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 Radiation / field-light congruence
Collimator field size accuracy
Isocenter rotation accuracy
Collimator, gantry, and table isocentricity
ODI accuracy
Laser alignment
Uses 10 x 12 Ready-Pack Film
The Tungsten Rotating Alignment Pattern (TRAP) Device is an easy to use multi-purpose QA test tool for daily, weekly, monthly, or annual checks of the mechanical and geometric parameters of linear accelerators and simulators.
The TRAP has a black acrylic base with a 4 wide x 8 long cutout. The cutout allows for viewing of the central axis on the plate with the gantry at 0°. The base has 3 leveling screws.
The vertical supports are black acrylic with 1 3/4 delrin knobs for rotating the plate. The knobs have spring plunger dedents every 45° for accurate positioning when rotating the plate.
The rotating plate is two white plates sandwiched together and a 10 x 12 ready pack film can be placed between them. A clamp between the plates holds the film so you dont have to do anything else to secure the film. Two half-moon cutouts on the plates allow for grasping the film to pull it out.
The top plate has 1.6 mm tungsten balls and 1.6 mm dia x 1.3 mm long tungsten rods embedded with gray epoxy which give a sharper film image. The dark markings allow for easy viewing of the field-light and central axis on the plate surface. 10 cm2 and 20 cm2 fields are defined by the tungsten balls and rods. The tungsten balls are used to make arrows so film orientation is easily seen and no film pricking is necessary. Tungsten balls are also placed at central axis and every cm from 2 cm to 13 cm and at 15 cm. Device orientation is accomplished with 0, 90, 180 and 270 markings. There are two bubble levels on the top plate which ensures level accuracy of the rotating plate.
The bottom plate has dashed lines to correspond to central axis. This allows for verification of lasers to central axis.
Specifications
Field Sizes: 10 cm and 20 cm
Rotation: 360° in 45° increments
Positioning: Self-seating dedents
Markers: 1.6 mm tungsten rods and balls
Leveling: 3-point with 2 bubble levels
Maximum Size: 33.6 cm W x 40.5 cm L x 36.7 cm H
Screen Size: 33.7 cm W x 30.5 cm L
Weight: 6 lbs
Materials: Black acrylic; White and clear engraving material
Shipping: Fully assembled
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