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Titolo:
Influence of instrument settings on flow signal and background noise in power Doppler US - An experimental study using a flow phantom with hyperechoic background
Autore:
Yoon, DY; Choi, BI; Kim, TK; Han, JK; Yeon, KM;
Indirizzi:
Seoul Natl Univ, Coll Med, Dept Radiol, Chongno Gu, Seoul 110744, South Korea Seoul Natl Univ Seoul South Korea 110744 o Gu, Seoul 110744, South Korea Hallym Univ, Coll Med, Dept Radiol, Seoul, South Korea Hallym Univ SeoulSouth Korea Coll Med, Dept Radiol, Seoul, South Korea
Titolo Testata:
INVESTIGATIVE RADIOLOGY
fascicolo: 12, volume: 34, anno: 1999,
pagine: 781 - 784
SICI:
0020-9996(199912)34:12<781:IOISOF>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
COMPUTER-ANALYSIS; COLOR; SONOGRAPHY; VASCULARITY; VASCULATURE; PRINCIPLES; DEPICTION; ENERGY;
Keywords:
blood, flow dynamics; ultrasound, power Doppler studies; ultrasound, experimental studies;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
17
Recensione:
Indirizzi per estratti:
Indirizzo: Choi, BI Seoul Natl Univ, Coll Med, Dept Radiol, Chongno Gu, 28 Yongon Dong, Seoul 110744, South Korea Seoul Natl Univ 28 Yongon Dong Seoul South Korea 110744 th Korea
Citazione:
D.Y. Yoon et al., "Influence of instrument settings on flow signal and background noise in power Doppler US - An experimental study using a flow phantom with hyperechoic background", INV RADIOL, 34(12), 1999, pp. 781-784

Abstract

OBJECTIVE. TO determine the influence of various power Doppler instrument settings on intensities of flow signal and background noise in flow with a tissue-equivalent phantom. METHODS. Power Doppler images were obtained with changing wall filter level (low, medium, high, and maximum), pulse repetition frequency (PRF; 500, 700, 1000, 1500, 3000, and 6000 Hz), and Doppler gain (60%, 70%, 80%, 90%, and 100%) at different how velocities (13.3, 26.5, and 49.8 cm/sec). To makea quantitative comparison of different settings, the authors measured the intensities of flow signal and background noise in obtained power Doppler images using the scanner and a computer program, calculated signal-to-noise difference (SND; intensity of how signal - intensity of background noise), and evaluated the relation between SND and power Doppler settings. RESULTS. The intensities of flow signal and background noise were proportional to flow velocity and power Doppler gain but were inversely proportional to PRF and wall filter level. At constant wall filter level (medium), changes of PRF and Doppler gain to the same directions resulted in a high SND. At constant PRF (1000 Hz), changes of wall filter and Doppler gain to the same directions also resulted in a high SND. However, at constant Doppler gain (80%), a high SND was obtained with changing wall filter level and PRF to the opposite directions. CONCLUSIONS. Three Doppler instrument settings-wall filter level, pulse repetition frequency, and Doppler gain-have reciprocal influences on SND.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/11/20 alle ore 11:57:41