12-23 October 2020
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Characterization of an In-Beam PET prototype for Heavy-Ion Cancer Therapy Device

13 Oct 2020, 16:25
Mini Oral and Poster Control, Monitoring,Test and Real Time Diagnostics Systems Poster session B-01


Dr YAN, junwei


Heavy-Ion Cancer Therapy Device (HICTD) developed by the Institute of Modern Physics of the Chinese Academy of Sciences has been equipped for clinical application. The positron emission tomography (PET) located on the beam line, called In-Beam PET, is a key detector in HICTD, which is employed for monitoring during heavy-ion therapy beta+ emitters like $^{11}$C, $^{15}$O, $^{10}$C are generated in irradiated tissues by nuclear reactions. The measurement of the time, energy and position information of this activity, immediately after patient irradiation, can lead to information on the effective delivered dose. The prototype is constructed with a Dual-Head Planar-Type detector consisting of 2 detection units. Each unit is made up of a position sensitive photomultiplier coupled to a square matrix of same size of LYSO scintillating crystals (2×2×15 mm$^{3}$ pixel dimensions). Four signals from each detector are acquired through a dedicated readout electronic system that performs signal amplification, shaping, A/D conversion and area calculation in digital signal processing domian. The In-Beam PET prototype has been characterized in the lab, energy and time resolutions were measured using a 22Na radioactive source. The validation of the prototype was performed using different energy ion-beam at the HICTD beam line of PMMA phantoms. A good correlation between the position of the activity distal edge and the thickness of the beam range shifter was found along the axial direction.

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