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QUASAR MRID3D is a new, patent pending, cost-effective QA system for quantifying geometric distortion in 3D MR images. Analysis is performed on images for MRgRT, simulation and diagnostic imaging applications.

Unlike other distortion analysis products, which only sample a few imaging planes, the QUASAR™ MRID3D Geometric Distortion Analysis System analyzes the entire 3D volume in a single series acquisition.

The system uses a novel method based on 3D harmonic analysis of distortion by analyzing the Boundary Distortion Vector Field derived from the location of known control points on the surface of the phantom. 3D Laplace Partial Differential Equations are used to calculate the entire 3D Distortion Vector Field. 

The large, acrylic, and hollow boundary phantom features integrated feet and handles for fast and easy setup in MRI scanners and includes image analysis software with a built-in 3D DICOM Viewer and Region of Interest (ROI) selector permitting user analysis of smaller custom volumes.

Watch the Demonstration Video →

Watch the Demonstration Video →

A video demonstration of the QUASAR™ MRID3D Analysis System for quantifying 3D geometric distortion in MR images.

Read the Latest News →

Read the Latest News →

Novel phantom simplifies MRI-Linac QA
With scan times as low as 3-5 minutes at 3T, the entire QA process including set-up and data analysis is completed in under 10 minutes.

Key Features

  • Patent Pending
  • Isocenter Detection
  • Fiducial Markers
  • Reference Markers
  • Fast Processing
  • Feature-rich Graphics
  • Built-in 3D DICOM Viewer
  • Axial Plots
  • Automated Analysis
  • Trend Analysis
  • Export Results
  • Detailed Reports
  • Multi-App Phantom
  • Large 3D Volume
  • Hollow Phantom
  • Waterless Phantom
  • Complete System
  • NEMA MS 12-2016 → Compliant


  • Uses a novel method for quantifying 3D geometric distortion in MRI based on 3D harmonic analysis
  • Features an XYZ orientation and scale cuboid containing fiducials channels to easily visualize the phantom isocenter
  • Contains 1,496 precisely machined 3mm fiducial markers uniformly distributed around the phantom surface boundary
  • Contains 6 precisely machined 5mm reference fiducials to detect image position when distortion is high or correction is off
  • Acquire T1 weighted 3D isotropic GRE scans at 3T under 5 minutes or at 1.5T as quick as 10 minutes
  • Enables users to easily visualize analysis results and update visually stunning charts, graphics and plots in real-time
  • Ability to update statistical analysis in real-time within a selected region of interest (ROI)
  • User selects 2 identical MR scans with opposite frequency encode polarities to compare B0 vs Gradient distortion
  • Software automatically locates fiducials, compares it against the truth and calculates the geometric distortion for QA analysis
  • Track results over time to identify patterns, prevent potential errors and make adjustments to improve patient care
  • Capable of exporting the entire 3D Distortion Vector Field (DVF) data into Microsoft Excel (.CSV) format
  • Save distortion measurement results in PDF format to share with physicist, MRI technician and radiation therapists
  • Designed for multiple QA applications including MRI-guided radiation therapy, MR simulation and diagnostic imaging
  • 37cm x 32cm (W x L) phantom enables users to accurately simulate and QA treatment plans for a wide range of patient sizes
  • Phantom weighs 21 kg for easy and fast setup compared to similar sized water-based phantoms that weigh 41 kg or more
  • The removable end plate, XYZ cuboid and fiducial markers are delivered pre-filled with mineral oil for best scanning results
  • Maintenance free phantom comes complete with XYZ cuboid, analysis software and instructions for safe assembly
  • Phantom design permits fast, accurate, large 3D volume scanning in under 5 minutes

A better phantom measurement technique for modern MRgRT applications.

The QUASAR MRID3D Phantom contains an array of 1,502 precisely machined mineral oil filled fiducial markers for accurate and robust position detection.  The 3D spatial position of each control point, defined as the centroid of the closed end of each fiducial, is consistently fabricated to within 0.1 mm relative to the truth template derived from CAD data.

The fiducial markers with 18 mm uniform spacing conform to the NEMA MS-12 standard for precision, quantification and mapping of geometric distortion in Magnetic Resonance Imaging.

Conformance to recommendations on design and data acquisition by The Medical Imaging & Technology Alliance (MITA), a division of the National Electrical Manufacturers Association (NEMA), enables the QUASAR MRID3D Phantom to accurately measure MR image distortion at low and high field strengths, even under conditions of large distortion such as low bandwidth acquisitions with vendor distortion correction turned off.

Above: Close-up of the precisely machined mineral oil filled fiducial markers with 18 mm uniform spacing around the boundary of the phantom.

Above: The maintenance free phantom ships with pre-filled mineral oil fiducial markers for fast and easy use.

