distance between each voxel and centroid of 3D object

[Kotaro Hiraoka]

Dear users,

Hi, I'm a new user of ImageJ.

I'm now trying to measure the mean of distance between each thresholded
voxel of a 3D object in stacked MRI images and the centroid of the object.
The 3D object is hollow and the number of thresholded voxels is about
400000.
I could determine the (x,y,z) of the centroid using plugin 'Object
Counter3D'.
However, I don't know what to do next.
Would you tell me how to complete the measurement? Is there a plugin
appropriate for the measurement?

Thank you very much in advance.

Kotaro Hiraoka
Department of Behavioral Neurology and Cognitive Neuroscience, Tohoku
University Graduate School of Medicine, Sendai, Japan

[David Webster]

If there is a way to produce a 3D distance map, then you can apply that to a
3D "image" of just the centroids. I don't know if this can be produced
automatically. You may need to write a macro. Check the ImageJ lists of
macros and plugins for the distance transform, You might want to check the
FIJI wiki as well.

David Webster

On Wed, Mar 25, 2009 at 7:12 PM, Kotaro Hiraoka <
[hidden email]> wrote:

> Dear users,
>
> Hi, I'm a new user of ImageJ.
>
> I'm now trying to measure the mean of distance between each thresholded
> voxel of a 3D object in stacked MRI images and the centroid of the object.
> The 3D object is hollow and the number of thresholded voxels is about
> 400000.
> I could determine the (x,y,z) of the centroid using plugin 'Object
> Counter3D'.
> However, I don't know what to do next.
> Would you tell me how to complete the measurement? Is there a plugin
> appropriate for the measurement?
>
> Thank you very much in advance.
>
> Kotaro Hiraoka
> Department of Behavioral Neurology and Cognitive Neuroscience, Tohoku
> University Graduate School of Medicine, Sendai, Japan
>

[Robert Dougherty]

The Local Thickness plugin on my site can produce the 3D distance map,  
AKA EDT.

Bob

On Mar 25, 2009, at 8:45 PM, David Webster wrote:

> If there is a way to produce a 3D distance map, then you can apply  
> that to a
> 3D "image" of just the centroids. I don't know if this can be produced
> automatically. You may need to write a macro. Check the ImageJ lists  
> of
> macros and plugins for the distance transform, You might want to  
> check the
> FIJI wiki as well.
>
> David Webster
>
> On Wed, Mar 25, 2009 at 7:12 PM, Kotaro Hiraoka <
> [hidden email]> wrote:
>
>> Dear users,
>>
>> Hi, I'm a new user of ImageJ.
>>
>> I'm now trying to measure the mean of distance between each  
>> thresholded
>> voxel of a 3D object in stacked MRI images and the centroid of the  
>> object.
>> The 3D object is hollow and the number of thresholded voxels is about
>> 400000.
>> I could determine the (x,y,z) of the centroid using plugin 'Object
>> Counter3D'.
>> However, I don't know what to do next.
>> Would you tell me how to complete the measurement? Is there a plugin
>> appropriate for the measurement?
>>
>> Thank you very much in advance.
>>
>> Kotaro Hiraoka
>> Department of Behavioral Neurology and Cognitive Neuroscience, Tohoku
>> University Graduate School of Medicine, Sendai, Japan
>>

Robert Dougherty, Ph.D.
President, OptiNav, Inc.
4176 148th Ave. NE
Redmond, WA 98052
[phone]
FAX [phone]
www.optinav.com
[hidden email]