Figure 4
From: A high-resolution large-area detector for quality assurance in radiotherapy

First functional test using protons at the Bern medical cyclotron. (a) Acquired image showing the circular shape of the beam using a GAFCHROMIC® EBT3 film. (b) Acquired image showing the circular shape of the beam using the GEM-TFT detector. (c) LSB value vs beam intensity of the detector using the 18 MeV cyclotron. The dashed line represents the linear fit to the data up to 0.7nA (
).