An algorithmic approach to single‐probe Cherenkov removal in pulsed x‐ray beams

• DOI: 10.1002/mp.13383
• Publication Date: 2019-01-10T18:38:27Z
• Authors: James Archer; Levi Madden; Enbang Li; Dean Wilkinson; Anatoly B. Rosenfeld
• Keywords: Cherenkov detector; SIGNAL (programming language)

Purpose The removal of Cherenkov light in an optical dosimetry system is important process to ensure accurate without compromising spatial resolution. Many solutions have been presented the literature, each with advantages and disadvantages. We present a methodology remove from scintillator fiber optic dosimeter pulsed megavoltage x‐ray beam using temporal waveform across pulse. Methods A sample can be measured by exposing only beam. By assuming that closely matches intensity incident radiation, this convoluted instantaneous scintillation response function generate expected signal. finding least‐squares fit between these two functions experimental data, estimated contribution subtracted off net This applied for arbitrarily complex waveforms (within 2 ns timing resolution data acquisition), fact, results suggest more fluctuations provide better data. Results Four profiles different field sizes energies were found method. They matched references ionization chamber average differences no than 4%. Noisy are assumed primary cause analyzed IC results. propose methods improving optimizing acquisition analysis processes. Conclusions These demonstrate it possible effective single probe use fitting complicated signal pulsed‐beam dosimetry.