ESTRO 2024 - Abstract Book

S3269

Physics - Detectors, dose measurement and phantoms

ESTRO 2024

Figure 2 – Dose difference between ion chamber and EPID corrected (with specific and global fit) and uncorrected reading

Conclusion:

A stable global reading-to-dose conversion is determined for aS1200, dependent on the field size. Accuracy in the dose determination is similar in the cases of global or detector-specific conversion factors. However, a missing correction would lead to dosimetric errors unacceptable if the detector is used for dosimetric purposes.

Keywords: EPID, reading-to-dose conversion

References:

[1] Nicolini G, Fogliata A, Vanetti E, Clivio A, Cozzi L. GLAaS: An absolute dose calibration algorithm for an amorphous silicon portal imager. Applications to IMRT verifications. Med Phys 2006;33(8):2839-2851.

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Dose perturbation due to surgical clips and titanium mesh in proton therapy

Kuan Huei, James Lee 1 , Yun Ming Wong 2 , Ghee Ann Clifford Chua 3 , Kah Seng Lew 3 , Wei Yang Calvin Koh 3 , Andrew Wibawa 3 , Zubin Master 3 , Andrew Bettiol 1 , Sung Yong Park 3 , Hong Qi Tan 3