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The Radiosurgery System MRS-01B
Radiosugery has been established in the worldwide scene of non-invasive treatments. Its effectiveness is proven in thousands of successful cases treated since its introduction. Another factor associated with this advance was the development of more precise and more functional linear accelerators (LINAC), that provide safer and more precise treatments. All this is assisted by more and more advanced computers and software, which allows us to plan the treatments in the most adequate way.
Indicated for the not invasive treatment of encephalic lesions, the Micromar Radiosurgery System MRS-01B is an equipment that when connected to a linear accelerator allows to us to dynamically radiate in stereotactic conditions and with milimetrical precision, pre-determined targets through Computerized Tomography images, Magnetic Nuclear Resonance or Digital Angiography.
The Micromar radiosurgery system MRS-01B uses isocentric non-coplanar radiation arcs, similar to the ones used by most of the systems based on LINAC. For each one of these arcs the table of the accelerator is fixed in determined angular position and the gantry of the accelerator describes an arc while it is radiating. This model also incorporates a control and correction system that makes the verification of the stereotactic coordinates with lasers of the accelerator easier.
The figure aside represents and example of a kind of treatment with 5 arcs. For each one of these arcs the table of the accelerator is fixed in determined angular position and the gantry of the accelerator describes an arc while it is radiating.
Other factors that insure the precision of this system is the secondary collimation mode which is fixed to the accelerator, collimating the radiation strip. The cone shaped collimators produce RX strips with a circular transversal cut and diameter in the isocenter of between 4 and 30 mm. The greater the proximity to the isocenter of the secondary collimator, the smaller the shadowed zone, which increases the gradient of dosage to the boarder of the targeted volume.
With this secondary collimation device connected to the Linear Accelerator, the patient with the stereotactic rim fixed on the head and attached to the adjustable support of the table, so that, when radiated, isocentric non-coplanar arcs are generated.
The Micromar Radiosurgery System MRS-01B features a verification and correction system for the isocenter of the LINAC table. Usually the table is the element that introduces the greatest number of errors; therefore a fixation support of the stereotactic rim that has 5 degrees of freedom and a digital reference is incorporated to the table. Position it in a way that the lasers and the digital markers of the coordinates x, y and z coincide. If there is any difference, it is to be corrected using the freedom degrees that the correction support has.
The collimators are connected to a tray fixed to the gantry of the accelerator, which has fine adjustment.
For more information about the Micromar Radiosurgery System MRS-01B, click on the icon below and download the brochure.
 The Radiosurgery System MRS-01B
Software for Radiosurgery
The planning of the Micromar Radiosurgery is done by the MSA software (Micromar Software Assistance) – a Radiosurgery mode that processes images, reconstructs views, inserts curves of isodoses and also planned arcs. The images presented in 3D, make the visualizing of the treatment easier.
The software was developed to help the doctor, physician or radiotherapist during the planning and execution of the Stereotactic Radiosurgery. The system is based on the architecture of the most widely found and accessible PC hardware on the market.
 Attributes of the MSA – Radiosurgery mode:
- Automatic localization of the position of the references;
- Constant information of the stereotactic coordinates of the cursor, with correction of the angular differences between the cutting plane of the tomograph and the axis of the Stereotactic;
- Generation of coronary, sagital and oblique reconstructions from the axial cuts of the tomograph;
- Variable width of the coronary and sagital reconstructions;
- Tri-dimensional reconstructions of volumes of interest and interactive manipulation;
- Maximum of 32 isocenters;
-Maximum of 64 arcs;
- Flexible interactive optimization of the isocenter and beam geometry;
- Correction for local changes in the distance of the skin source;
- Visualization of isodoses over axial CT cuts. The isodoses can be represented in Gy and %, and also in 2D and 3D;
- Computing histograms in dose-volume for structures and target;
- Selection of collimators;
- Dynamic representation of the dose gradient;
- Introduction of the position of the isocenter, size of the collimator, etc.
