[Camino-users] TEND stepsize

[Peter Neher]

So do you proceed along the streamline with a fixed step size, or do you 
somehow calculate the point where the streamline is leaving/entering a 
voxel explicitely in order to find the point where to apply the new 
direction?

Best,
Peter

On 07/11/2012 10:26 PM, Philip A Cook wrote:
> Hi,
>
> You're right, if deflection is computed at every step it certainly would make the results dependent on step size. In Camino, the tend implementation extends FACT, and hence the tensor deflection only gets applied once per voxel. I'm working on a more general tracking framework that would let you use TEND in other algorithms. In that case you would want to reduce the weight the TEND term if you used smaller step sizes.
>
>
> On Jul 11, 2012, at 10:21 AM, Peter Neher wrote:
>
>> Hi all,
>>
>> I have another question. I was wondering how the stepsize of the streamline tracking methods is determined if the -stepsize parameter only affects the interpolated case. I guess for FACT it does not matter but the tensor deflection is influenced drastically by the step size. Or is the deflection D*v only applied once per voxel and not at every step?
>>
>> Best,
>> Peter
>> -- 
>> Dipl.-Inform. Peter Neher
>> German Cancer Research Centre
>> (DKFZ, Deutsches Krebsforschungszentrum in der Helmholtz-Gemeinschaft, Stiftung des öffentlichen Rechts)
>> Division of Medical and Biological Informatics
>> Im Neuenheimer Feld 280, D-69120 Heidelberg
>>
>> Phone: 49-(0)6221-42-3552, Fax: 49-(0)6221-42-2345
>> E-Mail:
>> p.neher at dkfz-heidelberg.de, Web: www.dkfz.de
>>
>>
>> The information contained in this message may be confidential and legally protected under applicable law. The message is intended solely for the addressee(s). If you are not the intended recipient, you are hereby notified that any use, forwarding, dissemination, or reproduction of this message is strictly prohibited and may be unlawful. If you are not the intended recipient, please contact the sender by return e-mail and destroy all copies of the original message.
>>
>> _______________________________________________
>> Camino-users mailing list
>> Camino-users at www.nitrc.org
>> http://www.nitrc.org/mailman/listinfo/camino-users

-- 
Dipl.-Inform. Peter Neher
German Cancer Research Centre
(DKFZ, Deutsches Krebsforschungszentrum in der Helmholtz-Gemeinschaft, Stiftung des öffentlichen Rechts)
Division of Medical and Biological Informatics
Im Neuenheimer Feld 280, D-69120 Heidelberg

Phone: 49-(0)6221-42-3552, Fax: 49-(0)6221-42-2345
E-Mail: p.neher at dkfz-heidelberg.de, Web: www.dkfz.de

The information contained in this message may be confidential and legally protected under applicable law. The message is intended solely for the addressee(s). If you are not the intended recipient, you are hereby notified that any use, forwarding, dissemination, or reproduction of this message is strictly prohibited and may be unlawful. If you are not the intended recipient, please contact the sender by return e-mail and destroy all copies of the original message.