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The small-field radiotherapy is a developing technique because it can reduce the damage to normal tissues. However measurement of the dose distributions of small radiation fields in radiotherapy is a challenge. In this work, we designed and produced an optic fiber X-ray sensor array with high spatial resolution. The sensing array includes 7 sensing probes connecting to an 8-channel optical switch and a photon counting detector (PCD). To verify the practicality of the system, these sensors were measured under a 10×10 cm2 field of a medical linear accelerator. For the small-field application, the dose distribution of radiotherapy fields 1×1 cm2 and 0.8×0.8 cm2 were measured. The distribution of these small radiotherapy fields were given based on the experimental results.
(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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