What is a 3D mammogram? How does it differ from a traditional mammogram?

3D mammograms (Digital Breast Tomosynthesis — DBT) are breast X-ray examinations that capture images from multiple angles and process them into a layered tissue image. This differs from traditional 2D mammograms, which produce a flat, single-plane image. The advantage is that it reduces the problem of breast tissue obscuring other tissues, leading to higher detection of cancer and fewer unnecessary repeat examinations, especially in women with dense breasts. At Numarak Hospital, these examinations are performed by breast surgeons in conjunction with AI technology to assist in interpretation.

What is a 3D mammogram?

A 3D mammogram, officially known as Digital Breast Tomosynthesis (DBT), sometimes shortened to "tomo," takes multiple breast X-ray images from different angles while the breast is compressed. Software then combines these images into a 3D image that appears layered, similar to turning the pages of a book.

The key point is this: In traditional (2D) mammograms, overlapping breast tissue can obscure small lumps, or conversely, overlapping normal tissue may appear as a lump, leading to unnecessary repeat examinations. 3D layered imaging helps reduce both of these problems.

Currently, in most countries, mammograms are performed using 3D technology because it is considered the standard, providing more information in a single examination.

What are the differences between 2D and 3D mammograms?

To illustrate this clearly:

• Image characteristics — 2D images produce a flat image with one plane per corner, while 3D images produce images showing multiple layers of tissue in various planes.

• The problem is overlapping tissue – 2D is high, especially dense breast tissue, while 3D is noticeably lower.

• Cancer detection in 3D is increasing compared to 2D.

• Recall (3D) - Less than 2D

• Suitable for Dense Breast — 3D is a better fit.

• Examiner experience — Similar; both methods require breast compression during imaging.

In summary, the patient's examination experience is almost identical, but the quality of information doctors receive from 3D images is superior.

Is 3D mammogram really better? (Medical evidence)

Several population-based studies confirm the benefits of 3D mammograms:

• A study by STORM (Italy) found that 2D combined with 3D imaging detected 8.1 cancers per 1,000 examinations, compared to 5.3 cases when using 2D imaging alone. Additionally, 20 more cancers were detected that were not detected by 2D imaging.

• Studies in community practice report that 3D imaging reduces repeat examinations by approximately 16% and increases cancer detection rates by about 29% compared to 2D imaging.

• Typical mammograms (including 2D) have a false-negative chance of about 10–20%, depending on age and breast tissue density, which is why 3D mammograms and other supplementary examinations are helpful.

3D imaging increases the chances of detection, but no test is 100% accurate. The best approach is to choose the method best suited to each individual, under the evaluation of a physician.

How does AI help read mammograms?

Artificial intelligence (AI) that assists in reading mammograms acts as a second eye for radiologists. The system analyzes images and helps point out suspicious areas that might be overlooked, especially small calcifications or hidden abnormalities, thus increasing overall accuracy.

Key point to understand: AI is not replacing radiologists. The final diagnosis still rests with the expert radiologist. AI is simply a tool to assist doctors in making more accurate decisions, like having a tireless assistant reviewing every image.

ABUS 3D automated ultrasound: A helpful tool for detecting dense breasts.

ABUS (Automated Breast Ultrasound System) is an ultrasound system that automatically scans the entire breast and creates 3D images. Unlike hand-held ultrasound, ABUS scans systematically and consistently, reducing reliance on manual skills from the examiner, and records all images for later review and comparison with previous examinations.

ABUS is very useful in women with dense breast tissue because it helps detect lesions that may not be visible on mammograms. However, ABUS does not replace regular ultrasound, but the two work together, with the handheld ultrasound being used to specifically examine suspicious areas in detail.

Differences in the examination process at Namarak Hospital.

Effective breast cancer screening doesn't depend solely on the equipment, but also on who interprets the results. At Numarak Hospital, our screening process has three points designed for maximum accuracy:

• Every result is read by a breast radiologist — every mammogram and ultrasound image is interpreted by a breast radiologist, not a general radiologist, which is a key factor in the accuracy of the interpretation.

• AI acts as a second eye — every mammogram and ultrasound examination includes AI-assisted analysis, increasing the chances of detecting abnormalities.

• Includes 3D mammogram + ABUS + localized ultrasound — choose the examination package best suited to your breast tissue, especially for those with dense breasts.

Furthermore, breast surgeons provide comprehensive care, from taking a medical history and performing a physical examination to offering consultations, all within a single day. This ensures both the accuracy of the equipment and close monitoring of the patient.

Limitations and supplementary tests.

