A5035371115- Cardiac Imaging and Diagnostics
- Advanced MRI Techniques and Applications
- MRI in cancer diagnosis
- Radiation Dose and Imaging
- Atomic and Subatomic Physics Research
- Cardiovascular Function and Risk Factors
- Advanced X-ray and CT Imaging
- Cardiac Valve Diseases and Treatments
- Congenital Heart Disease Studies
- Vascular anomalies and interventions
- Cardiac Structural Anomalies and Repair
- Radiology practices and education
- Ultrasound in Clinical Applications
- Coronary Artery Anomalies
- Aortic Disease and Treatment Approaches
- Cardiac, Anesthesia and Surgical Outcomes
- Acute Myocardial Infarction Research
- Coronary Interventions and Diagnostics
- Mechanical Circulatory Support Devices
- Cerebrovascular and Carotid Artery Diseases
- Infective Endocarditis Diagnosis and Management
- Appendicitis Diagnosis and Management
- Pelvic and Acetabular Injuries
- Cardiac tumors and thrombi
- Trauma and Emergency Care Studies
Stanford University
2022-2024
Palo Alto University
2024
University of California, Irvine Medical Center
2012-2020
University of California, Irvine
2009-2020
Cedars-Sinai Medical Center
2017
Group Health Cooperative
2015-2016
University of California, San Francisco
2016
University of California, Los Angeles
2006-2014
University of California System
2014
UCLA Medical Center
2009
Background: Coronary artery calcium (CAC) is an established predictor of future major adverse atherosclerotic cardiovascular events in asymptomatic individuals. However, limited data exist as to how CAC compares with functional testing (FT) estimating prognosis symptomatic patients. Methods: In the PROMISE trial (Prospective Multicenter Imaging Study for Evaluation Chest Pain), patients stable chest pain (or dyspnea) and intermediate pretest probability obstructive coronary disease were...
Lung cancer is the leading cause of cancer-related deaths worldwide, with a dismal 5-year survival rate 15%. The TNM (tumor-node-metastasis) classification system for lung vital guide determining treatment and prognosis. Despite importance accuracy in staging, however, correct staging remains challenging task many radiologists. new 7th edition features number revisions, including subdivision tumor categories on basis size, differentiation between local intrathoracic distant metastatic...
To summarize data on computed tomographic (CT) radiation doses collected from consecutive CT examinations performed at 12 facilities that can contribute to the creation of reference levels.The study was approved by institutional review boards collaborating institutions and compliant with HIPAA. Radiation dose metrics were prospectively electronically 199 656 in 83 181 adults 3871 2609 children five University California medical centers during 2013. The median volume index (CTDIvol),...
In the past decade, lung transplantation has become established as an accepted therapy for end-stage pulmonary disease. Complications of that may occur in immediate or longer postoperative term include mechanical problems due to a size mismatch between donor and recipient thoracic cage; malposition monitoring tubes lines; injuries from ischemia reperfusion; acute pleural events; hyperacute, acute, chronic rejection; infections; bronchial anastomotic complications; thromboembolism; upper-lobe...
The purpose of this study was to determine the image quality and diagnostic accuracy three-dimensional (3D) unenhanced steady state free precession (SSFP) magnetic resonance angiography (MRA) for evaluation thoracic aortic diseases.Fifty consecutive patients with known or suspected disease underwent free-breathing ECG-gated SSFP MRA non-selective radiofrequency excitation contrast-enhanced (CE) thorax at 1.5 T. Two readers independently evaluated two datasets in root, ascending aorta, arch,...
Objectives: To evaluate the feasibility of three-dimensional (3D) steady-state free-precession (SSFP) magnetic resonance angiography (MRA) using nonselective radiofrequency excitation in assessment cardiac morphology, thoracic aorta, main pulmonary, and proximal coronary arteries. Material Methods: Thirty consecutive patients (19 males; 11 females; age range, 20–74) with various vascular diseases underwent free-breathing respiratory navigator-gated electrocardiogram-triggered noncontrast...
To assess cardiothoracic structure and function in patients with pectus excavatum compared control subjects using cardiovascular magnetic resonance imaging (CMR).
Radiation doses for computed tomography (CT) vary substantially across institutions.To assess the impact of institutional-level audit and collaborative efforts to share best practices on CT radiation 5 University California (UC) medical centers.In this before/after interventional study, we prospectively collected dose metrics all diagnostic examinations performed between October 1, 2013, December 31, 2014, at centers. Using data from January March (baseline), created reports detailing...
