of small bugs. The CT images reconstructed with the proposed flat-field correction method were much superior to the ones reconstructed with the conventional flat-field correction method.

Citation Download Citation

So E. Park, Jae G. Kim, M. A. A. Hegazy, Min H. Cho, and Soo Y. Lee "A flat-field correction method for photon-counting-detector-based micro-CT", Proc. SPIE 9033, Medical Imaging 2014: Physics of Medical Imaging, 90335N (19 March 2014); https://doi.org/10.1117/12.2043317

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available