SOPHISTICATED SCIENTIFIC DESIGN
Optimal field strength for radiation therapy
MRI SYSTEM
One of the most significant advantages of MRIdian Linac is that it integrates an MRI system with a Radiation Delivery System. The MRI component of MRIdian Linac captures soft tissue images of the patient’s body simultaneously during treatment. We have engineered our MRI system to be able to produce high-quality images using a low field strength 0.35 Tesla (T) magnet.
One of the key benefits of this design is that it provides optimal field strength for radiation therapy. The 0.35 Tesla magnet allows the system to avoid the image artifacts and distortions in the dose distribution that occur when using a high field strength magnet. MRIdian Linac’s low field MRI allows for geometrically precise images, without susceptibility distortions or chemical-shift artifacts, and accurate dose distributions. Furthermore, at 0.35 T, owing to the lower radiofrequency (RF) excitation frequency, RF induced tissue heating is a non issue, allowing uninterrupted MR imaging of the patient. The MRI imaging system fits in standard vaults and has unique pop-apart design as shown below to enable nondestructive rigging.
Another feature of our patented design is the split superconducting magnet. This addresses technical complications that can arise from combining an MRI with a linac because the split magnet allows for unobstructed beam path through a central gap.
RADIATION DELIVERY SYSTEM
Radiation is delivered from a compact inline S-band 6 MV standing wave linac with side coupled cavities. The flattening filter free linac is designed to deliver 600 cGy/ min. The highlight of the MRIdian Linac design is the patented magnetic and RF shielding that isolates the workings of a linac and the MRI system from each other. A linac emits RF energy that may interfere with the MRI image acquisition process and affect MRI image quality. MRIdian Linac uses copper shields enforced with carbon fiber for RF shielding. The combination of the materials reduces RF leakage from the linac to almost zero, ensuring zero impact on the MR image quality. The linac gantry is located in the central gap of the split super conducting magnet. ViewRay has developed specialized magnetic shielding technology consisting of concentric steel shells that create a central magnetic void at the linac components, in the otherwise uniform magnetic field of the MRI.
INTERVENTIONAL
MRI-IMAGING SYSTEM
- 0.35 T MRI does not distort patient images or dose distributions
- 50 cm diameter of spherical volume (DSV)
- Allows unobstructed beam path
- Designed for simultaneous soft-tissue imaging during therapy
- Low-field ensures no RF induced heating in patients
- State-of- the-art split gradient coil with massive cooling capacity for unlimited fast scanning
- Low- density uniformly radiation-attenuating receive coils ensure superior image quality and optimal dose distributions
- 70 cm bore diameter accommodates large patients
- Fits in standard vaults with “pop-apart” design for nondestructive rigging and installation
INTELLIGENT AUTOMATED SOFTWARE
- On-table Adaptive Treatment Planning with autocontouring, deformable image registration, real-time Monte Carlo calculation and full scale IMRT and SBRT optimization in under 2 minutes
- Real-Time MRI-guided tracking of soft tissue to control beam delivery via on-the-fly target registration and real-time beam control
- Comprehensive Database and Informatics System captures all simulation, treatment planning and the treatment delivery information
- Automatic archiving of all parameters, images, treatment plans and accumulated dose to target via deformable imageregistration and Monte Carlo simulation
LINAC-BASED RADIATION THERAPY SYSTEM
- Flattening filter free design enables dose rate >600 cGy/min
- Enables fast IMRT, SBRT or onformal external beam radiation therapy
- 138-leaf Double-Focused Double Stacked Multi-Leaf Collimator (MLC) system for reduced penumbra and minimum interleaf leakage
INTEGRATED WORKFLOW
- Integrated console for patient positioning, on-table dose prediction, treatment plan optimization and replanning, real-time tissue tracking and treatment
Treatment Planning Station
- Support for multi-modality image based reviewing, contouring, treatment planning and treatment monitoring
Automatically Updated Database Server
- Captures all patient and machine data
COMPARISON
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| Integrates an MRI system with a Radiation Delivery System. | ||||
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| No ignota fuisset vis Parametar | Text goes here | Text goes here | Text goes here | Text goes here |
TREATMENT FLOW
- Patient Setup
- Auto-Contour
- Dose Prediction
- Re-Optimization
- Track & Verify
- Treatment
- M.D. Review
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440-703-3210