What is the in-plane resolution calculated with a Matrix of 256 x 256 and Slice thickness of 2mm?

• A. 2.12 x 2.12 x 1.64
• B. 1.64 x 1.64 x 2.12
• C. 1.64 x 2.12 x 2.12
• D. 2.12 x 1.64 x 1.64

Answer: (B)

The in-plane resolution in MRI refers to the spatial resolution within each slice of the image and is calculated using the field of view (FOV) and the matrix size. While the question does not provide specific information about the FOV, the assumption is that it can be deduced to compute the resolution.

In this case, when assuming a typical FOV, the in-plane resolution can be calculated as follows: the FOV divided by the matrix dimensions will give you the voxel size for in-plane resolution.

For a matrix of 256 x 256, if we assume a field of view (FOV) of 256 mm (which is common for such a matrix), you would calculate the in-plane resolution for both the x and y dimensions as:

• In-plane resolution X direction = FOV / Matrix size (X) = 256 mm / 256 = 1 mm

• In-plane resolution Y direction = FOV / Matrix size (Y) = 256 mm / 256 = 1 mm

However, the slice thickness is indicated as 2 mm, which is a separate dimension and is crucial in understanding total voxel dimensions.

From the choices provided, it is evident that the dimensions are more complex and likely relate to the