Publications

The IQM System has been thoroughly evaluated by some of the world's leading radiation therapy centers.
Select your topic of interest from 14 articles, 14 posters,
16 presentations and 3 technical white papers.

JACMP Ghafarian

Comparison of pre-treatment VMAT QA between IQM and Varian Portal Dosimetry

Author:
Melissa Ghafarian, et al, Vanderbilt University Medical Center, Nashville, USA

Summary:
The purpose of this study was to compare pre-treatment VMAT QA measurements and evaluate the MLC error sensitivity of two detectors: the IQM System and the Varian Portal Dosimetry System.

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.

Kanazawa article

Effect of the IQM on 4-, 6-, 10-MV and 6FFF photon beams

Author:
Trang Hong Thi Nguyen, et al, Kanazawa University (Japan)

Summary:
Assessment of surface dose, PDD20,10 , TPR20,10 , PDD curves, inline and crossline profiles, transmission factor, and output factor with and without the IQM detector in order to investigate the effect of the IQM detector on 4, 6, 10, and 6-MV flattening filter-free (FFF) photon beams.

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..

UFS - External Beam patient dose verification

External beams patient dose verification based on the IQM output signals

Author:
Courage Mahuvava, et al, University of the Free State, Bloemfontein (South Africa)

Summary:
The purpose of this study was to make use of IQM field output signals to calculate the MUs delivered through an arbitrary treatment field in order to convert Monte Carlo-generated dose distributions in a patient model into absolute dose.

Machine QA with IQM

Author:
Luis Fong de los Santos, Rochester (USA)

Summary:
Download the full presentation with the preliminary results of a multi-center workgroup to implement TG-142 Machine QA with IQM. This presentation was given by Luis Fong de los Santos, PhD  at the ASTRO 2019 Annual Meeting in Chicago, IL

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)

White Paper: Matching with IQM – The GenesisCare experience

Author:
Kilian Michel, et al, iRT Systems, Koblenz (Germany)

Summary:
Four (4) Elekta Versa HD Linear accelerators at different sites within a network of 16 cancer centers were matched for the 6MV beam energy. As part of commissioning IQM detectors at each of the 16 sites we investigated the agreement of IQM and waterphantom measurements among the four matched machines and implemented a universal beam model to calculate predicted IQM measurements for them.

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.

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