MultiMet-WL Cube

MultiMet-WL Cube

Assure Accuracy for Off-Axis SRS Targets

The MultiMet-WL Cube quantifies margin of error for off-axis SRS targets out to 7 cm, with precision of 0.1 mm. It is designed to work as a standalone phantom, or in conjunction with the StereoPHAN™, widely used for end-to-end testing for SRS.

Features & Benefits

  • Precise phantom with 6 spherical targets (5 mm in diameter) set at precise locations
    • Quantifiable accuracy up to 7 cm off isocenter
    • Reduced likelihood of phantom placement errors
  • Surface-level cross-hair markings visible in CT imaging, easing phantom orientation and alignment to delivery system
  • Compatibility with Cone, MLC or Jaw deliveries
  • User-friendly software workflow
    • Extended Winston-Lutz (WL) analysis to calculate 3D locations of off-axis targets in patient frame of reference, helping identify and reduce positioning errors
    • Ability to identify source of error — Gantry, Couch or Collimator — in 6 degrees of freedom
    • Available as standalone application or for automated analysis within the SunCHECK™ Platform
Multimet Sp Circle

Use the MultiMet-WL Cube with StereoPHAN, or as a standalone phantom.

“This phantom… provides a simple method to verify targeting accuracy for multiple lesions with single isocenter. Its integration with the SteroPHAN™ makes it an effective supplemental tool for end-to-end testing for SRS.”

Development of a Phantom to Verify Targeting Accuracy of Single-Isocenter Multiple Lesion Stereotactic Radiosurgery, AAPM 2019

Target Locations

Bb Locations Target

Location of 6 targets within the MultiMet-WL Cube

Analysis Software Highlights

Software 1

Off-axis Winston- Lutz tests analyzed in software to determine targeting errors

Software 2

Software indicates Isocenter offsets on a dimensional plane


Dimensions: (cm3) 8.5 x 8.5 x 12.75
Targets: 6 (5 mm diameter) tungsten targets in specified locations
Target to Cross-hair tolerance: ± 0.1 mm
Target Material: Tungsten Carbide
Quantifiable Off-Axis Accuracy Range: Up to 7 cm