Workflow Step

Meet ACR accreditation guidelines for CT image quality and performance evaluation with the CT ACR 464 Phantom.

Comprehensive CT Testing
Testing options with the CT ACR 464 Phantom include positioning and alignment accuracy, CT number accuracy, slice thickness, low contrast detectability, image resolution and uniformity, spatial resolution, and inter- and intra-plane distance measurement accuracy.

Proven & Versatile Design
The CT ACR 464 Phantom is made of the proven Original Solid Water® Zero HU formulation, with modules that support a variety of tests, and the capability to extend and work with other phantoms.

Four included modules support testing for:

  • Positioning and alignment, CT number accuracy and slice thickness
  • Low contrast resolution
  • CT number uniformity assessment
  • High contrast (spatial) resolution

RapidCHECK™ Integration
With direct connectivity from the CT ACR 464 Phantom to the RapidCHECK Platform:

  • Generate a complete report of your CT ACR 464 Phantom in seconds
  • Leverage RapidCHECK’s evidence-based metrics to remove evaluation subjectivity

Meet ACR requirements for CT certification.

TG-66 Compliance

The CT ACR 464 Phantom supports all image quality tests recommended by AAPM Task Group-66.

Optional Phantom Body Ring

Insert the CT ACR 464 Phantom into this body ring for better indication assessment of scanner performance for larger patients.

Optional Phantom Extensions

Extension plates accurately represent scatter effects from widebeam CT scanners.

Advanced iqModules™ Compatibility

Combine with the Advanced iqModules for enhanced, flexible image quality testing.


Device Specifications


PolZero HU Solid Water®


20.0 cm (7.9 in)


16.0 cm (6.3 in)


5.3 kg (11.7 lbs)

Imbedded Test Objects

Water Equivalent Linearity Rod

Solid Water, Zero HU

Bone Equivalent Linearity Rod

Bone tissue equivalent material

Acrylic Linearity Rod

Cast Acrylic

Polyethylene Linearity Rod

Low Density Polyethylene

Low Contrast Module Matrix

Ciba Geigy CB4 epoxy or equivalent

Low Contrast Rods

Ciba Geigy CB4 epoxy (density adjusted to yield 6 ±0.5 HU difference) or equivalent

Tungsten Carbide Beads

0.28 mm (0.011 in) in diameter grade 25 tungsten carbide beads

Line pair Material

6061 Aluminum and Polystyrene

Steel Beads Intra-module Homogeneity

Mean ROI values within any module, test objects excluded, can differ by no more than 2 HU

Intra-phantom homogeneity modules 1, 3 & 4

Average CT number a module must meet the requirements of 0 ±5 HU

Additional Accessories

Phantom Stand, Soft Case, Automated Analysis Software