Template: / sub-/ func|anat|dwi/ [_space-][_desc-]_. Processing in this context means transformations of data that does not change the number of dimensions of the input and are not explicitly covered by other Datatypes in the specification. Examples: Motion-corrected, temporally denoised, and transformed to MNI space bold files. Inhomogeneity corrected and skull stripped T1w files. Motion-corrected dwi files. The space keyword denotes the space of the file with a controlled vocabulary of values - see BEP014 for details. The desc keyword is a general purpose field with freeform values. To distinguish between multiple different versions of processing for the same input data the desc keyword should be used. Note that even though space and desc are optional at least one of them needs to be defined to avoid name conflict with the BIDS-Raw file. Examples: pipeline1/sub-001/ func/ sub-001_task-rest_run-1_space-MNI305_bold.nii.gz sub-001_task-rest_run-1_space-MNI305_bold.json pipeline1/sub-001/ func/ sub-001_task-rest_run-1_desc-MC_bold.nii.gz sub-001_task-rest_run-1_desc-MC_bold.json OR sub-001_task-rest_run-1_desc-fmriprep_bold.nii.gz sub-001_task-rest_run-1_desc-fmriprep_bold.json All REQUIRED metadata fields coming from a derivative file’s source file(s) MUST be propagated to the JSON description of the derivative unless the processing makes them invalid (e.g., if a source 4D image is averaged to create a single static volume, a SamplingFrequency property would no longer be relevant). In addition, all processed files include the following metadata JSON fields: Key Description Value for unprocessed data Space REQUIRED. Keyword denoting which space the processed file is in see BEP014 for details. ‘orig’ SkullStripped REQUIRED. Whether the volume was skull stripped (non-brain voxels set to zero) or not. false Masks Template: / sub-/ func|anat|dwi/ [_space-][_desc-]_mask.nii.gz A binary (1 - inside, 0 outside) mask in the space defined by (see Table targets/spaces). By default (i.e., if no transformation has taken place) the value of space should be set to “orig”. Key Description RawSources Elevated from OPTIONAL to REQUIRED Space REQUIRED. Keyword denoting which space the processed file is in see BEP014 for details. ‘orig’ Type RECOMMENDED. Short identifier of the mask. Restricted values: “Brain” - brain mask “Lesion” - lesion mask “Face” - face mask “ROI” - ROI mask Examples: func_loc/ sub-001/ func/ sub-001_task-rest_run-1_space-MNI305_desc-PFC_mask.nii.gz manual_masks/ sub-001/ anat/ sub-001_T1w_label-desc_mask.nii.gz Future releases / work-product / not to be included in the first release BIDS Extension Proposal 21 (BEP021): Common Electrophysiological Derivatives BIDS Extension Proposal 15 (BEP015): Mapping file BIDS Extension Proposal 22 (BEP022): PET preprocessing derivatives BIDS Extension Proposal 23 (BEP023): MRSI derivatives BIDS Extension Proposal 17 (BEP017): Generic BIDS connectivity data schema Atlases reference_atlases/ sub-001/ anat/ sub-001_t1w_label-AAL_atlas.nii.gz Label name Description AAL2 Updated version of Automated Anatomical Labeling [Tzourio-Mazoyer, 2002]) where 120 regions are extracted using a macroscopic anatomical parcellation of the MNI MRI single-subject brain. Neuromorphometrics Maximum probability tissue labels derived from the “MICCAI 2012 Grand Challenge and Workshop on Multi-Atlas Labeling” containing 140 cortical and subcortical regions in MNI space. http://www.neuromorphometrics.com/ AICHA Atlas of Intrinsic Connectivity of Homotopic Areas, a functional brain ROIs atlas based on resting-state fMRI data acquired in 281 individuals containing 384 regions of the whole brain in MNI space. http://www.gin.cnrs.fr/AICHA-344?lang=en LPBA40 Atlas produced from a set of whole-head MRI of 40 human volunteers [Shattuck, 2008]. Each MRI was manually delineated to identify a set of 56 cortical and subcortical regions in MNI space. JHUDTI81 Also known as ICBM-DTI-81 white-matter labels atlas [Wakana et al., 2007; Hua et al., 2008]. 48 white matter tract labels were created by hand segmentation of a standard-space average of diffusion MRI tensor maps from 81 subjects; mean age 39 (18:59), M:42, F: 39. http://www.loni.usc.edu/ICBM/Downloads/Downloads_DTI-81.shtml JHUTracts[0|25|50] Also known as JHU white-matter tractography atlas [Mori et al., 2005]. 20 structures were identified probabilistically by averaging the results of running deterministic tractography on 28 normal subjects (mean age 29, M:17, F:11). https://fsl.fmrib.ox.ac.uk/fsl/fslwiki/Atlases Desikan Destrieux