A5001642240- Advanced MRI Techniques and Applications
- Cardiac Imaging and Diagnostics
- MRI in cancer diagnosis
- Cardiovascular Function and Risk Factors
- Atomic and Subatomic Physics Research
- Semiconductor Quantum Structures and Devices
- Radiomics and Machine Learning in Medical Imaging
- Quantum and electron transport phenomena
- Radiology practices and education
- Radiation Dose and Imaging
- Cardiac Arrhythmias and Treatments
- Advanced X-ray and CT Imaging
- Cardiac electrophysiology and arrhythmias
- Lanthanide and Transition Metal Complexes
- Molecular Junctions and Nanostructures
- Quantum Information and Cryptography
- Ultrasound and Hyperthermia Applications
- Cardiac pacing and defibrillation studies
- Abdominal vascular conditions and treatments
- Quantum Dots Synthesis And Properties
- Quantum optics and atomic interactions
- Advanced Malware Detection Techniques
- Cardiac Valve Diseases and Treatments
- Renal and Vascular Pathologies
- Venous Thromboembolism Diagnosis and Management
New York University
2010-2025
University of Chicago
2019-2025
The University of Sydney
2024
NYU Langone Health
2014-2024
British Columbia Children's Hospital
2023
Hospital for Sick Children
2023
HRL Laboratories (United States)
2016-2022
University of Maryland, College Park
2017-2021
Athinoula A. Martinos Center for Biomedical Imaging
2021
University of California, Los Angeles
2007-2020
First-pass cardiac perfusion MRI is a natural candidate for compressed sensing acceleration since its representation in the combined temporal Fourier and spatial domain sparse required incoherence can be effectively accomplished by k-t random undersampling. However, number of samples practice (three to five times coefficients) limits alone. Parallel imaging may also used accelerate MRI, with factors ultimately limited noise amplification. In this work, parallel are merging SPARSE technique...
: To compare free-breathing radially sampled 3D fat suppressed T1-weighted gradient-echo acquisitions (radial volumetric interpolated breath-hold examination [VIBE]) with (BH) and conventional (rectilinearly k-space) VIBE for postcontrast imaging of the liver.: Eighteen consecutive patients referred clinically indicated liver magnetic resonance were imaged at 3 T. Three minutes after a single dose gadolinium contrast injection, radial VIBE, BH 4 averages acquired in random order matching...
A breath-hold two-dimensional cine magnetic resonance (MR) pulse sequence based on displacement encoding with stimulated echoes (DENSE) for quantitative myocardial motion tracking was developed and evaluated. In the sequence, complementary spatial modulation of magnetization used time-independent artifact suppression, echo-planar imaging rapid data sampling. Twelve healthy volunteers underwent DENSE MR imaging, six them also conventional tagging. The circumferential shortening component...
In MRI, the transmit radiofrequency field (B(1)(+)) inhomogeneity can lead to signal intensity variations and quantitative measurement errors. By independently mapping local B(1)(+) variation, radiofrequency-related be corrected for. this study, we present a new fast method using slice-selective preconditioning pulse. Immediately after applying pulse, turbo low-angle-shot imaging sequence with centric k-space reordering is performed capture residual longitudinal magnetization left behind by...
The purpose of this study was to validate the utility dual-source dual-energy MDCT in quantifying iodine concentration a phantom and renal masses.A series tubes containing solutions varying were imaged with MDCT. Iodine calculated compared known concentration. Single-phase contrast-enhanced data on 15 patients lesions then assessed independently by two readers. Dual-energy postprocessing used generate iodine-only images. Regions interest placed image over lesion and, as reference, aorta, for...
The purpose of this study was to determine whether the conspicuity malignant tumors pancreas at dual-source dual-energy CT is better with 80-kVp acquisition than 120-kVp simulated a weighted average.Fifteen patients pancreatic adenocarcinoma underwent contrast-enhanced CT. abdominal diameter all 35 cm or less. Data were reconstructed as average 140- and acquisitions, simulating 120 kVp, pure data set. A region-of-interest cursor placed within tumor adjacent normal parenchyma, attenuation...
To retrospectively compare quantitative and qualitative methods of assessing magnetic resonance (MR) imaging contrast enhancement as the basis for diagnosing renal malignancy.MR was performed by using a gadolinium-enhanced breath-hold fat-suppressed three-dimensional T1-weighted gradient-echo sequence in 71 patients (48 men 23 women; mean age, 62 years; age range, 26-87 years) with 93 lesions which pathologic correlation available. For measurements enhancement, relative increase signal...
