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Field matching in craniospinal irradiation.

We read with interest the technical note of Cheng et al [1] on the dose in the junction between adjacent orthogonal fields in craniospinal irradiation. For the most part, their results support those reported previously by us [2], and we are pleased to see this independent validation. The modest differences between their dose profiles and ours may be explained by the fact that the composite distributions are sensitive to the behaviour of the dose in and near the penumbra, which may vary for different treatment machines.