Successful Implementation of a Radiation Dose Reduction Strategy for CT Protocols in a Neuroradiology Section


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Inproceedings: an article in a conference proceedings.
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Poster: Summary – with images – on one page of the results of a researche project. The summaries of the poster must be entered in "Abstract" and not "Poster".
Successful Implementation of a Radiation Dose Reduction Strategy for CT Protocols in a Neuroradiology Section
Title of the conference
RSNA 2007, Radiological Society of North America, 93rd Scientific Assembly and Annual Meeting
Smith A.B., Dillon W.P., Lau B., Gould R.G., Verdun F., Wintermark M.
Chicago, Illinois, November 25-30, 2007
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PURPOSE: To quantify the impact of systematic use of tube current modulation for neuroradiology CT protocols in terms of patient dose reduction and image quality.
METHOD AND MATERIALS: As part of a retrospective study, approved by our institutional review board and in compliance with Health Insurance Portability and Accountability Act (HIPAA), we evaluated the impact of dose modulation on 4 types of neuroradiological CT studies: brain noncontrast CT (NCT) in adult patients, brain NCT in pediatric patients, adult cervical spine CT, and adult cervical and intracranial CT-angiogram (CTA). For each type of CT study, three series of 100 consecutive studies were reviewed: (1) 100 studies without dose-modulation; (2) 100 studies with Z-axis dose-modulation; (3) 100 studies with XYZ-axis dose-modulation. For each examination, the weighted computed dose tomographic index (CTDIvol) and dose length product (DLP) were recorded, and noise was measured. Each examination was reviewed by a neuroradiologist blinded to the dose modulation mode for image quality. Continuous variables (CTDIvol, DLP, noise) were compared using T-tests, and categorical variables (image quality) using Chi2 tests.
RESULTS: For adult brain NCT, CTDIvol and DLP were reduced by 60.0% and 60.3%, respectively, using Z-axis dose-modulation; and by 50.4% and 22.4%, respectively, using XYZ-axis dose-modulation. Significant dose reductions were also observed for pediatric brain NCT, cervical spine CT and CTAs. Image quality and noise were unaffected by use of dose modulation.
CONCLUSION: Dose-modulation techniques should be systematically used for neuroradiology CT examinations, because they afford significant dose reduction, while image quality is maintained.
CLINICAL RELEVANCE/APPLICATION: Utilization of dose modulation techniques results in significant reduction in radiation dose to patients for studies typically utilized in a neuroradiology department without loss of image quality.
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06/01/2009 18:23
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20/08/2019 15:58
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