Introduction: Coronary magnetic resonance angiography (MRA) has been performed on 3.0T to generate higher SNR compared to 1.5T. In addition, high blood-to-myocardium contrast could be achieved using the SSFP technique [1]. However, SSFP is highly sensitive to field inhomogeneities. In particular, signal nulls occur every 1/TR in resonance frequency, producing “banding” artifacts in images. With...

A two-step approach to enhance the resolution of remote sensing thermal infrared (TIR) images is proposed in this paper. For difference in imaging principles between TIR image and optical images, traditional image fusion techniques, such as component substation and MRA methods will not be proper. In our study, we use Extreme Learning Machine (ELM) to regress the relationship between TIR image a...

STUDY OBJECTIVES The functional impact of pulmonary vein (PV) stenosis on pulmonary perfusion after radiofrequency ablation (RFA) for atrial fibrillation (AF) has not been systematically evaluated previously. Therefore, we correlated magnetic resonance (MR) pulmonary perfusion imaging with single-photon emission CT (SPECT) perfusion and with the degree of PV stenosis (PVS) apparent on MR angiog...

PURPOSE To determine whether contrast-enhanced 3D MR angiography (CE MRA) could replace digital subtraction angiography (DSA) for the evaluation of atherosclerotic peripheral vascular disease of the lower leg and foot. MATERIAL AND METHODS Thirty-five patients with symptoms of atherosclerotic disease of the leg were examined prospectively with CE MRA of the foot and the lower legs as well as ...

Methods Seventy-six prospective patients with known or suspicion of thoracic aortic disease underwent MRA at 1.5T using i) native 3D SSFP MRA with ECG and navigator gating and high isotropic spatial resolution (1.3 × 1.3 × 1.3 mm 3) and ii) conventional contrast-enhanced ECG-gated gradient echo 3D MRA (1.3 × 0.8 × 1.8 mm 3). Datasets were compared at 9 aortic levels regarding image quality (sco...

INTRODUCTION Vascular diseases typically affect the entire arterial systems, from the intracranial down to the pedal vessels. However, it is not easy to evaluate the whole-body vascular systems noninvasively within a reasonable time. Up until now, many non-contrast-enhanced MR angiography (MRA) methods have been developed based on variable principles or MR phenomena; then select the appropriate...

Abstract. These two companion papers present foundational principles of parametrics in OMG SysMLTM and their application to simulation-based design. Parametrics capabilities have been included in SysML to support integrating engineering analysis with system requirements, behavior, and structure models. This Part 2 paper walks through SysML models for a benchmark tutorial on analysis templates u...

OBJECTIVES The aim was (i) to evaluate the accuracy of equilibrium-phase high spatial resolution (EP) contrast-enhanced magnetic resonance angiography (CE-MRA) at 1.5T using a blood pool contrast agent for the preoperative evaluation of deep inferior epigastric artery perforator branches (DIEP), and (ii) to compare image quality with conventional first-pass CE-MRA. METHODS Twenty-three consec...

This paper studies the application of generalized method moments (GMM) to multi-reference alignment (MRA): problem estimating a signal from its circularly-translated and noisy copies. We begin by proving that GMM estimator maintains asymptotic optimality for statistical models with group symmetry, including MRA. Then, we conduct comprehensive numerical study show substantially outperforms class...