Purpose This 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. Methods The 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. Results The 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. Conclusion This 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.
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