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Hi T,

Ahh, I did indeed misunderstand you.

While we've certainly viewed angio data in ImageVis, I don't think I have any
angio-specific advice.

If you can (i.e. you're on nvidia hardware), I recommend switching on
'advanced' mode in the settings and using the grid leaper or at least the ray
caster, and then cranking up the sampling rate (slider in 'rendering
options'). You might even try upsampling your dataset 2x per dimension by
simply duplicating values. All of these should help you in picking up
extremely small or thin structures, which (IMGO) is usually the main problem
in angio data.

That said, if your data are "good"---they have low noise or you account for
the noise before importing into IV3D---then your best bet is going to be the
2D transfer function editor.

HTH,

-tom

On April 5, 2015 4:16:41 AM EDT, IVALA - Taimur Alavi - Director
< >
wrote:
>Hi Tom,
>
>Thanks for the response. Reading back I actually didn't make myself
>very
>clear. I use the vascular modelling toolkit for segmentation purposes.
>What
>I was hoping to find in ImageVis was a good volume rendering solution
>for
>looking at angiography data. That way if I can have an good/ accurate
>volume rendered result I can then ensure that I'm not missing anything
>on
>my actual segmentation. Slicers volume rendering is good but I haven't
>been
>able to get it to pick up any of the smaller branches.
>
>Whilst I've had a play around with some angio data and the graphs in
>ImageVis, I was wondering whether you had any tips for getting a nice
>volume render of angiography data?
>
>Best,
>T
>
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>
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>
>On 5 April 2015 at 07:17, tom (mobile)
>< >
> wrote:
>
>> Hi, sorry for the slow reply.
>>
>> I'm afraid ImageVis doesn't have any segmentation capabilities. You
>can
>> use the volume expressions / combinations to filter a volume with a
>> segmentation that you have, though.
>>
>> But what you probably want is to just try out Seg3D, the SCI
>Institute's
>> tool for segmentation. It has some semi-automatic methods you may
>find
>> useful.
>>
>> HTH,
>>
>> -tom
>>
>> On April 3, 2015 10:49:28 AM GMT+02:00,
>>
>> wrote:
>> >Hi there ImageVis users
>> >
>> >I currently use Slicer and VMTK.
>> >
>> >- At the moment have a project segmenting large numbers of
>abdominal
>> >aortic
>> >aneurysms
>> >- this is performed on CT angio data
>> >- it's important that I accurately segment any main branches from
>the
>> >aorta,
>> >and the early/proximal branches of these main branches
>> >
>> >Currently I perform some volume rendering in Slicer, and threshold
>out
>> >a model
>> >to get a rough idea of the vessels that're present prior to
>performing
>> >the
>> >segmentation in VMTK. However more often than not neither of these
>> >methods
>> >show the small branches or early branches, so I'm left going through
>> >the CT
>> >slice-by-slice, carefully looking for vessels this way.
>> >
>> >I was hoping that ImagVis may have improved volume rendering
>> >capabilities for
>> >this sort of work. Is anyone able to advise if this is likely to be
>the
>> >case,
>> >and offer some tips for this?
>> >
>> >Hope to hear,
>> >T
>>
>>

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• [IV3D-USERS] CT angiography volume rendering, ivaladesign, 04/03/2015
  • Re: [IV3D-USERS] CT angiography volume rendering, tom (mobile), 04/05/2015
    • Message not available
      • Re: [IV3D-USERS] CT angiography volume rendering, tom (mobile), 04/05/2015

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