3D Breast ABUS Ultrasound Explained: How the Scan Works, What to Expect, and Why It Matters for Dense Breasts
If you were told after a recent mammogram that you have dense breast tissue, you may have also heard about 3D automated breast ultrasound, or ABUS. This guide walks through what ABUS is, how it works, what to expect during the exam, how it compares to a mammogram, and why it is often recommended as a supplemental screening for women with dense breasts. If you need 3D breast ultrasound in Glendale, our team at Urgent Diagnostic Imaging Center uses the FDA-approved Invenia ABUS 2.0.
What Is ABUS (Automated Breast Ultrasound)?
So what is ABUS? ABUS stands for Automated Breast Ultrasound. It is a 3D imaging system that uses sound waves to produce three-dimensional breast images of the entire breast. It was designed specifically for whole-breast imaging in women with dense breast tissue, where a standard mammogram can be harder to interpret. Unlike a handheld breast ultrasound, where the sonographer moves a probe manually, ABUS uses a curved transducer that automatically scans the breast in a controlled, repeatable way. It uses no radiation and no compression.
How Does ABUS Work?
How does ABUS work? The system uses automated acquisition to capture a full volumetric dataset of each breast in about a minute of scanning per view. A large curved probe is positioned over the breast, and the machine sweeps the transducer across the tissue automatically. The result is a series of ultrasound image slices that are combined into a 3D ultrasound imaging volume the radiologist can review in three planes (coronal, sagittal, and axial). This volumetric breast imaging approach gives your radiologist a consistent, complete view of the breast tissue, which is difficult to achieve with handheld ultrasound alone. How does automated breast ultrasound work in practice? Every scan follows the same standardized protocol, so images can be compared over time.
What Makes ABUS Different from a Standard Breast Ultrasound?
A handheld breast ultrasound is targeted: the sonographer scans a specific area of concern, such as a palpable lump or a follow-up on a mammogram finding. ABUS is designed for whole-breast coverage in an asymptomatic patient, meaning the entire breast is scanned in a standardized way. Because ABUS produces a volumetric dataset, the radiologist can revisit any slice at any time without having to rescan the patient. This makes ABUS especially useful for supplemental screening in women with dense breast tissue.
Is ABUS the Same as a Mammogram?
Is ABUS the same as a mammogram? No. A mammogram, also called mammography or, in its newer form, 3D mammography, uses low-dose X-rays to image breast tissue. ABUS uses sound waves. Both are important, and they are typically used together rather than in place of one another. A mammogram is the primary screening test for breast cancer, but it can miss tumors in women with dense breast tissue because both dense tissue and cancer appear white on the image. ABUS adds a second look using a different technology, which helps radiologists find cancers that a mammogram alone may not catch. Studies show the Invenia ABUS 2.0 detects 55% more invasive cancers in dense breasts when used together with mammography.
How Is ABUS Performed?
Here is how ABUS is performed, step by step, so you know what happens during an ABUS exam.
Check in and change. You will change into a gown that opens in the front.
Positioning. You lie face-up on the exam table. A trained technologist applies a small amount of lotion to your chest for proper breast positioning and ensures your breast is aligned under the transducer.
Automated scanning. The technologist positions the curved ABUS probe over one breast at a time. The system automatically scans the breast in a series of passes. Each breast is typically imaged in three views (anteroposterior, lateral, and medial) for full whole-breast coverage.
Multiple scans per breast. Multiple views are needed to capture the entire volume of tissue from different angles. Each individual pass takes about 60 seconds of image acquisition.
Wrap-up. The lotion is wiped off, and you can get dressed and go about your day.
The ABUS procedure is painless and completely radiation-free.
What Does ABUS Show?
What does ABUS show? ABUS produces a full volumetric dataset of each breast, giving your radiologist a three-dimensional view of the tissue. On the resulting images, the radiologist can evaluate:
Breast tissue architecture and any distortions
Cysts (fluid-filled sacs, usually benign)
Solid masses that may need further evaluation
Areas of interest identified on a recent mammogram
Because ABUS uses ultrasound rather than X-ray, it sees through dense tissue differently, which is why it is used as a supplement to mammography for dense-breast patients.
How to Prepare for Your ABUS Exam
ABUS preparation is simple. There is no fasting required, and no special dietary restrictions.
Skip deodorant, lotion, and powder on your chest the day of your exam, as residues can interfere with the scan.
Wear a two-piece outfit so you can change easily.
Bring your insurance card, photo ID, any prior breast imaging on CD or in a portal, and a referral if you have one.
If you have breast implants or scarring from prior breast surgery, let the technologist know so the exam can be adjusted accordingly.
How Long Does an ABUS Exam Take?
How long does an ABUS exam take? The scanning portion takes about 15 minutes total, with roughly one minute per pass and three passes per breast. Including check-in, gown change, and post-exam dressing, plan to be at our clinic for about 30 minutes.
Who Should Consider ABUS?
ABUS is designed as a supplemental screening tool for women who:
Have heterogeneously dense or extremely dense breasts on a recent mammogram
Received a BI-RADS Category C or D breast density classification
Have a family or personal history of breast cancer combined with dense tissue
Want additional screening beyond mammography for peace of mind
Prefer a radiation-free option for supplemental screening
Your OB/GYN, primary care doctor, or radiologist may recommend ABUS after your mammogram, or you can ask about it directly if you know you have dense breasts.
Frequently Asked Questions
Does ABUS replace a mammogram?
No. ABUS is a supplement to mammography, not a replacement. The two tests use different technologies (X-ray for mammography, ultrasound for ABUS), and together they give the radiologist a more complete picture, especially in dense breast tissue.
How do I know whether I have dense breasts?
Your mammogram report includes a breast density classification (BI-RADS A, B, C, or D). Categories C (heterogeneously dense) and D (extremely dense) are considered dense breasts. In California, you also receive a notice about dense breast tissue with your mammogram results.
Does ABUS use radiation?
No. ABUS uses only sound waves. There is no radiation, no injectable contrast, and no needles, so it can be safely repeated.
Does ABUS scan the entire breast?
Yes. ABUS is designed for whole-breast coverage. Multiple passes are taken from different angles to ensure the entire volume of tissue is imaged.
Why are multiple scans taken of each breast?
Multiple views are needed to capture the entire breast from different angles (typically anteroposterior, lateral, and medial). This ensures whole-breast imaging with no missed tissue.
Does ABUS compress the breast?
No. Unlike mammography, ABUS uses light contact from a curved transducer instead of compression. Most patients describe the exam as comfortable.
Same-Day 3D Breast ABUS Ultrasound at Urgent Diagnostic Imaging Center in Glendale
If you need 3D breast ultrasound in Glendale, our team at Urgent Diagnostic Imaging Center uses the FDA-approved Invenia ABUS 2.0 system, the same technology many hospital-based breast centers use. Our ARDMS-licensed sonographers and board-certified radiologists deliver preliminary reports at exam completion and same-day finals for your physician. Walk-ins are welcome during business hours (Monday through Friday, 9 AM to 8 PM, and weekends, 9 AM to 5 PM).
To see our full range of diagnostic imaging services, including general ultrasound, vascular studies, echocardiogram, and X-ray, visit our services page. Ready to book 3D Breast Ultrasound? Call (818) 240-7744 or walk into 1030 S. Glendale Ave, #405, Glendale CA 91205.
