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On-site implementation of IMRT for the Varian solution: a total package
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1. Modeling of TPS for IMRT(Eclipse)

We offer a total package for the modeling and acceptance of the IMRT part of the Eclipse system: kernel optimisation, dynamic leaf motion calculator configuration, MLC parameter derivation. The implementation is performed on-site by specialists. No specific local equipment is mandatory. 7Sigma relies on its own 2D ion chamber array (PTW 729array) for the measurements required for TPS configuration for IMRT. A report on the acceptance tests and the obtained dose calculation accuracy will be generated and discussed with the responsible physicist(s)/radiation oncologist(s).

 

2. Implementation of QA protocol for dynamic MLC

A protocol for quality assurance of the dynamic MLC is proposed and discussed with the local physicists. The protocol that has been decided upon is implemented; all necessary test files are delivered (or created).
 

3. Training of local medical physicists/dosimetrists and radiation oncologists

The performed acceptance tests, the basic characteristics of the optimization model, the leaf motion calculator and the forward dose calculation are discussed. A short, clinically oriented, practical training of the IMRT tools is given; benefits and shortcomings are discussed. This compact training does not pretend to cover the extensive information transfer provided by the Varian IMRT School, but focuses on the most practical aspects of the use of imrt in the clinical routine.

 

4. Implementation of TPS verification protocol in a phantom

For phantom measurements, simple solid water plates are most suitable. Provided all components for stable film dosimetry (film developer and film scanner) are available, 7Sigma assists in the implementation of a protocol for IMRT dose verification in a phantom by means of absolute film dosimetry. 7Sigma can provide the software tools for data analysis. However, since stable film developers are becoming rare and film dosimetry remains time consuming and error prone, we recommend the use of a 2D ion chamber array for reliable on-line 2D absolute dosimetry. If such an array is available, 7Sigma can implement the protocol for its usage with respect to IMRT.

 

5. Pre-treatment verification with absolute portal imaging dosimetry

Provided a license to the Portal Dosimetry software in Eclipse has been purchased from Varian Medical Systems, we offer the on-site implementation into clinical routine. This includes calibration of the portal imager (aS500) in the dosimetric acquisition modes and beam profile correction, measurement and configuration of the basic beam data and portal imager characteristics required for the portal dose prediction algorithm. A report on the obtained accuracy for quality assurance will be generated and presented to the responsible physicist(s)/radiation oncologist(s).

 

6. First IMRT patient treatment

As a final step in the implementation, we assist in the planning, QA and treatment initiation of the first IMRT patient(s).

The time required to complete implementation typically varies between one and four weeks, depending on the number of accelerators and treatment energies to be used for IMRT, the availability of on site equipment and the ease of access to the treatment machine and planning system.


The total cost for the PureMorning package covers our travel and accommodation expenses and a daily fee. The price is fixed beforehand, based on an estimate of the number of days. For more information, feel free to contact us.
 
Portal dosimetry LIC (PDF)  : Radiotherapy and Oncology 60 (2001) 181-190   © Elsevier Science Ireland Ltd.
 IMRT implementation (PDF)  : Radiotherapy and Oncology 65 (2002) 53-70   © Elsevier Science Ireland Ltd.
Portal dosimetry aS500 (PDF)  : Radiotherapy and Oncology 71 (2004) 223-234   © Elsevier Science Ireland Ltd.

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