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

A multiphasic injection in computed tomography refers to the technique of administering contrast material at varying flow rates to optimize imaging quality. This approach allows for the creation of different phases of enhancement within the tissue being examined, enabling more detailed and diagnostic images. The use of multiple flow rates means that the contrast agent can be administered in a way that highlights different vascular structures or differentiating tissue characteristics at various time intervals as the contrast agent circulates.

By employing more than two flow rates, this method helps capture dynamic changes within the body as the contrast moves through the vasculature and into the surrounding tissues, improving the visualization of pathology, lesions, or other structures. This technique is particularly useful in studying organs with complex vascular patterns, such as the liver or kidneys.

Other methods, like injecting a single flow rate or using multiple contrast agents simultaneously, do not provide the same level of detailed temporal resolution in imaging. Additionally, measuring radiation exposure, while important for patient safety and diagnostic practices, does not relate directly to the concept of multiphasic injections. Therefore, the emphasis on using more than two flow rates for optimal contrast delivery clarifies why this choice is the most accurate representation of a multiphasic injection in CT.