Spiral<unk>  Drawing of<unk>  fan beam and patient in a<unk>  imaging system Spinning tube, commonly called spiral<unk> , or helical<unk> , 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<unk>  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. Electron beam tomography Electron beam tomography (EBT) is a specific form of<unk>  in which a large enough X-ray tube is constructed so that only the path of the electrons, travelling between the cathode and anode of the X-ray tube, are spun using deflection coils. This type had a major advantage since sweep speeds can be much faster, allowing for less blurry imaging of moving structures, such as the heart and arteries. Fewer scanners of this design have been produced when compared with spinning tube types, mainly due to the higher cost associated with building a much larger X-ray tube and detector array and limited anatomical coverage. Dual source<unk>  Dual source<unk>  is an advanced scanner with a two X-ray tube detector system, unlike conventional single tube systems. These two detector systems are mounted on a single gantry at 90° in the same plane.<unk>  perfusion imaging<unk>  perfusion imaging is a specific form of<unk>  to assess flow through blood vessels whilst injecting a contrast agent. Blood flow, blood transit time, and organ blood volume, can all be calculated with reasonable sensitivity and specificity. This type of<unk>  may be used on the heart, although sensitivity and specificity for detecting abnormalities are still lower than for other forms of<unk> . This may also be used on the brain, where<unk>  perfusion imaging can often detect poor brain perfusion well before it is detected using a conventional spiral<unk> . This is better for stroke diagnosis than other<unk>  types.
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