Quantitative analysis of contrast to noise ratio using a phase contrast x-ray imaging prototype

Muhammad U. Ghani; Di Wu; Yuhua Li; Minhua Kang; Wei R. Chen; Xizeng Wu; Hong Liu

doi:10.1117/12.2001525

22 February 2013 Quantitative analysis of contrast to noise ratio using a phase contrast x-ray imaging prototype

Muhammad U. Ghani, Di Wu, Yuhua Li, Minhua Kang, Wei R. Chen, Xizeng Wu, Hong Liu

Proceedings Volume 8582, Biophotonics and Immune Responses VIII; 85820H (2013) https://doi.org/10.1117/12.2001525
Event: SPIE BiOS, 2013, San Francisco, California, United States

Abstract

The purpose of this study was to determine the Contrast to Noise Ratio (CNR) of the x-ray images taken with the phase contrast imaging mode and compare them with the CNR of the images taken under the conventional mode. For each mode, three images were taken under three exposure conditions of 100 kVp (2.8mAs), 120 kVp (1.9mAs) and 140kVp (1.42mAs). A 1.61cm thick contrast detail phantom was used as an imaging object. For phase contrast, the source to image detector distance (SID) was 182.88 cm and the source to object (SOD) distance was 73.15 cm. The SOD was the same as SID in the conventional imaging mode. A computed radiography (CR) plate was used as a detector and the output CR images were converted to linear form in relation with the incident x-ray exposure. To calculate CNR, an image processing software was used to determine the mean pixel value and the standard deviation of the pixels in the region of interest (ROI) and in the nearby background around ROI. At any given exposure condition investigated in this study, the CNR values for the phase contrast images were better as compared to the corresponding conventional mode images. The superior image quality in terms of CNR is contributed by the phase-shifts resulted contrast, as well as the reduced scatters due to the air gap between the object and the detector.

Citation Download Citation

Muhammad U. Ghani, Di Wu, Yuhua Li, Minhua Kang, Wei R. Chen, Xizeng Wu, and Hong Liu "Quantitative analysis of contrast to noise ratio using a phase contrast x-ray imaging prototype", Proc. SPIE 8582, Biophotonics and Immune Responses VIII, 85820H (22 February 2013); https://doi.org/10.1117/12.2001525

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