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Peds - Diffusion Tensor Imaging

peds_dti

04

Low resolution diffusion tensor imaging (DTI) data as defined by the NIH Pediatric MRI Project

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Element NameData TypeSizeRequiredDescriptionValue RangeNotes
subjectkeyGUIDRequiredThe NDAR Global Unique Identifier (GUID) for research subjectNDAR*
src_subject_idString20RequiredSubject ID how it's defined in lab/project
timepoint_labelString5RequiredTimepoint/visit label
dti_age_days_dobIntegerRequiredAge in days to date of birth from DTI scan date. This may differ from the T1 date due to an offset in scan date between structural and DTI data.
dti_time_days_arbitrary_dateIntegerRecommendedTime in days calculated by subtracting an arbitrary date from the DTI scan date. Allows the user to identify ACR or Living Phantom scans from the same time in an anonymized way.
dti_time_days_to_t1IntegerRecommendedNumber of days delay time between T1 structural acquisition and DTI acquisition.
dti_release_versionString5RequiredVersion of the DTI data release. This release number is independent of the Structural MRI release number.
scanner_manufacturer_dtiString30RecommendedSiemens or GE as extract from the MINC header
scanner_software_versions_dtiString100RecommendedMRI scanner software version
mri_echo_time_dtiFloatRecommendedTE
mri_repetition_time_dtiFloatRecommendedTR
mri_excitation_pulse_angle_dtiFloatRecommendedexcitation pulse angle for DTI (degrees). Expected value is 90 degress.
mri_band_width_dtiFloatRecommendedBand width
mri_nex_dtiIntegerRecommendedNumber of excitations (NEX)
mri_field_of_view_raw_ap_dtiIntegerRecommendedfield of view in the anterior-posterior direction for the DWI images as acquired at the scanner before processing
mri_field_of_view_raw_lr_dtiIntegerRecommendedfield of view in the left-right direction for the DWI images as acquired at the scanner before processing
mri_voxel_width_raw_ap_dtiFloatRecommendedVoxel resolution in Anterior-Posterior direction for raw DWI data. AP = y direction for axial acquisition.
mri_voxel_width_raw_lr_dtiFloatRecommendedVoxel resolution in Left-Right direction for raw DWI data. LR = x direction for axial acquisition.
mri_voxel_width_raw_is_dtiFloatRecommendedVoxel resolution in Inferior-Superior direction for raw DWI data. IS = z for axial acquisition.
mri_number_slices_raw_dtiIntegerRecommendedNumber of slices for raw DWI data.
mri_field_of_view_corr_ap_dtiIntegerRecommendedField of view (FOV)in anterior-posterior direction for DWI data after artifact remediation and distortion correction.
mri_field_of_view_corr_lr_dtiIntegerRecommendedField of view (FOV)in left-right direction for DWI data after artifact remediation and distortion correction.
mri_voxel_width_corr_ap_dtiFloatRecommendedVoxel resolution in Anterior-Posterior direction for DWI data after artifact remediation and distortion correction.
mri_voxel_width_corr_lr_dtiFloatRecommendedVoxel resolution in Left-Right direction for DWI data after artifact remediation and distortion correction.
mri_voxel_width_corr_is_dtiFloatRecommendedVoxel resolution in Inferior-Superior direction for DWI data after artifact remediation and distortion correction.
mri_acquisition_matrix_dtiString30RecommendedImage acquisition matrix size.
mri_image_matrix_dtiString30RecommendedFinal image matrix size. Compared with the acquisition matrix size, this indicates in the images were interpolated by the scanner.
mri_number_slices_corr_dtiIntegerRecommendedNumber of slices for final output data.
mri_slice_gap_dtiFloatRecommendedSpace between slices. Should be 0. (mm)
mri_num_replicates_b1000_dtiIntegerRecommendedNumber of replicates of the basic 6 directions at b = 1000 s/mm2. Obj1 & Obj2 should be = 4
mri_num_replicates_b500_dtiIntegerRecommendedNumber of replicates of the basic 6 directions at b = 500s/mm2. Expected values: Obj1 = 0, Obj2 = 2
mri_num_vol_b1000_corr_dtiIntegerRecommendedFinal number of b1000 volumes included after artifact removal.
mri_num_vol_b500_corr_dtiIntegerRecommendedNumber of b500 volumes included after artifact removal.
mri_epi_correction_dtiString1RecommendedIs EPI correction performed? Y=yes, N=no
mri_epi_bspline_grid_size_dtiIntegerRecommendedValue of the bspline grid size used for EPI correction. Total grid size is the sum of this number plus 3 additional grid points for the required border size.
