Document Detail


Partial flip angle MR imaging.
MedLine Citation:
PMID:  3797669     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Theoretical analysis predicts that performing magnetic resonance (MR) imaging with partial (less than 90 degrees) flip angles can reduce imaging times two- to fourfold when lesions with elevated T1 values are being examined. This time savings occurs because repetition time (TR) is reduced when imaging is performed with partial flips. Partial flip MR imaging can also improve signal-to-noise ratio (S/N) in fast body imaging. For this study, analytical tools were used to predict image contrast and S/N for short TR, partial flip sequences. Experimental implementation of the short TR, partial flip sequences that analytical work had predicted would be optimal supported the analytical predictions and demonstrated their validity. Partial flip MR imaging is applicable to reducing imaging time only when the ratio of signal differences to noise exceeds threshold values in conventional MR images. Partial flip sequences can be used to advantage in MR imaging of both the head and the body, and the observed effects are predictable through theoretical analysis.
Authors:
T C Mills; D A Ortendahl; N M Hylton; L E Crooks; J W Carlson; L Kaufman
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Radiology     Volume:  162     ISSN:  0033-8419     ISO Abbreviation:  Radiology     Publication Date:  1987 Feb 
Date Detail:
Created Date:  1987-02-13     Completed Date:  1987-02-13     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0401260     Medline TA:  Radiology     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  531-9     Citation Subset:  AIM; IM    
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MeSH Terms
Descriptor/Qualifier:
Brain / pathology
Humans
Image Enhancement
Magnetic Resonance Spectroscopy / diagnostic use*
Grant Support
ID/Acronym/Agency:
CA 32850/CA/NCI NIH HHS; GM00943/GM/NIGMS NIH HHS

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


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