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Approach to 3D dose verification by utilizing autoactivation

Y. Nakajima ; T. Kohno ; T. Inaniwa ; S. Sato ; E. Yoshida ; T. Yamaya ; Y. Tsuruta ; Lembit Sihver (Institutionen för teknisk fysik, Nukleär teknik)
Nuclear Instruments & Methods in Physics Research Section a-Accelerators Spectrometers Detectors and Associated Equipment (0168-9002). Vol. 648 (Supplement 1) (2011), p. S119-S121.
[Artikel, refereegranskad vetenskaplig]

To evaluate the deposited dose distribution in a target, we have proposed to utilize the annihilation gamma-rays emitted from the positron emitters distributed in the target irradiated with stable heavy-ion beams. Verification of the one dimensional (1-D) dose distributions along and perpendicular to a beam axis was achieved through our previous works. The purpose of this work is to verify 3-D dose distributions. As the first attempt uniform PMMA targets were irradiated in simple rectangular parallelepiped shapes, and the annihilation gamma-rays were detected with a PET scanner. By comparing the detected annihilation gamma-ray distributions with the calculated ones the dose distributions were estimated. As a result the estimated positions of the distal edges of the dose distributions were in agreement with the measured ones within 1 mm. However, the estimated positions of the proximal edges were different from the measured ones by 5-9 mm depending on the thickness of the irradiation filed.

Nyckelord: 3-D, Dose, Verification, PET, Carbon therapy, fragmentation reactions

Denna post skapades 2012-07-16.
CPL Pubid: 160535


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Institutionen för teknisk fysik, Nukleär teknik (2006-2015)



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