Stereotactic radiotherapy involves the very precise delivery of narrow beams of radiation. Measurement of the properties of those beams is complicated due to their small size, and conversion to dose requires the application of ambiguous correction factors. Physicists from the Centre for Medical Radiation Physics (CMRP) at the University of Wollongong have spent a decade developing very small solid state detectors for improving such measurements. During November 28 – December 2, three members of the CMRP, Marco Petasecca, Giordano Biasi and Sultan Alhujaili, visited to work with our group and the clinical physicists at the Sir Charles Gairdner Hospital to evaluate the new detectors with the CyberKnife system. A large number of measurements were undertaken during the week to compare measurements with those undertaken with more conventional measurements with the hope that a new generation of detectors can become available to enable easier, more precise characterisation of stereotactic radiotherapy beams.