Finally I have got my hands on a second atrium MRA. It is quite different in shape and topology, from the first atrium. It is quite intriguing how such varying shapes of the same organ can occur in nature. The atrium is much larger in shape compared to the previous one, and has thicker PV branches. Such topological variations can make it very difficult to model the shapes using statistical models. One might need to resort to incorporating other techniques that can encode a-priori information, such as probabilisitic atlases.
The MRA data appears to contain a significant amount of noise. I am not entirely certain if this is due to actual noise, or if it's being caused by the rendering algorithm. In the near future, I will be looking more closely into this patient's MRA data and attempt to acquire better images of the segmentation.
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