Re: [Teem-users] Tend Fiber

[Gordon L. K. <gl...@uc...>]

Understanding the software options may not be the best way to  
understand the general problem of termination criteria for  
tractography.  The options available in Teem are probably more general  
than what is described in any given tractography paper.  You could  
start by reading papers or book chapters about tractography, and  
seeing if the termination criteria described are among those supported.

The list in ten.h does have some documentation:

   tenFiberStopAniso,       /*  1: specified aniso got below specified  
level */
   tenFiberStopLength,      /*  2: fiber length in world space got too  
long */
   tenFiberStopNumSteps,    /*  3: took too many steps along fiber */
   tenFiberStopConfidence,  /*  4: tensor "confidence" value went too  
low */
   tenFiberStopRadius,      /*  5: radius of curvature got too small */
   tenFiberStopBounds,      /*  6: fiber position stepped outside  
volume */
   tenFiberStopFraction,    /*  7: during multi-tensor tracking,  
fractional
                                   constituency of the tracked tensor  
got
                                   too small */
   tenFiberStopStub,        /*  8: treat single vertex fibers as non- 
starters */
   tenFiberStopMinLength,   /*  9: fibers with total (both halves)  
small length
                                   are discarded */
   tenFiberStopMinNumSteps, /* 10: fibers with total (both halves)  
small # steps
                                   are discarded (more general-purpose  
than
                                   tenFiberStopStub) */

"Confidence" is the first of the seven values stored per tensor in  
ten's tensor array layout; it can be used to store something like a  
binary mask to represent the confidence in the estimated tensor  
values. tenFiberStopFraction is not relevant to standard tensor-based  
tractography.  The  tenFiberStopStub, tenFiberStopMinLength, and  
tenFiberStopMinNumSteps are not termination criteria exactly, but path  
rejection criteria in the context of tenFiberMultiTrace().

As is often the case, the source is the most reliable source of  
information.

Gordon

On Oct 19, 2010, at 4:45 PM, Sanket Jain wrote:

> Hello Folks,
>
> I recently got started working with Tend Fiber module in SCIRun  
> which uses the tend fiber function from teem library. I am new to  
> the field of tractography and hence would like to understand the  
> different options which come with tend fiber function (stopping  
> criterias). Does anyone know any good reference to understand the  
> different options.
>
> Any help will be greatly appreciated,
>
> Thanks,
>
> Sanket
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