TY  - JOUR
AU  - Ros Garcia, A.
AU  - Barrio, J.
AU  - Etxebeste, A.
AU  - Garcia-Lopez, J.
AU  - Jimenez-Ramos, M. C.
AU  - Lacasta, C.
AU  - Muñoz, E.
AU  - Oliver, J. F.
AU  - Roser, J.
AU  - Llosa, G.
PY  - 2020
DA  - 2020//
TI  - MACACO II test-beam with high energy photons
T2  - Phys. Med. Biol.
JO  - Physics in Medicine and Biology
SP  - 245027 - 12pp
VL  - 65
IS  - 24
PB  - Iop Publishing Ltd
KW  - Compton imaging
KW  - Compton camera
KW  - proton therapy
KW  - LaBr3
KW  - test-beam
KW  - image reconstruction
AB  - The IRIS group at IFIC Valencia is developing a three-layer Compton camera for treatment monitoring in proton therapy. The system is composed of three detector planes, each made of a LaBr3<i monolithic crystal coupled to a SiPM array. Having obtained successful results with the first prototype (MACACO) that demonstrated the feasibility of the proposed technology, a second prototype (MACACO II) with improved performance has been developed, and is the subject of this work. The new system has an enhanced detector energy resolution which translates into a higher spatial resolution of the telescope. The image reconstruction method has also been improved with an accurate model of the sensitivity matrix. The device has been tested with high energy photons at the National Accelerator Centre (CNA, Seville). The tests involved a proton beam of 18 MeV impinging on a graphite target, to produce 4.4 MeV photons. Data were taken at different system positions of the telescope with the first detector at 65 and 160 mm from the target, and at different beam intensities. The measurements allowed successful reconstruction of the photon emission distribution at two target positions separated by 5 mm in different telescope configurations. This result was obtained both with data recorded in the first and second telescope planes (two interaction events) and, for the first time in beam experiments, with data recorded in the three planes (three interaction events).
SN  - 0031-9155
UR  - https://doi.org/10.1088/1361-6560/abc5cd
DO  - 10.1088/1361-6560/abc5cd
LA  - English
N1  - WOS:000600803000001
ID  - RosGarcia_etal2020
ER  -