Angle-dependent backscatter from the arterial wall

Kroon, M.G.M. de; Wal, L.F. van der; Gussenhoven, W. J.; Bom, N.

doi:10.1016/0301-5629(91)90119-h

Cited by 43 publications

(14 citation statements)

References 9 publications

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“…Ultrasonic characterization of vascular tissue has evolved from the use of frequencies between 4 and 15 MHz, (6)(7)(8) to the 20-to 27-MHz range (9,10), and more recently between 25 and 65 MHz (11)(12)(13). The benefits of using higher frequencies are the improvement of image quality as well as of the characterization of the layered structure of the vessel wall and consequently of the atherosclerotic plaque.…”

Section: Introductionmentioning

confidence: 99%

Measurement of the ultrasonic properties of human coronary arteries in vitro with a 50-MHz acoustic microscope

Machado

Foster

Gotlieb

2002

Braz J Med Biol Res

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Ultrasonic attenuation coefficient, wave propagation speed and integrated backscatter coefficient (IBC) of human coronary arteries were measured in vitro over the -6 dB frequency bandwidth (36 to 67 MHz) of a focused ultrasound transducer (50 MHz, focal distance 5.7 mm, f/number 1.7). Corrections were made for diffraction effects. Normal and diseased coronary artery sub-samples (N = 38) were obtained from 10 individuals at autopsy. The measured mean ± SD of the wave speed (average over the entire vessel wall thickness) was 1581.04 ± 53.88 m/s. At 50 MHz, the average attenuation coefficient was 4.99 ± 1.33 dB/mm with a frequency dependence term of 1.55 ± 0.18 determined over the 36-to 67-MHz frequency range. The IBC values were: 17.42 ± 13.02 (sr.m) -1 for thickened intima, 11.35 ± 6.54 (sr.m) -1 for fibrotic intima, 39.93 ± 50.95 (sr.m) -1 for plaque, 4.26 ± 2.34 (sr.m) -1 for foam cells, 5.12 ± 5.85 (sr.m) -1 for media and 21.26 ± 31.77 (sr.m) -1 for adventitia layers. The IBC results indicate the possibility for ultrasound characterization of human coronary artery wall tissue layer, including the situations of diseased arteries with the presence of thickened intima, fibrotic intima and plaque. The mean IBC normalized with respect to the mean IBC of the media layer seems promising for use as a parameter to differentiate a plaque or a thickened intima from a fibrotic intima.

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Section: Introductionmentioning

confidence: 99%

Measurement of the ultrasonic properties of human coronary arteries in vitro with a 50-MHz acoustic microscope

Machado

Foster

Gotlieb

2002

Braz J Med Biol Res

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“…Further, it is possible to discriminate between muscular and elastic arteries and to assess the composition of the atherosclerotic lesion by qualitative evaluation of the B-mode echo images [6][7][8][9]. It has been shown that the echogenicity of the arterial wall depends on the angle of incidence of the incoming ultrasonic pulse [10]. For an a-centric position of the catheter, a non-circular shape of the arterial cross-section or a bending or widening artery, the incident beam might not be perpendicular to the surfaces of the tissue layers in the arterial wall (Fig.…”

Section: Introductionmentioning

confidence: 99%

Backscatter directivity and integrated backscatter power of arterial tissue

et al. 1991

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A 27 MHz transducer, mounted on an ultrasonic microscope, was used to quantify the dependence of backscatter power on the angle of incidence of arterial vessels. Due to variations in the angle of incidence significant variations in backscatter power were found in the intima, the muscular and elastic media, the adventitia and the external elastic lamina. The muscular and the elastic media show anisotropic behaviour in their angle dependence, i.e. the extent of the angle dependence depends on the direction of angle variation. This anisotropic nature is probably caused by the dominant orientation of smooth muscle cells or elastin fibers in these tissue layers. Measurements on 13 specimens of the iliac artery showed that each tissue type of the vessel has its own specific angle dependent behaviour. In the future this property might be used for quantitative tissue characterization.

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“…Their study concluded that when the distance or the angle toward the luminal wall increases, the intensity will decrease for both intimamedia tissue and adventitia tissue. Earlier work [8][9][10] shows that the reflected ultrasound signal is critically dependent on the angle of incidence and varies for different types of arterial plaques.…”

Section: Introductionmentioning

confidence: 99%

Analysis and compensation for the effect of the catheter position on image intensities in intravascular optical coherence tomography

et al. 2016

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, "Analysis and compensation for the effect of the catheter position on image intensities in intravascular optical coherence tomography," J. Abstract. Intravascular optical coherence tomography (IVOCT) is an imaging technique that is used to analyze the underlying cause of cardiovascular disease. Because a catheter is used during imaging, the intensities can be affected by the catheter position. This work aims to analyze the effect of the catheter position on IVOCT image intensities and to propose a compensation method to minimize this effect in order to improve the visualization and the automatic analysis of IVOCT images. The effect of catheter position is modeled with respect to the distance between the catheter and the arterial wall (distance-dependent factor) and the incident angle onto the arterial wall (angle-dependent factor). A light transmission model incorporating both factors is introduced. On the basis of this model, the interaction effect of both factors is estimated with a hierarchical multivariant linear regression model. Statistical analysis shows that IVOCT intensities are significantly affected by both factors with p < 0.001, as either aspect increases the intensity decreases. This effect differs for different pullbacks. The regression results were used to compensate for this effect. Experiments show that the proposed compensation method can improve the performance of the automatic bioresorbable vascular scaffold strut detection. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Angle-dependent backscatter from the arterial wall

Cited by 43 publications

References 9 publications

Measurement of the ultrasonic properties of human coronary arteries in vitro with a 50-MHz acoustic microscope

Measurement of the ultrasonic properties of human coronary arteries in vitro with a 50-MHz acoustic microscope

Backscatter directivity and integrated backscatter power of arterial tissue

Analysis and compensation for the effect of the catheter position on image intensities in intravascular optical coherence tomography

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