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The programmable QUASAR™ MRI4D Motion Phantom is designed to move liquid or gel filled cylindrical inserts within a water filled body shaped oval at varying speeds and amplitudes.

The phantom is capable of moving inserts in the superior/inferior direction as well as producing a more complex 3D motion profile by twisting the insert during translation.  Interchangeable inserts are available for imaging, planning, targeting and delivery QA.

The QUASAR™ MRI4D Motion Phantom uses the same software application as the QUASAR™ Respiratory Motion Phantom to display, edit, and run patient specific respiratory waveforms. Waveforms are created using the application or imported from vendor specific MR respiratory tracking systems or from tab delimited spreadsheet files.

The software application is compatible with Windows 7 or higher, and runs on desktop or laptop computers. Create, import, edit, and save respiratory waveforms with the QUASAR™ Respiratory Motion Software application. Edit functions include adjusting the amplitude, stretching or compressing the timeline and filtering out high frequency noise, low frequency drift and cardiac signals.

Key Features

  • 100% MR Safe:
  • Optimized Shielding:
  • Multimodality:
  • Convenient Operation:
  • Patient-specific Waveforms:
  • Adaptable Motion:
  • Interchangeable Inserts:


  • Ferrous and artifact free 4D-MRI QA on systems up to 7T
  • Enables operation within the magnet bore with no induced image artefacts or RF noise
  • MRI, CT, PET and LINAC compatible for MR4D vs CT4D, MR-PET and MRgRT 4D QA
  • Control the phantom directly from the console or equipment room with included software
  • Import, create, edit and stream patient-specific or custom waveforms
  • Flexibility to move inserts with translation or with translation and rotation
  • Configurable inserts with optional targets to increase developing and testing capabilities

MReadings: MR in RT

4D-MRI Sequence for Radiotherapy Application: Validation of a Retrospective Method on a Motion Phantom

by Soléakhéna Ken

Research Engineer
Institut universitaire du cancer de Toulouse Oncopole

Abdominal motion imaging is challenging due to breathing artifacts. A widely used technique for organ motion management in radiotherapy (RT) is 4D-CT.

It consists of acquiring a breathing signal thanks to an external surrogate at the same time as repeated acquisitions of images and the sorting of the images according to the respiratory cycle obtained from the breathing signal. However, CT scans present poor contrast for soft tissue, such that the lesions are difficult to observe even when a contrast agent is used. To overcome this limitation, MR images are acquired for precise tumor delineation and in our institute, motion is managed with acquisitions triggered on exhale phase [1]. Both CT and MR images are registered on exhale phase, as these are more reproducible [2]. In this configuration, only the exhale phase of the respiratory cycle is registered, and therefore the dynamic behavior and the organ deformation during free breathing are not captured.

4D-MRI is a promising method for imaging respiratory movements. Besides excellent soft tissue contrast, the method exhibits great flexibility in selecting image plane orientations. Different strategies have been developed for organ movement consideration [3–5]. These methods are limited by the temporal resolution, as well as image quality. A novel retrospective gating approach for dynamic MR imaging during free breathing was developed by von Siebenthal et al. [3] and further improved by Celicanin et al. [6]. In this work, the innovative 4D-MRI approach has been evaluated and validated for RT application using a motion phantom.


Above: The QUASAR™ MRI4D Motion Phantom placed in the bore of the Siemens MAGNETOM® Aera 1.5T MRI system.

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100% MR Safe100% MR Safe

Efficient piezoelectric motor assembly with no ferrous content allows for quick, easy and precise operation in Magnetic Resonance Imaging suites with no projectile hazard up to 7T.

Optimized ShieldingOptimized Shielding

The patent pending piezoelectric motor design employs highly effective proprietary RF noise suppression techniques with optimized shielding to preserve MR image quality with no phantom induced image artefacts.

Compact DesignCompact Design

The MR safe motor assembly is directly-coupled to the 20 cm deep body oval phantom for easy set-up, positioning and efficient operation in the head-first or feet-first direction for commissioning and routine 4D-MRI QA.

Body Oval PhantomBody Oval Phantom

Contains offset and central cylindrical thru holes, which provide low or medium body mass attenuation, for interchangeable stationary and motion inserts.

Interchangeable InsertsInterchangeable Inserts

Includes two configurable inserts with two stems, two spherical targets and six stem base lids for testing multiple 4D motion tracking and dosimetry applications.

Workflow EfficiencyWorkflow Efficiency

Integrated phantom design along with easy-to-use motion software saves time and increases operational efficiency by reducing or eliminating the need for complex or tedious assembly before operation.

Motion QA Software Included

The QUASAR™ MRI4D Motion Phantom comes with motion QA software which allows you to create, edit and stream programmable or patient-specific respiratory motion waveforms with an editable respiratory range of 1 to 15 seconds per breath.

Pre-recorded waveforms are imported from a number of real-time respiratory gating systems as well as tab delimited spreadsheet files. Additional edit functions include adjusting the amplitude, stretching or compressing the timeline and filtering out high frequency noise, low frequency drift and cardiac signals.

Software Capability Highlights

  • Import patient-specific waveforms
  • Create custom waveforms
  • Edit patient-specific & custom waveforms
  • Adjust the amplitude, stretching or compressing the timeline
  • Filter out high frequency noise, low frequency drift and cardiac signals

Compatible with Windows 7 or better


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