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=== Spiral CT ===
[[File:Drawing of CT fan beam (left) and patient in a CT imaging system.gif|thumb|Drawing of CT fan beam and patient in a CT imaging system]]
[[File:Axial plane CT scan of the thorax illustrative image.jpg|thumb|CT scan of the thorax. The axial slice (right) is the image that corresponds to number 2/33 on the coronal slice (left).]]
Spinning tube, commonly called [[Spiral computed tomography|spiral CT]], or helical CT, is an imaging technique in which an entire [[X-ray tube]] is spun around the central axis of the area being scanned. These are the dominant type of scanners on the market because they have been manufactured longer and offer a lower cost of production and purchase. The main limitation of this type of CT is the bulk and inertia of the equipment (X-ray tube assembly and detector array on the opposite side of the circle) which limits the speed at which the equipment can spin. Some designs use two X-ray sources and detector arrays offset by an angle, as a technique to improve temporal resolution.<ref>{{Cite book |last1=Fishman |first1=Elliot K. |url=https://books.google.com/books?id=aWlrAAAAMAAJ&q=spiral+ct |title=Spiral CT: Principles, Techniques, and Clinical Applications |last2=Jeffrey |first2=R. Brooke |date=1995 |publisher=Raven Press |isbn=978-0-7817-0218-8 |language=en}}</ref><ref>{{Cite book |last=Hsieh |first=Jiang |url=https://books.google.com/books?id=JX__lLLXFHkC&q=spiral+ct&pg=PA265 |title=Computed Tomography: Principles, Design, Artifacts, and Recent Advances |date=2003 |publisher=SPIE Press |isbn=978-0-8194-4425-7 |page=265 |language=en}}</ref>
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