12 May 1995 Influence of Doppler-tipped guidewire position in coronary artery on blood flow velocity
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Abstract
A pulsatile blood flow model was used to estimate the influence of position of Doppler guide wires with 12 MHz forward looking ultrasound transducers on the average spectral peak velocity. Three 0.014-inch and three 0.018-inch Doppler guide wires were positioned in plastic tubes ranging from 1.7 mm to 8.0 mm internal diameter. Blood flow of 50, 100 and 200 ml/min was adjusted using a roller-pump. The flow velocity was lower by 54% near the wall than in the center of large tubes (diameter 8.0 mm). In tubes of 2.9 mm and 4.2 mm in diameter the maximum variations were 11% and 22.5% for the 0.014-inch guide wire and 7.5% and 20% for the 0.018-inch guide wire, respectively. No variance in velocity related to wire position was observed in small (1.7 mm) tubes. The system was not sensitive to angular displacement of the guide wire in the range of +/- 30 degree(s). These results demonstrate that intravascular Doppler ultrasound flowmeter may be accurately utilized for measurements of blood flow velocity in small coronary arteries without any need to reposition the guidewire.
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Ivan S. Melnik, Patrick J. Dupouy, Jan Kvasnicka, Herbert J. Geschwind, "Influence of Doppler-tipped guidewire position in coronary artery on blood flow velocity", Proc. SPIE 2395, Lasers in Surgery: Advanced Characterization, Therapeutics, and Systems V, (12 May 1995); doi: 10.1117/12.209131; https://doi.org/10.1117/12.209131
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