Purpose To determine patient, vendor, and institutional factors that influence computed tomography (CT) radiation dose. Materials Methods The relevant review boards approved this HIPAA-compliant study, with waiver of informed consent. Volume CT dose index (CTDIvol) effective in 274 124 head, chest, abdominal examinations performed adult patients at 12 facilities 2013 were collected prospectively. Patient, characteristics could be used to predict (a) median by using linear regression after...
Abstract Purpose Widely used conventional 2D T 2 * approaches that are based on breath‐held, electrocardiogram (ECG)–gated, multi‐gradient‐echo sequences prone to motion artifacts in the presence of incomplete breath holding or arrhythmias, which is common cardiac patients. To address these limitations, a 3D, non‐ECG‐gated, free‐breathing technique enables rapid whole‐heart coverage was developed and validated. Methods A continuous random Gaussian 3D k‐space sampling implemented using...
The purpose of this HIPAA-compliant study was to prospectively evaluate the technical feasibility a multistation high-spatial-resolution whole-body magnetic resonance (MR) angiography protocol in which high-acceleration parallel imaging (with acceleration factors three and four) is performed with 32-channel 3.0-T MR system. After institutional review board approval written informed consent were obtained, 10 healthy volunteers (four men six women aged 23–68 years) four patients (two two 56–79...
The purpose of our study was to evaluate the use preoperative MR angiography lower extremities at 3 T in candidates for fibular free flap harvesting, identifying atherosclerotic occlusive disease and congenital anomalies this population. Our intention document influence imaging findings on surgical approach used.Twenty-nine consecutive adult patients with facial abnormalities necessitating mandibular resection subsequent osteocutaneous reconstruction who underwent were retrospectively...
Cystic adventitial disease (CAD) of the popliteal artery is a rare vascular unknown etiology in which mucin-containing cyst develops layer artery. We report case 26-year-old male with CAD right diagnosed non-invasively 3 Tesla cardiovascular magnetic resonance and confirmed on post-operative histopathology.
Purpose: To evaluate the feasibility of 3-dimensional (3D) steady-state free-precession (SSFP) magnetic resonance angiography (MRA) using nonselective radiofrequency excitation for imaging pulmonary veins (PVs) without intravenous gadolinium chelate and to correlate results with conventional contrast-enhanced MRA (CE-MRA). Material Methods: Forty consecutive patients history atrial fibrillation underwent free-breathing respiratory navigator-gated electrocardiogram-triggered SSFP contrast...
Purpose: To assess the incremental diagnostic value of time-resolved three-dimensional (3D) magnetic resonance (MR) angiography over single-phase 3D MR and cine imaging in juvenile adult patients with congenital heart disease (CHD). Materials Methods: The study was HIPAA compliant approved by institutional review board. Written informed consent obtained from each patient. Eighty-one consecutive (46 male 35 female patients; mean age, 31.1 years ± 13.5 [standard deviation]) CHD were examined a...
To determine whether contrast material dose reduction at 3.0 T allows preserved image quality for high-spatial-resolution magnetic resonance (MR) angiography of the lower extremities.Forty-five consecutive patients (27 men, 18 women; mean age, 64 years) underwent material-enhanced MR extremities T. A waiver informed consent was granted by institutional review board. Sixteen received high-dose (approximately 0.3 mmol/kg), 15 intermediate-dose 0.2 and 14 low-dose 0.1 mmol/kg) gadopentetate...
To evaluate the technical feasibility of high spatial resolution contrast-enhanced magnetic resonance angiography (CE-MRA) with highly accelerated parallel acquisition at 3.0 T using a 32-channel phased array coil, and relaxivity contrast agent.Ten adult healthy volunteers (5 men, 5 women, aged 21-66 years) underwent CE-MRA pulmonary circulation. Imaging was performed 3 phase coil. After intravenous injection 1 mL gadobenate dimeglumine (Gd-BOPTA) 1.5 mL/s, timing bolus used to measure...
To evaluate the feasibility of three-dimensional (3D) steady state free precession (SSFP) magnetic resonance angiography (MRA) using nonselective radiofrequency excitation for assessment thoracic central veins.Thirty consecutive patients (17 males, 13 females, age range 22-76) with various cardiac and vascular diseases underwent free-breathing electrocardiogram-gated noncontrast SSFP MRA conventional high-resolution 3D contrast-enhanced (CE) thorax at 1.5 T. Two readers evaluated both...