51st AAPM Annual Meeting
Twyla Willoughby, M.D. Anderson Cancer Ctr Orlando, Orlando, FL, 32806, US
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AbstractID: 12012 Title: Performance-based QA for Radiotherapy: TG-147 – QA for
non-radiographic localization systems
History: Many devices for localizing and monitoring the patient have been developed over the
past few years. These devices come as a result of better hardware and software to delivery highly
conformal radiation. This task group was commissioned by the AAPM to make
recommendations about the quality assurance and use of non-radiographic localization and
monitoring systems. These systems include camera based systems, RF guidance systems, and
laser alignment systems.
General Outline of Report: The report addresses systems that do not use radiographic
localization and specifically describes several systems that are commercially available. Some
commercially available systems that are described in this report are Calypso System, VisionRT
AlignRT, LAP Galaxy, and C-Rad Sentinel; however the report is written in such as a way as to
be used for other systems as they may come available. The primary purpose of these devices is to
align the patient to the correct location for treatment. QA recommendations of the report focus
on installation recommendations as these systems are peripheral to the linear accelerator system,
but must interface with all aspects of the radiotherapy workflow. Some specific issues in multivendor
installs are addressed. The major component of the report focuses on commissioning of
these types of devices and on the routine QA of patient localization systems.
Major Highlights: For non-radiographic localization systems it is important that the system be
installed properly relative to the machine isocenter. In order to do this, the linear accelerator
mechanical QA should be performed and modifications performed as necessary. As part of the
initial install of these peripheral types of localization equipment, a testing of the various
communications between systems is important. The report also makes recommendations for
testing the integrity of the radiation delivery system following the addition of equipment. The
primary tool for QA of the localization system is the end to end test that can give the overall
localization accuracy for the device in conjunction with traditional imaging and treatment
planning. Recommendations about patient monitoring and tracking are also addressed.
Report as it relates to TG-100: This report makes recommendation on QA to insure that the
localization system is working properly. These recommendations could be included in the
institutions FEMA analysis in accordance with TG 100.
Timeline for report Release: This report is to be submitted for review this summer and should
be available for release sometime in 2010.
1.) The audience should be able to identify the types of localization devices included in
2.) The audience should be able to describe the general practice of patient localization and
how to implement a localization device
3.) The audience should be able to describe how to setup and perform an end to end test with
a localization device and record the devices overall localization accuracy.