Apparatus for acquiring positron emission tomography data when irradiating an object (20) with a hadron beam (B), the apparatus comprising a plurality of detectors (10) and a data processing system (12, 15). The data processing system (12, 15) is configured to process the detection data according to the following steps: a) determining a temporal distribution of the coincidence event rate acquired by the respective detector (10), b) sampling each spill interval with a sampling frequency of the order of magnitude of GHz to obtain a respective fine grained event rate distribution; c) for each spill interval: - c1) analysing frequencies of the fine grained event rate distribution to find an initial frequency value fo compatible with the radiofrequency signal of the hadron beam; - c2) from the initial frequency value, estimating period Ts of the micro-bunches and transforming time values of the coincidence events in the spill interval into values of phase relative to an arbitrary phase, based on the estimated period of the micro-bunches; and - c3) at each micro-bunch of the spill interval, executing filtering to remove coincidence events around a peak associated with background noise induced by the hadron beam and keep the remaining coincidence events of the micro-bunch.

Metodo e apparato per l'acquisizione dati per tomografia ad emissione di positroni in adroterapia a fascio acceso

giancarlo sportelli
;
maria giuseppina bisogni
Funding Acquisition
;
matteo morrocchi;niccolo' camarlinghi
2018

Abstract

Apparatus for acquiring positron emission tomography data when irradiating an object (20) with a hadron beam (B), the apparatus comprising a plurality of detectors (10) and a data processing system (12, 15). The data processing system (12, 15) is configured to process the detection data according to the following steps: a) determining a temporal distribution of the coincidence event rate acquired by the respective detector (10), b) sampling each spill interval with a sampling frequency of the order of magnitude of GHz to obtain a respective fine grained event rate distribution; c) for each spill interval: - c1) analysing frequencies of the fine grained event rate distribution to find an initial frequency value fo compatible with the radiofrequency signal of the hadron beam; - c2) from the initial frequency value, estimating period Ts of the micro-bunches and transforming time values of the coincidence events in the spill interval into values of phase relative to an arbitrary phase, based on the estimated period of the micro-bunches; and - c3) at each micro-bunch of the spill interval, executing filtering to remove coincidence events around a peak associated with background noise induced by the hadron beam and keep the remaining coincidence events of the micro-bunch.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11568/1013900
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