The CIRS IMRT phantoms are designed to address the complex issues surrounding commissioning and comparison of treatment planning systems and verification of individual patient plans and delivery.

All CIRS IMRT Phantoms:

• Approximate the human body in size, structure and tissue properties using known and fairly simple geometrics.

• Allow for verification of the most common treatments such as lung, head and neck, breast, and prostate.

• Accommodate the wide variety of dosimeters necessary to perform thorough verification of the IMRT process.

• Enable easy upgrades and custom configurations through a modular design system.

• Provide a cost effective, user friendly and better designed alternative to existing phantoms.

• Are constructed of propietary tissue equivalent epoxy materials. Linear attenuations of the simulated tissues are within 1% of actual attenuation for water and bone and within 3% for lung. These unique materials eliminate the need for correction factors, thus improving accuracy and saving time.

• Accommodate standard Ready Pack™ films in a transverse orinetation (other orientations available upon request.)

• Incorporate a unique interchangeable rod design that enables chambers, diodes, MOSFET’s and TLD’s to be positioned in the same locations within the phantom for inter comparison of detectors. Depending on the model selected, your phantom may allow measurements to be taken inside or adjacent to semi-anthropomorphic lung and bone structures.

• Enable acquisition through planning process to treatment delivery.

• Include CT to film fiducial markers allowing easy film registration supported by RIT 113.

• Include an alignment base and holding device that enables quick and easy set-up of multiple phantom sections while still allowing easy access and relocation of detectors.

Additional Features:
(optional in some models)
• Electron density reference plugs
• Radiochromic film stack for small volume distributions
• BANG™ gel cassette
• Carrying case

CIRS IMRT PHANTOMS
Complete QA from CT Imaging to Dose Verification

Ratios of CIRS IMRT Phantom Material (2)(3)
Linear attenuation coefficients to reference tissues


En, MeV

Plastic Water-
DT to H2O
Ratio, %

Average Bone
to Ref1
Ratio, %

Lung (inhale)
to Ref2
Ratio, %

0.05
0.06
0.08
0.10
0.15
0.20
0.40
0.60
0.80
1.00
1.50
2.00
4.00
6.00
8.00
10.0
15.0
20.0
El. density
Density

100.8
100.5
100.3
100.2
100.1
100.1
100.1
100.1
100.1
100.1
100.1
100.1
100.0
99.8
99.7
99.6
99.2
99.1
100.1
1.039 g/cm3

100.00
99.96
99.91
99.88
99.86
99.84
99.84
99.83
99.84
99.83
99.84
99.84
99.87
99.93
99.95
100.03
100.06
100.13
99.83
1.60 g/cm3

100.3
101.1
101.9
102.2
102.5
102.5
102.7
102.6
102.7
102.7
102.7
102.6
102.1
101.6
101.2
100.7
100.0
102.7
102.7
0.21 g/cm3

1. The CIRS line of IMRT phantoms is compatible with the RIT 113 Software for film to plan analysis.
2. ICRP 23, Report of the Task Group on Reference Man (1975).
3. Woodard, H.Q., White, D.R., The Composition of Body Tissues, The British Journal of Radiology (1986) 59; 1209-1219.

Radiation Products Design, Inc.         www.rpdinc.com           sales@rpdinc.com
 763-497-2071   Fax 763-497-2295   5218 Barthel Industrial Drive Albertville, MN 55301
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