Real time evaluation of overranging in helical computed tomography |
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| Affiliation: | 1. Department of Radiology, University of Erlangen, Maximiliansplatz 1, Erlangen, Germany;2. Imaging Sciences Institute (ISI), Ulmenweg 18, Erlangen, Germany;3. Siemens Healthcare, GmbH, CT Division, Siemensstraße 1, Forchheim, Germany;4. Department of Medicine, Pneumology, University of Erlangen, Ulmenweg 18, Erlangen;5. Department of Cardiology, University Hospital Erlangen, Ulmenweg 18, Germany;1. Department of Medical Imaging, Nanjing Jinling Hospital, Southern Medical University (Guangzhou), 305# Eastern Zhongshan Road, Nanjing 210002, China;2. Department of Medical Imaging, Huai’an First People’s Hospital, Nanjing Medical University, 6# Western Beijing Road, Huai’an 223300, China |
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| Abstract: | Overranging or overscanning increases the dose delivered to patients undergoing helical Computed Tomography examinations. In order to reduce it, nowadays most of the multidetector tomographs close the X-ray beam aperture at the scan extremes. This technical innovation, usually referred to as dynamic or adaptive collimation, also influences the overranging assessment methods. In particular, the film free approach proposed in previous studies is not suitable for these modern tomographs. The present study aims to introduce a new method of estimating overranging with real time dosimetry, even suitable for tomographs equipped with adaptive collimation. The approach proposed is very easy to implement and time saving because only a pencil chamber is required. It is also equivalent in precision and in accuracy to the film based one, considered an absolute benchmark. |
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| Keywords: | Computed tomography Overranging Overscanning |
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