Computed Tomography Technologist Practice Exam 2025 – All-in-One Guide for Exam Success!

The equation for the Dose-Length Product (DLP) in computed tomography is defined as the product of the volume computed tomography dose index (CTDIvol) and the length of the scan. This relationship reflects the concept that DLP provides a measure of the total radiation dose received by a patient during a scan, taking into account both the dose per unit length of tissue exposed (CTDIvol) and the length of the area being scanned. Since DLP is calculated over a specific scan length, multiplying CTDIvol by the length gives a comprehensive assessment of the dose across the entire region scanned. This information is crucial for evaluating patient safety and ensuring minimal exposure while obtaining the necessary diagnostic information.

The other choices do not correctly represent the relationship needed to calculate DLP. For instance, adding, dividing, or subtracting CTDIvol from the scan length does not provide a meaningful metric related to radiation dose in the context of CT imaging. Therefore, understanding this multiplication is key to grasping how dose assessments are quantified in CT practices.