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S. Biswas, A. Chandran, S. Roughley, M. Bhojak, K. Das (2015)
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4D-CT angiography differentiating arteriovenous fistula subtypesClinical Neurology and Neurosurgery, 115
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ORIGINAL RESEARCH PATIENT SAFETY Radiation Dose Reduction in 4D Cerebral CT Angiography by Individualized Estimation of Cerebral Circulation Time X M.R. Radon, X A. Chandran, X M. Bhojak, and X K.V. Das ABSTRACT BACKGROUNDANDPURPOSE: The novel technique of 4D CTA for dynamic assessment of the intracranial vessels has a greater radiation burden than conventional CTA. Previous descriptions of the technique used a fixed-duration exposure protocol. This study examines the potential for dose reduction by individualizing exposure time to patient physiology by the use of time-enhancement curve techniques as previously applied in CT angiography and venography. MATERIALS AND METHODS: 4D-CTA examinations performed at our institution were retrospectively reviewed. Scan protocols used a test-bolus scan with either a subjective estimate of the main acquisition timing (estimated-duration method) or a quantitative measure (measured-duration method). The estimated-duration method used peak arterial enhancement to determine the start of exposure, with the duration chosen at the radiologist’s discretion. The measured-duration method used arterial and venous time-enhancement curves to determine exposure start and duration. Exposure duration, study adequacy, quality score, and maximum venous enhancement were compared among groups. RESULTS: One hundred fifty-one examinations used the estimated-duration method, and 53 used measured-duration. The measured- durationmethodusedashorterexposuretime(10versus15.8seconds;P.001).Therewasnostatisticallysignificantdifferenceinthestudy adequacy rate,
American Journal of Neuroradiology – American Journal of Neuroradiology
Published: Dec 1, 2016
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