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IMRT Pelvic 3D Phantom

IMRT Pelvic 3D Phantom
Item Number :

CIRS IMRT Pelvic 3D Phantom


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CIRS IMRT Pelvic 3D Phantom.

The IMRT Pelvic 3D phantom properly represents human pelvic anatomy in shape, proportion and structure as well as density. This enables thorough analysis of both the imaging and dosimetry system.

•  Verify heterogeneity corrections.

•  Correlate CTU to electron density.

•  Check dose distributions in sensitive areas.

•  Check depth doses and absolute dose.

•  2D and 3D isodoses.

•  Calibrate film with an ion chamber.

•  Verify individual patient treatment plans.

The phantom is elliptical in shape, approximates the size of an average patient, and has a tissue equivalent, three dimensional skeleton. Tissue equivalent interchangeable rod inserts for ionization chambers allow for point dose measurements in multiple planes in the phantom and film calibration. The phantom also supports film dosimetry with not only standard radiographic films but also GafChromic® media1. Additional inserts are available to support a variety of other detectors including TLD’s, MOSFET, and diodes.

The IMRT Pelvic 3D Phantom includes four different Electron Density reference plugs which can be interchanged in five separate locations within the phantom.  The surface of the phantom is etched with grooves to ensure proper orientation of the CT slices and accurate film to plan registration.

Item 682-515 includes the following:

(1)  5 cm tissue equivalent reference section for interchangeable electron density inserts.
(10) 1 cm thick contiguous 3D pelvic sections each drilled to accommodate rod inserts.
(1)  Homogeneous section that accommodates Film Stack for Small Volume 3D Image Reconstruction Item 682-527 and Gel Dosimetry Cassette Item 682-528.
(1)  Film Stack for 3D reconstruction.
(5)  Water equivalent rods inserts (2.5 cm dia x 5 cm long).
(20) Bone equivalent solid disks (2.5 cm dia x 1 cm thick).
(30) Water equivalent solid disks (2.5 cm dia x 1 cm thick).
(1)  Electron density reference plugs, (set of 4: lung, bone, muscle, adipose).
(1)  Alignment base.
(1)  Holding device.
(1)  Set of CT to film fiducial markers.


Overall Size:
  14" x 15" x 9" (35.6 cm x 38.1 cm x 22.9 cm)
28 lbs. (10.5 kg)

Phantom Body:
Tissue Equivalent Epoxy Materials
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.

1The CIRS line of  IMRT phantoms is compatible with the RIT 113 software for film to plan analysis. GafChromic® is a registered trademark of International Specialty Products, Wayne, NJ