Computed Tomography Technologist Practice Exam 2025 - Free CT Technologist Practice Questions and Study Guide

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What is affected when using a larger slice thickness in CT imaging?

Increased contrast resolution

Spatial resolution

When utilizing a larger slice thickness in CT imaging, spatial resolution is significantly affected. Spatial resolution refers to the smallest object that can be distinctly imaged. By increasing the slice thickness, there is often a reduction in spatial resolution because thicker slices can blend or average the signal from multiple adjacent voxels, making it harder to discern fine details. This can result in a loss of clarity in the imaging, especially in areas where precision is critical, such as in the evaluation of small lesions or structures.

Other options may see some influence as well, but they do not directly relate to the primary effect of increasing slice thickness. For example, while a larger slice thickness can lead to increased image noise, the predominant impact lies in the reduction of spatial resolution, which is crucial for accurate diagnosis and assessment in CT imaging.

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Radiation dose

Image noise

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