3 Systems:
CT 1 - One Moving sagittal Laser, two fixed lateral cross-hair lasers
CT 3- Three moving lines: sagittal, horizontal right and left. One fixed transverse line
CT 4 - Four Moving Lines: sagittal, transverse, horizontal right and left

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Marking The Isocentre

• One moving Sagittal Laser
• Two lateral fixed cross-hair lasers
• Numerical input of positions
• Self calibrating
• Data input via keypad
• Interfaces RS232 and RS485
• Microprocessor controlled

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The treatment couch for CT's can be moved in two axes only, up and down or inwards and outwards.
Therefore, to mark the isocentre of a tumor precisely on the skin after CT diagnosis, it is essential to be able to move the sagittal line from side to side.

The coordinates of the isocentre are determined from CT images.
Using the laser reference lines, it is then possible to mark the isocentre onto the skin by positioning the couch and moving the sagittal line.

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• Three moving lines: sagittal, horizontal right and left
• One fixed transverse line
• Data input via keypad
• Interfaces RS232 and RS485
• Microprocessor controlled
• Self-Calibrating

Rather than relying upon the vertical movement of the CT couch, the horizontal lines to the left and right can be moved vertically to transfer the coordinates from the CT image to the patients skin.
This system improves the accuracy and speed of isocentre marking.

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Marking The Fields

• Four moving lines: sagittal, transverse, horizontal right and left
• PC Controlled
• Data transfer from Therapy Planning Computers
• Record and Verify for Q.A
• Data input via keypad
• Interfaces RS232 and RS485
• Microprocessor controlled
• Self-Calibrating

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If not only the isocentre, but also complete fields are to be marked on the skin, then all laser lines must be moveable.
By using this technique it is possible to project an unlimited number of intersection points of the laser lines to form edge fields.

Even irregular shapes can be plotted.
The coordinates of the cross points must be determined with the CT-Software (CT-Simulation Option) or with Therapy Planning Software.

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• Windows NT Platform
• Download of Data Strings from Therapy Planning Computers
• DICOM 3.0/ IEC Format

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