Helical body CT: evolution of scanning protocols.
نویسندگان
چکیده
منابع مشابه
Optimisation of whole-body PET/CT scanning protocols
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Images generated with helical scanning are degraded by partial volume artifacts caused by an increased slice thickness when compared to conventional computed tomography (CT) scanning. The slice thickness for a helical scan is proportional to the sum of the thickness of the fan of radiation and the distance the patient moves during data acquisition. We present a method called moving beam helical...
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Since the introduction of clinical CT great improvements in scan time, patient comfort and resolution have been made. The first clinical CT scanner dates from 1972 and was developed by Godfrey Hounsfield. It required an acquisition time of 5 minutes and reconstruction of one image took 7 minutes . In the following years CT systems improved rapidly and by 1976 acquisition time for one CT image h...
متن کاملMultislice CT of the head and body routine scans: Are scanning protocols adjusted for paediatric patients?
PURPOSE To investigate whether the multislice CT scanning protocols of head, chest and abdomen are adjusted according to patient's age in paediatric patients. MATERIALS AND METHODS Multislice CT examination records of paediatric patients undergoing head, chest and abdomen scans from three public hospitals during a one-year period were retrospectively reviewed. Patients were categorised into t...
متن کامل[Examination of motion artifacts for helical and non-helical scanning modes in head CT].
For head computed tomography (CT), non-helical scanning has been recommended even in the widely used multi-slice CT (MSCT). Also, an acute stroke imaging standardization group has recommended the non-helical mode in Japan. However, no detailed comparison has been reported for current MSCT with more than 16 slices. In this study, we compared the non-helical and helical modes for head CT, focusin...
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ژورنال
عنوان ژورنال: American Journal of Roentgenology
سال: 1998
ISSN: 0361-803X,1546-3141
DOI: 10.2214/ajr.170.6.9609149