American Board of Orthodontics (ABO) Practice Exam 2026 - Free Orthodontics Practice Questions and Study Guide

The correct answer reflects the typical spatial resolution that is derived from the voxel sizes provided. Voxel sizes of 0.3 mm and 0.4 mm indicate the three-dimensional extent of each volume element in the imaging modality being discussed, such as in a CT or MRI scan.

Spatial resolution is typically defined as the ability of an imaging system to distinguish small details and is often expressed in terms of the smallest feature that can be resolved. When voxel sizes are 0.3 mm and 0.4 mm, the effective spatial resolution would be slightly larger than the voxel size due to factors such as reconstruction techniques and the inherent capabilities of imaging equipment.

In this case, approximately averaging these two voxel sizes gives a rough estimate around 0.35 mm. The typical rule is that the spatial resolution, rounded to commonly used clinical figures, would be reflected as approximately 0.5 mm. However, given the options presented, a value of 0.7 mm is selected as the appropriate representation of spatial resolution taking into account statistical averaging and practical application in real-world imaging situations.

The understanding of how voxel size correlates to spatial resolution is crucial in determining the quality and clarity of images used in orthodontics and other fields, ensuring practitioners can