QUASAR™ Multi-Purpose Body Phantom

Overview

A flexible QA tool designed to perform both dosimetric and nondosimetric tests on radiotherapy systems, the QUASAR™ Multi-Purpose Body Phantom incorporates a wide variety of test objects in a solid acrylic housing.

Modus QA offers forward compatibility with the option to add motion capabilities to the Multi-Purpose Body Phantom with the addition of a QUASAR™ Respiratory Motion Assembly or QUASAR™ Respiratory Motion Platform.

Characterised by its adaptability to ongoing advances in QA technology, the QUASAR™ Multi-Purpose Body Phantom offers a broad range of applications for modern radiotherapy clinics:

Non-dosimetric test capabilities:

• 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 simulators, RTPS and other imaging workstations
• Image transfer, storage, retrieval, DICOM tools on all workstations

Dosimetric measurement capabilities:

• Verify dosimetry calculations with Ion Chamber measurements; compatible with Ion Chambers from major suppliers
• Measure in low or high dose areas with multiple measurement locations throughout the phantom
• Perform homogeneous density measurements with blank acrylic rods and inserts
• Use inhomogeneous inserts to test density corrections in an idealized near anthropomorphic geometry

Key Features

• Dosimetric and nondosimetric tests for end-to-end RT system testing
• Published pass/fail criteria for a number of tests in the TG 53 and TG 66 Reports
• Interchange inserts quickly and easily
• Used for IMRT, IGRT, VMAT, SRS and Tomotherapy
• Converts to an IGRT gating phantom with the addition of the QUASAR™ Respiratory Motion Assembly

As technology evolves, so does the range of standard inserts for the QUASAR™ Multi-Purpose Body Phantom, offering more complex QA capabilities:

• 27 cc acrylic cube within a 125 cc Delrin cube, within an 8 cm diameter by 12 cm long acrylic cylinder
• 20° air wedge (40 cc) within an 8 cm diameter by 12 cm long acrylic cylinder including two Delrin rods; 5 mm diameter and 10 mm diameter by 5 cm long
• 60° air wedge in 8 cm diameter by 12 cm long acrylic cylinder including three Delrin spheres; 40 mm, 20 mm and 10 mm diameter
• 2 cedar inserts and 2 solid acrylic inserts 8 cm diameter by 12 cm long
• 1 Ion Chamber Holder 2 cm diameter by 18 cm long drilled to match Ion Chamber
• 1 Bone equivalent (B 100) rod, 2 cm diameter by 12 cm long
• 5 Electron Density rods, 3 cm diameter by 2 cm long; Lung (Inhale), Polyethylene, Water Equivalent, Inner Bone, Dense Bone

Add Gating Capabilities

Easily convert the QUASAR™ Multi-Purpose Body Phantom into an IGRT Gating Phantom by adding the programmable QUASAR™ Respiratory Motion Assembly, thereby offering a cost-effective way to increase overall testing capabilities.

Specifications

• Drive unit; 20 cm long, 15 cm wide, 12 cm high, 5 kg, acrylic in the field of view
• Respiratory Phantom mass; approximately 14 kg with Body Oval and all options

Motion QA Software

The QUASAR™ Respiratory Motion Assembly includes a software application that allows you to display, edit, and run respiratory waveforms.