“Conventional” CT images from spectral measurements

Paurakh L. Rajbhandary; Norbert J. Pelc

doi:10.1117/12.2216988

29 March 2016 “Conventional” CT images from spectral measurements

Proceedings Volume 9783, Medical Imaging 2016: Physics of Medical Imaging; 97831Q (2016) https://doi.org/10.1117/12.2216988
Event: SPIE Medical Imaging, 2016, San Diego, California, United States

Abstract

Spectral imaging systems need to be able to produce "conventional" images, and it's been shown that systems with energy discriminating detectors can achieve higher CNR than conventional systems by optimal weighting. Combining measured data in energy bins (EBs) and also combining basis material images have previously been proposed, but there are no studies systematically comparing the two methods. In this paper, we analytically evaluate the two methods for systems with ideal photon counting detectors using CNR and beam hardening (BH) artifact as metrics. For a 120-kVp polychromatic simulations of a water phantom with low contrast inserts, the difference of the optimal CNR between the two methods for the studied phantom is within 2%. For a polychromatic spectrum, beam-hardening artifacts are noticeable in EB weighted images (BH artifact of 3.8% for 8 EB and 6.9% for 2 EB), while weighted basis material images are free of such artifacts.

Citation Download Citation

Paurakh L. Rajbhandary and Norbert J. Pelc "“Conventional” CT images from spectral measurements", Proc. SPIE 9783, Medical Imaging 2016: Physics of Medical Imaging, 97831Q (29 March 2016); https://doi.org/10.1117/12.2216988

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