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Digital Tomosynthesis Shows Promise in Breast CA

November 30th, 2005 Medgadget Editors Ob/Gyn, Radiology, Surgery


The Radiological Society of North America (RSNA) is saying, from its meeting in Chicago, that newly digitized and improved 30-year old tomosynthesis technology shows better specificity and sensitivity for the diagnosis of breast CA than conventional film mammography:

“The results of our preliminary trial suggest that tomosynthesis may decrease false-positive screening mammography findings by half, thereby reducing the number of women who are recalled after screening mammography for a second, more thorough exam,” said lead author Steven Poplack, M.D., associate professor of diagnostic radiology and obstetrics and gynecology at the Dartmouth Hitchcock Medical Center/Dartmouth Medical School in Lebanon, N.H.
A patient’s experience is much the same for tomosynthesis as it is for a standard mammography exam. Tomosynthesis obtains digital data that can be manipulated and displayed in a variety of ways, including paging through or cine display of thin (one millimeter) sections or slices of breast tissue, which eliminates the problem of overlying tissue that might be mistaken for lesions or that may hide small cancers.
To evaluate the role of tomosynthesis in breast cancer screening and diagnosis, Dr. Poplack and colleagues studied 98 women who were recalled for diagnostic imaging following abnormal screening mammograms. The initial screening mammography exams showed 112 findings in the women.
When the researchers compared the exams and took into account findings seen with tomosynthesis only, they found that approximately 40 percent of the patients would not have been recalled had they originally been screened using tomosynthesis. As a diagnostic imaging technique for follow-up of a potential abnormality in the breast, tomosynthesis was as good as, if not better than, diagnostic mammography in 88 percent of patients.
Dr. Poplack is optimistic about the ability of tomosynthesis to improve the overall accuracy of diagnosing breast disease. “Tomosynthesis is going to reduce the number of false-positive screening exams and will probably allow us to find more early breast cancers,” he said.
He pointed to a number of reasons this technology is appealing. “The similarity of tomosynthesis to mammography allows us to build on the current foundation of mammography while improving interpretation,” he said. “It is both an evolution of mammography technology and revolutionary new technology.”

The RSNA press release…
Prototype digital breast tomosynthesis system presented… MAMMOMAT® NovationDR product page at Siemens…
Breast tomosynthesis case studies at Hologic, Inc., maker of digital tomosynthesis systems…

Medgadget Editors

Medical technologies transform the world! Join us and see the progress in real time. At Medgadget, we report the latest technology news, interview leaders in the field, and file dispatches from medical events around the world since 2004.

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