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.

Tech Drawing
Image Right
Magnetic Shield 1
Image 2
Image 3

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

Split Superconducting Magnet
Image Interventional

INTELLIGENT AUTOMATED SOFTWARE

Software 1
Software 2

LINAC-BASED RADIATION THERAPY SYSTEM

Split Superconducting Magnet
Linac Based

INTEGRATED WORKFLOW

Operators Console

Treatment Planning Station

Automatically Updated Database Server

COMPARISON

System Features MRIdian® Lorem Ipsum Dolor Sit Sit Amet
High-quality real-time imaging of tumors
Integrates an MRI system with a Radiation Delivery System.
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TREATMENT FLOW

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