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New patented technology for improving cardiac CTs receives NIH support
Date:4/13/2010

pt was an important basis for the aforementioned NIH grant.

"We have been using different mathematics to reconstruct the images on a region of interest and have compared the results to the conventional CT images reconstructed from a so-called "complete dataset," which was acquired with wide beams of X-rays, and not truncated. It becomes clear that interior tomography has practical implications," said Wang. "We have data that shows its promise. While medical CT can presently only perform global image reconstruction, we look forward to having precise local reconstruction from a highly truncated dataset."

By applying interior tomography to medical CT, radiation exposure can be reduced, and a large patient can be accommodated because the focus will be on the region of interest and not the entire body.

A scheme is also being developed for faster imaging based on interior tomography (Medical Physics, Vol. 36, No. 8, August 2009). "Cardiac motion limits image quality, but of course you want the heart to be beating," said Wang.

Hardware solutions consist of multi-source imaging, examples of which have already been introduced, including a dual-source cone-beam scanner from Siemens just three years ago. "However, the bulkiness of the detectors and limited space inside a CT gantry still make it impossible to collect a large number of projections simultaneously," Wang said. "And it is expensive and cannot accommodate a large patient."

His group proposes a multisource interior tomography concept. For example, the individual is surrounded by a half dozen or more X-ray tubes and detectors. X-rays are focused in narrow beams on the region of interest and the detectors are also small, not requiring much room. More than 10 views per second are possible, and interior tomography software can potentially provide accurate images of the beating heart.

A greater challenge occurs when physicians introduce an unknown agent into th
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Contact: Susan Trulove
strulove@vt.edu
540-231-5646
Virginia Tech
Source:Eurekalert  

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