help
help > RE: slice timing correction
May 19, 2018 05:05 PM | Larry Lai
RE: slice timing correction
Dear Lee
As of acquisition order, please choose Siemens (Interleaved). The CONN will detect it automatically.
• Even number of slices:
slice number 2 first
• Odd number of slices:
slice number 1 first
Example:
• 36 slices: even number of slices
• Order: 2,4,6,8,10,....,
34,36,1,3,5,7,10,....,33,35
• 35 slices: odd number of slices
• Order: 1,3,5,7,10,....,
33,35,2,4,6,8,10,....,32,34
For TR, please enter 2 in the basic setup.
However, you may always use MRIcro to check the total slice number by sliding the bar from the slice viewer on transverse plane.
Cheers
Larry
Originally posted by jeonho lee:
As of acquisition order, please choose Siemens (Interleaved). The CONN will detect it automatically.
• Even number of slices:
slice number 2 first
• Odd number of slices:
slice number 1 first
Example:
• 36 slices: even number of slices
• Order: 2,4,6,8,10,....,
34,36,1,3,5,7,10,....,33,35
• 35 slices: odd number of slices
• Order: 1,3,5,7,10,....,
33,35,2,4,6,8,10,....,32,34
For TR, please enter 2 in the basic setup.
However, you may always use MRIcro to check the total slice number by sliding the bar from the slice viewer on transverse plane.
Cheers
Larry
Originally posted by jeonho lee:
Dear CONN-experts
I want to analyze the resting-state fMRI data obtained by using 3T Siemens Skyra scanner.
The parameters are the following: isovoxel of 2 mm3, TR=2 sec, multiband factor of 3.
After searching for the answer from the online webpages, some researchers recommend that slice timing correction is necessary in cases of TR=2 sec.
During slice time correction, I chose Manually define, and entered acquisition time of each slice(72 slice) obtained through the dcm2niix program.
However, in the preprocessing process, an error occurs repeatedly, and automatically returned as 1,2,3.......91.
Number of slices is... : 91
Time to Repeat (TR) is... : 2
Parameters are specified as... : slice indices
Completed : 11:46:44 - 22/12/2017
Done 'Slice Timing'
Running 'Slice Timing'
I can not understand what 91 means and why this phenomenon appears.
Any suggestion?
My question is very similar to what Larry did in 2017. I could not find the answer to that question and I was asked again.
Thanks for considering my request.
jh lee
I want to analyze the resting-state fMRI data obtained by using 3T Siemens Skyra scanner.
The parameters are the following: isovoxel of 2 mm3, TR=2 sec, multiband factor of 3.
After searching for the answer from the online webpages, some researchers recommend that slice timing correction is necessary in cases of TR=2 sec.
During slice time correction, I chose Manually define, and entered acquisition time of each slice(72 slice) obtained through the dcm2niix program.
However, in the preprocessing process, an error occurs repeatedly, and automatically returned as 1,2,3.......91.
Number of slices is... : 91
Time to Repeat (TR) is... : 2
Parameters are specified as... : slice indices
Completed : 11:46:44 - 22/12/2017
Done 'Slice Timing'
Running 'Slice Timing'
I can not understand what 91 means and why this phenomenon appears.
Any suggestion?
My question is very similar to what Larry did in 2017. I could not find the answer to that question and I was asked again.
Thanks for considering my request.
jh lee
Threaded View
| Title | Author | Date |
|---|---|---|
| jeonho lee | May 19, 2018 | |
| Alfonso Nieto-Castanon | May 24, 2018 | |
| Larry Lai | May 19, 2018 | |
| jeonho lee | May 20, 2018 | |
| Larry Lai | May 20, 2018 | |