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 Correct alignment of the light field with the radiation field is essential for reliable set-up and treatment. It is recommended to do this alignment check at least once a week. The Radiation / Light field should correspond to within ± 2 mm at SSD.
The X-Lite is a fluorescent plate that allows visualization of accelerator radiation fields quickly and directly. The plate is activated by ionizing radiation, producing a green fluorescence which is clearly visible for a few minutes after the radiation stops. The 5 x 5, 10 x 10, 15 x 15 and 20 x 20 cm active areas are permanently marked with field scales in centimeters.
A protective red filter prevents activation of the phosphor by the light field from the gantry head or by ambient light. Irradiation photons and electrons penetrate the filter to activate the plate.
Using X-Lite is easy and alignment checks can be part of the daily
routine. With the filter in place, align the X-Lite with the light field according to the scale on X-Lite. Put any required build-up material on the plate and irradiate. Remove the filter from X-Lite and check the radiation field alignment to the field light alignment.
It is not necessary to wait for the afterglow to fade between irradiations, since the contrast is high as long as the following irradiation uses the same dose or higher
Specifications
Active Area: 23 x 23 cm
Deviation Scale: ± 5 mm in steps of 1 mm from each field scale.
Scale Accuracy: ± 0.1 mm
Fluorescence: Green (max 530 nm)
Fluorescence Lifetime: Readable 2-4 minutes after radiation
Fluorescence Intensity: 240 mcd/m2 1 min after irradiation
150 mcd/m2 2 min after irradiation (irradiation with 6 MV at 100 cm SSD, 2 Gy dose, 13 mm build-up)
Energy Range: > 1 MeV
Maximum Dose: 6 Gy/exposure
Radiation Type: Photons, electrons
Daylight Filter: Red, removable
Material: Plexiglass / polycarbonate
Operating Temperature: 15 - 45° C
Dimensions: 32 x 27.6 x 1.4 cm
Weight: 3.1 lbs
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