Context
This article provides an overview of the fields related to lattice size representation: Lattice Info, Voxel Size, and Physical Size.
The following information applies to data represented in uniform coordinates, where all voxels are of equal size. If your dataset does not fall into this category (for example, stacked, rectilinear, or curvilinear coordinates), the displayed attributes will differ accordingly.
Description
1. Lattice Info
Lattice Info corresponds to the number of voxels used to represent the dataset.
For example, the small data below is visualized with individual voxels outlines to illustrate the voxel structure:
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For example, the small data below is visualized with individual voxels outlines to illustrate the voxel structure:
2. Voxel Size
Voxel Size is typically read directly from the dataset, provided that it was saved as metadata by the acquisition tool or previous software.
If this information is not available, the application will prompt you to specify the size upon loading the data — either as voxel size or physical size.
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If this information is not available, the application will prompt you to specify the size upon loading the data — either as voxel size or physical size.
3. Physical Size
Physical Size corresponds, for each axis, to the following formula: (number of voxels – 1) * voxel size.
In the example above, we get the following size on the X-axis: (23 – 1) * 0.00122609 = 0.0269739.
The “-1” to the dimensions here represents the fact that the center of each voxel is used for size calculation rather than the voxel boundaries.
As such, on the data’s boundaries, half a voxel is not counted as being part of the data’s size.
The second tuple of numbers corresponds to the origin (in global coordinates) from which the data is positioned within the application.
If the data is translated, these numbers will update accordingly.
- You can modify the physical size or voxel size of your dataset using the Crop Editor:
- Although the actual unit of measurement is arbitrary and not displayed, you can view the internal unit used by the application in the Data Parameter Editor:
- If you prefer to work with explicitly displayed units (for instance, in Label Analysis), you can enable this option under Edit -> Preferences -> Units.