Add some basic functions into the mitk::image class, similar to the basic functions provided by the itk::image class
e.g. :
SetPixel( itk::IndexType , itk::Pixeltype)
itk::Pixeltype GetPixel( itk::IndexType )
If you need to change some pixels in the image (e.g. see if your calculated indexPoint is at the right place or so), these functions would make it lots easier.
At the moment you need to cast it to an itk image first, before you can change any pixel.