dti_registration_target_typeString2RecommendedImaging modality of target image used for EPI correction and/or reorientation. T1, T2 or PD
qc_num_volumes_dtiIntegerRecommendedQuality score for protocol violations; 0=no violation, 1=violation. Number of acquired volumes.0; 10 = No violation; 1 = Violation
qc_num_slices_dtiIntegerRecommendedQuality score for protocol violations; 0=no violation, 1=violation. Number of slices per DWI volume.0; 10 = No violation; 1 = Violation
qc_in_plane_resolution_dtiIntegerRecommendedQuality score for protocol violations; 0=no violation, 1=violation. Axial in-plane resoultion.0; 10 = No violation; 1 = Violation
qc_slice_thickness_dtiIntegerRecommendedQuality score for protocol violations; 0=no violation, 1=violation. Slice thickness.0; 10 = No violation; 1 = Violation
qc_zero_fill_acq_dtiIntegerRecommendedQuality score for protocol violations; 0=no violation, 1=violation. Protocol specified no zero filling at the time of acquisition.0; 10 = No violation; 1 = Violation
qc_nex_dtiIntegerRecommendedQuality score for protocol violations; 0=no violation, 1=violation. Protocol specifies NEX=1.0; 10 = No violation; 1 = Violation
qc_oblique_acq_dtiIntegerRecommendedQuality score for protocol violations; 0=no violation, 1=violation. Protocol specified pure axial acquisition only.0; 10 = No violation; 1 = Violation
qc_echo_time_dtiIntegerRecommendedQuality score for protocol violations; 0=no violation, 1=violation. Echo time must be the same for all replicates, including b1000 and b500.0; 10 = No violation; 1 = Violation
qc_gain_scale_dtiIntegerRecommendedQuality score for raw DWI data; 0=perfect, 1=minor problem, 2=moderate problem, 3=major problem. Gain differences between replicates, or scaling differences between b0 and DWI images.0; 1; 2; 3; 40 = Perfect; 1 = Minor problem; 2 = Moderate problem; 3 = Major problem
qc_brain_coverage_top_dtiIntegerRecommendedQuality score for raw DWI data; 0=perfect, 1=minor problem, 2=moderate problem, 3=major problem. Was the top of the brain fully included in acquisition?0; 1; 2; 3; 40 = Perfect; 1 = Minor problem; 2 = Moderate problem; 3 = Major problem
qc_brain_coverage_bottom_dtiIntegerRecommendedQuality score for raw DWI data; 0=perfect, 1=minor problem, 2=moderate problem, 3=major problem. Was the bottom of the brain (cerebellum) fully included in acquisition?0; 1; 2; 3; 40 = Perfect; 1 = Minor problem; 2 = Moderate problem; 3 = Major problem
qc_ghosting_dtiIntegerRecommendedQuality score for raw DWI data; 0=perfect, 1=minor problem, 2=moderate problem, 3=major problem. Severity of ghosting.0; 1; 2; 3; 40 = Perfect; 1 = Minor problem; 2 = Moderate problem; 3 = Major problem
qc_nosie_artifacts_dtiIntegerRecommendedQuality score for raw DWI data; 0=perfect, 1=minor problem, 2=moderate problem, 3=major problem. Severity of noise, spike noise, RF, and recon artifacts.0; 1; 2; 3; 40 = Perfect; 1 = Minor problem; 2 = Moderate problem; 3 = Major problem
qc_motion_signal_drop_dtiIntegerRecommendedQuality score for raw DWI data; 0=perfect, 1=minor problem, 2=moderate problem, 3=major problem. Severity of signal dropouts due to motion.0; 1; 2; 3; 40 = Perfect; 1 = Minor problem; 2 = Moderate problem; 3 = Major problem
qc_motion_eddy_dist_dtiIntegerRecommendedQuality score for raw DWI data; 0=perfect, 1=minor problem, 2=moderate problem, 3=major problem. Severity of misregistration due to motion and eddy distortion.0; 1; 2; 3; 40 = Perfect; 1 = Minor problem; 2 = Moderate problem; 3 = Major problem
qc_epi_dist_dtiIntegerRecommendedQuality score for raw DWI data; 0=perfect, 1=minor problem, 2=moderate problem, 3=major problem. Severity of susceptibility related EPI distortion.0; 1; 2; 3; 40 = Perfect; 1 = Minor problem; 2 = Moderate problem; 3 = Major problem
qc_cardiac_artifacts_dtiIntegerRecommendedQuality score for raw DWI data; 0=perfect, 1=minor problem, 2=moderate problem, 3=major problem. Severity of cardiac pulsation artifacts.0; 1; 2; 3; 40 = Perfect; 1 = Minor problem; 2 = Moderate problem; 3 = Major problem
qc_qual_motion_eddy_corr_dtiIntegerRecommendedQuality score for corrected DWI data; 0=perfect, 1=minor problem, 2=moderate problem, 3=major problem. Quality of the correction of misregistration due to motion and eddy distortion.0; 1; 2; 3; 40 = Perfect; 1 = Minor problem; 2 = Moderate problem; 3 = Major problem
qc_qual_epi_corr_dtiIntegerRecommendedQuality score for corrected DWI data; 0=perfect, 1=minor problem, 2=moderate problem, 3=major problem. Quality of correction for EPI distortion.0; 1; 2; 3; 40 = Perfect; 1 = Minor problem; 2 = Moderate problem; 3 = Major problem
qc_region_frontal_dtiIntegerRecommendedRegional quality score for tensor derived quantities; 0=perfect, 1=minor problem, 2=moderate problem, 3=major problem. Frontal lobes.0; 1; 2; 3; 40 = Perfect; 1 = Minor problem; 2 = Moderate problem; 3 = Major problem
