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Computer-aided detection improves early breast cancer identification

Computer-aided detection improves breast cancers in both screening and diagnostic patients according to a recent study done by a private practice radiologist in Santa Barbara, CA.

The study was conducted to evaluate the impact of CAD in a non-academic setting, most notably its effect on cancer detection in both screening and diagnostic patients. The positive predictive value (PPV) of biopsy recommendations, biopsy rate, and recall rate before and after the introduction of CAD were compared. Then, size, stage, and histology of cancers detected with and without CAD findings were evaluated.

"Early detection is essential in preventing breast cancer deaths, so as a mammography specialist, I'm always looking for tools to improve cancer detection," said Judy Dean, MD, and lead author of the study. "This study began as acceptance testing for the CAD system I purchased for my mammography practice in 2002. I scanned 50 known cancer cases and 50 normal mammograms to see how the software would perform on films from my own practice and was astounded to find that it marked 90% of the cancers. I was really surprised that a computer program could achieve that level of sensitivity, so I decided to see what effect it would have when put into day-to-day use in my practice," said Dr. Dean.

"We collected data until more than a hundred cancers had been found, and then analyzed the results to compare what types of cancers were found with and without CAD assistance," said Dr. Dean. "We used the CAD system for every mammogram performed during the study, not just screening patients, and even in patients with prior surgery, breast implants, or other findings, CAD was helpful in finding more cancers."

During a 28 month period, 9,520 film-screen mammograms were interpreted. According to the study screening-detected cancers increased 13.3% with CAD assistance and 9.5% in diagnostic exams. The greatest impact was on ductal carcinoma in situ (DCIS), t
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Contact: Necoya Lightsey
necoya@arrs.org
703-858-4304
American Roentgen Ray Society
2-Aug-2006


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