Abstract
PurposeThis note describes the performance of a quality assurance (QA) tool built for daily checks of the Gamma Knife’s high definition motion management (HDMM) system.MethodsThe tool is a three‐dimensional (3D)‐printed platform with a raised corner in the center. A reflector post is placed at the corner and the HDMM tool is zeroed to this position. Gage blocks produce very accurate gaps between the post and corner and the HDMM system’s readout is compared to the gage block thickness. The HDMM system and tool were tested for noise, stability, reproducibility, linearity, accuracy and overall setup times plus ease of use.ResultsThe QA tool performed with accuracies better than 0.1 mm. The setup and use of this tool take less than two minutes making it a suitable tool for daily use.ConclusionThis QA tool is a cost‐effective solution that provides a fast and easy confirmation of the HDMM accuracy, making it suitable for daily QA checks of the HDMM system.
Highlights
Accuracy refers to the comparison of the average reading of the high definition motion management (HDMM) system against a known standard whereas precision refers to the reciprocal of the variance
The quality assurance (QA) tool was designed in Fusion 360 (AutoDesk, 2016, https://www.autodesk.com/products/fusion-360/overview) and printed on an Ultimaker-3 3D printer (Dynamism, 2016, https://ulti maker.com/3d-printers/ultimaker-3)
The QA tool was designed in Autodesk Fusion 360 and 3D printed
Summary
Accuracy refers to the comparison of the average reading of the HDMM system against a known standard whereas precision refers to the reciprocal of the variance. The HDMM system has inherent noise that impacts the accuracy and precision of the measurements This test tracks the position of a stationary reflector post over a 10-s measurement. Values for the x-, y- and z-axes were analyzed from the linearity data, but these were all one-dimensional shifts and do not address the accuracy when two- or three-dimensional. Gage blocks are readily available in sets and certifiable following the DIN681 standard. The QA tool was designed in Autodesk Fusion 360 and 3D printed It consists of (a) a stage that fits on the mask adaptor; (b) a movable reflector post that sits against a raised corner; and (c) gage blocks that offset the reflector post by accurate distances from the corner.
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