A reconstruction method of intra-ventricular blood flow using color flow ultrasound: a simulation study

2015 ◽  
Author(s):  
Jaeseong Jang ◽  
Chi Young Ahn ◽  
Kiwan Jeon ◽  
Jung-il Choi ◽  
Changhoon Lee ◽  
...  
Keyword(s):  
Blood Flow ◽  
Simulation Study ◽  
Reconstruction Method ◽  
Color Flow

scholarly journals A Reconstruction Method of Blood Flow Velocity in Left Ventricle Using Color Flow Ultrasound

2015 ◽  
Vol 2015 ◽  
pp. 1-15 ◽  
Author(s):  
Jaeseong Jang ◽  
Chi Young Ahn ◽  
Kiwan Jeon ◽  
Jung Heo ◽  
DongHak Lee ◽  
...  
Keyword(s):  
Blood Flow ◽  
Left Ventricle ◽  
Flow Velocity ◽  
Blood Flow Velocity ◽  
Source Term ◽  
Reconstruction Method ◽  
Mass Source ◽  
Color Flow ◽  
Proposed Model ◽  
Reconstruction Performance

Vortex flow imaging is a relatively new medical imaging method for the dynamic visualization of intracardiac blood flow, a potentially useful index of cardiac dysfunction. A reconstruction method is proposed here to quantify the distribution of blood flow velocity fields inside the left ventricle from color flow images compiled from ultrasound measurements. In this paper, a 2D incompressible Navier-Stokes equation with a mass source term is proposed to utilize the measurable color flow ultrasound data in a plane along with the moving boundary condition. The proposed model reflects out-of-plane blood flows on the imaging plane through the mass source term. The boundary conditions to solve the system of equations are derived from the dimensions of the ventricle extracted from 2D echocardiography data. The performance of the proposed method is evaluated numerically using synthetic flow data acquired from simulating left ventricle flows. The numerical simulations show the feasibility and potential usefulness of the proposed method of reconstructing the intracardiac flow fields. Of particular note is the finding that the mass source term in the proposed model improves the reconstruction performance.

A Color-Doppler Shear-Wave-Imaging Phase-reconstruction Method Using Four Color Flow Images

2016 ◽  
Vol 39 (3) ◽  
pp. 172-188
Author(s):  
Naoki Sunaguchi ◽  
Yoshiki Yamakoshi ◽  
Takahito Nakajima
Keyword(s):  
Image Quality ◽  
Shear Wave ◽  
Initial Phase ◽  
Color Doppler ◽  
Reconstruction Method ◽  
Phase Reconstruction ◽  
Color Flow ◽  
Shear Wave Imaging ◽  
Wave Imaging ◽  
Phase Map

This study investigates shear wave phase map reconstruction using a limited number of color flow images (CFIs) acquired with a color Doppler ultrasound imaging instrument. We propose an efficient reconstruction method to considerably reduce the number of CFIs required for reconstruction and compare this method with Fourier analysis-based color Doppler shear wave imaging. The proposed method uses a two-step phase reconstruction process, including an initial phase map derived from four CFIs using an advanced iterative algorithm of optical interferometry. The second step reduces phase artifacts in the initial phase map using an iterative correction procedure that cycles between the Fourier and inverse Fourier domains while imposing directional filtering and total variation regularization. We demonstrate the efficacy of this method using synthetic and experimental data of a breast phantom and human breast tissue. Our results show that the proposed method maintains image quality and reduces the number of CFIs required to four; previous methods have required at least 32 CFIs to achieve equivalent image quality. The proposed method is applicable to real-time shear wave elastography using a continuous shear wave produced by a mechanical vibrator.

Color-flow Doppler sonography in the differential diagnosis and management of amiodarone-induced thyrotoxicosis

2007 ◽  
Vol 48 (6) ◽  
pp. 628-634 ◽  
Author(s):  
M. Loy ◽  
E. Perra ◽  
A. Melis ◽  
M. E. Cianchetti ◽  
M. Piga ◽  
...  
Keyword(s):  
Blood Flow ◽  
Differential Diagnosis ◽  
Clinical Outcome ◽  
Doppler Sonography ◽  
Color Flow ◽  
Therapeutic Choice ◽  
Color Flow Doppler Sonography ◽  
Increased Blood Flow

Background: Amiodarone-induced thyrotoxicosis (AIT) may be caused by excessive thyroidal hormone synthesis and release (type 1) or by a destructive process (type 2). This differentiation is considered essential for therapeutic choice. Purpose: To evaluate the utility of color-flow Doppler sonography (CFDS) in the differential diagnosis and management of AIT. Material and Methods: The clinical and laboratory data, thyroid sonography (grayscale sonography [GSS], CFDS), thyroid radioiodine uptake (RAIU) and thyroid scintigraphy, treatment, and clinical outcome were retrospectively reviewed in 21 AIT patients. The CFDS pattern of thyroid nodules was separately described from that of the perinodular parenchyma, and AIT was classified as type 1 (increased blood flow) or type 2 (low/no blood flow). Type 1 AIT patients were treated with methimazole (alone or associated with potassium perchlorate), while type 2 patients were treated with prednisone or amiodarone withdrawal alone. Results: Eleven patients with increased blood flow were considered as type 1, and 10 with low/no blood flow as type 2. Ten of the 11 patients in the first group showed a hypervascular nodular pattern, while one showed a hypervascular parenchymal pattern. Clinical diagnoses were toxic nodular goiter and Graves' disease, respectively. Of the 10 patients with low/no blood flow, six had normal thyroid volume, three small diffuse goiter, and one small multinodular goiter. The clinical outcome showed that 20 of the 21 patients were treatment responsive. Conclusion: CFDS is a useful tool in the differential diagnosis of AIT. This differentiation appeared to be of clinical relevance as regards therapeutic choice. Separate evaluation of parenchymal blood flow from that of nodules may prove beneficial in the diagnosis of underlying thyroid diseases in patients with type 1 AIT.

Renal blood flow in neonates: quantification with color flow and pulsed Doppler US.

Radiology ◽  
1992 ◽  
Vol 183 (2) ◽  
pp. 441-444 ◽  
Author(s):  
M O Visser ◽  
J O Leighton ◽  
M van de Bor ◽  
F J Walther
Keyword(s):  
Blood Flow ◽  
Renal Blood Flow ◽  
Pulsed Doppler ◽  
Color Flow ◽  
Doppler Us

Post-Radical Prostatectomy Penile Blood Flow: Assessment with Color Flow Doppler Ultrasound

1994 ◽  
Vol 152 (6 Part 2) ◽  
pp. 2276-2279 ◽  
Author(s):  
Edward D. Kim ◽  
Donna Blackburn ◽  
Kevin T. McVary
Keyword(s):  
Blood Flow ◽  
Radical Prostatectomy ◽  
Doppler Ultrasound ◽  
Color Flow
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