Welcome to PTW at AAPM 2022!


Learn how our 2022 product highlights support your dosimetry needs.

July 10-14 • Washington, DC • Booth #5077

Join our Lunch & Learn Symposium

Walter E. Washington Convention Center in Meeting Room 146C, Level 1 on Tuesday, July 12th from 12:15pm – 1:45pm.


OCTAVIUS and RUBY, the dream team for stereotactic treatment QA
Ann Van Esch, Ph.D., 7Sigma Radiotherapy Physics, Belgium


Patient-specific QA for CK deliver-ray
George Cernica, Ph.D., Aspekt Solutions, Virginia Hospital Center, Virginia


Efficacy of BEAMSCAN MR Application for MR Linac
Poonam Yadav, Ph.D., Northwestern University Feinberg School of Medicine, Illinois


Commissioning Dosimetric Aspect of MRIdian with PTW – VCU Experience
William Y. Song, Ph.D., Virginia Commonwealth University, Virginia


Annual QA for Elekta Unity MR-Linac using PTW BEAMSCAN MR
Jinzhong Yang, Ph.D., MD Anderson Cancer Center, Texas




Chance to Win!

Win one of three
Apple AirPod Pros!
Winners - must be present -
will be drawn at the end of the event



Ann Van Esch, Ph.D.
Ann Van Esch, Ph.D.

Dr. Ann Van Esch has been a practicing Medical Physicist for the past 23 years. She spent her first 5 years working at a University Hospital and during that time she specialized in IMRT and developed the algorithm that Varian uses for their portal dosimetry. Wanting to be a help to the broader Radiotherapy community, she started her own consulting firm, 7Sigma Radiotherapy Physics, which has been operating for 18 years. In her role, she has been used as a consultant in approximately 80 Radiation Therapy facilities throughout Europe, guiding and directing their Medical Physics staff in starting and implementing programs for IMRT, Rapid Arc, Stereotactic, and other programs. Her publications in IMRT, Rapid Arc and Stereotactic dosimetry have been recommended and used as educational standards.

She has a vast experience in using all the different manufacturers dosimetry equipment and has extensive knowledge, experience, and appreciation for and in using PTW Dosimetry Equipment.

More information about 7Sigma

Ann Van Esch, Ph.D.
7Sigma Radiotherapy Physics

George Cernica, Ph.D.
George Cernica, Ph.D.

Dr. George Cernica has been a practicing Medical Physicist for the past 15 years. He received his Ph.D. in 2007 and has been working with the Accuray Cyberknife device since 2009. He works for Aspekt Solutions supplying the Medical Physics staffing at Virginia Hospital Center. At present, they treat 50 new CK patients a month, giving them an average of 160 CK treatments per month. The breakdown of treatments they perform are as follows: prostate (30%), spine (20%), lung (20%), and brain & other sites making up the remainder. The MLC is used with 8-12 patients a day. They are performing approximately 20 CK patient QA procedures every month and have performed approximately 400 CK patient QA procedures over the past 2 years. The equipment they have used has been film, where higher resolution was needed, and the Mapcheck.

Recently, however, they purchased the PTW OCTAVIUS Detector 1600 SRS and have subsequently completed about 50 Patient QA procedures with it. The resolution and efficiency of the device have enabled them to both replace the Mapcheck and the need for film.

More information about Aspekt Solutions

George Cernica, Ph.D.
Virginia Hospital Center
Aspekt Solutions

Poonam Yadav, Ph.D.
Poonam Yadav, Ph.D.

Dr. Poonam Yadav has been extensively involved in the installation and commissioning of multiple MRIdian MR Linacs. The first was at University of Wisconsin, which was one of the earliest facilities to adopt the new technology. She was also involved with the MRIdian consortium of physicists that gave feedback to ViewRay. She subsequently moved to Northwestern University’s Feinberg School of Medicine in Chicago, and established the MRgRT program and managed the installation and commissioning of the facility's new MRIdian. With this new installation, she was able to use the Beamscan MR for the commissioning of the MRIdian. At Feinberg, she has continued her clinical research and has received multiple academic and industrial grants on reducing toxicity and enhancing precision in treatment delivery.

