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Tungsten Rotating Alignment Pattern Device for CR Cassette for Accelerators and Simulators
Tungsten Rotating Alignment Pattern Device for CR Cassette for Accelerators and Simulators
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 33.7 cm W x 40.5 cm L black acrylic base with a 25 cm W x 30 cm L cutout. The base has a cutout that allows for viewing of the central axis on the plate with the gantry at 0°. The base has 3 rubber tipped leveling screws.
• Uses a Standard CR Cassette
• Radiation / field-light congruence
• Collimator field size accuracy
• Isocenter rotation accuracy
• Collimator, gantry, and table isocentricity
• ODI accuracy
• Laser alignment
The vertical supports are black acrylic with 1 3/4" delrin knobs for rotating the plate. The knobs have indents every 45° for accurate positioning when rotating. The rotating plate consists of two white plates that allow a Standard or CR Cassette to be inserted between and secured by thumb screws. Two half-moon cutouts on the plates allow for grasping the cassette making it easier to pull out.
On one plate there are 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 image. The dark markings allow for easy viewing of the field-light and central axis on the plate surface. The 5, 10 and 20 cm2 fields are defined by tungsten balls and rods. The tungsten balls are used to make arrows so orientation is easily seen. 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 on the plate. There are two bubble levels on one plate which ensures level accuracy of the rotating plate.
On the back plate dashed lines are used to correspond to central axis. This allows for verification of lasers to central axis.
Specifications
Cassette Slot Size: 28.0 cm W x 32.5 cm L x 1.4 cm Thick
Field Sizes: 5, 10 and 20 cm2
Rotation: 360° in 45° increments
Positioning: Self-seating indents
Markers: 1.6 mm tungsten rods and balls
Leveling: 3-point with 2 bubble levels
Maximum Size: 33.7 cm W x 40.5 cm L x 36.7 cm H
Overall Size: 40.5 W x 40.5 L x 36.7 H cm
Material: Black acrylic; White and clear engraving material
Weight: 14 lb (6.36 kg)
