Radiation dose reduction strategy for CT protocols: successful implementation in neuroradiology section

Détails

ID Serval
serval:BIB_1F6BE572DE42
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Radiation dose reduction strategy for CT protocols: successful implementation in neuroradiology section
Périodique
Radiology
Auteur(s)
Smith  A. B., Dillon  W. P., Lau  B. C., Gould  R., Verdun  F. R., Lopez  E. B., Wintermark  M.
ISSN
1527-1315
Statut éditorial
Publié
Date de publication
2008
Peer-reviewed
Oui
Volume
247
Numéro
2
Pages
499-506
Notes
Smith, Alice B Dillon, William P Lau, Benison C Gould, Robert Verdun, Francis R Lopez, Edward B Wintermark, Max United States Radiology Radiology. 2008 May;247(2):499-506. Epub 2008 Mar 27.
Résumé
PURPOSE: To retrospectively quantify the effect of systematic use of tube current modulation for neuroradiology computed tomographic (CT) protocols on patient dose and image quality. MATERIALS AND METHODS: This HIPAA-compliant study had institutional review board approval, with waiver of informed consent. The authors evaluated the effect of dose modulation on four types of neuroradiologic CT studies: brain CT performed without contrast material (unenhanced CT) in adult patients, unenhanced brain CT in pediatric patients, adult cervical spine CT, and adult cervical and intracranial CT angiography. For each type of CT study, three series of 100 consecutive studies were reviewed: 100 studies performed without dose modulation, 100 studies performed with z-axis dose modulation, and 100 studies performed with x-y-z-axis dose modulation. For each examination, the weighted volume CT dose index (CTDI(vol)) and dose-length product (DLP) were recorded and noise was measured. Each study was also reviewed for image quality. Continuous variables (CTDI(vol), DLP, noise) were compared by using t tests, and categorical variables (image quality) were compared by using Wilcoxon rank-sum tests. RESULTS: For unenhanced CT of adult brains, the CTDI(vol) and DLP, respectively, were reduced by 60.9% and 60.3%, respectively, by using z-axis dose modulation and by 50.4% and 22.4% by using x-y-z-axis dose modulation. Significant dose reductions (P < .001) were also observed for pediatric unenhanced brain CT, cervical spine CT, and adult cervical and intracranial CT angiography performed with each dose modulation technique. Image quality and noise were unaffected by the use of either dose modulation technique (P > .05). CONCLUSION: Use of dose-modulation techniques for neuroradiology CT examinations affords significant dose reduction while image quality is maintained.
Mots-clé
Adult Brain/radiography Cervical Vertebrae/radiography Child Humans *Radiation Dosage Radiometry/methods Retrospective Studies Statistics, Nonparametric Tomography, X-Ray Computed/instrumentation/*methods
Pubmed
Web of science
Création de la notice
06/01/2009 10:33
Dernière modification de la notice
20/08/2019 12:55
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