Abbreviated MRI
Abbreviated MRI is a shorter contrast-enhanced breast MRI acquisition protocol designed to reduce cost and improve access, particularly for supplemental screening in high-risk patients.
Protocol Definition
There is no single standard definition, but key features include:
- Scan time typically less than 10 minutes
- Minimum required sequences: T2-weighted localizer + T1-weighted pre-contrast + single early post-contrast series (with or without active fat suppression)
- Some protocols also include a T2-weighted series
Critical Timing Requirement
As with full protocol DCE MRI, the early post-contrast series must be acquired at 60–120 seconds after contrast administration — the window of maximum enhancement for most breast cancers and the largest contrast difference from BPE.
Interpretation Considerations
- Interpretation is similar to full protocol MRI
- If only a single early post-contrast sequence is performed: no delayed-phase kinetics available
- Early post-contrast kinetics can still be assessed
- “Fast” or “ultrafast” protocols allow even earlier kinetic analysis (time-to-enhancement, slope, area under the curve)
Limitations Versus Full Protocol
| Feature | Full Protocol | Abbreviated |
|---|---|---|
| Delayed kinetics | Available | Not available (single post-contrast) |
| Scan time | ~45–60 min | <10 min |
| Clinical indications | All | Primarily screening |
| T2 series | Included | Optional |
Clinical Context
Abbreviated MRI has been investigated and implemented at some sites for supplemental screening in high-risk patients. Ongoing research is evaluating its sufficiency for other clinical indications (e.g., staging, problem-solving).
Board Pearl
Abbreviated MRI uses at minimum: T2 localizer + T1 pre-contrast + T1 single early post-contrast. Timing of the post-contrast series at 60–120 seconds remains essential — same as full protocol.