Quality Assurance System for Advanced Radiology and Radiotherapy 
Modus offers a range of cost-effective and innovative quality assurance tools for imaging, image guidance and radiotherapy.
QUASAR™ tools are a valuable part of any quality assurance program. Designed by and for medical physicists, QUASAR™ quality assurance tools provide you with confidence that every patient is getting the best possible care.
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what we offer
QUASAR ADQ Logo QUASAR™ ADQ  software is a time-saving web-based application designed to improve radiation treatment planning QA by analyzing the differences between machine log files and planned treatments for every field, every arc, every fraction, every delivery, every day… automatically!

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eQA 2.0 QUASAR™ eQA 2.0 software simplifies Linac QA through automated EPID image analysis. This time-saving application automates the analysis and reporting for important TG142 recommended QA tests. Using QUASAR™ eQA 2.0 and your EPID eliminates the need to use film for these tests.

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Penta-Guide QA Software QUASAR Penta-Guide software is designed to simplify and enhance daily cone beam CT QA through automated image analysis. This time-saving application automates the analysis and reporting for kV-MV projection images as well as 3D cone beam CT images.

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IsoCenter Cube QA Software QUASAR IsoCenter Cube is designed to provide information needed to clinically implement a modified Winston-Lutz test for IGRT accuracy. With the new Analysis Software you can analyze EPID radiation field exposures, analyze various shaping devices, report left/right, superior/inferior and anterior/posterior errors at configurable gantry, collimator and table angles.

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QUASARMRID3D Geometric Distortion Analysis System is a new, patent pending, cost-effective QA system for quantifying geometric distortion in 3D MR images. Analysis is performed on images for diagnostic and guidance applications. Unlike other distortion analysis products, which only sample a few imaging planes, QUASAR™ MRID3D analyzes the entire 3D field of view in a single acquisition.

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QUASAR Dynamic Contrast Enhanced CT (DCE-CT) is routinely used for cancer imaging and staging. Contrast agent (Iodine) injections lead to a large range of density values in vessels of different size and orientation. These variables, although important, are not fully tested with current QA techniques.

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GRID 3D QA Software 
QUASAR GRID3D Image Distortion Analyisis System is designed to evaluate image distortion in 3D MR images for stereotactic radiosurgery (SRS). The System is comprised of a phantom and analysis software which work together to produce a 3D map of spatial distortion with submillimeter accuracy throughout a volume of interest.

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QUASAR Testimonial

The Importance of Confidence

“AAPM TG-53 made clear recommendations on multiple tests that need to be considered for evaluating the dosimetric and nondosimetric components of radiation therapy planning systems. QUASAR™ is a very important component of any radiation therapy department’s quality assurance toolkit. It ensures that all your equipment is working together. Ultimately, it provides confidence that your patient is getting the best possible treatment.”

Manager, Clinical Physics
London Regional Cancer Program


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Crosshair & Field Edge Markers
Used as image reference detection markers in order to calculate pixel scaling and identify the center and size of a light field.
Optional Inserts
Increase IGRT and Gated QA test capabilities with interchangeable inserts for the QUASAR™ Respiratory Motion Phantom.
Rotation Stage
Adds non-linear motion to the QUASAR™ Respiratory Motion Phantom to enable inserts to rotate as they translate.
Respiratory Motion Assembly
An easy and cost-effective way to add IGRT Gating capabilities to the QUASAR™ Multi-Purpose Body Phantom.
Winston-Lutz Wand
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Winston-Lutz Wand
A device used in conjunction with the MV portal imager and the MLC’s or x,y jaws to identify the true isocenter of the LINAC.
Penta-Guide Lehmann Yoke
The QUASAR™ Penta-Guide Phantom comes with a Lehmann Yoke for verifying the source to surface distance (SSD) indicator.
Penta-Guide Hood
Used to confirm that the Varian Frameless Array or other visual position indicator is aligned with the CBCT and OBI.