fMRI divides up the brain into voxels, the smallest measurement units. Typically, the size of these voxels for 3T fMRI is approximately:

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To start, consider what fMRI voxel size means: it is the 3D volume element that the imaging data represents, roughly reflecting the spatial resolution of the scan. 
Option a) suggests 0.3 x 0.3 mm2, which is an area in square millimeters and also far smaller than typical voxel dimensions; fMRI data are not captured at sub-millimeter two-dimensional areas as voxel units. This makes the option unrealistic for standard 3T voxel sizing.
Option b) gives 0.3 x 0.3 x 0.3 mm3, a true cubic millimeter size of 0.027 mm3 per voxel. While this is a mathematically valid voxel, it is far finer than what standard 3T fMRI protocols achieve; typical whole-brain coverage at 3T uses coarser voxels due to signal-to-noise and acquisition time constraints.
Option c) lists 3 x 3 mm2, which is a common in-plane resolution but lacks depth dimension; it describes an area rather than a volume. Since voxels are 3D units, omitting the third dimension makes this description incomplete and thus inaccurate for defining voxel size.
Option d) states 3 x 3 x 3 mm3, a standard voxel dimension used in many 3T fMRI protocols, representing a cubic millimeter volume that aligns with conventional spatial resolution (roughly 27 mm3 per voxel). This properly reflects the typical size across all three dimensions in standard practice.
In summary, the incorrect choices either misrepresent voxel shape (area only), propose an unrealistically small volume given typical 3T constraints, or omit one spatial dimension, whereas option d correctly captures the conventional 3D voxel size used in 3T fMRI data.

PSYC20006_2025_SM1 Exam: Biological Psychology (PSYC20006_2025_SM1)- Requires Respondus LockDown Browser

fMRI divides up the brain into voxels, the smallest measurement units. Typically, the size of these voxels for 3T fMRI is approximately:

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