Computed Tomography Technologist Practice Exam 2026 – All-in-One Guide for Exam Success!

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What is the allowable variation for a slice thickness of less than 5mm?

+/- 0.3 mm

+/- 0.5 mm

For a slice thickness of less than 5mm, the acceptable variation is typically considered to be +/- 0.5 mm. This standard aligns with the guidelines established for computed tomography (CT) imaging, which emphasize that for thinner slices, such as those under 5mm, the precision of the thickness is critical for the accuracy of the imaging.

Maintaining this level of precision is essential, as it ensures that the images produced are reliable and consistent, allowing for high-quality outcomes in diagnostic assessments. This variation accommodates the technical limitations of the CT equipment while still ensuring that the images remain clinically useful and diagnostically relevant.

Other variations, such as +/- 0.3 mm or larger variations like +/- 1 mm or +/- 1.5 mm, do not conform to these standards for slice thickness under 5mm, as they would introduce too much potential error which could compromise the quality of the images and lead to inaccuracies in diagnosis.

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+/- 1 mm

+/- 1.5 mm

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