Stereotactic Breast Biopsy

Image-guided percutaneous biopsy of mammographically-detected microcalcifications or masses not well seen on ultrasound. Performed on a dedicated prone stereotactic table or as an upright add-on to a standard mammography unit. Vacuum-assisted core biopsy device (8–11 gauge typical) samples the lesion after stereotactic triangulation.

Clinical pathway

Positioning — prone on dedicated table with breast through aperture, or upright with compression paddle.
Scout mammogram + stereo pairs — two views at ±15° to triangulate lesion in 3D.
Local anesthesia + skin nick.
Needle placement — vacuum-assisted core biopsy system advanced to target; confirmation stereo pair.
Sampling — 8–12 cores typically; specimen radiograph to confirm calcifications captured.
Clip deployment — marker clip left at biopsy site for future localization.
Post-procedure mammogram in two views.

Typical systems

Hologic Affirm Prone table
Hologic Selenia Dimensions with upright Affirm stereo add-on
Hologic 3Dimensions with Affirm
Siemens MAMMOMAT Revelation with stereo package
Siemens MAMMOMAT Inspiration with stereo

Room + procedure characteristics

Procedure time: 45–60 min.
Team: breast imager + mammographer + biopsy nurse / second tech.
Imaging: 2D mammography; tomosynthesis-guided stereo increasingly the modern standard (reduces table time, improves calcification localization, samples lesions seen only on tomo).

Equipment considerations that bite

Tomo-guided vs 2D-stereo guidance. Tomo-guided biopsy targets lesions visible only on tomosynthesis — that's a meaningful share of modern recall workups. A unit without tomo-bx licensing can't sample tomo-only findings.
Detector age and condition — same selenium-detector aging concerns as diagnostic mammography. A tired detector under stereo geometry produces softer localization.
Compression paddle inventory — biopsy paddles, fenestrated and non-fenestrated, are model-specific. A missing biopsy paddle stops the procedure.
Vacuum-assisted device compatibility — ATEC, Mammotome, EnCor, EnCor Enspire — site-stocked devices must mate with the table's adapter. Check on refurb deals; adapters and arms are often missing.
Specimen radiograph — most modern stereo systems include in-table specimen-imaging; legacy add-on units may require transport to the main mammography unit.
Affirm vs prone-table economics — upright Affirm-on-Dimensions allows the same room to do screening, diagnostic, and biopsy; dedicated prone tables are more comfortable for patients but reduce room utilization.

MQSA + safety reality

MQSA-accredited — every clinical mammography unit, including stereo, requires MQSA certification.
Annual physicist survey for the stereo geometry — accuracy of needle-positioning is a separate test from imaging accuracy.
Vacuum + sterile field protocols — biopsy is a sterile procedure on imaging hardware; cleaning and sterile-drape inventory between cases is its own discipline.

Operational reality

Throughput is operator + nurse-time-limited, not machine. A dedicated biopsy block on the schedule keeps the room moving; mixing biopsies into a screening list breaks both.
Patient experience matters — prone positioning is uncomfortable for some; upright Affirm gives an alternative pathway. Patient-facing reviews shape program reputation more than imaging quality differences do.
Refurb economics — biopsy add-ons are commonly the price-determining variable on Selenia / 3Dimensions deals; the underlying mammography unit + biopsy package + vacuum device is a three-line bundle.