Pro-CT mk II


The Pro-CT mk II phantom may be used for carrying out acceptance and constancy tests of computed tomography systems according to IEC 61223-3-5 and the AAPM (American Association of Physicists in Medicine) guidelines. This phantom consists of several test modules placed inside a cylindrical container that can be mounted either directly on a holder of the CT table or on an adjustable stand. It allows accurate alignment for measurements on and off the table. Markings on the phantom and leveling aids provide further facilitation of the positioning process.


The Phantom can be used to do the following tests:

  • Geometric distortion,
  • CT number (HU) measurement,
  • Noise / Uniformity,
  • Artefacts,
  • MTF,
  • CNR,
  • Spatial resolution,
  • Spatial resolution in Z dimension,
  • Contrast resolution,
  • Low contrast resolution,
  • Slice profile,
  • Alignment,
  • Linearity,
  • Beamwidth.


Technical data (can be modified to customer specifications):

  • Main module contains PMMA section with an array of holes 2mm in diameter, 4mm deep, placed at 10mm intervals,
  • Outside diameter 230mm,
  • Length 250mm,
  • Optional external beam hardening rings:
    • 380mm outside diameter (04-317),
    • 350mm outside diameter (04-318),
    • 300mm outside diameter,
    • 300 – 380mm outside oval diameter (04-319),
    • 450 – 550mm outside oval diameter (04-320),
  • Positioning stand for on and off table measurements,
  • Carrying case.


Low contrast module

  • diameter: 210mm,
  • thickness 30mm,
  • made of PMMA,
  • contains three groups of low-contrast objects. In each group, there are rods of the same density, 20 mm in height and with a diameter ranging from 2 to 15 mm. Contrast difference between groups and surrounding material is 0.3, 0.6 and 1%,
  • optional subslice targets having a nominal 1.0% contrast and z-axis lengths of 3, 5, and 7 mm. For each of these lengths, there are objects of 3, 5, 7 and 9 mm in diameter (04-311),
  • optional stacked 25 mm diameter contrast-to-noise discs made of aluminum, PTFE, POM-C (delrin), PE-300 and air suspended in PMMA (04-312).

Sensitometric / contrast module

  • diameter: 210 mm,
  • thickness: 30 mm,
  • Length 250mm,
  • contains 9 sensitometric samples shaped like rods (ø25 mm): PTFE, PE-300, POM-C, ABS, PA-6, PET, air, water and PMMA – modules body,
  • optional insert with 3 Ti rods 5mm in diameter (04-315).

Geometry module

  • diameter: 210mm,
  • thickness 30mm,
  • contains two pairs of aluminium wire ramps whose slope angle tangent is equal to 0.5.,
  • middles of ramps intersect on the same plane allowing very precise evaluation of the slice location,
  • contains 8 rods from the air in the vertices of the regular octagon close to the outer perimeter of the phantom for evaluating symmetry and circular geometry,
  • optional eight spheres to evaluate the scanner’s imaging of subslice spherical volumes, diameters: 1.0, 1.5, 2.0, 3.0, 4.0, 6.0, 8.0 and 10.0 mm (04-313).

Spatial / high contrast module

  • diameter: 210 mm,
  • thickness: 30 mm,
  • contains 13 concentrically placed high contrast elements for spatial resolution evaluation from 1 to 13 LP/cm,
  • two tungsten carbide beads ø0.28 mm for MTF and SSP calculation,
  • Linear Spread Function (LSF) PTFE / PMMA interface,
  • Point Spread Function (PSF) - 0.25 mm stainless steel wire in air,
  • optional, additional concentrically placed high contrast elements for spatial resolution evaluation from 14 to 30 LP/cm (04-314).

Water filled module

  • diameter: 210mm,
  • thickness 40mm,
  • screws for easy fill up and empty procedures.

Optional electron density module (04-316)

  • diameter: 210 mm,
  • thickness: 30 mm,
  • module made of PMMA,
  • contains samples of 10 different rod-shaped materials (25mm diameter) with known physical and electron density corresponding to the following tissues: lungs (inhale), lungs (exhale), breasts (50.50), dense bone, bone marrow, liver, muscles, adipose tissue; additionally, a sample with water and a titanium rod.