Modus Medical Devices Inc.

Quasar™ Multi-Purpose Body Phantom Adaptable Dosimetric and Nondosimetric QA

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. The Multi-Purpose Body Phantom can also be easily converted into a Respiratory Motion Phantom by adding the QUASAR Programmable Respiratory Motion Assembly, thereby offering a cost-effective way to increase overall testing capabilities.

Characterized by its adaptability to on-going advances in QA technology, the Multi-Purpose Body Phantom offers a broad range of applications for modern radiotherapy clinics:

Nondosimetric tests include:

Dosimetric measurement capabilities 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 simulators, RTPS and other imaging workstations
Image transfer, storage, retrieval, DICOM tools on all workstations

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
Convert any optional Respiratory Motion Insert to a stationary Multi-Purpose Body Phantom insert by using the MP Insert Adapter.

As technology evolves, so does the range of standard inserts for the 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
Also available: Optional spatial resolution and slice profile insert.

Spatial Resolution Insert