Tomosynthesis, usually called 3D mammography, is an imaging method in which the X-ray tube moves through an arc over the compressed breast and the system reconstructs thin slices from many low-dose projections. This article explains what tomosynthesis is, how it works and what a radiologist or clinic owner should consider when adding digital mammography with tomosynthesis to a service. It is technical background, not patient advice.
What is tomosynthesis
Conventional 2D mammography projects the whole breast onto a single image, so dense tissue can overlap and hide a lesion or mimic one. Tomosynthesis addresses overlap by acquiring several projections from different angles and reconstructing them into a stack of slices that the radiologist scrolls through.
It is a form of limited-angle tomography, which differs from CT: the sweep covers only a small arc, so slice thickness along the beam is greater than in-plane resolution. Compression is still used, and the breast stays in the same position for the scan.
How does tomosynthesis work
During the scan the tube moves while a series of low-dose exposures is captured by the detector. Reconstruction software then calculates slices parallel to the detector. An anti-scatter grid and the correction of the collimated field help image quality during the sweep.
On the Villa Melody IIID TS the manufacturer lists three selectable scan angles of 15, 24 and 50 degrees, with up to 50 degrees intended to help localise low-contrast lesions, an anti-scatter grid used during the scan and dynamic correction of the collimation field. With the Fast a-Se detector, scan times of 2.5, 4 and 7.7 s are listed. Read about the product on the Melody IIID TS page.
- Tube moves through an arc during the exposure
- Many low-dose projections are acquired
- Reconstruction creates thin slices
- Radiologist reviews the stack on a workstation
Clinical value and limits of tomosynthesis screening
Published studies in screening populations have reported higher cancer detection and, in several settings, lower recall rates with tomosynthesis added to 2D, particularly in dense breasts. Results vary between studies and programmes, so a clinic should consult current guidelines and its own radiologists.
Limits remain: reading time is longer, data volumes are larger, and some findings such as certain calcifications are still assessed on 2D images. For a direct comparison see tomosynthesis versus 2D mammography and, for dose questions, mammography radiation dose.
Tomosynthesis in the clinic: equipment and workflow
Introducing tomosynthesis affects the whole chain: tomosynthesis-capable gantry, detector speed, acquisition station, reporting workstation with slice-viewing tools, PACS storage and radiologist training. Plan the reading workflow before the first patient.
Some units are designed to be upgraded in the field. The Melody IIID can be upgraded to tomosynthesis, tomo-guided biopsy and Dual Energy, which lets a centre phase the investment. Tomosynthesis can also guide biopsy; see tomosynthesis-guided biopsy.
What clinic owners should do next
Define how many examinations you expect, how many radiologists will read them and whether 3D will be the default or an option. Ask suppliers for sample cases, scan-time data and the reporting workstation demonstration, and confirm UAE registration and licensing requirements with the authority.
Beckfinity's specialists can help you specify a tomosynthesis-capable or upgradable system. Request a consultation, and for pricing structure read our article on mammography machine cost.
Frequently asked questions
What is tomosynthesis?
It is 3D mammography: multiple low-dose projections taken as the tube moves through an arc are reconstructed into thin slices of the breast.
How does tomosynthesis work?
The tube sweeps over the compressed breast, the detector records the projections and software reconstructs slices parallel to the detector.
Is tomosynthesis the same as CT?
No. It covers a limited angle, so depth resolution is lower than in CT, while in-plane resolution remains high.
Does tomosynthesis replace 2D mammography?
It depends on the system and protocol. Many centres combine them or use reconstructed 2D images; confirm availability with the supplier.
Can an existing unit be upgraded?
Some models can. The Melody IIID is listed as field-upgradable to tomosynthesis; confirm the scope and timing in writing.
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