Document Detail


Evaluation of two objective methods to optimize kVp and personnel exposure using a digital indirect flat panel detector and simulated veterinary patients.
MedLine Citation:
PMID:  23293957     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
It is important to optimize digital radiographic technique settings for small animal imaging in order to maximize image quality while minimizing radiation exposure to personnel. The purpose of this study was to evaluate two objective methods for determining optimal kVp values for an indirect flat panel digital detector. One method considered both image quality and personnel exposure as endpoints and one considered only image quality. Phantoms simulated veterinary patients of varying thicknesses with lesions of varying sizes. Phantoms were exposed to a range of kVp values (60, 81, 100, and 121), using different mAs settings for each phantom. Additionally, all phantoms were exposed to a standard test exposure of 100 kVp/2.5 mAs. Scattered radiation was recorded and used as a measure of personnel exposure. When personnel exposure was considered, a figure of merit was calculated as an endpoint of optimization. The optimal kVp value for each phantom was determined based on the highest signal difference-to-noise ratio with or without inclusion of the figure of merit. When personnel exposure was not considered, increasing kVp resulted in higher signal difference-to-noise ratios and personnel exposure increased when both patient thickness and kVp increased. Findings indicated that a single standard technique of 100 kVp/2.5 mAs was only optimal for most medium-sized patients. Images of thinner patients should be made with a lower kVp. Very large patients require a higher kVp than 100 regardless of the optimization method used. Personnel exposure from optimized techniques was low and not expected to exceed annual occupational dose limits.
Authors:
Christina Copple; Ian D Robertson; Donald E Thrall; Ehsan Samei
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Publication Detail:
Type:  Comparative Study; Evaluation Studies; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Veterinary radiology & ultrasound : the official journal of the American College of Veterinary Radiology and the International Veterinary Radiology Association     Volume:  54     ISSN:  1058-8183     ISO Abbreviation:  Vet Radiol Ultrasound     Publication Date:    2013 Jan-Feb
Date Detail:
Created Date:  2013-01-08     Completed Date:  2013-03-19     Revised Date:  2013-04-30    
Medline Journal Info:
Nlm Unique ID:  9209635     Medline TA:  Vet Radiol Ultrasound     Country:  United States    
Other Details:
Languages:  eng     Pagination:  9-16     Citation Subset:  IM    
Copyright Information:
© 2012 Veterinary Radiology & Ultrasound.
Affiliation:
Department of Molecular Biomedical Sciences, North Carolina State University, Raleigh, NC, USA.
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MeSH Terms
Descriptor/Qualifier:
Animal Technicians*
Animals
Humans
Occupational Exposure / prevention & control*
Phantoms, Imaging / standards*,  veterinary
Quality Control
Radiation Dosage
Radiation Monitoring / instrumentation*,  methods
Radiographic Image Enhancement / instrumentation,  methods*
Reference Values
Signal-To-Noise Ratio
Comments/Corrections
Erratum In:
Vet Radiol Ultrasound. 2013 Mar-Apr;54(2):203

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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