Temporal averaging of two-dimensional correlation functions for velocity vector imaging of cardiac blood flow

Takahashi, Hiroki; Hasegawa, Hideyuki; Kanai, Hiroshi

doi:10.3179/jjmu.jjmu.k.12

Cited by 5 publications

(5 citation statements)

References 22 publications

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“…Our study used BSI, a new noninvasive modality using very high frame rate ultrasound to visualize and track blood speckles within the cardiac chamber. The advantages of BSI over VFM are its high temporal resolution and that fewer mathematical assumptions are required, as BSI is less angle dependent compared with colour Doppler . The use of BSI has thus far only been reported in small case presentations and has not been validated against other imaging techniques .…”

Section: Discussionmentioning

confidence: 99%

Left ventricular vortex formation in preterm infants assessed by blood speckle imaging

2019

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Background A vortex is a rotational fluid structure formed by shearing of fluid layers. It forms during diastole in the left ventricle (LV) and helps redirect flow to the LV outflow tract for ejection, optimizing energy conservation. The aim of this study was to demonstrate the feasibility of detecting and analyzing LV vortices using a new ultrasound technique known as blood speckle imaging (BSI). Methods Conventional and BSI parameters were acquired in preterm infants referred for echocardiography. BSI feasibility and reliability were explored using highest frequency settings and optimized Nyquist limits. Vortex area was determined by tracing the outer vortex ring at maximum area. Peak vortex formation time (PVFT) was determined at time of maximum vortex area relative to the R‐wave, and vortex duration from frame‐by‐frame analysis of first appearance to vortex degradation. Results Left ventricle vortices were detected in 49 of the 50 preterm infants (weight 500–2020 g) with excellent intra‐ and inter‐observer reliability. Mean vortex area indexed to LV area was 0.19 (0.08). Peak vortex formation time was at 87 (7)% of the cardiac cycle, and vortex duration lasted 13 (4)% of the cardiac cycle. Vortex area correlated positively with LV length, end‐diastolic dimension, end‐diastolic volume, mitral annular (R +0.42, +0.50, +0.47, +0.50, all P < 0.01), and transmitral Vti (R +0.37, P < 0.01). PVFT correlated negatively with E, EA, and Ee’ (R −0.42, −0.47, −0.47, all P < 0.01). Conclusion Left ventricle vortex formation can be analyzed with two‐dimensional BSI and has the potential to complement existing parameters of cardiac health.

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Section: Discussionmentioning

confidence: 99%

Left ventricular vortex formation in preterm infants assessed by blood speckle imaging

2019

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“…After the development of shear wave elastography by Tanter, et al [11], which was the first practical application of high-frame-rate ultrasound, various studies have been conducted for cardiovascular applications, such as vascular strain and blood flow imaging [12][13][14], pulse wave imaging [15,16], and cardiac strain and blood flow imaging [17][18][19][20][21]. In addition, various studies for improvement of the image quality in high-frame-rate ultrasound have been conducted [22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Phase-Sensitive 2D Motion Estimators Using Frequency Spectra of Ultrasonic Echoes

Hasegawa

2016

Applied Sciences

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Abstract:Recently, high-frame-rate ultrasound has been extensively studied for measurement of tissue dynamics, such as pulsations of the carotid artery and heart. Motion estimators are very important for such measurements of tissue dynamics. In high-frame-rate ultrasound, the tissue displacement between frames becomes very small owing to the high temporal resolution. Under such conditions, the speckle tracking method requires high levels of interpolation to estimate such a small displacement. A phase-sensitive motion estimator is feasible because it does not suffer from the aliasing effect by such a small displacement and does not require interpolation to estimate a sub-sample displacement. In the present study, two phase-sensitive 2D motion estimators, namely, paired 1D motion estimators and 2D motion estimator with shifted cross spectra, were developed. Phase-sensitive motion estimators using frequency spectra of ultrasonic echoes have already been proposed in previous studies. However, such methods had not taken into account the ambiguity of the frequency of each component of the spectrum. We have proposed a method, which estimates the mean frequency of each component of the spectrum, and the proposed method was validated by a phantom experiment. The experimental results showed that the bias errors in the estimated motion velocities of the phantom were less than or equal to (11.5% in lateral, 2.0% in axial) by the proposed 1D paired motion estimators and (3.0%, 2.0%) by the proposed 2D motion estimators, both of which were significantly smaller than (14.0%, 3.0%) of the conventional phase-sensitive 2D motion estimator.

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“…We tested for any cardiovascular pathology. VisualSonics ultrasound (Fujifilm, Toronto, Ontario, Canada) was used, and the testing was performed as described [11]. M-mode echocardiograms were done and recorded at 50 mm/second paper speed using black and white photographic paper.…”

Section: B-mode 2-dimensional Ultrasound Imagingmentioning

confidence: 99%

Involvement of the Areae Compositae of the Heart in Endemic Pemphigus Foliaceus

Velez¹,

Upegui-Zapata

Valencia-Yepes

et al. 2019

Dermatol Pract Concept

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Background: A new variant of endemic pemphigus foliaceus in El Bagre (El Bagre-EPF), Colombia, South America, shares features with Senear-Usher syndrome and occurs in an endemic fashion. Patients affected by El Bagre-EPF have heterogeneous antigenic reactivity not only to the skin but to other organs, including the heart. Here we test for autoantibodies to the areae compositaeof the heart (structure consisting of typical desmosomal amalgamated fascia adherensmolecules)and evaluate any possible clinical correlation. Methods: A case-control study comparing 45 patients and 45 controls from the endemic area, matched by demographics including age, gender, weight, work activities, and comorbidities, was performed. Direct and indirect immunofluorescence, immunohistochemistry, confocal microscopic studies, and echocardiogram studies were completed. Results: The main clinical abnormally seen in the El Bagre-EPF patients was left ventricular hypertrophy in 15/45 patients, compared with no such findings in the control population (P < 0.1). Seventy percent of El Bagre-EPF patients and none of the controls displayed polyclonal autoreactivity using different immunoglobulins and complement to the areae compositae of the heart using different methods and antibodies (P < 0.1). Conclusions: Patients affected by El Bagre-EPF demonstrated autoantibodies to the areae compositae of the heart. This finding was associated with left ventricular hypertrophic cardiomyopathy.The areae compositaemay play a role incell junction tension and the El Bagre-EPF patients’ autoantibodies possibly disrupting these junctions and thereby contributing to the left ventricular hypertrophy.

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Temporal averaging of two-dimensional correlation functions for velocity vector imaging of cardiac blood flow

Cited by 5 publications

References 22 publications

Left ventricular vortex formation in preterm infants assessed by blood speckle imaging

Left ventricular vortex formation in preterm infants assessed by blood speckle imaging

Phase-Sensitive 2D Motion Estimators Using Frequency Spectra of Ultrasonic Echoes

Involvement of the Areae Compositae of the Heart in Endemic Pemphigus Foliaceus

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