Coronary CT angiography (CTA) allows for noninvasive assessment of obstructive coronary artery disease (CAD), and is widely used for ruling out significant CAD in patients who have chest pain symptom. However, coronary calcium substantially attenuates X-ray penetration, causing “blooming” artifacts that obscure the coronary lumen on CTA. Coronary MRA has several important advantages over cardia...

The aim of this study is to propose a method for analyzing measured signal obtained from functional Near-Infrared Spectroscopy (fNIRS), which is applicable for neuroimaging studies for car drivers. We developed a signal processing method by multiresolution analysis (MRA) based on discrete wavelet transform. Statistical group analysis using Z-score is conducted after the extraction of task-relat...

BACKGROUND AND PURPOSE We have developed PC HYPRFlow, a comprehensive MRA technique that includes a whole-brain CE dynamic series followed by PC velocity-encoding, yielding a time series of high-resolution morphologic angiograms with associated velocity information. In this study, we present velocity data acquired by using the PC component of PC HYPRFlow (PC-VIPR). MATERIALS AND METHODS Ten h...

Background Cerebral arteriovenous malformations (AVMs) are congenital vascular lesions with dilated feeding arteries and draining veins without an intervening capillary bed. Treatment is recommended for most patients because of the risk of hemorrhage, which largely dependent on the imaging information available before treatment. Objective The aim was to assess the value of three-dimensional con...

BACKGROUND The aim of the current overview is to highlight the possibilities of magnetic resonance imaging (MRI) in the assessment of patients with obstructive arterial disease. The anatomic and hemodynamic aspects of the extra- and intracranial cerebral circulation were analyzed and show the importance of combining both aspects in studying cerebral hemodynamic changes. RESULTS Three levels o...

Contrast-enhanced MR-Angiography (CE-MRA) has evolved into the standard, noninvasive imaging modality for vascular imaging of the body. It allows for high spatial resolution with submilimeter voxel sizes, a large field of view and it can be acquired in 15-25s. It relies on the administration of Gd-based contrast agent of which typically 0.2mmol/kg is administered. At 3.0T, the administered dose...