Linac Radiosurgery Phantom

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PIXY Teaching Phantom
Section Phantoms
Wounded Willy/Damaged Debbie
Mammo II Phantom
Lung/Chest Phantom
Angio Head Phantoms
CT Head Phantom
Dynamic Breathing Phantom
ART - Radiation Therapy Phantom
Radiation Therapy Brassiere
Linac Radiosurgery Phantom
Lawrence Livermore Phantom
Fission Phantom
Thyroid Phantom

Linac Radiosurgery and the Gamma Knife Phantom

SPHERICAL PHANTOM to Check Mechanical and Dosimetric Parameters of Treatment Units


Homogenous dry water phantom with precise spherical shape 16 cm diameter


Displacement of maximum dose from center of sphere shows degree of accuracy and stability of the system


Checks the dose-calculation algorithm for a homogenous sphere


Dosimetry in the Spherical Phantom

When the center of the sphere is used as the target for testing the treatment unit, it must indicate the relationship between the point of maximum dose and the target. These should closely coincide for an accurate system.

A three-dimensional dosimetry cylinder at the center of the sphere measures both the deviation of the maximum dose from the target and the gradient of the dose along the three orthogonal axes of the sphere.

The TLD dosimetric cylinder is a stack of dry-water disks of 44 mm in diameter. Seven of the disks have concentric rings of holes for TLD rods, 1 mm in diameter and 3 mm long. Disk #4 is in the central plane of the cylinder. A smaller target disk is at the center of this disk. It has a Hounsfield number of about 130 for visibility in a CT scan.

The disks are assembled tightly by two nylon rods and round, blind nuts, which locate the cylinder precisely, linearly and angularly, in both sphere and head.

The Film Dosimetric Cylinder

This is an optional cylinder, interchangeable with the TLD cylinder. It is built up of 11 film disks and 12 dry-water disks with the same nylon assembly rods and blind nuts.

A simple fixture is supplied so the user can punch the film disks from film sheets.

Standard Cone

This is a dry-water cone, which fits precisely in a recess in the sphere. It accepts the dosimetric cylinder (TLD or film). It houses the dosimetric cylinder at the center of the sphere.

Optional Cone

This is molded to locate the measuring volume of an ion chamber at the center of the sphere. This cone is custom-molded to suit the particular ion chamber specified by the customer.

Head Phantom to Check Accuracy of the Treatment

bulletTotal System Quality Assurance
bulletChecks the dose calculation algorithm with and without correction for tissue heterogeneities
bulletMeasures the dose delivered to intracranial lesions


Dosimetry in the Head Phantom

Provisions are made for installation of the dosimetric cylinder at two locations in the cranium. One is on the CC axis of the head close to the apex. The other is near one side of the head at about ear level. Both cylinders are perpendicular to the transverse planes of the head.

Since the dose at only one location is to be measured at a time, the other location is filled with a dry-water cylinder with no dosimetric provisions. The target can be located uniquely by an initial CT scan.









Catalog Numbers

ST-1100A SPHERICAL PHANTOM SYSTEM  Includes the following:   ST-1150A HEAD PHANTOM            Includes
ST-1101 Sphere with Standard Recess for Truncated Cones   Includes one TLD Dosimetric Cylinder and one One-Piece, Dry-Water Cylinder to Fill other Cavity
ST-1102 Truncated Cone for TLD and film Dosimetry  

Includes 4 Spare Nylon Assembly Rods and 8 Spare Blind Nylon Nuts

ST-1103 TLD Dosimetric Cylinder    
ST-1104 Adaptor for Dosimetric Cylinder   Options

Includes 4 Spare Nylon Assembly Rods and 8 Spare Blind Nylon Nuts

  ST-1115   Punch for Film
Options     ST-1116   Film Dosimetric Cylinder
ST-1106 Truncated Cone for Ion Chamber (Includes molding or machining to install ion chamber at center of sphere to user's specification)    
ST-1116 Film Dosimetric Cylinder    
  NOTE: If both the sphere and head are purchased, only one dosimetric cylinder is needed    

We also offer our Whole Body Pixy, Wounded Willy and Damaged Debbie along with sectional phantoms for all your modalities.


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Simply call 440-942-1241 to request your pricing.

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 Download our Quote Request form  (type right in the PDF file or write in it), and email it to

Copyright 2004 JZ Imaging & Consulting
Last modified: 07/08/14