It is quite a tedious process to segment the left atrium from an MRI, interactively, using a recursive-region growing segmentation algorithm. Small changes in threshold levels causes a major change in the segmented volume. The segmentation is performed within a region of interest (a user-defined cuboid). This ROI is the volume within which the human user thinks is where the left atrium is expected to lie by looking at the MRI.
I totally quite yet dont understand if we can assume whether the blood has filled the entire left atrium, in the post-angiograph. I suspect, frm initial segmentation results, that there could be parts where the blood hasnt completely reached the left atrium. However, this is total image acquisition issue. But a burning question, when is a post-angiograph taken? I can definitely confirm that I have seen post-angiographs where the radiocontrast-agent hasn't yet reached the left atrium. But I wonder, why is that the case? Shouldnt post-angiographs be taken when the patient has a complete circulation of radio-constrasting agent blood?
Following is what would be, my dream segmentation of the left atrium:
As you can see, the number of branches of the PV drainage branching out of this atrium is what makes our lives difficult, and thus giving people like us the opportunity to do a PhD.
I totally quite yet dont understand if we can assume whether the blood has filled the entire left atrium, in the post-angiograph. I suspect, frm initial segmentation results, that there could be parts where the blood hasnt completely reached the left atrium. However, this is total image acquisition issue. But a burning question, when is a post-angiograph taken? I can definitely confirm that I have seen post-angiographs where the radiocontrast-agent hasn't yet reached the left atrium. But I wonder, why is that the case? Shouldnt post-angiographs be taken when the patient has a complete circulation of radio-constrasting agent blood?
Following is what would be, my dream segmentation of the left atrium:
As you can see, the number of branches of the PV drainage branching out of this atrium is what makes our lives difficult, and thus giving people like us the opportunity to do a PhD.
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