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 IMRT Dose Verify Phantom
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IMRT Quality Assurance System

 

IMRT Phantom for CT Imaging and Treatment Planning, SeeDOS Code 91230

The commercial availability of IMRT has presented the medical physicist 

with a new treatment modality to manage and requires a new set of 

specific instruments. SeeDOS provided Exradin ion chambers are

ideally suited for IMRT measurements. SeeDOS also provides a 

selection of phantoms for IMRT applications.

 

Gain confidence in the accuracy of your treatment plan and improve patient outcome by 3D evaluation of:

 

  • High and low dose gradient areas
  • Dose distributions to sensitive regions
  • Inhomogeneity structures
     

New (March 2004) EXRADIN Ionization Chambers pdf brochure

New (March 2004) ACE (Axial, Coronal, Edge ) PHANTOM pdf brochure

New (March 2004) IMRT Dose Verification PHANTOM pdf brochure

New (March 2004) QUASAR Body and Beam Geometry PHANTOM pdf brochure : QUASAR ( Quality Assurance System for Advanced Radiotherapy )

Download our detailed PDF for more information on the IMRT Phantom                  

Download our PDF explaining examples of IMRT Phantom Usage

Download our PDF explaining IMRT Dose Calculation

Download our detailed PDF showing features, typical procedure and frequently asked questions and answers

For a pictorial listing of available Cable Connectors, please click here

Go To New IMRT phantom Comparison-Questions and Answers

Go To IMRT Instrument Selection Worksheet

For Technical Information on the construction and use of the phantoms, please click here

NEW (Dec 2002) Exradin CT Ion Chamber -new brochure (Designed for use with phantoms having the typical 13.1mm cavity) (PDF)

NEW (End of January 2003) New Virtual Water IMRT Phantom pdf brochure

 

Absolute Dose   Point Dose
  • Make absolute measurements of does at various depths in up to 16 positions throughout the phantom with standard thimble ion chambers.
 
  • Make point does measurements in any position in the phantom using MOSFET diodes or TLDs, allowing verification of the treatment plan for sensitive structures.
Relative Dose   Simultaneous Measurement
  • Make relative dose (fluence dose) measurements using ready pack or radiochromic film placed every 3 cm.
  • Easily compare film to TPS in 3D using four reference market points. Reference marker points facilitate orientation of film, digital reconstruction, and transfer of multiple coronal film views to 3D sagital and transverse images.
     
 
  • Make all three dose measurements simultaneously with one set up and treatment, saving you time.
  • Coronal film placement allows simultaneous ion chamber and film use since the planes are parallel.
     
Fast Set Up   Anthropomorphic Shape
  • Unique, versatile design allows many configurations to simulate individual treatment plans.
  • Quick, intuitive set-up. Complete a prostate set up and verification in as little as 15 minutes.
  • Easily configure and adjust layered phantom slabs for individual 3D patient simulation.
  • Fine 1 mm scribed black lines for easy laser alignment positioning of phantom.
 
  • Anthropomorphic design provides intuitive, easy set-up for fast confirmation of the treatment plan.
  • Bone and lung insert fields provide high gradient tissue interfaces to evaluate TPS's ability to manage these interfaces. Uncovers "edge effect" issue related to issues related to tissue heterogeneity.
  • Accuracy of the prescribed dose is evaluated and confirmed in simulated patient conditions in the body, except extremities.
  • Effectively evaluates junctioning issues of upper neck and half beam block superclav fields.
     
Bone Equivalent Plug   Transparent Acrylic Construction
  • Simulates bone for realistic TPS evaluation. Measure the absolute dose at isocenter near the spine.
     
 
  • Operator can visualize the placement of film, chambers and diodes for accurate measurements, thus minimizing registration errors.
  • Acrylic is characterized for all the energies in TG-21, whereas other water-equivalent materials may only be characterized for cobalt. For IMRT, exacting measurements are essential when dealing with small field sizes.
  • or absolute dosimetry, apply correction factors for acrylic to water which are published in the TG-21 protocol. Standard Imaging combines the required corrections into one table based on depth and energy, allowing the application of only one factor.
     

 SPECIFICATIONS

IMRT DOSE VERIFICATION PHANTOM, SeeDOS Code Number 91230

SeeDOS Code Number 91230 includes:

2 Chamber Phantom Slabs, with 6 cavities each for ion chamber placement

2 Acrylic Phantom Slabs, for build up thickness

2 Lung Phantom Slabs, with cavities for simulated lung inserts

16 Solid Acrylic Plugs, to fill unused ion chamber cavities

1 Solid Acrylic Plug, with cavity drilled for the ion chamber of your choice

1 Bone Equivalent Plug

1 Lung Equivalent Set, with 4 inserts for lung phantom voids

 

A typical set of products for IMRT Quality Assurance also includes the following:

 

IMRT Dosimetry

 

SeeDOS Code            Description

92711                          Exradin A14 Microchamber, 0.009cc

80031                          ADCL Therapy Calibration, Co point in Water

90015                          MAX 4000 Electrometer

80015-4                       Electrometer Calibration Four Scales, for MAX 4000

 

Options                          

 

SeeDOS Code            Description

70608                          TLD/Diode/Mosfet Phantom for P/N 91230

50062                          Additional Acrylic Phantom Slab for large volume patients

RIT113                         RIT113 Film Dosimetry Software, includes adaptec SCSI Interface

                                   card with EZ-SCSI Software, Vidar VXR-16 Dosimetry Pro X-Ray

                                   Film Digitizer and shipping and handling

 

TG-53 IMRT Non-Dosimetric Quality Assurance

 

SeeDOS Code            Description                                   

QBGP                         Quasar Beam Geometry Phantom

QBDP                         Quasar Body Phantom

 

Additional Items Needed

Kodak XV verification film, Kodak TL therapy localisation film, Automatic film processor, light box, box end and crescent wrenches, styrofoam blocks, calibrated digital level, film cassette, tld chips.    