PURPOSE: To retrospectively assess the importance and imaging appearance of small (≤20 mm in diameter) hepatic arterial phase–enhancing (HAPE) lesions that are occult during portal and/or equilibrium phases at unenhanced T1- T2-weighted magnetic resonance (MR) to determine gross pathologic diagnosis with whole-liver explant comparison. MATERIALS AND METHODS: This retrospective study was approved by institutional review board compliant HIPPA. Forty-six patients cirrhosis who underwent MR...
To retrospectively assess the usefulness of contrast material-enhanced T1-weighted magnetic resonance (MR) imaging alone and with T2-weighted MR in diagnosis hepatocellular carcinoma (HCC).A waiver informed consent institutional review board approval for this retrospective study were granted. The was HIPAA compliant. Twenty-eight men (mean age, 49 years; range, 23-70 years) 10 women 53 42-72 cirrhosis underwent contrast-enhanced at 1.5 T within 90 days liver transplantation. Three readers...
The purpose of this study is to compare the diagnostic accuracy liver apparent diffusion coefficient (ADC) versus normalized ADC using spleen as a reference organ for diagnosis fibrosis and cirrhosis.Fifty-six patients, 34 with disease 22 control subjects, were assessed breath-hold single-shot echo-planar diffusion-weighted imaging b values 0, 50, 500 s/mm(2). Liver (defined ratio ADC) compared between patients stratified by stage. Receiver operating characteristic (ROC) analysis was used...
Abstract Phase‐contrast (PC) cine MRI is a promising method for assessment of pathologic hemodynamics, including cardiovascular and hepatoportal vascular dynamics, but its low data acquisition efficiency limits the achievable spatial temporal resolutions within clinically acceptable breath‐hold durations. We propose to accelerate PC using an approach which combines compressed sensing parallel imaging ( k‐t SPARSE‐SENSE). validated proposed 6‐fold accelerated against 3‐fold with (generalized...
We analyze how the performance of a quantum-repeater network depends on protocol employed to distribute entanglement, and we find that choice repeater-to-repeater link has profound impact communication rate as function hardware parameters. develop numerical simulations quantum networks using different protocols, where repeater is modeled in terms key parameters, such photon generation collection efficiency. These parameters are motivated by recent experimental demonstrations dots, trapped...
Abstract Cardiac T 2 mapping is a promising method for quantitative assessment of myocardial edema and iron overload. We have developed new multiecho fast spin echo (ME‐FSE) pulse sequence breath‐hold with acceptable spatial resolution. propose to further accelerate this ME‐FSE using k ‐ t focal underdetermined system solver adapted framework that uses both compressed sensing parallel imaging (e.g., sensitivity encoding) achieve higher imaged 12 control subjects in midventricular short‐axis...
OBJECTIVE. The purpose of this study is to report unanticipated lung base findings on abdominal CT in 23 patients concerning for coronavirus disease (COVID-19). In these patients, who were not previously suspected having COVID-19, pain was the most common indication (n = 19), and 11 had no extrapulmonary findings. Seventeen underwent polymerase chain reaction testing, which returned positive results all 17.
We present the demonstration of two novel chip-scale FMCW LiDAR optical engines in which all photonic components, including laser sources, were integrated on single silicon chips. Using first chip design, with an distributed Bragg reflector and grating couplers as input/output ports for receive/transmit light, we demonstrated a maximum range 28 m limited by transmit light output power 2 mW. further 75 using second architecture having on-chip sampled master amplifier local oscillator was...
The spin of an electron in a self-assembled InAs/GaAs quantum dot molecule is optically prepared and measured through the trion triplet states. A longitudinal magnetic field used to tune two states into resonance, forming superposition state asymmetric exchange. As result, spin-flip Raman transitions can be for optical initialization, while separate enable cycling nondestructive measurement. With two-laser transmission spectroscopy we demonstrate both operations simultaneously, something not...
Purpose To develop an arrhythmia‐insensitive rapid (AIR) cardiac T 1 mapping pulse sequence for quantification of diffuse fibrosis. Methods An was developed based on saturation recovery weighting, which is inherently insensitive to heart rate and rhythm, two single‐shot balanced steady‐state free precession image acquisitions with centric k‐space ordering, where calculation 2 effects. Its performance against conventional inversion (i.e., MOLLI) compared. Phantom experiments ( ranging from...
We describe the findings of contrast-enhanced gated cardiac CT in 15 patients with 23 incidentally noted ventricular diverticula.Cardiac diverticula most commonly occur left ventricle but have been reported to all chambers heart. Despite reports their rare occurrence, are fairly common undergoing MDCT angiography.