Motion-aware radiation therapy sharpens cancer care for dogs

A veterinary-human oncology collaboration is using dogs with naturally occurring cancers to refine motion aware radiation therapy, a technique designed to account for tumor movement during breathing. The work centers on respiratory gated cone beam CT, which captures anatomy across the breathing cycle so clinicians can see how a tumor shifts rather than relying on a single static image. Kim Selting at the Cancer Center at Illinois and Geoffrey Hugo at Washington University’s Siteman Cancer Center are leading the project, with support from the Siteman Investment Program Research Development Award and the Cancer Center at Illinois. (myvetcandy.com)

The clinical problem is familiar to radiation oncologists: precision drops when the target won’t stay still. Tumors in the chest, lungs, or nearby structures can move enough with respiration to complicate contouring, setup, and dose delivery. That can force clinicians to use larger treatment margins, which helps avoid missing tumor tissue but also increases radiation exposure to normal organs. Human oncology has addressed this with four-dimensional imaging and respiratory gating, but those tools have not always been practical or widely available in veterinary settings. (cancer.illinois.edu)

That context helps explain why this project matters. According to the Cancer Center at Illinois, Selting collects respiratory gated cone beam CT scans from canine patients during treatment, then Hugo’s lab applies motion-compensated reconstruction algorithms to reduce artifacts and background noise. The center said all 10 dogs in the initial cohort have now been scanned, and human-trained models were able to reconstruct the canine scans successfully. The team presented the findings at the 2025 AAPM annual meeting, where the work received a Blue-Ribbon Poster Award. (cancer.illinois.edu)

The idea builds on a longer trend in veterinary radiation oncology toward image guidance and adaptive treatment. A 2021 University of Wisconsin School of Veterinary Medicine update described its Radixact system as providing real-time tumor motion tracking, treatment synchronization, and on-treatment adaptation, with clinicians saying the platform allowed shorter treatments and more confidence sparing healthy tissue. Earlier veterinary literature has also documented routine use of onboard kV cone beam CT for setup verification in dogs receiving image-guided radiation therapy. Meanwhile, UW investigators have studied slow CT as a more accessible way to assess respiratory motion in dogs with pulmonary lesions when full four-dimensional CT is too costly. (vetmed.wisc.edu)

Expert commentary from the Illinois group frames the translational value clearly. Selting said dogs are a strong model because they develop spontaneous cancers, share human environments, and retain intact immune systems, making them useful for testing techniques under real clinical conditions. Timothy Fan, associate director for translational research and development at the Cancer Center at Illinois, said the project is foundational to building a cross-institutional hub that links engineering and clinical radiation practice. Those comments align with a broader comparative oncology model in which pet dogs help bridge preclinical research and eventual human applications. (cancer.illinois.edu)

Why it matters: For veterinary professionals, the significance is practical as much as scientific. Better motion characterization can support tighter target margins, more accurate positioning, and potentially lower dose to surrounding soft tissue, especially in thoracic and abdominal cases that have historically been difficult to treat aggressively. That could translate into fewer late adverse effects, better quality of life, and more confidence when discussing radiation plans with pet parents. It also points to a future in which advanced motion management is not limited to large academic centers, if reconstruction methods can make existing imaging systems more clinically useful. (cancer.illinois.edu)

There’s also a business and access angle. The Illinois team said grant support helped cover advanced CT imaging costs for participating patients, reducing the financial burden for pet parents while generating data that could improve planning quality. In a field where cost can shape whether a case proceeds to radiation at all, that matters. If motion-aware workflows eventually improve precision without requiring every hospital to buy the most expensive imaging stack, they could broaden access to higher-quality radiation care. That last point is an inference based on the project’s goals and the parallel UW work on lower-cost motion assessment, rather than a stated outcome. (cancer.illinois.edu)

What to watch: The next milestones are likely to be peer-reviewed publication, validation in a larger cohort, and evidence that motion-compensated reconstruction changes planning margins, toxicity, or local control in actual canine patients. Longer term, the key question is whether these veterinary cases will help accelerate similar workflows in human radiation oncology, while also making advanced motion management more feasible in everyday veterinary practice. (cancer.illinois.edu)