[Camino-users] error with subsetscheme

[Philip A Cook]

Hi,

The subsetscheme command helps find the subset data if you have a list of 3D image volumes in a text file, plus the original scheme file, and the subset scheme directions. It won't work with 4D .nii data, sorry.

For subsetpoints, you need to give it just points on the unit sphere. Also, it doesn't recognize multiple shells, so if you are trying to find an even subset of a three shell protocol, you'd need to process each shell separately.

There might be better software out there to subset multishell data - I know several people proposed faster optimization methods for finding subsets since the Camino implementation was first published.


> On Sep 8, 2017, at 11:23 AM, Versace, Amelia <versacea at upmc.edu> wrote:
> 
> Dear camino expert, 
>  
> I am trying to select a fewer number of gradient directions (let’s say 60) from a sequence of 210 gradients (it’s a three-shell sequence) in such a way that all the gradients/points of the subset are equally distributed on the sphere. I came across the function ‘subsetpoints/subsetscheme’ of camino, which seems to do the job.
> Should the b0s (b=5 in my data) stay or be removed before entering subsetpoints?
> Also, when I try running the second step (subsetscheme),  get the following error.  
>  
> subsetscheme -schemefile 198_PA.scheme -imagelist 198_PA.nii -subsetpoints elec198_best40.points -outputroot subset
> Exception in thread "main" java.util.NoSuchElementException
>         at java.util.Scanner.throwFor(Scanner.java:862)
>         at java.util.Scanner.next(Scanner.java:1485)
>         at java.util.Scanner.nextInt(Scanner.java:2117)
>         at java.util.Scanner.nextInt(Scanner.java:2076)
>         at apps.SubsetScheme.execute(SubsetScheme.java:109)
>         at apps.EntryPoint.main(EntryPoint.java:290)
>  
> Any help will be greatly appreciated! 
> Thanks, Amelia
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