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Year: 2008 Volume: 29 Issue: 3

Year: 2008 Volume: 29 Issue: 2

Year: 2008 Volume: 29 Issue: 1

Balancing radiation dose and image quality: clinical applications of neck volume CT.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Russell, M. T. Fink, J. R. Rebeles, F. Kanal, K. Ramos, M. Anzai, Y.
Description	Country affiliation: United States Author Affiliation: Russell MT ( Department of Radiology, University of Washington, Seattle, WA 98195-7115, USA.)
Abstract	BACKGROUND AND PURPOSE: The advancement of multidetector CT technology has resulted in improved image quality as well as an increase in ionizing radiation dose to patient. The purpose of this study was to assess radiation dose and overall image quality of CT examination of the neck between fixed-tube current and automatic tube current modulation (ATCM) at 2 separate noise index levels. MATERIALS AND METHODS: A total of 84 patients underwent neck CT with use of a 64-section multidetector row CT (MDCT) scanner. Patients were divided into 3 groups: fixed-tube current (n = 28), ATCM with a noise index of 11.4 (n = 28), and ATCM with a noise index of 20.2 (n = 28). All other scan parameters remained constant. Scan coverage length and transclavicular distance were measured. Two radiologists blinded to the scanning parameters assessed overall image quality, noise level, and streak artifacts using a 5-point grading scale. The radiation dose in dose-length product (DLP) and CT dose index (CTDI) was recorded. RESULTS: Compared with a fixed-tube current technique, ATCM with a noise index of 11.4 reduced CTDI by 20% (P < .01 x 10(-6)), and ATCM with a noise index of 20.2 reduced CTDI by 34% (P < .01 x 10(-12)). Although the difference in image quality between the fixed-tube current technique and the noise index reached statistical significance (P < .05), the magnitude of the difference was small, with average scores of 3.79 (+/-0.59) and 3.57 (+/-0.53), respectively. CONCLUSION: Compared with the fixed-tube current technique, ATCM resulted in significant reduction of radiation dose without substantially reducing the image quality of the CT of the neck. Judicious monitoring of radiation dose to patients has to be balanced with diagnostic image quality.
File Format	HTM / HTML
ISSN	01956108
e-ISSN	1936959X
Journal	American Journal of Neuroradiology
Issue Number	4
Volume Number	29
Language	English
Publisher	American Journal of Neuroradiology
Publisher Date	2008-04-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Discipline Neurology Discipline Radiology Cone-beam Computed Tomography Neck Radiation Dosage
Content Type	Text
Resource Type	Article
Subject	Radiology, Nuclear Medicine and Imaging Neurology (clinical)

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