Comprehensive Electron Density Phantom

For the calibration of Hounsfield Unit (HU) vs. electron density of CT radiotherapy treatment plans


  • Suitable for the creation of the electron density calibration curve of computed tomography (CT) scanners for treatment planning systems (TPS)
  • Suitable for electron, photon, and proton therapy systems
  • 16 ICRU-conformal tissue-equivalent rods


The phantom excellently suited for the creation of a HU vs the electron density table for treatment planning CT (4DCT). It consists of a water-equivalent body section and a removable/standalone head section with 16 holes for exchangeable inserts that mimic real human tissue regarding its physical and electron density according to the ICRU Report 44 and 46.

The phantom is not only suitable for the high energy ranges (electron, photon, and proton therapy systems), but is also a valuable tool for kV energies in diagnostic imaging (e.g. Multi-Energy CT).

Remarkably, the phantom provides realistic tissue simulation and values also in the high-density range (bone).

  • QRM-90115        Titanium (Ø 20 mm water-equivalent rod with Ø 10 mm titanium insert)
  • QRM-90116        Stainless (Ø 20 mm water-equivalent rod with Ø 10 mm stainless steel insert)               
  • QRM-90117        Aluminum (Ø 20 mm water-equivalent rod with Ø 10 mm aluminum insert)
  • Further materials available upon request: 
    • Multiple ICRU-conformal tissue rods (further information can be found in the QRM-ICRU-Tissues brochure)
    • Bone rods with calibrated amount of Ca-Hydroxyapatite (CaHA) of 50, 100, 200, 400, 600, 800 mg CaHA /cm³ 
    • CTIodine rods (solid Iodine) with concentrations of 2, 5, 10, 15 mg I/cm³  

Comprehensive Electron Density Phantom with different tissue-equivalent rods (click to enlarge):


Body section
dimension: 250 mm x 350 mm
  height: 150 mm
Head section
diameter: 160 mm
  height: 150 mm
Tissue-equivalent rods
diameter: 20 mm
  height: 150 mm
Phantom weight: 6.0 kg
Material: Water-equivalent (CTWater) with 0 ± 5 HU (at 80-140 kV)
• CTWater (2 pcs.)
• ICRU Muscle
• ICRU Adipose
• ICRU Liver
• ICRU Brain
• ICRU Blood
• ICRU Breast (50/50)
• ICRU Cortical Bone
• ICRU Spongious Bone
• ICRU Lung (inflated)
• ICRU Lung (deflated)
• Bone HA100 (100 mg CaHA /cm³)
• Bone HA200 (200 mg CaHA /cm³)
• Bone HA800 (800 mg CaHA /cm³)
• High-density Polyethylene (PE-HD)
The phantom comes with a protocol displaying physical density, electron density, electron density relative to water and effective atomic number (other values are optional).

Related Downloads

Comprehensive EDP ( 2 MB )
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