[vtkusers] How to use vtkImageReslice to get oblique slice with arbitrarily position and direction

[Alessandro Volz]

Hi,

I just spent a few days figuring out how to do just that :)

In my case, the input is a three-dimensional floats blob (a 3D volume) and the output is a two-dimensional floats blob (a 2D slice that I later draw).

1- map your input data to VTK: I'm using an instance of vtkImageImport, but there are many alternatives depending on your input data
2- set up a vtkImageReslice
3- Update() the vtkImageReslice and get the output vtkImageData through GetOutput()

The tricky part is setting up the vtkImageReslice:

2a- connect the vtkImageImport output to the vtkImageReslice input
2b- set up the output (scalar type, dimensionality, extent, origin, interpolation mode)
2c- define the reslice axes and origin

Your question was mainly on how to define the position and direction of the reslice, so more details on 2c: I ended up setting these on my reslices is by using the vtkImageReslice SetResliceAxes method, basically through an array of 16 values: { xdir.x, ydir.x, zdir.x, origin.x, xdir.y, ydir.y, zdir.y, origin.y, xdir.z, ydir.z, zdir.z, origin.z, 0, 0, 0, 1 }

My Obj-C++ code could be useful: https://github.com/spalte/Natural-Image-Building-Blocks/blob/master/NIBuildingBlocks/NIVTKObliqueSliceOperation.mm

Best,

Alessandro Volz

> On Jan 5, 2017, at 10:55 AM, wangtaoiz <wangtao_ at sjtu.edu.cn> wrote:
> 
> Dear all
> Dose any body know how to use vtkImageReslice to get oblique slice with
> arbitrarily position and direction? I need to set the position and direction
> for reslice, and get the slice data, any good idea?
> 
> Tao Wang
> Thanks all
> 
> 
> 
> 
> --
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