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Proceedings Paper

Application Of A Reflection Technique For Improved Temporal Resolution With Dynamic And ECG-gated Computed Tomography
Author(s): M. Nassi; W. R. Brody; P. Cipriano; P. Stonestrom; C. Morehouse; D. Moss; A. Macovski
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Paper Abstract

A new approach to the reconstruction of images with limited data from rotary fan-beam computed tomography (CT) scanners is presented. The missing views are estimated by reflecting the data obtained at source positions in the range (l80±fan angle) away from the desired viewing angle. Due to asymmetry of the source/ detector geometry the "reflected" views may be offset from the desired views and additional corrections are required. Measured and "reflected" views are convolved and backprojected using the standard fan-beam geometry reconstruction algorithm. This method is used to reconstruct 1.8 second images from a rotary fan-beam scanner which rotates 360° in 3 seconds, providing improved temporal resolution for dynamic CT studies with no increase in noise at a constant radiation exposure. In addition, the method is applied to ECG-gated cardiac imaging, reducing the scanning interval required for generating systolic and diastolic images by a factor of 40%.

Paper Details

Date Published: 26 December 1979
PDF: 6 pages
Proc. SPIE 0206, Recent and Future Developments in Medical Imaging II, (26 December 1979); doi: 10.1117/12.958199
Show Author Affiliations
M. Nassi, Stanford University (United States)
W. R. Brody, Stanford University (United States)
P. Cipriano, Stanford University (United States)
P. Stonestrom, Stanford University (United States)
C. Morehouse, Stanford University (United States)
D. Moss, Stanford University (United States)
A. Macovski, Stanford University (United States)

Published in SPIE Proceedings Vol. 0206:
Recent and Future Developments in Medical Imaging II
David G. Brown; Stephen W. Smith, Editor(s)

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