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New AAPM TG-132 report on radiotherapy image registration recommends use of virtual phantom software testing technology

Posted on Jul 19, 2017

ImSimQA from Oncology Systems Limited highlighted in report for testing, validating and commissioning modern image fusion and registration software

A new report from the American Association of Physicists in Medicine (AAPM), Task Group 132, on the use of image registration and fusion techniques in radiotherapy planning has cited the use of ImSimQA™ from Oncology Systems Limited. Emphasising the need for clinic-specific testing, the report makes use of image datasets as provided by ImSimQA virtual phantom and QA software, as a vital starting point for quality assurance (QA), validation and commissioning. The technology extends the quality and range of testing for clinical deformable and rigid image registration algorithms commonly used with radiation therapy and medical imaging systems.

TG-132 makes recommendations on tests and tolerances for digital phantom test cases, based on the clinical experience of its task group and published validation studies. ImSimQA contains all the quantitative analysis tools recommended by TG-132, including recommendations around contour analysis, landmark analysis, image comparison, jacobian determinant and more. It also includes a cost-effective toolkit of 15 pre-defined digital phantoms while also enabling users to create personalised test phantoms using their own clinical data. The technology makes testing simpler, removing the need for physical deformable phantoms, which are often complex, time-consuming and expensive to build.

With clinical variables such as patient anatomy and positioning, image quality and imaging devices subject to change, ImSimQA offers extensive and flexible testing for a variety of deformable and rigid image registration scenarios. As well as increasing the accuracy of testing, it reduces the time needed to acquire test images on high-demand CT, MR and PET scanners plus 4D and IGRT imaging systems. ImSimQA is the only commercially available QA package for image fusion and deformable image registration and it is currently the system of choice for over 60 hospitals worldwide.

Jason Pukala, PhD, Physicist UF Health Cancer Center at Orlando Health states, “ImSimQA is a very useful tool for the commissioning and QA of deformable image registration algorithms. As DIR algorithms become more commonplace in clinics, it is imperative that clinicians understand the mechanisms and limitations of these algorithms. ImSimQA allows users to create their own deformations where the underlying deformation map is user-defined and known for every point in the image set. This allows physicists to perform more extensive testing than landmark analysis would permit.”

“It’s vital for clinicians to have confidence in their image registration software. Once systems have been tested and fully understood, it instils a natural confidence in dealing with patient data,” states Susan Barley, Lead Clinical Scientist at Oncology Systems Limited. “It’s great to see the software recognised by TG-132 for its strong credentials in image registration QA. ImSimQA has many uses and we are pleased to celebrate 10 years of working closely with medical physicists to ensure it supports their needs; from QA, to clinical trials and tailored applications such as comparing and standardising contouring in CT and MR.”

AAPM speakers ImSimQA edited 400px

Speakers on Deformable Image Registration at AAPM and using ImSimQA: Jason Pukala, Physicist, UF Health Cancer Center at Orlando Health; Kristy Brock, Chair of AAPM TG-132 Committee; and Dean Willems, Commercial Director of OSL, manufacturer of ImSimQA.



For further information on OSL’s ImSimQA please visit http://www.imsimqa.com or call us on +44 (0)1743 462694


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