By Christina Ruiz,
February 26, 2018

Safe implementation of SRS/SBRT programs requires an understanding of basic physics and applications of a wide-array of clinical tools:  detectors, phantoms, treatment planning systems, and protocols.  A significant challenge lies in the measurement of non-standard small fields associated with SRS/SBRT as many sources of error can confound such measurements, including, improper detector choice, wrong setup, scanner misalignment, etc.  This challenge is made greater as new treatment planning and delivery techniques are introduced clinically often in a multi-vendor environment, where proper guidance may be lacking.  

The goals of this webinar are to

Provide a comparative evaluation of small-field detectors commonly used in SRS/SBRT commissioning. Review important steps necessary for accurate beam data acquisition, data processing, data validation, and treatment plan commissioning.  Discuss common pitfalls in beam data acquisition and methods of troubleshooting. Discuss the importance of comprehensive ...

By Christina Ruiz,
February 16, 2018


Title: TPS Reference Dose Specification: Dose to Water vs. Dose to Muscle

Speaker: Vladimir Feygelman, Ph.D., Medical Physicist, Radiation Oncology Moffitt Cancer Center and Research Institute

Date/Time: Tuesday, February 27th at 5 PM EST


This Webinar provides a preview of the forthcoming Report of the AAPM working group on reference dose specification for dose calculations.  The Report provides guidance on the best practice of obtaining dose-to-muscle as the final product of treatment planning, while reference linac calibration is specified in water.

Dose-to-muscle (tissue)  is required by the cooperative groups. Until now, about 25% of the sites monitored by IROC Huston specify their absolute calibration in muscle, through application of the 0.99 multiplicative correction, regardless of the TPS used. The Report analyzes each commercial TPS and algorithm on a one-by-one basis and recommends when such correction ...

By Christina Ruiz,
January 19, 2018

You are invited to join us for a live Webinar hosted by WePassed.


Title: Linac based stereotactic radiosurgery for brain tumors

Speaker: Winston (Ning) Wen, PhD, MBA

Date/Time: Tuesday, February 20, 2018, at 5:00 pm EST




Stereotactic Radiosurgery (SRS) is an effective treatment for brain metastases and other intracranial tumors. Here we will describe clinical consideration, treatment planning strategy and quality assurance of modern, LINAC-based SRS for brain tumors. We will discuss different approaches to treat single or multiple brain metastases with single-isocenter and the impact of target size modeling on the dose calculation accuracy. We will also review detectors used for small field measurement and how to establish a reference film dosimetry protocol for SRS patient specific QA.



Winston (Ning) Wen, PhD, MBA ...

By Christina Ruiz,
January 15, 2018

WePassed is offering another free webinar this month! Be sure to register and join us for the live event. 

Title: Kilovoltage Cone-beam CT for Radiation Therapy

Speaker: Xue Dong, Ph.D

Date/Time: January 29th, 2018 at 5:00 pm EST


X-ray kilovoltage (kV) cone-beam CT (CBCT) imaging is being increasingly used in various clinical applications, mainly for its large volume coverage and hardware compatibility with open-gantry x-ray imaging system. The use of CBCT improves patient setup accuracy and also opens possibilities of CBCT-based accurate tumor delineation and therapeutic dose calculation. This webinar will cover basics of cone-beam CT physics, the applications of CBCT in image-guided radiotherapy, adaptive planning and dose calculation. A brief overview of artifact corrections in CBCT will also be presented.



Xue Dong is a ...

By Christina Ruiz,
December 18, 2017

Title: The Basic Physics of MRI

Speaker: Geoffrey D. Clarke, PhD.

Date/Time: Thursday, January 11th, 2018 at 5:00 pm EST



This presentation will cover the basics of NMR physics and MR image formation with special emphasis on those methods important for application in Radiation Oncology.

Topics covered include: source of the MRI signal, definition of MRI relaxation times, MRI Hardware, MR image reconstruction and Basic MRI Pulse Sequences.



Geoffrey D. Clarke, PhD., FACR, FAAPM, is Professor of Radiology at the University of Texas Health Science Center in San Antonio. He is also the Director of the Graduate Program in Radiological Science and the Chief of the MRI Division for the Research Imaging Institute at UTSHCSA. Dr. Clarke is co-author of Bushong’s “Magnetic Resonance Imaging: Physical and Biological Principles, 4th ...

By Christina Ruiz,
November 21, 2017

Title: MR-guidance in Radiation Therapy

Speaker: Kathryn Mittauer, Ph.D., Staff Medical Physicist at University of Wisconsin-Madison

Date/Time: Wednesday, January 17th, 2018, at 5 PM EST


With the advent of MR-integrated radiation therapy systems, there has been a significant advancement in the localization and delivery of radiation therapy. This webinar will present clinical and quality assurance aspects of an MR-guided radiotherapy (MRgRT) program.  An overview of current MRgRT systems, clinical workflow, and MR-imaging capabilities will be discussed. Unique features of an MRgRT program including considerations of online adaptive radiotherapy, MR-based planning, and clinical cases will be highlighted.

Topics to be covered in this MR-guided radiotherapy (MRgRT) webinar:

MRgRT systems Workflow ...

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