 

PHANTOM OVERVIEW

Chamber Phantom Slab has six cavities for thimble ion chamber measurement. The diameter of each cavity is ¾". Solid acrylic plugs are included to fill the cavities for simulated patient thickness. One solid acrylic plug is drilled for the ion chamber of choice. A bone equivalent plug is included for precise simulation of high dose gradients.

Acrylic Phantom Slab is a solid acrylic slab to provide simulated patient build-up material. Four 2 mm steel balls are imbedded in the slab as reference markers for 3D orientation of film on TPS.

Lung Phantom Slab is an acrylic slab with two cavities for simulated lung inserts, two cylindrical cavities for

thimble ion chamber placement and a set of two cedar lung inserts for lung simulation.

Dimensions:

Height (6 slabs) Width (each slab) Length (each slab) Weight (6 slabs) Cavity Diameter

18.00 cm (7.09 in) 30.00 cm (11.81 in) 45.00 cm ( 17.72 in) 22.7 kg (50.0 lbs) 1.90cm (3/4")

 

ADDITIONAL OPTIONS

MOSFET Diode/TLD Slab, SeeDOS Code No 70608, has 9 channels for MOSFET diodes or TLD chips, which can be placed at any point in a field for point dose measurements. The small channel size was designed not to adversely affect other measurements so this slab can also be used as a solid slab for increased patient thickness. MOSFET diodes are isotropic for dose measurements from any angle.

Acrylic Phantom Slab, SeeDOS Code No 50062, is a solid slab to provide simulated patient build-up material. Four 2 mm steel balls are provided for use as reference markers for 3D orientation of film on TPS.

Carrying Case, SeeDOS Code No 50064, has extendable handles and wheels for transport from room to room. Case also protects phantom during shipping.

 

Specifications are subject to change without notice.

 

Full Information on the use of this phantom for Dose Verification is available, please click here on the detailed pdf information sheet

A summary of the steps involved is as follows:

Dose Verification

A. Create treatment plan based on patient scans.

B. Configure the IMRT Phantom on the CT couch according to the anatomy to be

treated.

C. CT scan the phantom with the selected chamber in place.

D. Import CT phantom scans into the treatment planning system.

E. Transpose treatment plan onto CT phantom scans

F. Place the phantom, with ion chamber, film, and diodes in place, on the accelerator

treatment couch.

G. Treat the phantom as the treatment plan indicates.

H. Examine the output of the ion chamber (absolute dose), film (relative or fluence

dose), MOSFET diodes (point dose) and compare them to the treatment plan.

 

Illustrations available, please click here on the detailed pdf information sheet, include the following:

 

Step A Coronal view of a patient scan from treatment planning computer that will be

transposed onto the phantom scan.

Step B Phantom positioned on the simulator couch ready to be scanned.

Step C Scan the phantom.

Step D Three view scan of the phantom in the treatment planning example.

Step E The three view treatment plan is transposed onto the phantom scan.

Step F Phantom on accelerator treatment couch ready for treatment.

Step G Treat the phantom as if it was a patient.

Step H Examine the output of the ion chamber. This table shows typical dose

measurements from an ion chamber. In a similar manner point dose

measurements from MOSFET diodes can be tabulated and examined.

 

Field     Charge Total         Charge Per Field

1                 1.78                             1.78

2                 3.54                             1.76

3                 5.88                             2.34

4                 7.91                             2.03

5                 9.23                             1.32

 

Examine the fluence dose Image of a film placed between acrylic slabs of the IMRT phantom

 

Step H Analysis of a vertical fluence dose profile of the measured film versus the calculated dose on the RTP.

Step I Analysis of a horizontal fluence dose profile of the fluence dose profile of the measured film versus the  calculated dose on the RTP.

EXRADIN Ion Chambers for IMRT

 

Model 14 or 14SL Microchamber

Model 1 or 1SL Thimble Chamber

 

 

 

Collecting Volume

0.009 cc

0.05 cc

 

 

Outside Diamter of Collecting Shell

6 mm

6 mm

 

 

Projected Collecting Area

6 mm by 4 mm

6 mm by 8 mm

 

 

Centroid of Collecting Volume, mm from Tip of Chamber

2.0 mm

4.0 mm

 

 

Nominal Calibration

365 R/nC

60 R/NC

 

 

nC per 100 MU

0.32

1.57

 

 

Materials Available

Model 14 A or T

Model 14SL A only

Model 1 A, T, or M

Model 1SL A only

 

 

A = Air Equivalent C552

 

T = Tissue Equivalent A150

 

 

M = Pure Magnesium

 

 

 

 

1. 10 x 10 field; 2.5 depth solid water phantom; 100 cm SSD; 6 Mv photons

 

For a pictorial listing of available Cable Connectors, please click here

 

If you are interested in any of the products mentioned here, please complete a Quotation Request Form  or an

Enquiry Form so that we may promptly respond to your detailed request.

 

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Please contact Colin Walters at cwalters@seedos.com if you would like further  information or you have questions

or comments about this web site.
SeeDOS Ltd, 26, The Maltings, Leighton Buzzard, Bedfordshire LU7 4BS, United Kingdom
Tel: +44 1525 850 670  • Fax: +44 1525 850 685