IMRT Head & Torso Freepoint Phantom

Model 002H9K
Complete QA from CT Imagine to Dose Verification

 CIRS offers a variety of IMRT phantoms to match the most common IMRT treatment areas including prostate, head and neck, breast and lung. Once the only way to do IMRT/VMAT QA, phantoms like the 002H9K are used today for more intensive investigations, especially during commissioning, research, and end-to-end testing. 

The Model 002H9K was designed in collaboration with David D. Loshek, Ph.D. With the H9K, choose any point dose location within a circular area with a 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. 

Tissue Equivalent Technology

Our IMRT 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. These unique materials eliminate the need for correction factors, thus improving accuracy and saving time. This phantom simulates the patient through the entire process from CT data acquisition and planning to delivery and dose verification. 

  • Ionization chambers, TLD, MOSFET and Diodes easily positioned using interchangeable rods*
  • Choose any point dose location by rotating the cylinders
  • Use radiographic film dosimetry
  • 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
  • Calibrate with film with ion chamber and other detectors
  • Designed to accommodate additional, optional breast attachments

IMRT Verification and End-to-End Solution

CIRS IMRT phantoms are manufactured from tissue equivalent materials that mimic within 1% from 50 keV to 15 MeV for accurate simulation during all necessary steps of IMRT verification. 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.(1)s.

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.

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.

Data Sheet

IMRT Head & Torso Freepoint Phantom: Data Sheet

Dosimetry Cavity Codes

Cavity Codes for Dosimetry Devices

Grządziel, Aleksandra; Gądek, Adam; Bekman, Barbara; Wendykier, Jacek; Ślosarek, Krzysztof; 'Synthetic CT in assessment of anatomical and dosimetric variations in radiotherapy-procedure validation'. Polish Journal of Medical Physics and Engineering. 2020; 26 (4): 185-192. Sciendo. View
Crocker JK, Ng JA, Keall PJ, Booth JT. Measurement of patient imaging dose for real-time kilovoltage x-ray intrafraction tumour position monitoring in prostate patients Physics in Medicine and Biology. 2012; 57(10):2969-2980  View
Schombourg K, Bochud FO, Mirimanoff RO, Moeckli R. 3D dose reconstruction for narrow beams using ion chamber array measurements. Z Med Phys. 2012;22(2):123-32.  View
Wallace D, Ng JA, Keall PJ, et al. Determining appropriate imaging parameters for kilovoltage intrafraction monitoring: an experimental phantom study. Phys Med Biol. 2015;60(12):4835-47.  View
Alnaghy, S., Deshpande, S., Cutajar, D., Berk, K., Metcalfe, P., & Rosenfeld, A. (2015). In vivo endorectal dosimetry of prostate tomotherapy using dual MOSkin detectors. Journal Of Applied Clinical Medical Physics, 16(3). doi:10.1120/jacmp.v16i3.5113.  View
Byrne, M., Y. Hu, and B. Archibald-Heeran. "Evaluation of RayStation Robust Optimisation for Superficial Target Coverage with Setup Variation in Breast IMRT." Australas Phys Eng Sci Med, 31 Aug. 2016. Web. View
Nakamura S, Okamoto H, Wakita A, et al. A management method for the statistical results of patient-specific quality assurance for intensity-modulated radiation therapy. J Radiat Res. 2016;  View


Model: 002H9K Modality: