What distinguishes helical CT from conventional CT?

Helical CT is characterized by the continuous movement of the x-ray source and the patient through the gantry during the scan, which is a fundamental shift from the traditional step-and-shoot technique of conventional CT. In conventional CT, the x-ray tube rotates around the patient at fixed positions, capturing individual slices of the body. Each slice requires the patient to remain stationary while the x-ray tube shifts to the next predetermined location, introducing gaps in the data acquisition.

In contrast, the helical CT technology allows for a spiral path of data acquisition. The x-ray tube rotates continuously while the patient moves through the opening of the scanner, creating a helical (or spiral) path. This continuous motion leads to several advantages: it enables faster scanning times, eliminates gaps between slices, and facilitates the production of volumetric data, allowing for 3D reconstruction of images. These advancements improve the quality of images and enhance diagnostic capabilities.

The other choices do not accurately reflect the distinctions of helical CT. Helical CT can produce both 2D and 3D images; the use of multiple detectors (rather than just a single detector) is more common in helical systems; and while radiation dose management is a consideration, helical CT does not inherently