New technology may help radiologists find more breast cancers

CHICAGO - Digital tomosynthesis shows promise over conventional film mammography as a more specific breast screening technique and a more accurate diagnostic technology, according to a study presented today at the annual meeting of the Radiological Society of North America (RSNA).

"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 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 bre

Contact: Maureen Morley
Radiological Society of North America

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