Recently I have downloaded REST as well as DPRASF soft ware and using for fMRI analysis. I am learning functinal connectivity analysis by using these software. I have dwnloaded a data set from ADHD 200 datasets. There are totally 48 fMRI and sMRI datasets. Since first time I am doing this analysis I have taken only one fMRI (single subject) and converted it into Nifty pairs (img/hdr) by using REST utility.
I entered all there parametrs in the DPARSF (Basic) except time ponit. I would like to know how to define timepoint for this single data. Herewith I have attached the scan parameters also. NAy help will be appreciated.
Hi, the time points of the fMRI data, is How many images you collected for an individual data in a fMRI scan.
Suppose you have a 6min fMRI scan, the TR is 2s, that means in every 2s, you collect 1 image of the whole brain.
So, totally, 6min = 6*60s=6*60/2 = 180 time points.
Thank you very much for your reply. Since it is downloaded dataset, I don't know the total time duration. I have attched the scan parameter. I would know how to calculate the total time duarion from the given different parameters. Please let me know.
see a parameter named "measurement", it is 266, so the time points should be 266.
Still I am findimg difficault. DPARSF is not considering the time point 266. I am just stuck up basic level itself. Please provide me some solution.
if you still stuck up, try leave the field empty, don't enter any number in.
Thank you ery much for ypur reply.
I would like to know how to calculate sample size for a study on meditation. This meditation has 4 stages. I would like to run ti as 4 sessions. For each session the time duaration may vary. But total time duration will about 20 minutes.
I dont have any pilot data.
if you want to run it like 4 sessions, you can calculate the sample size (if you meaned sample size = how many TRs in each session) by calculating how many dicom files in each session. Basically there are two possibilities: num of dicom files = sample size * number of slices in each volume, the other is num of dicom files = sample size. But you have to know which images belong to which session first.