PHANTOMS FOR LINAC RADIOSURGERY ANDTHE GAMMA KNIFE
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Spherical Phantom in Stereotactic Frame Spherical Phantom to Check Parameters of Treatment Units Homogeneous dry water phantom with precise spherical shape - Displacement of maximum dose from center of sphere shows degree of accuracy and stability of the system Head Phantom for Stereotactic Radiosurgery Head Phantom to Check • Total System Quality Assurance • Checks the dose calculation algorithm with and without correction for tissue heterogeneities • Measures the dose delivered to intracranial lesions • Checks the dose-calculation algorithm The Sphere was designed in conjunction with Timothy D. Solberg, Ph.D., Co-director of The University of California at Los Angeles (UCLA) Radiosurgery Program.

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...

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 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 Disk with TLD Rods Since the dose at only one location is to be measured at a time, the other location is...

CATALOG NUMBER ST-IIOOA Spherical Phantom System ST-1 101 Sphere with Standard Recess Film Dosimetry ST 1104 Adaptor for Dosimetric Cylinder Includes one TLD Dosimetric Cylinder and one One-Piece, Dry-Water Cylinder to Fill Other Cavity. Includes 4 Spare Nylon Assembly Rods and 8 Spare Blind Nylon Nuts. Includes 4 Spare Nylon Assembly Rods and 8 Spare Blind Nylon Nuts. Truncated Cone for Ion Chamber (includes molding or machining to install ion chamber at center of sphere Film Dosimetric Cylinder If both the sphere and head are purchased, only one dosimetric Film Dosimetric Cylinder (ffip...