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This is a U.S. Government computer system, which may be accessed and used only for authorized Government business by authorized personnel. Unauthorized access or use of this computer system may subject violators to criminal, civil, and/or administrative action. All information on this computer system may be intercepted, recorded, read, copied, and disclosed by and to authorized personnel for official purposes, including criminal investigations. Such information includes sensitive data encrypted to comply with confidentiality and privacy requirements. Access or use of this computer system by any person, whether authorized or unauthorized, constitutes consent to these terms. There is no right of privacy in this system.

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NIMH Data Archive
NDA ABCD CCF OAI NIAAADA AMP SCZ HEAL

Diffusion MRI

0 Shared Subjects

N/A
Neurosignal Recordings
DTI
09/28/2020
dmri01
09/28/2020
View Change History
01
Definition
Submission Template
Query Element Name Data Type Size Required Description Value Range Notes Aliases
subjectkey GUID Required The NDAR Global Unique Identifier (GUID) for research subject NDAR*
src_subject_id String 20 Required Subject ID how it's defined in lab/project
interview_date Date Required Date on which the interview/genetic test/sampling/imaging/biospecimen was completed. MM/DD/YYYY scan_date
interview_age Integer Required Age in months at the time of the interview/test/sampling/imaging. 0::1440 Age is rounded to chronological month. If the research participant is 15-days-old at time of interview, the appropriate value would be 0 months. If the participant is 16-days-old, the value would be 1 month. scan_age
sex String 20 Required Sex of subject at birth M;F; O; NR M = Male; F = Female; O=Other; NR = Not reported
std_ax File 15 Recommended Axial Diffusivity without free water elimination Specify units of wavelength
std_fa File 15 Recommended Fractional Anisotropy without free water elimination Specify units of wavelength
std_md File 15 Recommended Mean Diffusivity without free water elimination Specify units of wavelength
std_rd File 15 Recommended Radial Diffusivity without free water elimination Specify units of wavelength
fw_ax File 15 Recommended Axial Diffusivity with free water elimination Specify units of wavelength
fw_fa File 15 Recommended Fractional Anisotropy with free water elimination Specify units of wavelength
fw_rd File 15 Recommended Radial Diffusivity with free water elimination Specify units of wavelength
fw_vf File 15 Recommended Volume Fraction with free water elimination Specify units of wavelength
functional_connectome File Recommended 86x86 functional connectome matrix
structural_connectome File Recommended 86x86 structural connectome matrix
density_sc Float Recommended The proportion of nonzero edges to all possible edges 0::1
global_efficiency Integer 15 Recommended The average inverse shortest path length in the network Specify units of distance
characteristic_path_length_sc Integer 15 Recommended The average shortest path length in the network Specify units of distance
assortativity_sc Float Recommended The correlation coefficient between the degrees of all nodes on two opposite ends of a link. A positive assortativity coefficient indicates that nodes tend to link to other nodes with the same or similar degree -1::1
clustering_coefficient Float Recommended The fraction of triangles around a node, equivalent to the fraction of node's neighbors that are neighbors of each other 0::1
modularity Float Recommended Modularity quantifies the degree to which the network may be subdivided into groups in a way that maximizes the number of within-group edges, and minimizes the number of between-group edges 0::1
diameter Integer 15 Recommended Maximum distance between any two nodes in the graph Specify units of distance
small_worldness Float Recommended Ratio of clustering coefficient and characteristic path length between a connectome and a random graph
total_strength Float Recommended Sum of all edges in the connectome
interhemispheric_strength Float Recommended Sum of all edges that connect nodes in contralateral hemispheres
intrahemispheric_strength Float Recommended Sum of all edges that connect nodes that are within the same hemisphere
Data Structure

This page displays the data structure defined for the measure identified in the title and structure short name. The table below displays a list of data elements in this structure (also called variables) and the following information:

  • Element Name: This is the standard element name
  • Data Type: Which type of data this element is, e.g. String, Float, File location.
  • Size: If applicable, the character limit of this element
  • Required: This column displays whether the element is Required for valid submissions, Recommended for valid submissions, Conditional on other elements, or Optional
  • Description: A basic description
  • Value Range: Which values can appear validly in this element (case sensitive for strings)
  • Notes: Expanded description or notes on coding of values
  • Aliases: A list of currently supported Aliases (alternate element names)
  • For valid elements with shared data, on the far left is a Filter button you can use to view a summary of shared data for that element and apply a query filter to your Cart based on selected value ranges

At the top of this page you can also:

  • Use the search bar to filter the elements displayed. This will not filter on the Size of Required columns
  • Download a copy of this definition in CSV format
  • Download a blank CSV submission template prepopulated with the correct structure header rows ready to fill with subject records and upload

Please email the The NDA Help Desk with any questions.

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