Data Issues

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Date Issue Description
29/3/2019

fMRI TR stated incorrectly in dataset

Converted fMRI data contains incorrect TR of 1 second in NIfTI headers when in fact the TR was 2 seconds. This was due to a bug in the software used to convert from DCM to NIfTI. The issue has been corrected in the latest version of the BIDS dataset (see JSON sidecar file for correct TR).

29/3/2019

BIDS Dataset Released

MRI and MEG data have been updated to conform with latest BIDS standards. MRI data has been converted using the dcm2bids package, while MEG data has been converted using the fieldtrip bids converter.

29/3/2019

MEG Head Position Indicators

Note first 30-40s of each MEG run was without continuous Head Position Indicator (cHPI) coils switched on (note this does not affect trial onsets, which always started after cHPI turned on, but does affect resting-state).

03/05/2019

MRI Coil Indicator

In October 2011, after the first 97 CamCAN participants had been acquired, the 3T TRIO was ramped down after the gradient coil failed, and therefore B0 frequency and passive shimming configuration differed for the subsequent participants. The coil-type is now available as a binary variable within the standard tabular data folder provided for all requests.

03/05/2019

fMRI SMT Subjects Removed

Due to a problem with fMRI data acquisition, two subjects were removed from the fMRI SMT dataset (IDs CC610462 and CC220519).

03/05/2019

MEG Subjects Removed

Due to a problem with HPI coils, two subjects were removed from the MEG dataset. For those who already have downloaded data before the above date, IDs CC210314 and CC221733 should be removed from the dataset.

13/06/2019

DWI Subjects Removed

After quality control of the diffusion weighted imaging data, the following subjects' DWI data were removed from the pipeline (CC110033, CC110037, CC110056, CC110101, CC120008, CC120376, CC220901, CC320321, CC320698, CC321880, CC412004, CC420167, CC420435, CC420566, CC510256, CC510434, CC520083, CC620451, CC620567, CC710518, CC710551, CC721052, CC721377).

19/07/2019

Another DWI Subject Removed

After quality control of the diffusion weighted imaging data, the following subjects' DWI data were removed from the pipeline (CC221585).

27/08/2019

Correction of raw MEG BIDS

Owing to a file-naming error, all participants had their raw MEG BIDS files named "proc-sss" - this filename component now removed. Note this only happened to the new BIDS reformatting done on 11/04/2019 (not pseudo-BIDS format released previously).

28/08/2019

Correction of multiple raw BIDS EPI runs

A subset of 33 participants had multiple runs in their raw BIDS EPI directories (for Rest, SMT and Movie tasks) - now removed and replaced with a single file (because only one run per task). Note this only happened to the new BIDS reformatting done on 11/04/2019 (not pseudo-BIDS format released previously).

11/11/2019

Correction of multiple raw BIDS FieldMap runs

A subset of 33 participants had multiple runs in their raw BIDS FieldMap directories (for Rest, SMT and Movie tasks; like for EPI in issue above) - now removed and replaced with three files: sub-CC*_fmap.nii.gz is the phase map, sub-CC*_run-01_fmap.nii.gz is the magnitude map for short TE, and sub-CC*_run-02_fmap.nii.gz is the magnitude map for long TE. Note this only happened to the new BIDS reformatting done on 11/04/2019 (not pseudo-BIDS format released previously).

10/04/2020

Removal of 5 subjects

Five subjects who only had a T1 image were removed from the dataset (CC210174, CC410447, CC610096, CC720330, CC710501)

10/04/2020

Note lack of onset times for sensorimotor fMRI session in 4 subjects

Owing to a stimulus log problem, the onset .tsv files are missing for 4 subjects (CC120065, CC221755, CC410222, CC610146). Note however that event onsets are common across all subjects, bar a random ITI jitter of ~0.5s, so another subject's onsets could be used to analyse these 4 subjects if wished.

10/04/2020

Echoes previously missing for movie fMRI task

Owing to a BIDS conversion problem, images for some echoes for 7 subjects were missing: CC223115, CC310400, CC320379, CC321053, CC410032, CC420720, CC510354. They have now been added.

10/04/2020

Atypical fMRI acquisition parameters for movie task

5 subjects had different voxel resolutions due to acquisition errors. This is correctly noted in BIDS meta-files, but is mentioned in case important. Specifically, the common resolution is 3.00mm x 3.00mm x 4.44mm x 2.47s, but for CC310008, CC410040, CC510115, CC610028, CC710099 are 3.00mm x 3.00mm x 3.85mm x 2.47s.

10/04/2020

DWI data recovered for 3 subjects, but removed for one

DWI data from 4 subjects were previously from aborted runs. Three of these have now been replaced with correct data (CC320321, CC420167, CC420566), but the data from the fourth (CC420435) have now been removed.

19/05/2020

Epi-movie data for CC110037 were a duplicate of CC110033

The raw NII data in BIDS directory for subject CC110037 have now been corrected.