qc_region_parietal_dtiIntegerRecommendedRegional quality score for tensor derived quantities; 0=perfect, 1=minor problem, 2=moderate problem, 3=major problem. Parietal lobes.0; 1; 2; 3; 40 = Perfect; 1 = Minor problem; 2 = Moderate problem; 3 = Major problem
qc_region_occipital_dtiIntegerRecommendedRegional quality score for tensor derived quantities; 0=perfect, 1=minor problem, 2=moderate problem, 3=major problem. Occipital lobes.0; 1; 2; 3; 40 = Perfect; 1 = Minor problem; 2 = Moderate problem; 3 = Major problem
qc_region_temporal_dtiIntegerRecommendedRegional quality score for tensor derived quantities; 0=perfect, 1=minor problem, 2=moderate problem, 3=major problem. Temporal lobes.0; 1; 2; 3; 40 = Perfect; 1 = Minor problem; 2 = Moderate problem; 3 = Major problem
qc_region_cerebellum_bs_dtiIntegerRecommendedRegional quality score for tensor derived quantities; 0=perfect, 1=minor problem, 2=moderate problem, 3=major problem. Cerebellum and brainstem. Likely affected by cardiac pulsation.0; 1; 2; 3; 40 = Perfect; 1 = Minor problem; 2 = Moderate problem; 3 = Major problem
qc_region_central_brain_dtiIntegerRecommendedRegional quality score for tensor derived quantities; 0=perfect, 1=minor problem, 2=moderate problem, 3=major problem. Central brain regions (Ask Ami - midbrain?).0; 1; 2; 3; 40 = Perfect; 1 = Minor problem; 2 = Moderate problem; 3 = Major problem
qc_region_top_brain_dtiIntegerRecommendedRegional quality score for tensor derived quantities; 0=perfect, 1=minor problem, 2=moderate problem, 3=major problem. Top of the brain.0; 1; 2; 3; 40 = Perfect; 1 = Minor problem; 2 = Moderate problem; 3 = Major problem
qc_region_global_dtiIntegerRecommendedRegional quality score for tensor derived quantities; 0=perfect, 1=minor problem, 2=moderate problem, 3=major problem. Whole brain, overall quality of tensor derived maps.0; 1; 2; 3; 40 = Perfect; 1 = Minor problem; 2 = Moderate problem; 3 = Major problem
mri_tensor_fit_type_dtiString5RequiredAlgorithm used for tensor fitting. Options are N1=non-linear, R1=RESTORE robust, iR1=iRESTORE robust fitting. The option selected provided the best results.
dti_fa_image_niiFileRecommendedFractional Anisotropy image in nifti format.
dti_ra_image_niiFileRecommendedRelative Anisotropy image in nifti format.
dti_li_image_niiFileRecommendedLattice Index image in nifti format.
dti_tr_image_niiFileRecommendedTrace ADC image in nifti format.
dti_ev_image_niiFileRecommendedEigenvalue image in 4D nifti format. Volumes are in the order lambda1, lambda2, lambda3.
dti_cs_image_niiFileRecommendedChi-Square map in nifti format. Measure of the goodness of fit of the data.
dti_out_image_niiFileRecommendedOutlier map in nifti format. Created only if RESTORE or iRESTORE robust fitting was used. Indicates number of outliers rejected as a percent of the total number of volumes less the degrees of freedom (dof=7 for tensor fitting).
dti_dec_image_niiFileRecommendedDirectional Encoded Color (DEC) image in nifti format.
dti_mask_image_niiFileRecommendedMask image used in tensor fitting
dti_tal_noscale_t1_niiFileRecommendedT1W image in Tal no-scale space in nifti format
dti_tal_noscale_t2_niiFileRecommendedT2W image in Tal no-scale space in nifti format
dti_tal_noscale_pd_niiFileRecommendedPDW image in Tal no-scale space in nifti format
dti_dwi_raw_imagesFileRecommendedAll DWI images that passed minimum quality assessment. Images are saved slice by slice in raw floating point format. .list, .path and .bmtxt files are provided for opening in TORTOISE. Provided in a .tar.gz file.
dti_dwi_raw_corrected_imagesFileRecommendedAll DWI images that passed minimum quality assessment, after artifact remediation and distortion correction, plus computed noise correction for interpolation, tensor, amplitude and mask images. Compatible with TORTOISE, and raw floating point images.
dti_tensor_imagesFileRecommendedComputed tensor, amplitude and mask images. Compatible with TORTOISE. All tensor derived quantities can be computed from these files easily in TORTOISE.
dti_dwi_raw_full_imagesFileRecommendedRaw uncorrected images in raw floating point format, includes all b500 images as well as b1000 images - used only for Living Phantom data.
dti_dwi_raw_corr_full_imagesFileRecommendedRaw corrected DWI images in floating point format, including all b500 and b1000 images - used only for Living Phantom
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
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  • Size: If applicable, the character limit of this element
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  • 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
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Distribution for DataStructure: peds_dti04 and Element:
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