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
Respiratory Motion Phantom Thumbnail QUASAR Respiratory Motion Phantom is a state-of-the-art breathing simulator for conducting quality assurance testing on radiotherapy systems. Using a personal computer to communicate with the Programmable Respiratory Motion Phantom, the software application downloads patient respiratory waveforms to the phantom, simulating the breathing function.

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Programmable Respiratory Motion Platform Side QUASAR Respiratory Motion Platform is designed to move your existing phantoms with programmable respiratory and sinusoidal motion profiles for patient-specific QA. The Platform’s unique multi-directional motion simulation capability allows it to move in the superior/inferior direction but can also generate a lateral hysteresis motion with amplitudes up to 1.0 cm.

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Catphan Shaker Actionshot QUASAR™ Catphan Shaker is designed to enable 4D CT image quality assurance by moving a Catphan® phantom with programmable respiratory and sinusoidal motion profiles.

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QUASAR MP BP QUASAR ™ Multi-Purpose Body Phantom is a flexible QA tool designed to perform both dosimetric and nondosimetric tests on radiotherapy systems, the QUASAR™ Multi-Purpose Body Phantom incorporates a wide variety of test objects in a solid acrylic housing.

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Penta-Guide QUASAR™ Penta-Guide Phantom is used for the commissioning and daily testing of Image-Guided Radiotherapy (IGRT) systems. The Penta-Guide ensures the accuracy of linac-mounted image guidance systems, including cone beam CT (CBCT), x-ray volumetric imaging (XVI) and on-board imaging (OBI).

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QUASAR™MRID3D 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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IsoCenter Cube QUASAR IsoCenter Cube Phantom 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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Verification Phantom QUASAR™  Verification Phantom enables accurate measurements on a wide variety of radiotherapy techniques, including IMRT, SRS and rotational therapies, such as VMAT, RapidArc™ and TomoTherapy®.

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GRID 3D Phantom 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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MLC Beam QUASAR MLC Beam Geometry Phantom is designed to address the complex non-dosimetric, beam geometry and beam imaging features of modern planning systems by testing the integrity and revealing errors in beam imaging, DICOM transfer, registration, alignment, and orientation.

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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


Cross Hairs cedar inserts thumbnail Rotation Stage Thumbnail Motion  Assembly Thumbnail
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
Lehmann Yoke Thumbnail
Penta-Guide Hood Thumbnail
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.