Machine QA
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Delta4 moves machine QA to an advanced and efficient level: • • • • • • Advanced machine QA done in a few minutes Stability check with high accuracy and detailed analysis Beam constancy at various gantry angles MLC performance check at various gantry angles Film-free picket fence test Discover and track long-term effects and trends

Advanced machine QA done in a few minutes The Machine QA option for your Delta4 system coupled with the advanced hardware of the Delta4 system allows the user to perform periodic machine QA and analyze the constancy of therapy machines. At any time, measurements can be compared with TPS data or a reference measurement, typically obtained after maintenance and acceptance of the machine. The measurement can be run directly in the RT machine’s service mode, setting up the configuration directly in Delta4. Alternatively, the Machine QA option lets the user create a DICOM RT Plan file including...

Beam constancy at various gantry angles Traditionally, machine QA is often limited to the upright gantry position. With the Delta4 Machine QA option, beam constancy can be checked at various gantry angles (e.g., compare data from four different projections). MLC performance check in various gantry angles and picket fence test The picket fence test was originally used to check the reproducibility of leaf gap between opposite MLC leaves using a radiographic film. In Delta4, this test is now expanded yet made easy. A DICOM RT Plan file is created in the Delta4 software to run the MLC leafs in...

RapidArc™ is a trademark of Varian Medical Systems. TomoTherapy ® is a registered trademark of ThomoTherapy Inc. We had an opportunity to thoroughly evaluate the Delta4 dosimeter prior to clinical use. We have validated it for step-and-shoot IMRT and TomoTherapy, with good results. The design of the device is very clever and a great deal of dosimetric information is available virtually instantaneously after the plan is delivered. The major advantage is the ability to compare dose at the fraction, beam or even individual segment levels, which allows to quickly evaluate and explain any...