Question
Question Posted 10/23/24:
Hi there,
I've downloaded around ~150 fMRI sequences that only appear to have 1 .dcm file, instead of the 1000s expected. For example, /ADNI 5/006_S_4485/Axial_fcMRI__EYES_OPEN_/2019-10-01_11_40_18.0/I1278843
/ADNI 4/012_S_4012/Resting_State_fMRI/2011-11-07_12_22_11.0/I265869
Is there an explanation for this?
Thank you,
Hi there,
I've downloaded around ~150 fMRI sequences that only appear to have 1 .dcm file, instead of the 1000s expected. For example, /ADNI 5/006_S_4485/Axial_fcMRI__EYES_OPEN_/2019-10-01_11_40_18.0/I1278843
/ADNI 4/012_S_4012/Resting_State_fMRI/2011-11-07_12_22_11.0/I265869
Is there an explanation for this?
Thank you,
Response posted 10/23/24 by Rob Reid:
Hello,
The different scanner manufacturers support different versions of DICOM, and Philips has a version ("enhanced") that has only 1 file per series, as opposed to 1 file per slice ("classic") as you are expecting. Siemens has 2 versions (mosaic and enhanced) which give 1 file per volume. Complicating things, enhanced DICOM can be and often is unenhanced en route, so it is hard to predict how it will arrive.
The short answer is that it is probably OK, and certainly OK if it passed QC and was released from quarantine, so give it a try.
The different scanner manufacturers support different versions of DICOM, and Philips has a version ("enhanced") that has only 1 file per series, as opposed to 1 file per slice ("classic") as you are expecting. Siemens has 2 versions (mosaic and enhanced) which give 1 file per volume. Complicating things, enhanced DICOM can be and often is unenhanced en route, so it is hard to predict how it will arrive.
The short answer is that it is probably OK, and certainly OK if it passed QC and was released from quarantine, so give it a try.
