[vtkusers] World Units

[Matthew Troke]

Could you elaborate a little more on support for units in Slicer? What do
you mean by "built-in"?

Matt

On Tue, Nov 20, 2018 at 10:41 PM Jean-Christophe Fillion-Robin <
jcfr at kitware.com> wrote:

> Hi Gavin,
>
> If you are working with medical data, you could look at 3D slicer (
> https://slicer.org), it leverages VTK and ITK and also has the notion of
> units built-in.
>
> Hth
> Jc
>
> On Tue, Nov 20, 2018, 9:13 AM David Gobbi <david.gobbi at gmail.com wrote:
>
>> Hi Gavin,
>>
>> Using mm for medical image data (with the exception of microscopy) is the
>> most common choice.  I certainly wouldn't recommend using anything else.
>> I've also noticed the need to tweak volume rendering depending on
>> resolution.
>>
>>   David
>>
>>
>> On Tue, Nov 20, 2018 at 8:00 AM Wheeler, Gavin via vtkusers <
>> vtkusers at public.kitware.com> wrote:
>>
>>> We’ve not been using OpenVR directly, but have been using it indirectly
>>> with medical data. We ended up using m as the real world units, and then
>>> scaling loaded medical data by a factor of 1000 to convert from the
>>> commonly used mm, to m. This has worked well, but there are the odd gotchas
>>> when doing this– watch out for things like volume rendering step size which
>>> you may also need to scale.
>>>
>>>
>>>
>>> Gavin Wheeler
>>>
>>>
>>>
>>> *From:* vtkusers <vtkusers-bounces at public.kitware.com> *On Behalf Of *Ken
>>> Martin
>>> *Sent:* 19 November 2018 16:22
>>> *To:* Dave Demarle <dave.demarle at kitware.com>
>>> *Cc:* vtkusers at public.kitware.com
>>> *Subject:* Re: [vtkusers] World Units
>>>
>>>
>>>
>>> Although the OpenVR module does use the notion of a physical to world
>>> transformation to map between meters in the VR room and the world
>>> coordinates.
>>>
>>>
>>>
>>>
>>>
>>> On Mon, Nov 19, 2018 at 9:57 AM David E DeMarle <
>>> dave.demarle at kitware.com> wrote:
>>>
>>> vtk itself is unitless. it is up to the application to keep track of
>>> that.
>>>
>>>
>>>
>>> David E DeMarle
>>> Kitware, Inc.
>>> Principal Engineer
>>> 21 Corporate Drive
>>> Clifton Park, NY 12065-8662
>>> Phone: 518-881-4909
>>>
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-- 
Matthew Troke
Software Engineer
Office: 1-709-701-0239
Email: matthew.troke at avalonholographics.com

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