Effect of the frequency content and spatial location of raw data errors on CT images

Adam S. Wang; Yao Xie; Norbert J. Pelc

doi:10.1117/12.770552

18 March 2008 Effect of the frequency content and spatial location of raw data errors on CT images

Adam S. Wang, Yao Xie, Norbert J. Pelc

Proceedings Volume 6913, Medical Imaging 2008: Physics of Medical Imaging; 691334 (2008) https://doi.org/10.1117/12.770552
Event: Medical Imaging, 2008, San Diego, California, United States

Abstract

As CT scanners continue to increase in speed and to collect more data per rotation, transmitting raw data across the slip ring and storing raw data can be very challenging. While lossy compression can offer a significant reduction in data set size, it introduces errors to the measurements. We examined the effect of noise of different frequencies in the view (temporal) direction as well as at different locations in the detector arc. Our results showed that only low temporal frequency errors in the center detectors can contribute to errors in the center of the reconstructed field-of-view (FOV). On the other hand, high temporal frequency errors only contribute to errors in the periphery of the reconstructed FOV. Whether image errors arise from compression or electronic noise, their relative sensitivity to different frequencies and detectors is an important consideration for applications such as cardiac CT, where the center of the FOV may be considered the most critical region. Therefore, when limiting data rate is essential, detectors could be allocated different bit-rates for compression based on the tolerable frequency content of their errors and their spatial location.

Citation Download Citation

Adam S. Wang, Yao Xie, and Norbert J. Pelc "Effect of the frequency content and spatial location of raw data errors on CT images", Proc. SPIE 6913, Medical Imaging 2008: Physics of Medical Imaging, 691334 (18 March 2008); https://doi.org/10.1117/12.770552

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