Multi Purpose Body Phantom


A cost effective tool designed to perform both dosimetric and non-dosimetric tests on radiotherapy systems, the Multi-Purpose Body Phantom incorporates a wide variety of test objects in a solid acrylic housing. This extended design retains all the non-dosimetric capabilities of the original Body Phantom with the addition of significant dose measurement capabilities.

The QUASAR Body Phantom and its partner the QUASAR Beam Geometry Phantom were developed by Jake Van Dyk at the London Regional Cancer Centre. These phantoms are designed to enable many of the non-dosimetric quality assurance tests recommended by TG 53.

Non-dosimetric features and functions that can be tested with the QUASAR Multi-Purpose Body Phantom include:

  • Geometric accuracy of 2D images and 3D image reconstructions
  • 2D and 3D measurement tools including volume calculation accuracy
  • Automatic, semi-automatic and manual boundary identification tools
  • Auto-margining tools
  • Representation and manipulation of contoured patient anatomy
  • Dose volume histograms
  • Conversion of CT numbers to relative electron densities
  • Comparison of display on CT sims, RTPS and other imaging work stations
  • Image transfer, storage, retrieval, DICOM tools on all workstations

Dosimetric measurement capabilities include:

  • Compatible with Ion Chambers from several major suppliers
  • Ion chamber locations include on axis and multiple off axis locations for measurements in low and high gradient areas
  • Blank acrylic inserts for homogeneous density tests
  • Two lung equivalent inserts and a spine equivalent rod for a variety of inhomogeneous density tests with precisely determined, near anthropomorphic, geometry
  • Light field alignment tests

The Multi-Purpose Body Phantom is ideal for IMRT and Tomotherapy installations.

Body Phantom MP Specifications:

  • Main body component, acrylic, oval shape, 20 cm high, 30 cm wide,12 cm long
  • Three openings for cylindrical inserts, each opening is 8 cm diameter by 12 cm long
  • Electron density extension, 12 cm diameter with 5 openings at 2.5 cm diameter
  • Laser and field alignment marks
  • Materials: acrylic, delrin, polyethylene, epoxy resin (electron density rods), rubber
  • Container for storage and handling, optional shipping case
  • User's guide with quality assurance worksheets

Cylindrical inserts

  • 27 cc acrylic cube within a 125 cc Delrin cube, within an 8 cm diameter acrylic cylinder, 12 cm long
  • 20° air wedge (40 cc) within an 8 cm diameter acrylic cylinder including two Delrin cylinders: · 5 mm diameter by 5 cm long (.98 cc) · 10 mm diameter by 5 cm long (3.9 cc)
  • 60° air wedge in 8 cm diameter acrylic including three Delrin spheres 40mm, 20mm and 10mm diameter.
  • Two cedar inserts and two acrylic inserts
  • One ion chamber insert holder
  • One Bone equivalent rod 2.5cm dia - 12 cm long
  • Electron Density rods, 2.5cm diameter by 18mm long; relative electron density (RED) / Lung (Inhale) RED = 0.190 / Polyethylene RED = 0.945 / Water Equivalent RED = 1.002 / Trabecular Bone RED = 1.117 / Dense Bone RED = 1.512

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