Progress in Medical Physics

Table. 4.

Table. 4.

Differences between the measured and calculated Sc values for MLC-defined square field sizes ranging from 4×4 cm2 to the fixed jaw opening size

Jaw-defined field size (cm2) DSMa DSM+MLCb (this work) P-value


Mean (%) Maximum (%) Mean (%) Maximum (%)
10×10 0.109 0.169 0.090 0.217 0.051
15×15 0.095 0.116 0.055 0.136 < 0.001
20×20 0.114 0.133 0.056 0.163 < 0.001

Sc, head scatter factor; MLC, multi-leaf collimator; DSM, dual-source model.

aDeveloped by Jiang et al. [11].

bDSM in conjunction with MLC scatter source developed in this study.

Progress in Medical Physics 2021;32:137-44 https://doi.org/10.14316/pmp.2021.32.4.137
© 2021 Progress in Medical Physics