- Reconstruction of different planes with extraction of volumes and support of several isocenters;
- Measurement of distances in all displays, volume calculations and support of several isocenters;
- Selection of colors of the curves and surfaces of isodose by the user;
- Point transformations incorporated to the reconstruction algorithms in order to obtain the suppression of bone repair and the accentuation of the ventricular system;
- Graphic and scale representation of the trajectories of the cannulas passing through the patient’s brain;
- Brightness, contrast and false color treatment;
- Stereotactic Zoom;
- Measurement of areas and volumes for regions of interest delineated with the mouse.
Stereoangiography:
- CT – angiography correlation.
Image Fusion:
- Fusion of CT Stereotactic images with axial, coronary or sagital RMN images (whether they are stereotactic or not);
- Fusion method, using references intrinsically or extrinsically (minimum of 4);
- Multi-mode fusion, half image, partial or window – capacity of exporting images for posterior processing with the tools preferred by the user ("BMP" file format);
- 3D representations of surfaces of equal anatomic density;
- Axial, coronary and sagital reconstructions associated to 3D representations;
- 3D representations of contours of regions of interest.
The precision of the Miscromar Radiosurgery System MRS-01B is also insured by the high quality standards in production of the equipment used. Produced accordingly to technical norms of the European Community (CE) and ISO 9001 which assure total quality throughout the production process.
System items:
- Stereotactic rim fixation support for the accelerator table with 05 degrees of freedom to correct for deviations of the table itself;
- Stereotactic rim compatible with RMN and CT with curved segment for intubate the patient;
- Hard aluminum extension posts;
- Composite fiber extension posts;
- Stainless steel screw sets of 50 and 70 mm;
- Plastic screw sets with titanium points of 35, 55 and 75 mm;
- Milimetrical reference case with fixation system to the stereotactic rim for verification of positioning of the table of the accelerator and verification of the stereotactic coordinates;
- CT references;
- Tomography table support;
- Reference system for RMN;
- Reference system for angiography;
- Tray with support for collimators;
- Collimator set with the following dimensions: 9, 12, 15, 18, 21, 24, 27, 30 and 33 mm;
- Digital Phantom for confirmation of stereotactic coordinates and verification of isocenter with cone shaped tip and spherical tungsten tip;
- Film holder system for the verification of the isocenter.
Fractioned Stereotactic Radiotherapy
The Fractioned Stereotactic Radiotherapy system was developed by Micromar in order to offer greater speed and safety in the procedures of positioning and repositioning of the patient on the LINAC.
First, Computerized Tomography is preformed, where the acquisition of images to define the target occurs.
The treatment is guided by the MSA software – Radiosurgery mode that calculates the radiation doses to be given to the patient.
Advantages:
- Greater safety to do radiation at different momements, with the efficient Scaled Mouthpiece system which allows that the patient stay in the same position of the previous radiation, so that the target is always the same;
- Reduces the time used for adjusting and positioning the patient;
- Greater safety for the execution of treatments.
Components:
Frame
Removable Anterior Segment
Tomography Reference
Scaled Mouthpiece System (L/M)
Graduated Semi-Arc
Chariot
Head support tray
Vacuum Pad (Vac Pad)
Vacuum Pump
Resin and Catalyzing Set
Scaled Mouthpiece System:
This system forms a mold with the shape of the patient’s teeth. This mold is connected to the Arc with the Frontal Post and in this way, the patient will always be with his head in the same position, because the mold will always fit perfectly in his mouth.
Vac Pad System:
The Vac Pad system was designed accordingly to the needs of modern radiotherapy. Filled with micro-spheres, the sealed bags of the Vac Pad system form a ridged and comfortable crib around the patient when the air is extracted through a valve.
The vacuum mattresses of the Micromar Vac Pad systems are produced with materials of great durability. All the Vac Pad models are washable and reusable insuring greater savings in your treatments.
For more information about the Micromar Fractioned Radiosurgery System, click on the icon below and download the brochure.
Fractioned Stereotactic Radiotherapy |
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