Linac Radiosurgery and the Gamma Knife Phantom
SPHERICAL PHANTOM to Check Mechanical and Dosimetric Parameters of Treatment Units
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.
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.
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.
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
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.
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