Publications

Implementation of a Transmission Chamber (IQM) as a Dosimetric System for Verification of Radiotherapy Treatments (English translation)

Authors:
A. Gómez Barrado, A. Sánchez Jiménez. GenesisCare La Milagrosa, Spain

Summary:
A study from GenesisCare La Milagrosa (Madrid), presented at SEFM 2025, evaluated the IQM system across 18 linear accelerators and 106 SRS/SBRT treatments. The results confirmed that IQM is reliable, reproducible, and easy to integrate into clinical practice, even for complex techniques.

Implantacion de Camara de transmission (IQM) como sistema dosimetrico de verificacion de tratamientos de radioterapia (Spanish)

Autores:
A. Gómez Barrado, A. Sánchez Jiménez. GenesisCare La Milagrosa, Spain

Resumen:
Un estudio de GenesisCare La Milagrosa (Madrid), presentado en el SEFM 2025, evaluó el sistema IQM en 18 aceleradores y 106 tratamientos de SRS/SBRT. Los resultados confirmaron que IQM es fiable, reproducible y fácil de integrar en la práctica clínica, incluso en técnicas complejas.

A Comparison of Segment-by-Segment Versus Cumulative Signal Evaluation for Patient-Specific QA using the IQM

Author:
Farideh Pak, PhD, et al, Cedars Sinai Medical Center, Los Angeles, CA, USA

Summary:
This study from Cedars Sinai Medical Center evaluates the IQM system for patient-specific QA across 37 VMAT treatment plans covering brain, spine, lung, and prostate sites. The authors compare segment-by-segment and cumulative signal analysis, demonstrating that segment-level evaluation improves the detection of localized delivery errors. With a mean segment-level difference of 2.0% and cumulative difference of 1.04%, the findings confirm the precision and reliability of IQM measurements and highlight the clinical value of high-resolution QA in modern radiotherapy.

Using IQM for Plan Verification and to Monitor Linac Performance

Author:
Pavord, D., Allegheny Health Network, Pittsburgh, PA, USA

Summary:
Dan Pavord from AHN showcases how IQM is used for both patient-specific QA and daily LINAC performance checks, improving error detection and reducing QA time. He also highlights its potential role in future adaptive radiotherapy workflows.

Beyond Conventional QA: IQM Real-time Monitoring for Every Patient

Author:
Kumagai, S., Teikyo University Hospital, Tokyo, Japan

Summary:
Shinobu Kumagai from Teikyo University Hospital presents the clinical integration of the IQM System for real-time beam monitoring in radiotherapy. The talk highlights its application in VMAT-TBI, Online-ART, and daily treatments, demonstrating how IQM enhances safety, accuracy, and workflow efficiency across a wide range of clinical cases.

Experience of IQM at Southampton for SRS cases

Author:
Chandrasekaran, M., et al, University Hospital Southampton, United Kingdom

Summary:
Mekala Chandrasekaran from University Hospital Southampton presented their successful implementation of IQM for single-isocentre SRS treatments of multiple brain metastases. By extending beam modeling to sub-centimeter fields, the team achieved segment-by-segment accuracy within 3%, confirming IQM’s precision and reliability for complex stereotactic QA.

Experience of IQM at Southampton for CNS and SRS cases

Author:
Smith, L., et al, University Hospital Southampton, United Kingdom

Summary:
Laura Smith from University Clinic Southampton presents their experience using IQM for CNS and SRS treatments. By replacing Delta4 with IQM, her team reduced verification time from 3 hours to under 30 minutes per case. The presentation highlights IQM’s efficiency, automation, and suitability for complex, multi-isocentre plans—making it a powerful tool for streamlining QA and improving clinical workflow.

IQM verification for breast VMAT treatments

Author:
Duwaerts, R., et al, AZ Turnhout, Belgium

Summary:
Ruben Duwaerts from AZ Turnhout presents their clinical experience using IQM for breast VMAT verification. He highlights the system’s seamless integration, time-saving automated workflows, and its effectiveness across various fractionation regimens and treatment techniques.

Enhancing quality assurance in hybrid DCAT plans: The impact of reduced maximum dose rate

Author:
Kollotzek, S., et al, Universitätsklinik für Strahlentherapie-Radioonkologie, Medizinische Universität Innsbruck, Austria

Summary:
The goal of this project is to evaluate the accuracy of dose delivery for hybrid DCAT plans under different conditions, with a focus on how adjusting the linac’s maximum dose rate impacts the alignment between planned and delivered doses.

Implementation of a gantry mounted ion chamber for the machine QA and clinical routine

Author:
R. Nachtigall, et al, Strahlenzentrum Hamburg MVZ, Germany

Summary:
The purpose of this project is to evaluate if the IQM is a reliable alternative to the phantom based patient plan verification offering the possibility to shift the QA to the first treatment fraction.

Longitudinal Evaluation of the IQM for Routine Clinical Quality Assurance of Photon Beams

Author:
O. Grahm Valadie1, et al, Cedars-Sinai Medical Center, Los Angeles, CA

Summary:
The purpose of this project is to compare the QA capabilities of the IQM to clinically established QA devices and to shows its potential to efficiently replace current QA devices, while minimizing setup error for daily and monthly QA.

Using the IQM Transmission Detector to Monitor Linac Performance

Author:
Dan Pavord, Allegheny Health Network, Pittsburgh, PA

Summary:
Dan Pavord, Chief of Medical Physics at Allegheny Health Network in Pittsburgh, presented groundbreaking findings on the use of the Integral Quality Monitor (IQM) for comprehensive machine quality assurance (QA).