Why is the kinetic curve central to breast MRI?

Malignant lesions typically wash contrast in quickly and then wash it out, while benign lesions enhance more slowly and persist. Reading enhancement over time — the kinetic curve — distinguishes them far better than any single post-contrast image.

Why cover the axilla in a breast study?

The axillary lymph nodes are the first site of regional spread. Planning the axial along the nipple line and extending laterally ensures the axillae are imaged, which is essential for staging.

Why avoid compression in breast MRI?

Unlike mammography, breast MRI needs the tissue undistorted. Compression changes both the diffusion signal and the enhancement kinetics that the diagnosis depends on, so the breasts are left to hang freely in the coil.

Resources/Protocols

Breast (DCE cancer staging)

A dynamic functional study. Cancer builds leaky, chaotic vessels, and this protocol catches the contrast leaking out — repeating the same volume over time and subtracting to isolate what enhances. The kinetic curve, not any single image, is the diagnosis.

Protocols/Breast & MRA

When this study is used

Breast cancer staging and extent-of-disease assessment.
High-risk screening (e.g. BRCA carriers).
Problem-solving an equivocal mammogram or ultrasound; implant integrity.

Patient & coil positioning

Prone in a dedicated breast coil, both breasts hanging freely into the apertures.
Do not compress — compression alters diffusion and the enhancement kinetics the diagnosis relies on.
Arms up and comfortable; a still patient across the long dynamic run is essential.

Localizer

Three-plane localizer confirming both breasts and the axillae are within the coil and FOV.

Sequence planning

Each sequence below lists how the slice group is positioned — the reference line it follows, its coverage, and why it earns its place in the protocol. Plan against the localizer, not by eye.

Axial T2 fat-sat

Axial

Planning — Parallel to the line connecting the posterior breast margins (the nipple line). Include both axillae and the internal-mammary chain.

Why — Cysts and fibroadenomas (fluid-bright); baseline morphology.

Axial T1 non-fat-sat

Axial

Planning — Matched coverage.

Why — Baseline for haemorrhage and fatty cysts; the pre-contrast for subtraction.

Dynamic T1 fat-sat (DCE)

Axial

Planning — Same volume repeated every 60–90 s after injection.

Why — Enhancement over time; a suspicious lesion washes in then washes out.

Subtraction + DWI

Axial

Planning — Post minus pre; DWI alongside.

Why — Isolates enhancing tissue; restricted diffusion supports malignancy.

Representative parameters

Ranges, not commandments — field strength, coil and vendor move the numbers. What must not move is understanding why each sits where it does.

Sequence	Timing	Notes
T2 fat-sat	—	Nipple-line plane; axillae included
T1 non-FS	Pre-contrast	Baseline for subtraction
Dynamic T1 FS	Every 60–90 s post-injection	Kinetic curve
Subtraction / DWI	Post-processing	Isolate enhancement; cellularity

Artifacts & how to fix them

Artifact	Typical cause	Mitigation
Failed fat-sat	Air interface, off isocentre	Dixon method over spectral fat-sat
Motion between phases	Patient shift during dynamic run	Comfortable prone setup; motion correction
Background enhancement	Hormonal parenchymal uptake	Subtraction; time the study to the cycle where possible
Compression distortion	Breast pressed in the coil	Let the breasts hang free; never compress

What am I looking at?

You are not reporting the study, but recognising pathology helps you keep it in the field of view and know when to add a sequence or contrast. How the common findings read on the console:

Finding	Sequence to check	How it reads
Malignant lesion	Dynamic + subtraction	Rapid wash-in then wash-out on the kinetic curve
Benign lesion	Dynamic + T2	Persistent, steady enhancement; often bright and well-defined on T2
Implant rupture	Silicone-specific T2	'Linguine sign' of the collapsed shell within the silicone

Review checklist

Breasts uncompressed and symmetric in the coil.
Axillae and internal-mammary chain covered.
Pre- and post-contrast volumes matched for subtraction.
Kinetic curve read on suspicious enhancement.

Mistakes that cost repeats

Compressing the breast and corrupting the kinetics.
Omitting subtraction, so a lesion hides in background enhancement.
Motion between dynamic phases misregistering the subtraction.
Clipping the axilla and missing nodal disease.

Common questions

Why is the kinetic curve central to breast MRI?: Malignant lesions typically wash contrast in quickly and then wash it out, while benign lesions enhance more slowly and persist. Reading enhancement over time — the kinetic curve — distinguishes them far better than any single post-contrast image.
Why cover the axilla in a breast study?: The axillary lymph nodes are the first site of regional spread. Planning the axial along the nipple line and extending laterally ensures the axillae are imaged, which is essential for staging.
Why avoid compression in breast MRI?: Unlike mammography, breast MRI needs the tissue undistorted. Compression changes both the diffusion signal and the enhancement kinetics that the diagnosis depends on, so the breasts are left to hang freely in the coil.

Try it in ScanFlo: Run the dynamic series and generate the subtraction, then place a region of interest on an enhancing focus and read its curve. Wash-in-then-out versus steady persistence is the call — and it lives in the curve, not a single frame.

← All breast & mra studies