Application Of A Reflection Technique For Improved Temporal Resolution With Dynamic And ECG-gated Computed Tomography

M. Nassi; W. R. Brody; P. Cipriano; P. Stonestrom; C. Morehouse; D. Moss; A. Macovski

doi:10.1117/12.958199

26 December 1979 Application Of A Reflection Technique For Improved Temporal Resolution With Dynamic And ECG-gated Computed Tomography

M. Nassi, W. R. Brody, P. Cipriano, P. Stonestrom, C. Morehouse, D. Moss, A. Macovski

Author Affiliations +

Proceedings Volume 0206, Recent and Future Developments in Medical Imaging II; (1979) https://doi.org/10.1117/12.958199
Event: 23rd Annual Technical Symposium, 1979, San Diego, United States

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%.

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M. Nassi, W. R. Brody, P. Cipriano, P. Stonestrom, C. Morehouse, D. Moss, and A. Macovski "Application Of A Reflection Technique For Improved Temporal Resolution With Dynamic And ECG-gated Computed Tomography", Proc. SPIE 0206, Recent and Future Developments in Medical Imaging II, (26 December 1979); https://doi.org/10.1117/12.958199

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