Sponsored by Varian, A Siemens Healthineers Company

Presented by Ryan Clark, MS, CMD, RT(T)
Varian, A Siemens Healthineers Company

Live Session:
Wednesday, August 20, 2025
1:00 - 2:00 PM Eastern Time

The recorded session will be available within 24 hours of the live session. The recorded session needs to be completed by Wednesday, September 17, 2025, to earn CE credits.

This presentation will provide an in-depth exploration of RapidArc Dynamic (RAD), a radiation therapy technique that integrates dynamic gantry positions, supports pausing gantry rotation, and dynamically rotates the collimator in treatment arcs with contiguous MLC apertures. Participants will learn about the technical foundations of RAD, including its GPU-based optimization engine, and how it differs from traditional VMAT approaches. The session will include detailed case studies across diverse treatment sites, demonstrating how RAD can improve dosimetric quality while potentially reducing delivery time compared to current techniques. The presentation will highlight practical strategies and techniques tailored for dosimetrists to implement in the clinic.

Learner Outcomes:

1. Discuss the key technical differences between RapidArc Dynamic and VMAT, including dynamic collimator rotation, static angle modulated ports, and optimization algorithm.
2. Selecting appropriate static gantry angle selection and weighting strategies for different treatment sites.
3. Evaluate the dosimetric advantages of RAD across various clinical scenarios using plan quality metrics.

Educational Level: Intermediate

Presenter:
Ryan Clark, MS, CMD, RT(T), is a certified medical dosimetrist that works as a research scientist within the Varian’s medical affairs team. He completed his Master of Science degree in medical dosimetry at the University of Wisconsin - La Crosse in 2016. Before joining Varian in 2021, Ryan worked as a clinical medical dosimetrist in both academic and community settings. Ryan is passionate in assisting clinicians involved with treatment planning to leverage the technology available to help ensure that high quality plans can be achieved for all patients.

This activity is part of the celebration of National Medical Dosimetrist's Day and is free to AAMD members and non-members. Once you have logged in, it will display as FREE and will not count against the annual CE credit allowance for Members

ARRT CQR Credit Distribution
Radiation Therapy 2017:
Procedures    
Prescription and Dose Calculation = 0.50
Treatments = 0.50

Radiation Therapy 2022       
Procedures    
Prescription and Dose Calculation = 0.50
Treatments = 0.50