Spine SRS

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Setup Template

During installation, Brainlab creates default Setup templates in the service settings. These templates can only be changed by Brainlab support. If you instruct Brainlab to change the name of the default templates during installation, the default Setup template names no longer match the Setup file names in the Clinical Protocol Editor. If these names do not match, the software can no longer identify which Setup template to load when a Protocol template is selected within the software application. Instead, the software selects the next file in alphanumerical order. If this is not the correct Setup template, you must select the correct one from the drop-down list in the software.

To force the software to automatically select the correct Setup file, you have the following two options:

  • Rename the Setup template in the Clinical Protocol Editor to be identical to the Setup template in the service settings
  • Rename the Setup template in the Clinical Protocol Editor to be the first in the list alphanumerically

The parameters for the Setup templates depend on the machine.

VariableDescription

Type

Defines the type and protocol and software version.

Name

Defines the setup name.

Purpose

Defines the purpose of the setup.

Demo: Setup is provided for demo purposes only. Not for clinical use.

Clinical Use: Setup is suitable for clinical use.

Arc Duplication Optimization

Arc Duplication Optimization is enabled

Choose to enable the arc duplication optimization or use as-is. Spine metastases are located within the vertebrae, which are concave structures. Therefore, you have the option of splitting the PTV (arc duplication) to better treat concave shaped PTVs.

Yes: Enable arc duplication optimization. If the structure of the PTV meets certain requirements, the PTV will be split into one or more sub-PTVs. For each sub-PTV, the arc setup is copied and the fields of these arcs are initialized with IMRT segments covering only this sub-PTV. Once the calculation is started in the software, MLC shapes initialized for one of the sub-PTVs are allowed to cover other sub-PTVs.

No: Use arc setup as-is.

Maximum number of arcs

Enter the maximum number of arcs that can be used for treatment including arcs created by arc duplication. This value must be between 1 – 12.

Arc Planes Common Parameters

Max PTV to MLC leaf distance (mm)

Enter the maximum PTV to MLC leaf distance in the beam projection (mm). This value must be between 0 – 10 mm.

Arc Plane Definitions (Value List)

Arc Plane

Defines the numerically lower and upper gantry angles for the gantry movement of one arc candidate (°).

The software places an arc candidate in the range [Gantry Lower Angle;Gantry Upper Angle]. This means the arc is defined in a clockwise (CW) manner. For the actual treatment, the software picks the gantry rotation direction automatically, often using both clockwise and counter-clockwise (CCW) movements.

The arc length should be equal to or greater than 50°, otherwise a valid treatment plan cannot be created. Additionally, if the arc length is not divisible by 10°, the given angles are adjusted accordingly.

Examples:

a) [5;175]: arc of length 170°, movement from 5° to 175° CW, or from 175° to 5° CCW.

b) [-175;175]: arc of length 350°, movement from -175° (= 185°) to 175° CW, or from 175° to -175° (=185°) CCW.

c) [95;185]: arc of length 90°, movement from 95° to 185° CW, or from 185° to 95° CCW.

Ensure that your selected table and gantry angles do not produce table collisions.

Table Angle (°)

Enter the table angle (°) of one arc candidate. The value must be a whole number between 0 – 360°.

The table angle must be given in IEC 61217 coordinates.

Gantry Lower Angle (°)

Enter the numerically lower gantry angle for the gantry movement of one arc candidate (°). The value must be a whole number between -360 – 360°.

The value for the Gantry Lower Angle must be less than the value for Gantry Upper Angle in all cases.

The Gantry Lower Angle must be given in IEC 61217 coordinates.

Gantry Upper Angle (°)

Enter the numerically upper gantry angle for the gantry movement of one arc candidate (°). The value must be a whole number between -360 – 360°.

The value for Gantry Upper Angle must be higher than the value for Gantry Lower Angle in all cases.

The Gantry Upper Angle must be given in IEC 61217 coordinates.

Further Information on Gantry Lower Angle and Gantry Upper Angle

The software places an arc candidate in the range [Gantry Lower Angle;Gantry Upper Angle]. This means the arc is defined in a clockwise (CW) manner. For the actual treatment, the software picks the gantry rotation direction automatically, often using both clockwise and counterclockwise (CCW) movements.

Collimator Angle

Enter the collimator angle (°). The value must be between 0 – 360°.

The Collimator Angle must be given in IEC 61217 coordinates.

Art-No. 60919-40EN

Utgivningsdatum: 2019-05-22