Approach to 3D dose verification by utilizing autoactivation

作者：Nakajima Yasunori^*; Kohno Toshiyuki; Inaniwa Taku; Sato Shinji; Yoshida Eiji; Yamaya Taiga; Tsuruta Yuki; Sihver Lembit

来源：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment , 2011, 648: S119-S121.

DOI：10.1016/j.nima.2010.12.078

• 3-D
• Dose
• Verification
• PET
• Carbon therapy

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.

• 出版日期2011-8-21