Confidence in geometry, from centre to edge of field‑of‑view.
GeoMatrix Large is a large‑field MRI phantom for geometric accuracy assessment, acceptance testing, commissioning, and routine quality assurance. Built for physically traceable measurement it helps teams verify dimensional performance with defensible metrology and clear uncertainty reporting.
NIST-traceable
Metrology-led reference measurements.
Large FOV
Designed for whole‑field geometric checks
AAPM TG-284 compliant
Suitable for QA of radiotherapy and SRS/SRBT systems
A metrology-first large phantom for MRI geometry.
GeoMatrix Large is backed by a dimensional metrology approach intended to give users confidence in the physical reference they are scanning.
01
built around physical truth
GeoMatrix Large is positioned as a dimensional reference object for MRI distortion assessment, where measured physical distances matter.
02
Large-format coverage
Suitable for verifying geometric performance across extended fields-of-view where peripheral distortion can become clinically significant.
03
NIST-traceable confidence
Each GeoMatrix Large phantom is supported by a traceable dimensional metrology approach, with measured values, thermal correction, and stated uncertainty.
Where GeoMatrix Large fits
✔
✔
✔
✔
Acceptance testing
Establish baseline geometric performance when a scanner, gradient set, software version, or table configuration is introduced.
Radiotherapy QA
suitable geometric distortion QA for radiotherapy planning and stereotactic treatments.
Routine QA
Track long-term dimensional stability and scanner geometric performance over time.
Multi-site comparison
Use the same physical reference object to improve comparability across systems and institutions.
Why buy this class of phantom
✔
✔
✔
✔
Confidence in target localisation
When geometry matters, independent physical verification becomes essential.
Auditable measurement chain
Traceability and stated uncertainty strengthen governance, reporting, and client confidence.
Temperature calibration
Temperature correction for sub millimeter accuracy to 400mm FOV.
Lightweight and modular
Each plate weights <2kg and our multi-plate sysytem enables expansion for any coverage.
Designed for Measurable Performance
GeoMatrix Large is supplied with dimensional reference measurements for in-plane distances in the X and Y axes, obtained using calibrated instrumentation and reported with stated uncertainty. These results provide NIST-traceable reference values, linking phantom dimensions back to recognised measurement standards.
Maximum Deviation from Nominal Distance
Distance
100 mm
ΔX 0.14 mm
ΔY 0.13 mm
Diagonal 0.12 mm
Distance
200 mm
ΔX 0.21 mm
ΔY 0.22 mm
Diagonal 0.17 mm
Distance
300 mm
ΔX 0.25 mm
ΔY 0.24 mm
Diagonal 0.22 mm
Distance
400 mm
ΔX 0.31 mm
ΔY -
Diagonal 0.23 mm
Distance
500 mm
ΔX -
ΔY -
Diagonal 0.26 mm
*Diagonals are reported where exact 100 mm increments can be achieved.
Sample Measurement
See real distances across the GeoMatrix grid using calibrated geometry and uncertainty propagation by selecting points on the grid below.
Start Measuring with Confidence
Speak to UKMR about GeoMatrix Large for MRI geometric distortion assessment. We can provide product details, metrology documentation, and guidance on integrating a hardware-first phantom into your existing QA workflow.