Today, almost all CT scanners are
helical CT. Different from previous conventional CT machines, a helical CT has x-ray source and detectors which are continuously rotate in a ring. The patient table slides the patient through the source-detector ring. The path of source and detector, respect to the patient, is a
helix. And some people call it spiral CT .
The major improvement of helical CT, compared to old CT, is the rapid volumetric data acquisition. Later, the speed was further increased by
multislice CT, which has a "thick" fan-beam and multiple parallel rows of detectors, typically, 16-slices or 64-slices.
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