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How can I add customized (extension) data to the NIfTI-1 header?

April 26, 2017customized Data extension header nifti-1

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How can I add customized (extension) data to the NIfTI-1 header?

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(Bob Cox) There are two phases to this answer: clarifying where the image data is stored, and then discussing the NIfTI-1.1 approved way of storing information after the 348 byte header (and before the image data in a .nii file). Clarifying vox_offset: Of primary importance is the issue of where extended header data will be stored, and how a program is to know what is header data and what is image data. In NIfTI-1.1, the location of the image data is specified by the vox_offset header field.