CBCT Electron Density Phantom

Model 062MA

The Cone Beam (CBCT) Electron Density Phantom is an extended version of the CIRS Model 062M Electron Density Phantom and specifically designed for Cone Beam CT Imaging systems. Preliminary data shows that there may be differences between the HU readings for Diagnostic CT and Cone Beam CT. The geometry of the Cone Beam CT requires additional material and suggests that off central axis measurements should be taken.

The phantom was designed in collaboration with Dr. Peter H. Cossmann, PhD to provide a reliable tool for CT number to electron density calibration in volumetric imaging. Reliable CT calibration curves help enable treatment plan adaptation directly from Cone Beam CT data. Additionally, the phantom can accommodate any ion chamber for dose measurements and validation of heterogeneity correction based on the corrected CT calibration curve.

Our Model 062MA CBCT Electron Density Phantom’s size covers geometries for imagers with dimensions of up to 40 cm x 40 cm. It is made of Plastic Water® and contains the same set of tissue equivalent electron density inserts as the standard Model 062. Additional interchangeable slabs allow for repositioning of the electron density section with an increment of 2.5 cm.

The 062MA is just one of three configurations available as a part of the Cone Beam CT Electron Density & Image Quality Phantom System.

  • Evaluate CT scan data
  • Correct for inhomogeneities
  • Document relationship between CT number and tissue electron density
  • Simulate indicated tissue within the diagnostic and therapeutic energy range
  • Quick assessment of distance registration (optional)

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

CBCT Electron Density Phantom: Data Sheet


CBCT Electron Density & Image Quality Phantom System: Brochure

Dosimetry Cavity Codes

Cavity Codes for Dosimetry Devices

Taniguchi, Takuya; Hara, Takanori; Shimozato, Tomohiro; Hyodo, Fuminori; Ono, Kose; Nakaya, Shuto; Noda, Yoshifumi; Kato, Hiroki; Tanaka, Osamu; Matsuo, Masayuki; 'Effect of computed tomography value error on dose calculation in adaptive radiotherapy with Elekta X‐ray volume imaging cone beam computed tomography'. Journal of Applied Clinical Medical Physics. 2021; 22 (9): 271-279. View
Ortiz Seidel, Mónica; 'Influencia de correcciones IMAR por artefacto metálico en cálculo dosimétrico de Sistemas de Planificación Radioterápica Pinnacle'. 2020; Universidad Nacional de Educación a Distancia (España). Facultad de Ciencias. View
Schröder, Lukas; Stankovic, Uros; Sonke, Jan‐Jakob; 'Long‐term stability of Hounsfield unit calibration for cone beam computed tomography'. Medical physics. 2020; 47 (4): 1640-1644. Wiley Online Library. View
Nicolas Garnier 'Simulation d’un accélérateur linéaire d’électrons à l’aide du code Monte-Carlo PENELOPE : métrologie des traitements stéréotaxiques par cônes et évaluation de l’algorithme eMC'. HAL. 2019; PhD thesis. View
Mullins, J, et al. Treatment Planning for Metals Using an Extended CT Number Scale. JOURNAL OF APPLIED CLINICAL MEDICAL PHYSICS, 2016. View