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IMRT Head and Neck Phantom


Complete QA from CT imaging to dose verification  

The CIRS Model 002HN IMRT phantom is designed to address the complex issues surrounding commissioning and comparison of treatment planning systems and verification of individual patient plans and delivery.  

The CIRS 002HN phantom properly represents human head and neck anatomy in shape, proportion and structure as well as density.  This enables thorough analysis of both the treatment planning and delivery systems. The phantom is constructed of proprietary tissue equivalent epoxy materials.  Linear attenuations of the simulated tissues are within 1% of actual attenuation for bone and water from 50 keV to 15 MeV.  

The phantom is circular in shape, approximates the size of an average patient.  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® media.  Additional inserts are available to support a variety of other detectors including TLD’s, MOSFET, and diodes.  

The Model 002HN accommodates one Ready PackTM 10” x 12” films in transverse orientation, two radiochromic or radiographic 10 x 10 cm films in transverse orientation and a stack of thirteen radiochromic films pre-cut to 63.5 x 63.5 mm in three different orientations.  

The Model 002HN has an optional four 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. An optional cranial bone ring is also available.  


  • 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 ion chamber*  
  • Verify individual patient treatment plans  

IMRT Verification System  

CIRS IMRT phantoms are manufactured from tissue equivalent materials that mimic within 1% from 50 keV to 15 MeV for accurate simulation from CT planning to treatment delivery.  The interchangeable rod design allows the phantom to accommodate a multitude of dose measurement devices such as ion chambers, TLD, diodes and MOSFET's in the same location within the phantom. 

Phantom cross sections accommodate GafChromic® or standard ready-pack films.   Refer to the cavity and plug code list for available chamber cavities.   The CIRS line of IMRT phantoms is compatible with the RIT 113 software for film to plan analysis.

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