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IMRT Head and Torso Freepoint Phantom

IMRT Head and Torso Freepoint Phantom
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CIRS IMRT Head & Torso Freepoint Phantom


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CIRS IMRT Head & Torso Freepoint Phantom.

The Freepoint Phantom allows any point dose location to be selected  within a circular area with diameter of 11.2 cm by simply adjusting the two rotating cylinders.  Lung and bone equivalent rods can be positioned at any location within the circular area for assessment of heterogeneity correction.  Remove the center cylinder from the phantom body to simulate head and neck set-ups.

•  Ionization chambers, TLD, MOSFET and Diodes easily positioned using interchangeable rods.

•  Choose any point dose location by rotating the cylinders.

•  Use radiographic Ready Pack® film or Gafchromic® film.

•  Close placement of detectors to film improves film calibration.

•  CT - film markers ensure accurate film to plan registration.

•  Surfaces are etched with indices for precise alignment.

•  Configure with or without heterogeneities.

Item 682-522 Includes the following items:
(1) Water equivalent homogeneous torso section with cylindrical inserts (15 cm).
(2) Spacer slabs, 2 cm.
(1) Spacer slab , 1 cm.
(1) Spacer slab, 10 cm.
(4) Water equivalent solid rod inserts.
(1) Bone equivalent solid rod insert.
(1) Set of CT film fiducial markers.
(1) Alignment base.
(1) Holding device.

Overall Size:  17" x 15.5" x 10" (43.2 cm x 39.4 cm x 25.4 cm)
Weight: 47 lbs. (17.5 kg)

Phantom Body: Tissue Equivalent Epoxy Materials
Inserts: CIRS Tissue Equivalent Materials (epoxy resin based)

Insert Options:
Customers are encouraged to complete their order with the purchase of at least one  each of the insert option listed below.  Customer must specify ion chamber and / or cavity code.
682-533 Water Equivalent Rod Insert with Ion Chamber Cavity.
682-534 Bone Equivalent Rod Insert with Ion Chamber Cavity.


Gershkevitsh, Eduard, et al., Dosimetric Verification of Radiotherapy Treatment Planning Systems: Results of IAEA Pilot Study. 2008 Elsevier Ireland Ltd., Radiotherapy and Oncology 89 (2009) 338-346, pgs. 338-346, March 2009.

Zhao, Y. et al., Monte Carlo evaluation of a treatment planning system for helical tomotherapy in an anthropomorphic hetergeneous phantom and for clinical treatment plans. Med. Phys., vol. 35 (12), pgs. 5366-5374, December 2008.

Luo, W., et al., Analysis of image quality for real-time target tracking using simultaneous kV-MV imaging. Med. Phys., vol. 35 (12), pgs. 5501-5509, December 2008.

Brunckhorst E., et al., Commissioning of Radiotherapy Treatment Planning Systems: Testing for Typical External Beam Treatment Techniques. IAEA, International Atomic Energy Agency, IAEA-TECDOC-1583, pgs. 1-67, January 2008.

Altman, M., et al., A Novel Phantom for use in 3-dimensional In Vitro Cell Experiments. Med. Phys., vol. 33 (6), pgs. 2058-2059, Poster # SU-FF-T-40, June 2006.

*See Documents tab for ion chamber cavity code chart.



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