Dosimetric study demonstrates rapid depth-dose attenuation and scattered radiation in grid fields, highlighting clinical considerations for large-tumor palliative radiotherapy.
A single large dose of megavoltage x-rays delivered through a grid is currently being utilized by some centres for palliative radiotherapy treatments of large tumours. In this note, we investigate the dosimetry of grid therapy using two-dimensional film dosimetry and three-dimensional gel dosimetry. It is shown that the radiation dose is attenuated more rapidly with depth in a grid field than an open field, and that even shielded regions receive approximately 25% of the dose to the unshielded areas.
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Trapp et al. (2004) studied this question.
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