Automated ultrasound matches handheld screening for dense breast cancer detection with fewer false alarms

Women with dense breast tissue face a particular problem: on a mammogram, both the healthy tissue and any tumors show up white, making cancers easier to miss. Over the past decade, states and the federal government have begun requiring radiologists to tell women about this limitation, and many have turned to ultrasound as a supplemental screening tool. But ultrasound screening itself comes in two forms—one performed by a technician with a handheld probe, the other by a machine that scans automatically—and until now, no one had directly compared how well they actually work.

A study published in the Journal of the American College of Radiology set out to answer that question. Researchers from the University of Illinois Chicago, the University of Vermont, and the Breast Cancer Surveillance Consortium analyzed data from three separate registries, pulling together results from 25,328 screening ultrasound exams performed on 21,446 women across 27 different facilities. Ninety-eight radiologists interpreted the images. Of those exams, 4,218 used automated breast ultrasound, or ABUS, while 21,110 used the handheld version, known as HHUS.

The findings were clear: both methods found cancer at roughly the same rate. But automated ultrasound had a significant advantage—it produced far fewer false alarms. The automated machines generated fewer abnormal readings overall, and when they did flag something as potentially concerning, it was less likely to turn out to be nothing. This meant fewer women received recommendations for additional imaging or short-interval follow-up scans, reducing unnecessary anxiety and expense without sacrificing the ability to catch actual disease.

Handheld ultrasound has been around for years, but it carries inherent limitations. The quality of the exam depends heavily on the skill and consistency of the person holding the probe. Different technicians may scan differently, and the same woman might get different results on different days. Automated ultrasound, approved by the FDA in 2012 for supplemental screening, sidesteps these problems. A machine performs the scan the same way every time, producing standardized images that radiologists interpret.

The demand for supplemental ultrasound screening has grown sharply since state laws and federal regulations began requiring clinics to inform women with dense breasts about mammography's limitations. Radiology departments have struggled to keep up. Handheld ultrasound is labor-intensive—it requires a trained technician to spend time with each patient. Automated machines can process more patients in the same amount of time, potentially easing the bottleneck.

Lead investigator Garth Rauscher, from the University of Illinois Chicago, noted that automated ultrasound showed lower rates of abnormal interpretations and false-positive initial assessments compared to handheld screening. The two methods did not differ in their ability to recommend biopsies for actual cancers or in their false-positive biopsy rates—meaning when either method flagged something serious enough to warrant a biopsy, it was equally likely to be right.

Senior author Brian Sprague, from the University of Vermont Cancer Center, called the results "the strongest evidence to date" for using automated ultrasound as an alternative to handheld screening in women with dense breasts. The implication is significant: if radiology clinics can adopt automated ultrasound without sacrificing cancer detection, they can screen more women, reduce unnecessary follow-up procedures, and free up technician time for other work. For women, it means potentially faster appointments and fewer callbacks for imaging that turns out to be benign. The study suggests that as demand for supplemental screening continues to climb, automated ultrasound offers a path to meet it without compromising care.