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Luminescence Imaging of Water During Carbon-Ion Irradiation

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S Yamamoto

S Yamamoto*, T Akagi , T Yamashita , T Toshito , M Komori , Nagoya University Graduate School of Medicine, Nagoya, Aichi Prefecture


SU-H4-GePD-J(B)-2 (Sunday, July 30, 2017) 4:30 PM - 5:00 PM Room: Joint Imaging-Therapy ePoster Lounge - B

Purpose: We previously reported that the luminescence imaging of water during proton irradiation is possible and can be used for range estimation. However, since it remains unclear whether such luminescence imaging of water is possible for carbon-ion irradiation, we conducted luminescence imaging of it during carbon-ion irradiation and estimated the ranges and beam widths.

Methods: We placed a water phantom on a patient couch with a carbon-ion therapy system and measured the luminescence images with a high-sensitivity cooled charge-coupled device (CCD) camera during pencil beam carbon-ion irradiations. We also conducted imaging of the phantoms of an acrylic block, and a plastic scintillator and compared their intensity and distribution with those of a water phantom.

Results: The luminescence images of the water phantom during the 245MeV/n carbon-ion irradiation showed clear Bragg peaks, and the measured carbon-ion ranges from the images were the same as those obtained with a simulation. The image also showed high intensity at the surface part of the water from Cerenkov-light. The widths of the pencil beam carbon-ion and nuclear spallation could be estimated from the images. The acrylic phantom’s luminescence image produced seven times higher luminescence and had a 13% shorter range than that of water. The plastic scintillator showed ~15,000 times higher light than that of water.

Conclusion: Luminescence imaging during carbon-ion irradiation of water is possible and has the potential to become a new method for range as well as width estimations in carbon-ion therapy.

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