Hi YiQiang,
there was not attachment. In any case, I confirm that the bifurcation vector
corresponding to group 0 is the CCA vector.
What you wrote is correct.
Best,
Luca
On Apr 5, 2013, at 6:32 PM, qiang zeng wrote:
> Hi Luca,
> From the file (as an attachment, vmtk.jpg), the bifurcation angle is the
> differnce between ICA vector and ECA vector projected onto the bifurcation
> plane. and the ICA angle is the difference between ICA vector and bifurcation
> vector (that is CCA vector?) projected onto the bifurcation plane.
>
> the planarity angle is between the out-of-plane of the CCA and ICA vectors.
> Best,
>
> --- 13年4月2日，周二, Luca Antiga <luca.ant...@orobix.com> 写道：
>
> 发件人: Luca Antiga <luca.ant...@orobix.com>
> 主题: Re: [vmtk-users] How to calculate the ICA angle or planarity angle in
> VMTK or Paraview
> 收件人: "qiang zeng" <zengqiang2...@yahoo.com.cn>
> 日期: 2013年4月2日,周二,上午4:45
>
> Hi YiQiang,
>
>
>> 1)what difference are between InPlaneBifurcationVectorAngles and ICA angle?
>
> The InPlaneBifurcationVectorAngles are the angles between the up-normal
> vector and a branch vector projected onto the bifurcation plane.
> The ICA angle is the angle between the ICA and ECA vectors projected onto the
> bifurcation plane. So, by summing the angle between the ICA branch vector and
> the up-normal and the ECA branch vector and the up-normal you get the ICA
> angle. Note: here I wrote "sum" because I'm referring to the angles absolute
> value, but it's really the difference of the signed angles (since the ICA
> branch and the ECA branch are on opposite sides of the bifurcation up-normal,
> so one angle will come out positive and the other negative, by the convention
> used in vmtk).
>
> The reason why we don't spit the ICA angle directly is just our wish to make
> the tool generic and not specific to the carotid bifurcation.
>
>> 2)in the result of the vector (BifurcationVectors,
>> InPlaneBifurcationVectors, OutOfPlaneBifurcationVectors) by VMTK (as an
>> attachment), each part has three groups. and how to get the angle from the
>> vector by VMTK? or do i need to use the other tools (such as Paraview) to
>> caculate the angle value.
>
> You get both vectors and angles. In fact, the InPlaneBifurcationVectorAngles
> are angles in radians, while the InPlaneBifurcationVectors are the vector
> components from which the angle is computed.
>
>> 3)for the ICA angle, i need to get the difference between the two downstream
>> inplane angles. but the InPlaneBifurcationVectors has two downstream groups
>> vector [(--0.27,0.18,2.60), (0.60, -0.50.0.89)] and how to distinguish and
>> control these vectors.
>
> You should look at the InPlaneBifurcationVectorAngles and take the difference
> (see point above) between the angles for group 2 and 3 (which correspond to
> the ICA and ECA - assuming you selected the output target point of the ICA as
> first when extracting centerlines).
>
> So, in your case, ICA = 0.26687 - (- 0.608927) = 0.875797 (in radians) =
> 50.18 (in degrees)
>
> Hope this clarifies it.
>
>
> Luca
>
>
>
> On Mar 29, 2013, at 4:20 PM, qiang zeng wrote:
>
>> Hi Luca,
>> Thank you for your reply.
>> I have already saw the "Computing bifurcation geometry" section. but i have
>> some doubt:
>> 1)what difference are between InPlaneBifurcationVectorAngles and ICA angle?
>> 2)in the result of the vector (BifurcationVectors,
>> InPlaneBifurcationVectors, OutOfPlaneBifurcationVectors) by VMTK (as an
>> attachment), each part has three groups. and how to get the angle from the
>> vector by VMTK? or do i need to use the other tools (such as Paraview) to
>> caculate the angle value.
>> 3)for the ICA angle, i need to get the difference between the two downstream
>> inplane angles. but the InPlaneBifurcationVectors has two downstream groups
>> vector [(--0.27,0.18,2.60), (0.60, -0.50.0.89)] and how to distinguish and
>> control these vectors.
>>
>> Best,
>> YiQiang
>>
>>
>> --- 13年3月29日，周五, Luca Antiga <luca.ant...@gmail.com> 写道：
>>
>> 发件人: Luca Antiga <luca.ant...@gmail.com>
>> 主题: Re: [vmtk-users] How to calculate the ICA angle or planarity angle in
>> VMTK or Paraview
>> 收件人: "qiang zeng" <zengqiang2...@yahoo.com.cn>
>> 抄送: vmtk-users@lists.sourceforge.net
>> 日期: 2013年3月29日,周五,下午9:35
>>
>> Hi YiQiang,
>> the angles you get from vmtk are explained in
>> http://www.vmtk.org/Tutorials/GeometricAnalysis/,
>> "Computing bifurcation geometry" section.
>>
>> The ICA angle is the difference between the two downstream inplane angles,
>> while the planarity angle
>> is the difference between the upstream and downstream out of plane angles.
>>
>> Hope this gives you a hint
>>
>>
>> Luca
>>
>>
>>
>> On Mar 28, 2013, at 9:10 AM, qiang zeng wrote:
>>
>>> Dear VMTK users,
>>> In my works, I need to calculate the ICA angle and planarity angle like the
>>> Stroke 2005 paper. but I didn't get the result from the Paraview.
>>> Does anyone know a way to do this?
>>>
>>> Thanks in advance!
>>> Best wishes,
>>> YiQiang Zeng
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>>
>> <data.jpg>
>
>
>
>
>
>
>
>
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