This paper investigates the potential use of airborne ultrasonic phased arrays for imaging in outdoor environments as a means of overcoming the limitations experienced by kinect sensors, which may fail to work in the outdoor environments due to the oversaturation of the infrared photo diodes. Ultrasonic phased arrays have been well studied for static media, yet there appears to be no comparable...

PURPOSE To compare endoanal ultrasonography (US), endoanal magnetic resonance (MR) imaging, and phased-array MR imaging for anal sphincter muscle measurement. MATERIALS AND METHODS Sixty healthy volunteers underwent 1.5-T phased-array MR, endoanal MR, and endoanal US examinations. Sphincter muscle thicknesses were measured. Measurement reliability was analyzed, and correlations among the imag...

1. INTRODUCTION * Sponsored by multi-government agencies and especially by the US Navy, a phased-array weather radar has been constructed at NSSL Norman Oklahoma. This establishes the first National Weather Radar Testbed (NWRT) equipped with the solid-state phased-array antenna (Forsyth et al. 2005). One of the important and yet very challenging research goals at NWRT is to optimally design and...

Phased-array systems, a special case of multiple-input-multiple-output (MIMO) systems, take advantage of spatial directivity and array gain to increase spectral efficiency. Implementing a phased-array system at high frequency in a commercial silicon process technology presents several challenges. This thesis focuses on the architectural and circuit-level trade-offs involved in the design of the...

Parallel imaging using sophisticated receiver coils has improved the clinical feasibility of magnetic resonance coronary angiography (MRCA). These techniques, however, are not readily available outside advanced imaging centers. Our custom-made 2-element phased array coil is readily and inexpensively assembled to address this limitation and enable the widespread application of MRCA. The 2-elemen...

The aim of the present study was to investigate the clinical efficacy of phased joint intervention [percutaneous transhepatic variceal embolization (PTVE) + phased partial splenic embolization (PSE)] in patients with portal hypertension complicated by esophageal variceal bleeding and hypersplenism and the effect of this intervention on interleukin-35 (IL-35)/IL-17 expression. A review of 53 pat...

Novel acousto-optic processors for control and signal processing in phased-array antennas are presented. These processors can operate in both the antenna transmit and receive modes. An experimental acousto-optic processor is demonstrated in the laboratory. This optical technique replaces all the phase-shifting devices required in electronically controlled phased-array antennas.

In this paper, various developments like advancement in T/R modules, impact of usage of COTS components and sub-array concept in the realization of active phased array Radar are discussed. Concept of dense network of small range Radar is also presented. At the end, modifications required in Phased Array Radar to realize MPAR are given.

We report on the first demonstration of dynamic beam steering using a scanning lens phased array. A array relies combination mechanical and electrical phase shifting to dynamically steer high-gain beyond grating-lobe free region sparse These two concepts have been demonstrated separately in past, here we present, for time, prototype where active are combined. For this purpose, developed 4x1 at ...

Background. Recent advances in miniaturization of phased-array and mechanical ultrasound devices have resulted in exploration of alternative approaches to cardiac and vascular imaging in the form of transesophageal or intravascular imaging. Preliminary efforts in adapting phased-array endoscopes designed for transesophageal use to a transvascular approach have used full-sized phased-array devic...