She is actively involved in longitudinal assessment and robust quality control of MRIdian linac.

Poonam's bio

Poonam Yadav, Ph.D.
Northwestern Medicine

William Y. Song, Ph.D.
William Y. Song, Ph.D.

Dr. William Song is a Professor and the Director of the CAMPEP accredited Medical Physics Graduate Program at Virginia Commonwealth University. He works in the Department of Radiation Oncology at the Massey Cancer Center. Dr. Song has been a practicing Medical Physicist for 14 years and has produced over 80 published papers covering a wide range of topics in Medical Physics. He has commissioned MRIdian MR-Linac as well as multiple conventional linacs. Of late, he has been involved in the new building project to house the new MRIdian MR-Linac at their facility which is the first MR-Linac to be installed in the state of Virginia. He has
overseen the commissioning of the MRIdian unit and has obtained a grant for optimizing MR-Linac overall workflow.

He has two Ph.D. students, one postdoctoral fellow, and multiple MS students who are working with him on this particular project.

William's bio

William Y. Song, Ph.D.
Virginia Commonwealth University

Jinzhong Yang, Ph.D.
Jinzhong Yang, Ph.D.

Dr. Jinzhong Yang is an Assistant Professor in the Department of Radiation Physics at the University of Texas MD Anderson Cancer Center. He is also the physics lead for the MR-Linac clinical operations at MD Anderson. Dr. Yang has been a practicing Medical Physicist for the past 7 years and has published more than 100 journal articles as well as edited a book in the field of Medical Physics. He has been intimately involved in  commissioning one of the first Elekta Unity MR Linacs installed in North America at MD Anderson, where also, in January of 2019, the first patient treatment on a Unity in North American took place. They did all the initial acceptance and commissioning of the Unity using the dosimetry equipment supplied by Elekta. They subsequently received their BEAMSCAN MR in early 2020 after the 510k was received and, since that time, Dr. Yang and his colleagues have completed 2 annuals using the BEAMSCAN MR.

Dr. Yang has recently been awarded a grant for leveraging artificial intelligence working with the Unity MR Linac.

Jinzhong Yang's bio

Jinzhong Yang, Ph.D.
MD Anderson Cancer Center

Ask the Expert

Take the opportunity to attend in our "Ask the Expert" sessions at our booth #5077.
Each expert will be available at our booth for 1 hour on a specific day to answer your questions related to their topic of expertise.


Monday, July 11th, 9:30 - 10:30 am


Beamscan and suitable detectors commissioning expert

Wolfram Laub, Ph.D.,
Aspekt Solutions

Monday, July 11th, 3:45 - 4:45pm

RT EPID 3D back-projection algorithm expert


Igor Olaciregui-Ruiz, Ph.D.,
Netherlands Cancer Institute

Tuesday, July 12th, 9:30 - 11:00am

Patient QA for small field treatments expert


Ann Van Esch, Ph.D.,
7Sigma Radiotherapy Physics

Tuesday, July 12th, 3:45 - 4:45pm

Commissioning & ongoing dosimetry with a MRIdian MR Linac expert


Poonam Yadav, Ph.D.,
Northwestern Medicine

Explore our Featured Products & Solutions

VERIQA - The Modular Software Platform for Comprehensive Patient QA


One Platform for all Patient QA Tasks:

  • Treatment Plan Visualization
  • Treatment Plan Evaluation
  • Pre-Treatment Verification
  • Treatment  Verification


VERIQA Website

VERIQA RT Monte Carlo 3D: 3D dose calculation with SciMoCa
VERIQA RT Monte Carlo 3D: 3D dose calculation with SciMoCa

