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Simultaneous acquisition of absolute, relative and point dose measurements
Intuitive, easy set-up and visualization for fast confirmation of TPS
Easy measurement at multiple points and planes, with layered phantom slabs for 3D patient simulation.
For both IMRT commissioning and routine dose verification, for comprehensive evaluation of the entire IMRT process
FEATURES AND BENEFITS
Absolute Dose:
Make absolute measurements of dose at various depths in up to 16 positions throughout the phantom with standard thimble ion chambers.
Relative Dose:
Make relative dose (fluence dose) measurements using ready pack or radiochromic film placed every 3 cm.
Easily compare film to TPS in 3D using four reference marker points in acrylic Phantom Slab. Reference marker points facilitate orientation of film, digital reconstruction and transfer of multiple coronal film views to 3D sagital and transverse images.
Point Dose:
Make point dose measurements in any position in the phantom using MOSFET diodes or TLDs. Point dose measurements are critical when evaluating dose to sensitive structures.
Simultaneous Measurement:
Make all three dose measurements simultaneously with one set up and one treatment, saving time.
Coronal film placement allows simultaneous ion chamber and film use since the planes are parallel
Treatment Planning Interface:
Interfaces with treatment planning systems as the TPS recognizes the phantoms fiducial system and anthropomorphic shape.
Bone Equivalent Plug:
Simulates bone for realistic TPS evaluation. Assists with measuring the absolute dose at isocenter near the spine.
Anthropomorphic Shape:
Anthropomorphic design provides intuitive, easy set-up for fast confirmation of treatment plan.
Bone and lung insert fields provide high gradient tissue interfaces to evaluate TPSs ability to manage these interfaces. Uncovers edge effect issues related to tissue heterogeneity.
Effectively evaluates functioning issues of upper neck and half beam block superclav fields.
Accuracy of the prescribe dose is evaluated and confirmed in simulated patient conditions in the body, excluding extremities.
Fast Set Up:
Unique, versatile design allows may configurations to simulate individual treatment plans.
Quick, easy intuitive set-up. Complete a prostate dose set up and verification in as little as 15 minutes.
Easily configure and adjust layered phantom slabs for individual 3D patient simulation.
Fine 1 mm scribed black lines for easy laser alignment positioning of phantom
Transparent Acrylic Construction:
Operator can visualize the placement of film, chambers and diodes for accurate measurements, thus minimizing registration errors.
Acrylic is characterized in TG 21 for acrylic to water conversion for high energy photon and electron beams. Water equivalent phantoms are not characterized in this protocol. Some water equivalent phantoms may only
be characterized for cobalt to ascertain their equivalence to liquid water. Since exacting measurements are essential when dealing with the small field sizes in IMRT, it is important to know the equivalent properties to liquid water that the TG 21 acrylic to water conversion provides.
For absolute dosimetry, apply correction factors for acrylic to water which are published in the TG 21 protocol. Required corrections are combined into one table based on depth and energy, allowing the application of only one correction factor.
Dose Verification Procedure:
1. Create treatment plan based on patient scans.
2. Configure the IMRT Phantom on the CT couch according to the anatomy to be treated.
3. CT scan the phantom with the selected chamber in place.
4. Import phantom scans into the treatment planning system.
5. Transpose treatment plan onto CT phantom scan.
6. Place the phantom with ion chamber, film and diodes in place on the accelerator treatment couch.
7. Treat the phantom as the treatment plan indicates.
8. Examine the output of the ion chamber (absolute dose), film (relative or
fluence dose), Mosfet diodes (point dose) and compare them to the treatment plan.
Dimensions
Height (six slabs): 18 cm (7.09)
Width (each slab): 30.00 cm (11.81)
Length (each slab): 45.00 cm (17.72)
Weight (six slabs): 22.7 kb (50.0 lbs)
Cavity Diameter: 1.90 cm (3/4)
IMRT Dose Verification Phantom Includes:
(2) Chamber Phantom Slabs with 6 cavities each for ion chamber placement. Cavity diameter is 3/4
(2) Acrylic Phantom Slabs for build-up thickness - Four 2 mm steel balls are imbedded in the slab as reference markers for 3D orientation of film on TPS.
(2 ) Lung Phantom Slabs with 2 cavities for simulated lung inserts, two
cylindrical cavities for thimble ion chamber placement and a set of two cedar lung inserts for lung simulation
(16) Solid Acrylic Plugs to fill unused ion chamber holes
(1) Solid Acrylic Plug with cavity drilled for ion chamber of your choice.
(1) Bone Equivalent Plug
(1) Lung Equivalent Set with four (4) inserts for lung phantom voids.
Item 682-705 MOSFET Diode / TLD slab, has nine channels for MOSFET diodes or TLD chips which can be placed at any point in a field for point dose measurements. The small channel size was designed not to perturb other measurements so this slab can also be used as solid slab for increased patient thickness. MOSFET diodes are isotropic for dose measurements from any angle.
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