Photon-counting CT algorithm cuts noise in multienergy CT

By Eric Barnes, staff writer

November 3, 2015 --

Monday, November 30 | 3:00 p.m.-3:10 p.m. | SSE22-01 | Room S403B
In this scientific session, researchers from the Mayo Clinic in Rochester, MN, will discuss their use of a new algorithm to reduce noise in multienergy CT scans.

Photon-counting detectors can generate energy-specific images that are assigned to energy bins in relatively small ranges. The trade-off is that because each bin uses only a small portion of the available photons, image noise is greater.

This led Zhicong Yu, PhD, and colleagues to develop an iterative reconstruction algorithm aimed at reducing the noise back to normal levels.

"The purpose of this work was to develop and validate a compressed sensing iterative reconstruction technique that could reduce the noise in the bin images to levels close to that of the composite image (which uses all detected photons)," wrote study co-author Cynthia McCollough, PhD, in an email to

Using their spectral prior image constrained compressed sensing (PICCS) algorithm, the researchers obtained significant noise reduction, averaging 70% in the energy bin images, to the benefit of spectral CT imaging applications.

Check out this Monday afternoon session to get all the details.

Last Updated np 10/29/2015 10:49:02 AM