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  • Laterality issue on fMRI image

    The laterality issue: different software will interpret fMRI images in different way (mainly refer to right/left side display), so will the functions offered by them. NIFTI toolbox provides series explanations on the issued. Here are some notes.

    Definition of LEFT and RIGHT
    If the display does not have labels, we define LEFT as the Left-Hand-Side
    of the Axial view, and RIGHT as the Right-Hand-Side of the Axial view.
    RAS (neurological convention): left cerebral hemisphere is at LEFT and
    right cerebral hemisphere is at RIGHT;
    LAS (radiological convention): right cerebral hemisphere is at LEFT and
    left cerebral hemisphere is at RIGHT;
    If the display has labels, note will be added to bring your attention.


    Laterality case in common softwares

    Software Input format Input laterality Input display Output format Output laterality
    SPM5/later ANALYZE RAS LAS NIfTI LAS
    SPM5/later ANALYZE LAS RAS NIfTI RAS
    MRIcro ANALYZE RAS RAS ANALYZE RAS
    MRIcro ANALYZE LAS LAS ANALYZE LAS
    MRIcron ANALYZE RAS RAS NIfTI RAS
    MRIcron ANALYZE LAS LAS NIfTI LAS
    load/save/view_nii ANALYZE RAS RAS NIfTI RAS
    load/save/view_nii ANALYZE LAS LAS NIfTI LAS
    load/save_untouch_nii ANALYZE RAS N/A ANALYZE RAS
    load/save_untouch_nii ANALYZE LAS N/A ANALYZE LAS

    Interpret laterality using load_nii command

    1. NIfTI toolbox never saves any file with sform = qform = 0. When you see that sform = qform = 0 in the structure that is loaded by "load_nii.m", it only means that the affine matrix has been properly interpreted. As a matter of fact, the file written by "save_nii.m" is always a NIfTI file with sform = 1 and qform = 0, and you can always check the real header information stored in any NIfTI (ANALYZE) file by using "load_untouch_nii.m". In other words, you can never save your data to a NIfTI file with sform = qform = 0.
      If you want to save your data to an ANALYZE format, you can do so by using "save_untouch_nii.m". In that case, there is neither sform nor qform in the
      ANALYZE header.
    2. Many other software assume that ANALYZE files are in neurological convention (RAS). Because there is really no orientation information stored in ANALYZE header, the laterality of an ANALYZE file is all based on the assumption.
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  • 原文地址:https://www.cnblogs.com/minks/p/5879367.html
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