questions > (0008, 0013) InstanceCreationTime
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Apr 16, 2020  05:04 PM | Wenwen Li - University of Sheffield
(0008, 0013) InstanceCreationTime
Dear Chris,

Hope you are doing well.

May I ask if you use the DICOM tag (0008, 0013) Instance Creation Time as one of the parameters to convert the CT DICOM data to NIFTI in dcm2niix? This tag is for recording the generation time of each specific slice in a CT scan.

Best wishes,
Wenwen
Apr 16, 2020  05:04 PM | Chris Rorden
RE: (0008, 0013) InstanceCreationTime
dcm2niix looks at the following time tags:

StudyTime (0008,0030)
SeriesTime (0008,0031)
AcquisitionTime (0008,0032)

for MRI, Instance Creation Time 0008,0013 initially reflects the time an image leaves a parallel processing reconstructor, so it has a variable delay with regards to the acquisition time. Acquisition Time is more meaningful for data.

Further, Instance Creation can be updated when the image is modified, for example a tool that anonymizes the data or changes the transfer syntax might update this. 

Here is an example of an image that was acquired in 2019 but the transfer syntax updated in 2020:

(0008,0012) DA [20200402] # 8,1 Instance Creation Date
(0008,0013) TM [110335.114402 ] # 14,1 Instance Creation Time
....
(0008,002a) DT [20191119185214.940000 ] # 22,1 Acquisition DateTime
(0008,0030) TM [180511.400000 ] # 14,1 Study Time
(0008,0031) TM [185538.253000 ] # 14,1 Series Time
(0008,0032) TM [185214.940000 ] # 14,1 Acquisition Time
Apr 16, 2020  07:04 PM | Wenwen Li - University of Sheffield
RE: (0008, 0013) InstanceCreationTime
Thank you very much, Chris. That's very helpful!

Best wishes,
Wenwen

Originally posted by Chris Rorden:
dcm2niix looks at the following time tags:

StudyTime (0008,0030)
SeriesTime (0008,0031)
AcquisitionTime (0008,0032)

for MRI, Instance Creation Time 0008,0013 initially reflects the time an image leaves a parallel processing reconstructor, so it has a variable delay with regards to the acquisition time. Acquisition Time is more meaningful for data.

Further, Instance Creation can be updated when the image is modified, for example a tool that anonymizes the data or changes the transfer syntax might update this. 

Here is an example of an image that was acquired in 2019 but the transfer syntax updated in 2020:

(0008,0012) DA [20200402] # 8,1 Instance Creation Date
(0008,0013) TM [110335.114402 ] # 14,1 Instance Creation Time
....
(0008,002a) DT [20191119185214.940000 ] # 22,1 Acquisition DateTime
(0008,0030) TM [180511.400000 ] # 14,1 Study Time
(0008,0031) TM [185538.253000 ] # 14,1 Series Time
(0008,0032) TM [185214.940000 ] # 14,1 Acquisition Time