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Hello, I have an MRI sample collected on a Siemens Magnetom Spectra 3T scanner. However, we do not place any pointing devices inside the scanner to indicate which side is the right and which is the left. I was wondering how the images were acquired - from the front of the individuals, meaning that the left in the image is the right in the patient? Or otherwise? When processing the T1-weighted images on Freesurfer, I also have a doubt... the DICOM images are synchronized? Left in DICOM is left in the patient? And after freesurfer preprocessing? It flips the images or not?
Thank you very much!
This information is extracted out of the dicom header, so as long as you are converting directly from dicom, the information will be correct. You can run mri_info orig.mgz and it will print out a lot of information, including the orientation string. Eg, RAS means that the fastest (column) dimension increases to the right. When you look at a volume in freeview, you will see coordinates in the control window. These will be RAS
On 7/17/20 7:45 PM, Cibele Bandeira wrote:
External Email - Use Caution
Hello, I have an MRI sample collected on a Siemens Magnetom Spectra 3T scanner. However, we do not place any pointing devices inside the scanner to indicate which side is the right and which is the left. I was wondering how the images were acquired - from the front of the individuals, meaning that the left in the image is the right in the patient? Or otherwise? When processing the T1-weighted images on Freesurfer, I also have a doubt... the DICOM images are synchronized? Left in DICOM is left in the patient? And after freesurfer preprocessing? It flips the images or not?
Thank you very much!
*Cibele Edom Bandeira* Doutoranda em Genética e Biologia Molecular (PPGBM) Universidade Federal do Rio Grande do Sul (UFRGS)
Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
freesurfer@nmr.mgh.harvard.edu
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Cibele Bandeira -
Douglas Greve