Publications

The IQM System has been thoroughly evaluated by some of the world's leading radiation therapy centers.
Select your topic of interest from 12 articles, 11 posters,
19 presentations and 3 technical white papers.

Talamonti - Combined use of IQM and Portal Dosimetry

Combined use of IQM and an EPID-Based In Vivo Dose Monitoring System

Author:
Cinzia Talamonti, et al, University of Florence (Italy)

Summary:
Evaluation of the combined use of the IQM system and SoftDiso portal dosimetry software, for in vivo dose monitoring by simultaneous detection of delivery and patient setup errors in whole breast irradiation. The combined use of the IQM and SoftDiso allows for fast identification of both delivery and setup errors and substantially reduces the impact of error identification and correction on the treatment workflow.

Evaluation of the signal response with the EPID and the IQM for SBRT QA

Author:
Adam Harpley, et al, Vanderbilt University Medical Center, Nashville (USA)

Summary:
The clinical physics group introduced a variety of clinically significant treatment delivery errors into 8 retrospective SBRT plans and compared the error sensitivity of IQM to their Varian Portal Dosimetry system.

Evaluation of the IQM for 4MV x-ray beam

Author:
Haruna Yokoyama, et al, Kanazawa University (Japan)

Summary:
The clinical physics group introduced a variety of clinically significant treatment delivery errors into 6 different treatment techniques (3x 3DCRT, 1x IMRT and 2x VMAT) all utilizing 4MV treatment beams.
They concluded that IQM was more sensitive to the MLC errors than the conventional QA method. IQM was also able to detect the systematic open/close leaf position and leaf shift errors in all the modified plans. They stated that IQM was even able to detect single leaf shifts within an otherwise correct field size and shape.

Optimization of DLG and MLC transmission factors

Author:
Stephen Martinez, et al, Vanderbilt University Medical Center, Nashville (USA)

Summary:

The clinical physics group aimed to compare the capability of the iQM system for optimizing MLC model specific parameters: Dynamic Leaf Gap and Transmission Factor to a IBA MatriXX spatial array. IQM shows a VERY small variation in the measured results and is able to clearly determine the best match of the minimum percent absolute error between predicted and measured signal. Download the poster to learn that IQM facilitated a higher resolution (0.01 mm) measurement than was possible with MatriXX..

Plan QA with IQM (German)

Author:
Sonja Wegener, et al, Unversity Clinic Wurzburg (Germany)

Summary:
Clinical experience using IQM for VMAT Plan QA.

UFS - Sensitivity analysis of two commerical

Sensitivity evaluation of two QA system to organ-dose variation of VMAT plans

Author:
Oluwaseyi M. Oderinde, et al, University of the Free State, Bloemfontein (South Africa)

Summary:
Assess the dose variation sensitivity of two quality assurance (QA) devices (IQM and MatriXXEvolution)

Wuerzburg - Sensitivity of the IQM (2)

Sensitivity of the IQM to errors of VMAT plans

Author:
Gary Razinskas, et al, Unversity Clinic Wurzburg (Germany)

Summary:
This article verifies the accuracy of the signal prediction for the Synergy Agility MLC. Tolerance criteria for VMAT plan verification with the IQM were obtained from the observed sensitivity for the detection of incorrectly delivered plans. This study used 60 VMAT plans to compare the measured and the calculated signal.

Saito - Comparison of MLC error

Comparison of MLC error sensitivity of various QA systems for VMAT Plan QA

Author:
Masahide Saito, et al, University of Yamanachi (Japan)

Summary:
This article compares the MLC error sensitivity of various measurement devices for VMAT pre‐treatment quality assurance (QA).

Marrazzo - Real-time beam monitoring

Real-time beam monitoring for error detection in IMRT plans and impact on DVH

Author:
Livia Marrazzo, et al, Multi-centre study of 3 RT departments

Summary:
This article shows the ability of detecting small delivery errors with a transmission detector for online monitoring of Intensity Modulated Radiation Therapy (IMRT) treatments. The authors also show how the IQM signal deviations strongly correlate with changes in the dose-volume-histogram for the PTV and OAR’s.

Pasler Marrazzo - Error detection capability

Error detection capability of IQM: an validation study for online VMAT monitoring

Author:
Marlies Pasler, Livia Marrazzo, et al, Lake Constance Radiation Oncology Center, Friedrichshafen (Germany) and University of Florence (Italy)

Summary:
Deviations in dose distributions between the original and error-induced plans were compared in terms of detector signal deviation, dose-volume histogram (DVH) metrics and 2D γ-evaluation.

Real-time verification of VMAT delivery

Author:
Makan Farrokhkish, et al, Princess Margaret Cancer Centre, Toronto (Canada)

Summary:
Evaluation of the IQM beam monitoring performance to assess the accuracy and reproducibility of the linac beam delivery. The signal calculation accuracy and measurement reproducibility as well as the error detection capability of the IQM System was evaluated. For this study the author analyzed 52800 beam segments.

Correlation of error detection sensitivities for two VMAT QA systems

Author:
Kilian Michel, Lake Constance Radiation Oncology Center, Singen-Friedrichshafen (Germany)

Summary:
Sensitivity of PTW Octavius, IBA Dolphin and IQM for various delivery errors

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