Image-domain sampling properties of the Hotelling Observer in CT using filtered back-projection

Adrian A. Sanchez; Emil Y. Sidky; Xiaochuan Pan

doi:10.1117/12.2081984

17 March 2015 Image-domain sampling properties of the Hotelling Observer in CT using filtered back-projection

Adrian A. Sanchez, Emil Y. Sidky, Xiaochuan Pan

Proceedings Volume 9416, Medical Imaging 2015: Image Perception, Observer Performance, and Technology Assessment; 94161F (2015) https://doi.org/10.1117/12.2081984
Event: SPIE Medical Imaging, 2015, Orlando, Florida, United States

Abstract

The Hotelling Observer (HO),¹ along with its channelized variants,² has been proposed for image quality evaluation in x-ray CT.^3,4 In this work, we investigate HO performance for a detection task in parallel-beam FBP as a function of two image-domain sampling parameters, namely pixel size and field-of-view. These two parameters are of central importance in adapting HO methods to use in CT, since the large number of pixels in a single image makes direct computation of HO performance for a full image infeasible in most cases. Reduction of the number of image pixels and/or restriction of the image to a region-of-interest (ROI) has the potential to make direct computation of HO statistics feasible in CT, provided that the signal and noise properties lead to redundant information in some regions of the image. For small signals, we hypothesize that reduction of image pixel size and enlargement of the image field-of-view are approximately equivalent means of gaining additional information relevant to a detection task. The rationale for this hypothesis is that the backprojection operation in FBP introduces long range correlations so that, for small signals, the reconstructed signal outside of a small ROI is not linearly independent of the signal within the ROI. In this work, we perform a preliminary investigation of this hypothesis by sweeping these two sampling parameters and computing HO performance for a signal detection task.

Citation Download Citation

Adrian A. Sanchez, Emil Y. Sidky, and Xiaochuan Pan "Image-domain sampling properties of the Hotelling Observer in CT using filtered back-projection", Proc. SPIE 9416, Medical Imaging 2015: Image Perception, Observer Performance, and Technology Assessment, 94161F (17 March 2015); https://doi.org/10.1117/12.2081984

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

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
6 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

X-ray computed tomography

Signal detection

Image filtering

Image quality

Interference (communication)

Signal to noise ratio

Medical imaging

Show All Keywords

Keywords/Phrases

Search In:

Publication Years