CIRS Model 603-GS was designed to assess MR image distortion in Stereotactic Radiosurgery Planning. It’s also a useful tool for verifying image fusion and deformable image registration algorithms used in various treatment planning systems. The tissue equivalent, anthropomorphic design closely matches a clinical imaging scenario. The phantom can be imaged using X-ray, Computed Tomography and Magnetic Resonance. It images well with all MRI sequences tested to date, including T1 weighted, T2 weighted, 3D Time of Flight, MPRAGE and CISS.
The skull is manufactured from a plastic-based trabecular bone substitute, and the interstitial and surrounding soft tissues are made from a proprietary signal generating water-based polymer. The entire phantom is encased in a clear plastic shell to protect gel from desiccation. It’s supplied with specially designed pads that allow fixation with any stereotactic frame or mounting devices for end-to-end testing. The phantom is also suitable for frameless SRS QA.
The entire inter-cranial portion of the skull volume is filled with an orthogonal 3D grid of 2.5mm diameter cross-like shaped rods spaced 10mm (I-S), 10.5mm (AP) and 11mm (L-R). Extra material added in the grid intersections increases grid signal. Five extended axis-rods intersect at the reference origin of the grid. The end of each extended axis is fitted with CT/MR markers allowing for accurate positioning with lasers and co-registration of CT and MR image sets.
The phantom includes right and left air voids, 3 mm in diameter by 17 mm long to simulate each ear canal for evaluation of potential distortions commonly found in clinical settings.
For users interested in image fusion studies, the phantom can be purchased as a kit to include a serial-number specific CT DICOM Data set for reference. CIRS can also offer value-added options and services such as attachment of customer specific registration devices and inclusion of special point markers.
Features:
Provides a realistic anthropomorphic scenario for CT and MR imaging
Presents simulated bony anatomy as rigid landmarks for image fusion
Unique inter-cranial 3D grid design used to assess spatial distortion
Special pads compatible with all fixation frames
CT/MR markers facilitate positioning and image registration
CIRS Model 603-GS was designed to assess MR image distortion in Stereotactic Radiosurgery Planning. It’s also a useful tool for verifying image fusion and deformable image registration algorithms used in various treatment planning systems. The tissue equivalent, anthropomorphic design closely matches a clinical imaging scenario. The phantom can be imaged using X-ray, Computed Tomography and Magnetic Resonance. It images well with all MRI sequences tested to date, including T1 weighted, T2 weighted, 3D Time of Flight, MPRAGE and CISS.
The skull is manufactured from a plastic-based trabecular bone substitute, and the interstitial and surrounding soft tissues are made from a proprietary signal generating water-based polymer. The entire phantom is encased in a clear plastic shell to protect gel from desiccation. It’s supplied with specially designed pads that allow fixation with any stereotactic frame or mounting devices for end-to-end testing. The phantom is also suitable for frameless SRS QA.
The entire inter-cranial portion of the skull volume is filled with an orthogonal 3D grid of 2.5mm diameter cross-like shaped rods spaced 10mm (I-S), 10.5mm (AP) and 11mm (L-R). Extra material added in the grid intersections increases grid signal. Five extended axis-rods intersect at the reference origin of the grid. The end of each extended axis is fitted with CT/MR markers allowing for accurate positioning with lasers and co-registration of CT and MR image sets.
The phantom includes right and left air voids, 3 mm in diameter by 17 mm long to simulate each ear canal for evaluation of potential distortions commonly found in clinical settings.
For users interested in image fusion studies, the phantom can be purchased as a kit to include a serial-number specific CT DICOM Data set for reference. CIRS can also offer value-added options and services such as attachment of customer specific registration devices and inclusion of special point markers.
Features:
Provides a realistic anthropomorphic scenario for CT and MR imaging
Presents simulated bony anatomy as rigid landmarks for image fusion
Unique inter-cranial 3D grid design used to assess spatial distortion
Special pads compatible with all fixation frames
CT/MR markers facilitate positioning and image registration
The Model 604-GS provides a tissue-like imaging environment for assessing geometric distortion in whole-body MRI scanners. The 604-GS is designed to assess image distortion caused by B0 inhomogeneity and nonlinearity of the magnetic gradients. Unlike other air-filled phantoms, the liquid-filled 604-GS is also sensitive to chemical shifts and susceptibility artifacts, additional causes of distortion found when encountering density differences in diagnostic MRI and radiation therapy treatment planning.
The phantom features a unique orthogonal 3D grid that provides complete geometric data throughout the imaging volume. Users can fill the phantom with the AAPM TG 100 recommended solution, or with specialized solutions for high-field MRI or unique scan sequences. Ground-truth measurements of grid locations can be obtained through CT scanning of the phantom.
The phantom is marked for ease of alignment to position lasers and is designed for use with both curved and flat gantry tables.
Features:
With a tissue-like medium MRI signal, assess image distortion due to:
B0 field inhomogeneities
Gradient nonlinearity
Chemical shifts
Susceptibility artifacts
Compatible with Distortion Check software
Submillimeter control point detection
Optimized 3D grid spacing fills entire volume
2152 control points
Easy integration and laser alignment
Ground truth files for grid available
Overall Dimensions
300 mm (L), 276 mm (H) , 330 mm (DIA)
Weight (dry)
7.7 kg
Weight (filled)
28.1 kg
Material
PMMA
Grid Spacing
20.3mm (I-S), 20.5mm (AP) and 21.5mm (L-R). Grid intersections enhanced by 6mm diameter sphere
Model 604-GS Includes
1x
Large Field MR Image Distortion Phantom
1x
Filling Funnel
10x
Extra plastic screws
1x
Harness
1x
Plastic tray
2x
User Guides
--
Unlimited scans using MRI Distortion Check Software for initial 2 year period
Software Options
603S
Distortion Check software 2 year renewal license
MR Distortion Phantoms: Automated Analysis of Distortion in MRgRT
Distortion Check is a new, cloud-based solution designed to quickly and automatically quantify distortion in MRI images. Used in conjunction with CIRS MRI Grid phantoms, the software provides the capability to quickly and accurately measure distortion throughout the entire image volume.
After detecting all grid intersections, the software registers either a CAD or CT scan ground truth to these MR detected control points. An interpolation is then performed to generate the 3D distortion vector fields.
Results can be reported in a variety of output formats including scatter plots, contour plots, box and whisker plots for trending and DICOM overlays that can be imported to 3rd party software, such as a DICOM viewer or image fusion software. The software algorithms will work with any grid configuration and CIRS employs proprietary 3D printing techniques that enable easy modification of grid phantoms to meet customer requirements.
Features:
Quickly & automatically analyze complete MR data sets
Unique grid phantoms provide physical control points throughout entire 3D image volume
Density of control points optimized to bring interpolation close to linearity
CIRS materials simulate distortion due to susceptibility and chemical shifts typical to clinical patient scans
Cloud based solution frees user of operating system and hardware constraints
Online deployment facilitates collaboration and easy review and portability of results
