Pan-sharpening methods are commonly used to synthesize multispectral and panchromatic images. Selecting an appropriate algorithm that maintains the spectral spatial information content of input images is a challenging task. This review paper investigates wide range algorithms, including 41 methods. For this purpose, were categorized as Component Substitution (CS-based), Multi-Resolution Analysi...

The combination of 3T and parallel-acquisition techniques holds promise for improved performance of contrast-enhanced MR angiography (MRA), in terms of speed, spatial resolution, and coverage. We present a comparison of 2 MRA techniques, including time-of-flight (TOF) and contrast-enhanced MRA, for detection and evaluation of intracranial aneurysms. Our results show that contrast-enhanced MRA w...

BACKGROUND AND PURPOSE Different studies already demonstrated the benefits of 7T for precontrast TOF-MRA in the visualization of intracranial small vessels. The aim of this study was to assess the performance of high-resolution 7T TOF-MRA after the administration of a gadolinium-based contrast agent in visualizing intracranial perforating arteries. MATERIALS AND METHODS Ten consecutive patien...

J. H. Maki, G. J. Wilson, R. M. Hoogeveen, W. B. Eubank, D. J. Glickerman, J. Whitnah, M. B. Mathis, C. E. Hayes Radiology, Puget Sound VAHCS, Seattle, WA, United States, Radiology, University of Washington, Seattle, WA, United States, Philips Medical, Cleveland, OH, United States, Philips Medical, Best, Netherlands Introduction Evaluation of the peripheral arterial vasculature represents one o...

Recent refinements of magnetic resonance angiography (MRA) allow imaging vessels as small as the septocutaneous perforators (< or = 1 to 2 mm diameter), but a Medline review reveals no report of septocutaneous vessel imaging for free flap surgery. Challenges in fibula free flap preparation include knowledge of: (1) tibioperoneal anatomy, (2) the positions of the perforator vessels on the perone...

Purpose. The aim of the present work was to test the feasibility of the time-resolved MR-angiography (TWIST-MRA) of cervical arteries using double bolus injection. Material and Methods. TWIST-MRA with a temporal resolution of 8.4 seconds for each frame and a spatial resolution with a voxel size of 0.61 × 0.58 × 0.8 mm(3) was performed in 24 patients. A biphasic bolus injection protocol was used...

P. Aksit, V. B. Ho, M. L. Hood, P. L. Choyke, M. B. Montequin, T. K. Foo Applied Science Laboratory East, GE Medical Systems, Baltimore, MD, United States, Department of Radiology, Uniformed Services University of the Health Sciences, Bethesda, MD, United States, Department of Radiology, National Institutes of Health, Bethesda, MD, United States Introduction: Contrast media travel times can var...

Gadolinium(Gd)-enhanced three-dimensional (3D) magnetic resonance angiography (MRA) is a newer technique that provides high resolution data rapidly for depiction of both arteries and veins throughout the body.1 Improvements in gradient technology now allow an entire volume of 3D-Gd-enhanced MRA to be performed at 4 second intervals. It is now possible to acquire several volumes of high temporal...

A method for embedded object detection with radar echo data by means of wavelet analysis of MRA: MultiResolution Analysis, in particular, three dimensional wavelet transformations is proposed. In order to improve embedded object detecting capability, not only one dimensional radar echo data but also three dimensional data are used. Through a comparison between one dimensional edge detection wit...