Designed for geometric dimensional stability.

The patent pending temperature compensating oil expansion reservoirs maintain geometric dimensional stability of the phantom when temperature variations are experienced in use. This eliminates a potential source of measurement error commonly found in large conventional grid phantoms, and ensures safe, leak-proof shipping.

An XYZ orientation and scale cuboid insert, located at the center of the phantom, is used to register a calibrated frame of reference and to facilitate auto pre-scanning 3 plane MR Image localizers.

Maintenance free and easy.

The physical dimensions of the phantom are 39.4 cm diameter by 39.1 cm long – with a hollow internal volume of ~25 liters, effectively removing 25 kg of weight relative to conventional solid fluid filled grid phantoms. At 21 kg the maintenance free phantom from Modus QA is half the weight of conventional solid fluid filled grid phantoms for lighter, convenient one person setup.

The phantom comes pre-filled with high T1 weighted contrast mineral oil for faster 3D scanning and dielectric-resonance-free use at high 3T fields. The mineral oil is susceptibility matched to acrylic to render susceptibility artefact negligible around the control points.

Watch Video →

Above: Susan Campbell demonstrates how simple and easy it is to setup the phantom.


Isocenter DetectionIsocenter Detection

Features an XYZ orientation and scale cuboid containing fiducial channels to enable users to easily visualize the phantom isocenter

Fiducial MarkersFiducial Markers

Contains 1,496 precisely machined 3mm fiducial markers and 6 contrastive 5mm central reference fiducials for robust position detection when imaging distortion is high or while geometric correction is turned off

Alignment CrosshairsAlignment Crosshairs

Designed to work with the MRI laser positioning system to ensure that there is no roll, pitch or yaw displacement of the phantom

Integrated Feet and HandlesIntegrated Feet and Handles

Comes with built-in 3 point contact feet for quick set-up on uneven surfaces and recessed handles for convenient carrying and easy storage

Maintenance FreeMaintenance Free

Pressure/vacuum sealed fill ports to lock-in mineral oil and prevent leaks due to changes in temperature

Geometric StabilityGeometric Stability

Integrated mineral oil thermal expansion tubes, made of blue fluorosilicone rubber, provide internal pressure relief to ensure geometric stability


Software that meets the demand for accuracy, speed, and efficiency.

The QUASAR MRID3D software application is designed with specific needs of MR medical physicists and clinical workflow in mind. Accuracy, speed, and efficiency of results, were primary considerations during the design process.

The application is optimized to run locally without any load or latency issues, which translates into less time waiting for cloud-based applications to generate 3D distortion vector fields or for a spinning wheel to stop spinning.

Above: Built-in 3D DICOM Viewer with interactive Region of Interest selector to update user-defined volumes and statistical charts, graphics, and plots in real-time.

Above: Interactive statistical graphics with unprecedented accuracy.

Algorithms that calculate the entire 3D Distortion Vector Field, automatically.

The robust software automatically identifies the location of the isocenter and control points in the acquired MR images of the phantom and uses a fully automated process to compare them against the truth to calculate the geometric distortion.

The geometric moment of distortion truth has arrived.

Sophisticated imaging processing techniques are automatically enabled to measure the distance between the locations of the fiducial markers in the distorted MR image and their known positions defined by the geometry of the phantom.

The characterization and measurement results of the geometric distortion in MR images are displayed in 3-dimensions with unprecedented details and accuracy for QA analysis.

Above: Enhanced visualization tools to explore, discover, summarize and visualize quantitative data in the way you see fit to form conclusions and make decisions.


Workflow EfficiencyWorkflow Efficiency

Automated processes are used to identify location of Control Points, quantify Geometric Distortion, calculate Distortion Vector Fields and produce Statistical Analysis.

Data CalculationsData Calculations

Complex equations and algorithms are put to use to calculate the phantom Boundary Distortion Vector Field, Volumetric 3D DVF and B0 Distortion vs Gradient Distortions.

Distortion ResultsDistortion Results

Enriched analysis tools make it easier to examine the geometric distortion measurements of a single acquisition or compare the distortion among a collection of series.

Real-time AnalysisReal-time Analysis

Sophisticated 3D DICOM Viewer with ROI selector enables users with the ability to update charts and graphs in real-time to user-defined volumes to gain further insights.

Visualization ToolsVisualization Tools

Interactive statistical graphics allow users to explore, discover, summarize and visualize quantitative data in the way you see fit to form conclusions and make decisions.

Custom SettingsCustom Settings

Control how your data is managed by adjusting settings, image viewer properties, graphic resolution display, change plot line colours and configure the database path.


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Published PapersPublished Papers

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Product Data SheetProduct Data Sheet

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