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I have two questions:

  1. What is the difference between 2D and 3D medical images?

  2. Assume I have a 2D image and for example it contains 1000 ROIs. Each ROI is a matrix and we can convert it to a vector.

    When we have a 3D image how can I divide it to ROIs (what will be ROIs) and how can I convert every ROI to a vector?

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I assuming that by ROI you mean an axis-aligned Region of Interest, with some 2D origin and width+height.
In this case, in a 3D volume, a ROI would by an axis aligned box with some 3D origin and a width, height and depth.

Once you have the box you can write out the voxel values inside it as a vector.

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  • $\begingroup$ my database includes 700 lung images with size 512*512*3 in matlab and for a 3D lung image of one person,i confused,what is the relation between those 700 images and a 3D image and how i can extract a voxel from them? $\endgroup$ – Alireza Esmailzehi Apr 29 '15 at 11:46
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    $\begingroup$ What do you mean by 3D image? $\endgroup$ – Adi Shavit Apr 29 '15 at 11:48
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    $\begingroup$ @Alireza Esmailzehi It seems to me that you do not fully understand your data. What kind of data is it (MRI, CT, ...)? I find it unlikely that you have true 3D datasets with only 3 images in the third dimension (maybe you have 3 2D images, or you have one 2D image and 2 parameter maps that are calculated from the same spatial domain by other means of measurement?) $\endgroup$ – M529 Mar 8 '16 at 19:53

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