Computed Tomography Technologist Practice Exam

Question: 1 / 615

What happens to the uniformity of the dose as the SFOV and patient size increases?

It remains constant

It decreases

As the size of the scan field of view (SFOV) and the patient size increase, the uniformity of the dose generally decreases. This occurs due to the fact that larger areas require greater exposure to achieve adequate imaging quality, which can lead to variations in dose distribution across the area being scanned.

When the SFOV is expanded to accommodate larger patients or areas, the radiation beam may not distribute evenly throughout. This can result in parts of the area receiving either too much or too little radiation, negatively impacting the uniformity of the dose. Additionally, factors such as beam geometry and tissue density variations in larger patients can further contribute to this lack of uniformity.

Overall, understanding these dynamics of dose distribution is essential for optimizing image quality while maintaining patient safety in CT imaging.

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It increases

It fluctuates

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