"Secondary dose calculation systems should be completely independent from primary TPS. Accurate matching between the secondary dose calculational systems and the dosimetric characteristics of the linac is thereby essential for truly independent and valuable dose evaluation"

Prof. Sotiri Stathakis, Ph.D.
University of Texas Health Science
Center, San Antonio

VERIQA RT Monte Carlo 3D

Advanced 3D back-projection approach
Advanced 3D back-projection approach

“The EPID dose back-projection algorithm of VERIQA RT EPID 3D will offer a double benefit.
It will verify treatment delivery by using in vivo EPID measurements as well as increase efficiency in pre-treatment verification by using EPID images acquired “in air”, thus eliminating the need for phantom positioning and re-planning.”

Igor Olaciregui, Software & Physics Lead,
The Netherlands Cancer Institute - Antoni van Leeuwenhoek Hospital (NKI-AVL), Amsterdam




One phantom - modular solutions for 4D patient and machine QA

  • One system for patient and machine QA
  • 3D dose verification in phantom and patient geometry
  • Rotating phantom - true 3D, true isotropic geometry


Verifying treatment plans with OCTAVIUS 4D
Verifying treatment plans with OCTAVIUS 4D

How do I set up OCTAVIUS 4D for measurement? How are measurements performed? Which dose comparison tools are available?

The step-by-step video guides you through the entire workflow – from installation to evaluation.

OCTAVIUS Detectors
OCTAVIUS Detectors

Select the phantom and detector combination that is best for you and get started. Expand and upgrade it anytime later as your needs change or grow

  • Modular and scalable – various detector arrays and phantom tops available
  • Cutting-edge detector technology based on Gold Standard ionization chambers

RUBY - Modular QA phantoms for comprehensive testing of the entire treatment chain


As flexible as your needs.

The new modular phantom platform for

  • high-precision radiotherapy and


RUBY Website

RUBY - The Modular QA Phantom
RUBY - The Modular QA Phantom

Your advantages

  • Perform integrated tests of the entire treatment chain with one basic phantom by adding and expanding QA capabilities as and when you need them
  • Technologically advanced, new modular phantom platform with powerful, ready-to-use application-specific inserts
  • Comprehensive end-to-end testing of the entire SRS/SBRT treatment process with one single insert
  • Measurement-based patient-specific plan verification, including non-coplanar treatments, with film and different detector types
  • CT markers in phantom and all inserts for enhanced visibility
Watch the video!
Watch the video!

QRM Electron Density Phantom


Electron Density Phantom Highlights

  • Calibration of radiation oncology treatment plans
  • For the opimization of the delivered dose to the patient
  • Provides realistic tissue simulation and values within the higher density range (bones)
  • Tissue-equivalent inserts are available separately

QRM Electron Density Phantom Website

Artificial Intelligence in dosimetry
Artificial Intelligence in dosimetry

The Electron Density Phantom houses 5 different tissue-equivalent material inserts used for the HU to electron density calibration of CT scanners and radiation therapy treatment planning systems.

All tissue-equivalent materials represent the real human tissue with respect to physical density and electron density.

A new revised edition of the EDP provides tissue-equivalent realistic physical densities and electron densities of human tissues of highest interest in radiation oncology treatment planning.

The non-accordance of these values is a major shortcoming of other available electron density (or tissue-equivalent) phantoms.

The Electron Density Phantom is the first phantom to provide realistic tissue simulation and values in the higher density range (bone).

D100 compatible
D100 compatible
  • D100 is the ingenious concept for an interchangeable use of different phantoms
  • For use in combination with the Thorax, Abdomen and Oval Body Phantom, various D100 Insert Phantoms are available


Meet the exclusive
UNIDOS Tango Anniversary Edition,
showing the skyline of the city of Freiburg, where PTW is headquartered since 1922!


Join us on a journey through 100 years of PTW!

Get in Touch

Diese Seite existiert auch in Ihrer Sprache.
This page also exists in your language.
Sprache wechseln Change Language