Given the parameters TE: 120 msec, TR: 3000 sec, and a matrix of 192 x 320, what is the calculated voxel size?

• A. 2.00 x 2.00 x 3
• B. 1.98 x 1.19 x 3
• C. 1.00 x 1.00 x 2
• D. 3.00 x 3.00 x 5

Answer: (B)

To determine the voxel size from the provided imaging parameters, we need to consider how voxel dimensions are calculated in magnetic resonance imaging (MRI).

The voxel size can be estimated using the field of view (FOV) and the matrix dimensions. The formula for voxel size is:

[ \text{Voxel Size} = \left( \frac{\text{FOV}_x}{\text{Matrix}_x}, \frac{\text{FOV}_y}{\text{Matrix}_y}, \text{Slice Thickness} \right) ]

1. Field of View (FOV): Although the specific FOV values are not given in the question, typical values can be calculated or assumed within reasonable limits in practice. For instance, if we assume a common FOV in clinical practice, it might span around 240 mm for each axis, depending on the scanner settings.

2. Matrix Sizes: The matrix size is given as 192 x 320. These numbers represent the resolution in terms of pixels (or spatial resolution) along the x and y directions.

Assuming a FOV of 240 mm for both axes:

• Voxel size calculation for the x-direction:

[ \text{Voxel Size}_x =