Intraventricular Flow Velocity Vector Visualization Based on the Continuity Equation and Measurements of Vorticity and Wall Shear Stress

Itatani, Keiichi; Okada, Takashi; Uejima, Tokuhisa; Tanaka, Tomohiko; Ōno, Minoru; Miyaji, Kagami; Takenaka, Katsu

doi:10.7567/jjap.52.07hf16

Cited by 119 publications

(112 citation statements)

References 16 publications

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“…The VFM enables visualization of the intraventricular flow velocity vector using color Doppler and speckle tracking data [5,6]. The EL can be computed from the intraventricular flow velocity vector field [5].…”

Section: Discussionmentioning

confidence: 99%

“…If the aliasing phenomenon was observed in color Doppler data, the aliased area was manually corrected. The software computed the velocity vector fields of the LV intracavitary blood flow based on a system developed by Itatani et al [5]. In brief, a two-dimensional continuity equation was applied to the color Doppler data using speckle tracking as the boundary conditions, and the velocity component perpendicular to the echo beam line was obtained.…”

Section: Vector Flow Mapping Analysismentioning

confidence: 99%

“…Vector flow mapping (VFM) is a novel echocardiographic technology, which enables visualization of the intraventricular flow velocity vector using color Doppler and speckle tracking data [5,6]. The dissipative energy loss (EL)-derived from the intraventricular flow velocity vector field-is a flow dynamic parameter that reflects spatial dispersion of intraventricular blood flow [5].…”

Section: Introductionmentioning

confidence: 99%

“…The dissipative energy loss (EL)-derived from the intraventricular flow velocity vector field-is a flow dynamic parameter that reflects spatial dispersion of intraventricular blood flow [5]. A quantitative assessment of the LV intracavitary blood flow in terms of EL could provide insight into LV function.…”

Section: Introductionmentioning

confidence: 99%

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Dissipative energy loss within the left ventricle detected by vector flow mapping in children: Normal values and effects of age and heart rate

Hayashi

Itatani

Inuzuka

et al. 2015

Journal of Cardiology

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Section: Discussionmentioning

confidence: 99%

Section: Vector Flow Mapping Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Dissipative energy loss within the left ventricle detected by vector flow mapping in children: Normal values and effects of age and heart rate

Hayashi

Itatani

Inuzuka

et al. 2015

Journal of Cardiology

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“…Welding residual stress, as a stress vector [17], can be divided into components of three directions.…”

Section: Measurement Results Of Welding Residual Stressmentioning

confidence: 99%

Material Test on Strain Fracture and Crack Opening Displacement Based on Digital Image Correlation Method

Bian

2016

Archives of Civil Engineering

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As a machining technology, welding can cause serious accidents by overloading or operation mistakes. Through analyzing the causes of various welding accidents, we found that the major cause for damage imposed after welding parts are loaded is the fracture of materials. Therefore, studying the influence of welding residual stress on the fracture property of materials is of great significance. This paper applied the digital image correlation technique to study the fracture property of welding parts under the influence of welding residual stress.In addition, standard parts and welding parts were selected to carry out a contrast experiment. Room temperature tensile tests were performed on both standard parts and test pieces after residual stress measurement. Using displacement field and strain field data obtained through VIC-2D software, the stress intensity factor around the crack tip of each specimen under the conditions of small load was calculated and corresponding analysis was carried out.

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Postendovascular Aneurysmal Repair Increase in Local Energy Loss for Fusiform Abdominal Aortic Aneurysm: Assessments With 4D flow MRI

Horiguchi

Takehara

Sugiyama

et al. 2022

Magnetic Resonance Imaging

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Background: Although endovascular aneurysmal repair (EVAR) is a preferred treatment for abdominal aortic aneurysm (AAA) owing to its low invasiveness, its impact on the local hemodynamics has not been fully assessed. Purpose: To elucidate how EVAR affects the local hemodynamics in terms of energy loss (EL). Study Type: Prospective single-arm study. Field Strength/Sequence: A 3.0 T/4D flow MRI using a phase-contrast three-dimensional cine-gradient-echo sequence. Population: A total of 13 consecutive patients (median [interquartile range] age: 77.0 [73.0, 78.8] years, 11 male) scheduled for EVAR as an initial treatment for fusiform AAA. Assessment: 4D flow MRI covering the abdominal aorta and bilateral common iliac arteries and the corresponding stentgraft (SG) lumen was performed before and after EVAR. Plasma brain natriuretic peptide (BNP) was measured within 1 week before and 1 month after EVAR. The hemodynamic data, including mean velocity and the local EL, were compared pre-/post-EVAR. EL was correlated with AAA neck angle and with BNP. Patients were subdivided into deformed (N = 5) and undeformed SG subgroups (N = 8) and pre-/post-EVAR BNP compared in each. Statistics: Parametric or nonparametric methods. Spearman's rank correlation coefficients (r). The interobserver/ intraobserver variabilities with Bland-Altman plots. A P value < 0.05 is considered significant. Results: The mean velocity (cm/sec) at the AAA was five times greater after EVAR: 4.79 AE 0.32 vs. 0.91 AE 0.02. The total EL (mW) increased by 1.7 times after EVAR: 0.487 (0.420, 0.706) vs. 0.292 (0.192, 0.420). The total EL was proportional to the AAA neck angle pre-EVAR (r = 0.691) and post-EVAR (r = 0.718). BNP (pg/mL) was proportional to the total EL post-EVAR (r = 0.773). In the deformed SG group, EL (0.349 [0.261, 0.416]) increased 2.4-fold to 0.848 (0.597, 1.13), and the BNP 90.3 (53.6, 105) to 100 (67.2, 123) post-EVAR. Conclusion:The local EL showed a 1.7-fold increase after EVAR. The larger increase in the EL in the deformed SG group might be a potential concern for frail patients.

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Intraventricular Flow Velocity Vector Visualization Based on the Continuity Equation and Measurements of Vorticity and Wall Shear Stress

Cited by 119 publications

References 16 publications

Dissipative energy loss within the left ventricle detected by vector flow mapping in children: Normal values and effects of age and heart rate

Dissipative energy loss within the left ventricle detected by vector flow mapping in children: Normal values and effects of age and heart rate

Material Test on Strain Fracture and Crack Opening Displacement Based on Digital Image Correlation Method

Postendovascular Aneurysmal Repair Increase in Local Energy Loss for Fusiform Abdominal Aortic Aneurysm: Assessments With 4D flow MRI

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