Presentation A patient-specific QA procedure for moving target irradiation in scanned ion therapy

Hara, Yousuke  ,  Furukawa, Takuji  ,  Mizushima, Kota  ,  Noda, Koji  ,  Saotome, Naoya  ,  Saraya, Yuichi  ,  Shirai, Toshiyuki  ,  Tansho, Ryohei

Three-dimensional (3D) pencil-beam scanning technique has been utilized since 2011 in NIRS-HIMAC. Beam delivery system and treatment planning software (TPS) require dosimetric patient-specific QA to check each individual plan. Any change in the scanned beams will result in a significant impact on the irradiation dose. Therefore, patient-specific QA for moving target irradiation requires additional procedure. In an additional QA for moving target irradiation, we placed 2D ionization chamber on the PMMA plate tilted with respect to the beam axis. The PMMA plate was set on the stage of the moving phantom. The moving phantom was moved according to patient data. We measured the dose distribution for both the static target and the moving target. We compared the results for the moving target with those for the static targets by means of a gamma index analysis In the additional patient-specific QA, the gamma analysis between the moving and static targets showed the good agreement. We confirmed that this new technique was a beneficial QA procedure for moving target irradiation.
The 2015 International Beam Instrumentation Conference (IBIC 2015)

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