Which statement is true regarding helical scanning?

Helical scanning, also known as spiral CT scanning, allows for continuous data acquisition as the patient moves through the scanner. This method enables the collection of volumetric data rather than discrete slices, which leads to improved image quality and reduced motion artifacts. The continuous nature of helical scanning decreases the likelihood of blurring caused by patient movement during the acquisition period.

The other statements do not reflect the key features of helical scanning. For instance, helical scanning typically has a shorter scan time than axial scanning due to its ability to collect data continuously. Additionally, it employs a rotating tube that constantly gathers data throughout the patient's movement rather than just a single rotation, providing a more comprehensive dataset. Finally, helical scanning is often beneficial for dynamic studies, such as those involving contrast-enhanced imaging, where rapid data acquisition is essential to capture changes over time.