While 3D mammograms provide more information than traditional methods, they do have limitations that should be understood:

• Not all lesions can be detected, especially those hidden in very dense tissue.

• In some cases, your doctor may recommend additional tests, such as ultrasound, 3D automated ultrasound (ABUS), or MRI, depending on your individual risk factors.

• The test results should be interpreted by a specialist physician and considered in conjunction with the patient's history and physical examination findings.

Therefore, effective screening does not rely solely on tools, but also on a holistic assessment by a physician.

Who should have a 3D mammogram?

3D mammograms are suitable for:

• Women aged 40 and above who wish to have annual screening.

• Individuals with dense breast tissue, which is difficult to interpret in 2D imaging.

• Individuals with a family history of breast cancer or those at high risk.

• Those who have been frequently asked to repeat checks after 2D scanning.

For women under 40, pregnant women, or breastfeeding women, doctors may recommend ultrasound as the primary examination because breast tissue at this age is often denser and more responsive to ultrasound. Therefore, the choice of examination method should be discussed with a specialist.

Is a 3D mammogram painful? What is the procedure like?

The procedure is similar to a regular mammogram. The breast is gently compressed between compression plates to create a clear image. You may feel a slight tightness or discomfort for a short time, but newer models are designed to reduce pressure, making them more comfortable.

Preparation:

• Take the test 7–14 days after your menstrual period for less pain and more accurate images.

• Avoid applying lotion, powder, or spray to the chest and armpits on the day of the examination.

• Wear clothes that are easy to change into.

• Inform the staff if you have ever had silicone implants or have old test results.

At Namarak Hospital, the entire process, from registration, examination, interpretation of results, to consultation with a doctor, takes approximately 2-3 hours, with specialist surgeons overseeing every step.

How often should I get tested?

For women with general risk factors, annual mammogram screening is recommended starting at age 40, along with monthly breast self-examinations (3-10 days after the first day of menstruation). For those with high risk or a family history of breast cancer, a doctor may recommend starting earlier or having more frequent screenings.

For details on screening packages and costs, please visit the Breast Cancer Screening Services page, where your doctor will recommend the screening package that is right for you.

Frequently Asked Questions (FAQ)

How does a 3D mammogram differ from a 2D one?

3D imaging captures images from multiple angles and combines them into layered tissue images, whereas 2D imaging produces a flat, single-plane image. 3D reduces tissue obscuration, leading to more cancer detection and fewer repeat examinations, especially in dense breast tissue.

Is 3D mammography really better at detecting cancer?

Indeed, population-based research has found that adding 3D imaging helps detect more cancers and reduces the need for repeat tests. However, no test is 100% accurate, so regular checkups as recommended by your doctor are still important.

Is a 3D mammogram painful?

There may be a slight feeling of tightness or discomfort when the breast is compressed, but this is only momentary. Newer models reduce the pressure for greater comfort. Checking 7–14 days after menstruation can help reduce pain.

At what age should one begin having 3D mammograms?

Generally, it is recommended to start annual screening at age 40. Those at high risk or with a family history may start earlier. Consult your doctor to develop an individualized screening plan.

If I have dense breasts, what type of examination should I have?

Women with dense breasts benefit from 3D mammograms and are often supplemented with ultrasound because the dense tissue makes 2D images difficult to interpret. The doctor will choose the most suitable diagnostic package for each individual.

Will AI that helps interpret mammograms replace radiologists?

No, AI doesn't act as a second eye, helping to analyze images and detect abnormalities that might be overlooked. The final diagnosis still rests with the specialist radiologist. At Namarak Hospital, every image is read by a breast radiologist in conjunction with AI.

How does ABUS differ from a regular ultrasound?

ABUS, or automated 3D ultrasound, systematically scans the entire breast and records 3D images for later review. Handheld ultrasound, on the other hand, is used for targeted examination. Both systems work together, with ABUS being particularly beneficial in women with dense breast tissue.

Does a 3D mammogram use a lot of radiation? Is it safe?

The radiation dose from 3D mammograms is low and within safe limits. The benefits of early cancer detection outweigh the risks from this level of radiation. Those who are concerned should consult a doctor.

About Numarak Hospital

Numarak Hospital is a specialized breast hospital in Bangkok, providing comprehensive care from start to finish by a team of breast surgeons, under the concept of High Tech, High Touch. For breast cancer screening or diagnostic consultations, please schedule an appointment through the hospital's channels.

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Content reviewed by: The medical team at Namarak Hospital.

Note: This information is for general knowledge purposes only and is not personalized medical advice. Please consult a healthcare professional for appropriate diagnosis and treatment.