A5080928472- Aortic aneurysm repair treatments
- Aortic Disease and Treatment Approaches
- Cardiac Valve Diseases and Treatments
- Renal and Vascular Pathologies
- Cardiac, Anesthesia and Surgical Outcomes
- Hemodynamic Monitoring and Therapy
- Vascular Procedures and Complications
- Infectious Aortic and Vascular Conditions
- Peripheral Artery Disease Management
- Cardiovascular Health and Disease Prevention
- Vascular anomalies and interventions
- Venous Thromboembolism Diagnosis and Management
- Congenital Heart Disease Studies
- Elasticity and Material Modeling
- Abdominal Surgery and Complications
- Abdominal vascular conditions and treatments
- MRI in cancer diagnosis
- Central Venous Catheters and Hemodialysis
- Advanced Vision and Imaging
- Advanced Numerical Analysis Techniques
- Vascular Anomalies and Treatments
- Airway Management and Intubation Techniques
- Intracranial Aneurysms: Treatment and Complications
- Pediatric Urology and Nephrology Studies
- Reconstructive Surgery and Microvascular Techniques
California State University, Long Beach
2020-2024
Stanford University
2013-2023
Zero to Three
2018
Abdominal aortic aneurysm (AAA) is often accompanied by in traluminal thrombus (ILT), which complicates AAA progression and risk of rupture. Patient-specific computational fluid dynamics modeling 10 small human was performed to investigate relations between hemodynamics ILT progression. The patients were imaged using magnetic resonance twice a 2- 3-yr interval. Wall content data obtained planar T1-weighted fast spin echo black-blood scan, enabled quantification thickness at midaneurysm...
Objective: To utilize 3-D modeling techniques to better characterize geometric deformations of the supra-aortic arch branch vessels and descending thoracic aorta after endovascular aortic repair. Methods: Eighteen patients underwent repair either type B dissection (n = 10) or aneurysm 8). Computed tomography angiography was obtained pre- postprocedure, models were constructed. Branch angle curvature metrics ascending aorta, arch, stented lumen calculated both at postintervention. Results:...
Vascular morphology characterization is useful for disease diagnosis, risk stratification, treatment planning, and prediction of durability. To quantify the dynamic surface geometry tubular-shaped anatomic structures, we propose a simple, rigorous Lagrangian cylindrical coordinate system to monitor well-defined points. Specifically, proposed enables quantification curvature cross-sectional eccentricity. Using idealized software phantom examples, validate method's ability accurately...
Purpose To quantify renal artery deformation due to respiration using magnetic resonance (MR) image‐based geometric analysis. Materials and Methods Five males were imaged with contrast‐enhanced MR angiography during inspiratory expiratory breath‐holds. From 3D models of the abdominal aorta, left right arteries (LRA RRA), we quantified branching angle, curvature, peak curve axial length, locations branch points. Results With expiration, maximum curvature changes 0.054 ± 0.025 mm −1 ( P <...
Thoracic endovascular aortic repair (TEVAR) can change the morphology of flow lumen in dissections, which may affect hemodynamics and function. This study characterizes how helical true type B dissections is altered by TEVAR.Patients with dissection who underwent computed tomography angiography before after TEVAR were retrospectively reviewed. Images used to construct three-dimensional stereolithographic surface models whole aorta using custom software. Stereolithographic segmented...
Since the introduction of transcatheter aortic valve (AV) implantation as a viable option, surgical bioprosthetic AVs have recently started incorporating shorter struts considering future valve-in-valve procedures. However, effect leaflet coaptation geometry on longevity these valves remains unexplored. To address this gap, we performed finite element analysis with varying strut heights using two-way fluid-structure interaction method. establish baseline, used standard height based rendered...
The thoracic aorta is a highly mobile organ whose dynamics are altered by endovascular repair (TEVAR). aim of this study was to quantify cardiac pulsatility-induced multi-axial deformation the before and after descending aortic TEVAR.Eleven TEVAR patients (8 males 3 females, age 57-89) underwent retrospective cardiac-gated CT angiography TEVAR. 3D geometric models were constructed, lumen centerlines, inner outer surface curves, cross-sections extracted measure arclength, centerline, surface,...
We aim to quantify multiaxial cardiac pulsatility-induced deformation of the thoracic aorta after ascending endovascular aortic repair (TEVAR) as a part GORE ARISE Early Feasibility Study.Fifteen patients (7 females and 8 males, age 73±9 years) with TEVAR underwent computed tomography angiography retrospective gating. Geometric modeling was performed; geometric features including axial length, effective diameter, centerline, inner surface, outer surface curvatures were quantified for systole...
Abstract Purpose: To evaluate rest and exercise hemodynamics in patients with abdominal aortic aneurysms (AAA) peripheral occlusive disease (claudicants) using phase‐contrast MRI. Materials Methods: Blood velocities were acquired by means of cardiac‐gated cine a 0.5 Tesla (T) open Volumetric flow was calculated at the supraceliac (SC), infrarenal (IR), mid‐aneurysm (MA) levels during upright cycling an MR‐compatible cycle. Results: Mean blood increased (AAA: 130%, Claudicants: 136% resting...
The study purpose is to optimize modeling parameters, specifically segmentation spacing and centerline extraction, efficiently construct accurate 3D aortic models. Models are constructed by extraction orthogonal 2D segmentations. We examine the effect of interval (2, 1, 0.5, 0.25 cm) iteration (one, two, three iterations) for constructing models Healthy, Tortuous, Aneurysmal, Dissected human thoracic aortas. Aortic arclength, curvature, cross-sectional axis ratio were computed compare...
Objectives Thoracic endovascular aortic repair has become a preferred treatment strategy for thoracic aneurysms and dissections. Yet, it is not well understood if the performance of endografts affected by physiologic strain due to cyclic motion during cardiac pulsation respiration. We aim quantify cardiac- respiratory-induced changes postthoracic aorta endograft geometries. Methods Fifteen patients (66 ± 10 years) underwent cardiac-resolved computed tomography angiographies...
Abstract Precise description of vascular morphometry is crucial to support medical device manufacturers and clinicians for improving development interventional outcomes. A compact intuitive method presented automatically characterize the surface geometry tubular anatomic structures quantify curvatures starting from generic stereolithographic (STL) surfaces. The was validated with software phantoms used longitudinal 37 human thoracic aortas aneurysm or dissection. quantification showed good...