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, 15 posters,
18 presentations and 3 technical white papers.
Measuring Photon Beam Energy Changes on an Elekta Versa HD using 5 methods
K.L. Yun, et al, Allegheny Health Network (USA)
The clinical physics group compared the sensitivity of the IQM System to beam energy changes against 4 other conventional methods.
They concluded that the IQM device was approximately twice as sensitive as the other chamber methods.
Comparison of IQM and SRS MapCheck for pre-treatment SRS/SRT QA
Y. Liang, et al, Allegheny Health Network (USA)
The clinical physics group compared Sun Nuclear SRS MapCheck and IQM for the patient-specific QA of three single ISO multi-met SRS plans created with the Brainlab Elements MME TPS.
They concluded that both systems showed good agreement between the QA results, but that the QA time was dramatically reduced with IQM by approximately a factor of 10.
Comparison of pre-treatment VMAT QA between IQM and Varian Portal Dosimetry
Melissa Ghafarian, et al, Vanderbilt University Medical Center, Nashville, USA
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.
Combined use of IQM and an EPID-Based In Vivo Dose Monitoring System
Cinzia Talamonti, et al, University of Florence (Italy)
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.
Error detection capability of a novel transmission detector: a validation study for online VMAT monitoring
The purpose of this study by Pasler, Marazzo, et al was to characterize a new single large-area ionization chamber for online and real-time beam monitoring.
Effect of the IQM on 4-, 6-, 10-MV and 6FFF photon beams
Trang Hong Thi Nguyen, et al, Kanazawa University (Japan)
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
Adam Harpley, et al, Vanderbilt University Medical Center, Nashville (USA)
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
Haruna Yokoyama, et al, Kanazawa University (Japan)
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
Stephen Martinez, et al, Vanderbilt University Medical Center, Nashville (USA)
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..
External beams patient dose verification based on the IQM output signals
Courage Mahuvava, et al, University of the Free State, Bloemfontein (South Africa)
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.
One year clinical experience with the IQM
Marlies Pasler, Lake Constance Radiation Oncology, Singen-Friedrichshafen (Germany)
Download the full presentation summarizing the first year’s clinical experience of using IQM for online QA during every single treatment fraction.. This presentation was given by Marlies Pasler, PhD at the ASTRO 2019 Annual Meeting in Chicago, IL
Machine QA with IQM
Luis Fong de los Santos, Rochester (USA)
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
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