3 Systems:

Dorado 1 - One Moving sagittal Laser, two fixed lateral cross-hair lasers
Dorado 3- Three moving lines: sagittal, horizontal right and left. One fixed transverse
line
Dorado 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 PC or terminal 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

In addition to isocentre positions, some cancer centres mark complete field edges in one location upon the patient's skin. This is an additional QA procedure used to check the patient setup. When marking field edges it is necessary to move all laser lines. By using this technique it is possible to project an unlimited number of intersection points of the laser lines to form edge fields. Even the most irregular shapes can be plotted.

The coordinmates of the intersection points must be determined with the CT-Software (CT-Simulation Option) or with Therapy Planning Software.

 

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• Windows NT/2000 Platform
• Download of Data Strings from RTP Computers
• DICOM 3.0/ IEC Format
• Record and verification of QA
• Paperless transfer of couch coordinates

LAP IsoMark Software is used to automatically control Dorado CT-Simulation lasers. This speeds up the patient marking process and eliminates the risk of errors associated with manual data transfer.

LAP IsoMark Software facilitates the direct transfer and storage of patient data from Radiotherapy Planning Systems, including isocentre and field edge coordinates.

Coordinates for couch movements are sent from the IsoMark PC to the display on the LAP terminal, which is situated near the couch controls in the CT room. This paperless transfer of data saves printing out each set of coordinates.

Quality Assurance:

There is a two way transfer of information between LAP Dorado Lasers and IsoMark Software. The IsoMark Software sends coordinate information to each laser. The lasers move to the requested position, but do not switch on.

The microprocessor on each Dorado checks at which location the laser moved and sends it back to the PC. The PC verifies and records the position before the lasers are switched on. In systems where couch movements must be made, the lasers are still not switched on until the couch positions are confirmed via the LAP terminal.

The IsoMark PC stores patient records showing both planned and actual laser positions as records of quality.

Checksum:

All data transfer between the LAP PC and lasers is sent with a Checksum for added security against data corruption.

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