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Titolo:
IMAGE-ENHANCEMENT BY NONCONTRAST HARMONIC ECHOCARDIOGRAPHY - PART II - QUANTITATIVE ASSESSMENT WITH USE OF CONTRAST-TO-SPECKLE RATIO
Autore:
BELOHLAVEK M; TANABE K; MULVAGH SL; FOLEY DA; GREENLEAF JF; SEWARD JB;
Indirizzi:
MAYO CLIN,ULTRASOUND RES LAB,DIV CARDIOVASC DIS & INTERNAL MED,200 1ST ST SW ROCHESTER MN 55905 MAYO CLIN,DEPT PHYSIOL & BIOPHYS ROCHESTER MN 55905
Titolo Testata:
Mayo Clinic proceedings
fascicolo: 11, volume: 73, anno: 1998,
pagine: 1066 - 1070
SICI:
0025-6196(1998)73:11<1066:IBNHE->2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
12
Recensione:
Indirizzi per estratti:
Citazione:
M. Belohlavek et al., "IMAGE-ENHANCEMENT BY NONCONTRAST HARMONIC ECHOCARDIOGRAPHY - PART II - QUANTITATIVE ASSESSMENT WITH USE OF CONTRAST-TO-SPECKLE RATIO", Mayo Clinic proceedings, 73(11), 1998, pp. 1066-1070

Abstract

Objective: To ascertain whether ''harmonic imaging''-use of ultrasound signals with the frequency twice that of the transmitted signal for ultrasound image generation-can improve image contrast while reducing noise. Methods: Technically difficult echocardiograms (nonvisualization of 2 or more endocardial segments in a 16-segment model) from 25 patients mere analyzed. Corresponding fundamental and harmonic images of the left ventricle in the apical four-chamber, two-chamber, and long-axis views were divided into basal, mid, and apical regions. The difference in image quality between fundamental and harmonic scans was assessed by using the muscle-to-cavity contrast-to-speckle ratio (CSRmc) Results: The mean CSRmc values of pooled data revealed significant imageenhancement by harmonic scanning (CSRmc increased from 0.84 to 1.06; P<0.0001). Regression analysis showed that harmonic imaging improved the CSRmc values in 68% of all scans. Regional analysis indicated the most enhancement in basal regions (CSRmc increased from 0.96 to 1.34; P<0.0001), followed by the mid (CSRmc increased from 0.84 to 1.04; P<0.0001) and apical(CSRmc increased from 0.68 to 0.74; P = 0.0138) left ventricular regions. Conclusion: Noncontrast harmonic imaging significantly enhances suboptimal echocardiographic images, particularly in theregions distant from the transducer.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 21/09/20 alle ore 18:16:04