Which computed tomography (CT) scanning technique allows data collection while the patient table is moving?

Helical scanning, also known as spiral scanning, is a CT scanning technique where data collection occurs continuously as the patient table moves through the scanner. This method involves the simultaneous rotation of the X-ray tube and the movement of the patient table, resulting in a spiral or helical path of data acquisition. This continuous movement allows for the capture of a volumetric dataset of the scanned area, which can be reconstructed into various imaging formats.

The advantage of helical scanning includes improved scan speed and the ability to produce high-quality images with less motion artifact, as well as the capability of reconstructing images in multiple planes. This technique is particularly beneficial for imaging areas where time is critical, such as in emergency situations.

In contrast, axial scanning acquires data one slice at a time with the patient table remaining stationary between each rotation of the X-ray tube, making it less efficient for acquiring data in a shorter time frame. Volume scanning, while similar to helical scanning, emphasizes the acquisition of volumetric data but does not specifically depict the continuous movement aspect. Sequential scanning, like axial scanning, processes slices individually without the continuous data acquisition necessary for helical scanning.