J The presence of magnetic fields in a magnetic resonance accelerator(MR-linac)can affect the reference dosimetry,and thus the existing Code of Practices(CoPs)are inadequate for MR-linac.In this article,the characteristics of adsorbed dose to water and ionization chamber response in the presence of magnetic fields were introduced and a formalism for reference dosimetry in MR-linac was developed based on the existing CoPs,aiming to provide reference for dosimetric quality control and research work of MR-linac in China.
关键词
放射疗法/磁共振引导放射疗法/参考剂量/磁场修正因子/水吸收剂量
Key words
Radiotherapy/MR-guided radiotherapy/Reference dosimetry/Magnetic field correction factor/Absorbed dose to water