1. kadhikary on December 8, 2022 at 4:01 pm

    How large is the 60cm collimator at 100cm? is this right? it is in treatment machine( CK).

    • Max (editor) on December 8, 2022 at 4:49 pm

      Should be mm, corrected now.

  2. kadhikary on January 3, 2023 at 11:31 am

    Where did you get the “figure 66” from?

  3. kadhikary on January 4, 2023 at 9:52 am

    SSD is 80cm for CK. It also is calibrated at SAD tech, during commissioning it collects the data of TPRs only(not PDDs) . TG-51 has kq value with respect to PPD%@100 SSD(10×10) setup. Many uncertainties during transferring factors may arise.
    Would you please elaborate?

    • Max (editor) on January 4, 2023 at 11:12 am

      Hi Kadhikary,

      kQ values can only be determined in the TG-51 formalism using PDD at 100cm SSD. You are correct that TPRs go into the planning system to create a beam model, but PDD must still be collected to determine kQ for machine calibration.


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