Accurate radiation dose delivery requires daily checks of the alignment between the true radiation isocenter and the isocenters of the imaging, localization, and targeting systems. The Daily ISO Phantom provides a cost-effective, quick, and accurate means for testing isocenter coincidence.

Accurate, Economical, Easy-to-Use
With the Daily ISO Phantom, the linac lasers and light field can be “tuned” to true radiation isocenter using engraved markings on the phantom’s exterior. Light field and radiation field alignment can then be checked via integrated radiographic markers. Importantly, on-board imaging systems and EPID isocenters can also easily be assessed for true spatial alignment and coincidence with that of the treatment beam.

The Daily ISO Phantom contains a unique center point fiducial and an offset target, both ceramic and measuring 6.35 mm in diameter. The offset target helps ensure the accuracy of table offset coordinates generated by kV/MV matching -- by locating the target, moving the table by determined amounts, and verifying positioning at isocenter.

Objective Assessment
Machined with concentric circle exterior targets, the Daily ISO Phantom allows users to objectively assess all setup errors, including rotations, and to easily align to true radiation isocenter.

The Daily ISO Phantom is manufactured with machining tolerance of ± 0.02 mm, and a target positioning accuracy of ± 0.1 mm.

  • Unique fiducials produce sharp, clear images in EPID, kV and CBCT
  • Offset target fiducial checks the accuracy of couch corrections
  • Perform the following tests:
    • Check laser alignment
    • Light field size verification
    • kV and MV imager coincidence
    • CBCT process accuracy
    • OBI accuracy
    • Couch shift accuracy
    • Radiation field/ light field alignment

ISO Base

Used to position and level the phantom on conventional treatment couches, with integrated pixel calibration targets recognizable by our intuitive software


Maintains all functionality of the ISO Base, adding support for quick calculation of complex 3D shifts of delivery systems with an integrated 6DOF robotic couch

ISO Analyze

Intuitive software, compatible with both bases, and enabling user-friendly quality control of linac isocenters through analysis of DICOM images acquired with the EPID, kV and CBCT


Device Specifications


12 cm x 12 cm x 12 cm


1.7 kg


Plastic Water®

Phantom Fiducials

Qty: Four

(1) Center Fiducial

(1) Offset Target

(2) Maginification Check

Fiducials Material: Ceramic

Diameter: 6.35 mm

Phantom Obi Auto

Registration Target

Qty: One

Material: Aluminum