IMRT Head and Neck Phantom

Model 002HN
COMPLETE QA FROM CT IMAGING TO DOSE VERIFICATION

The CIRS Model 002HN IMRT Phantom is designed to ad- dress the complex issues surrounding commissioning and comparison of treatment planning systems while providing a simple yet reliable method for 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. It’s circular in shape and 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 Model 002HN 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. It accommodates one Ready PackTM 10 x 12 in. 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.

Features:
  • 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.

*NOTE: This product or an optional accessory of this product requires a CIRS dosimetry cavity code before an order can be placed. Please refer to the Dosimetry Cavity Codes document to identify the CIRS code for the probe you intend to use with this product.

The 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.

Data Sheet

IMRT Head and Neck Phantom: Data Sheet

Dosimetry Cavity Codes

Cavity Codes for Dosimetry Devices

References

Publication References

Altman MB, Vesper BJ, Smith BD, et al. Characterization of a novel phantom for three-dimensional in vitro cell experiments. Physics in Medicine and Biology. 2009; 54(5):N75-N82. View

Bragg CM, Wingate K, Conway J. Clinical implications of the anisotropic analytical algorithm for IMRT treatment planning and verification.Radiotherapy and Oncology. 2008; 86(2):276-284. View

Almeida, I., L. Schyns, M. Ollers, et al. “Dual Energy CT Quantitative Imaging: A Comparison Study between Twin-Beam and Dual-Source CT Scanners.” Medical Physics, 2016. Web. View

Jong, WL, NM Ung, and A. Vannyat. ““Edge-on” MOSkin Detector for Stereotactic Beam Measurement and Verification.” Elsevier, 2017. Web. View

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