A reconstruction of the ultrasonic scattered fields in the zone near the scatter constitutes an image of the scatterer or flaw. In a real case the reconstruction zone may contain more than one distinct scatterer and accordingly the entire group form the image. At a remote location the scattered fields form a complicated diffraction pattern which will yield the image if operated on by a suitable...

of soil were evaluated. The current study will describe the imaging system and present preliminary images produced from data collected from a soil phantom. W e have built the imaging system, which incorporates a single element source transducer and a receiver array, both obtained from the Applied Research Laboratory at Pennsylvania State University. The source and receiver array are moved toget...

In this paper, the results of imaging experinents with the interfacial region~ of representative solid material joints, ~1ng a transmission-type scanning acoustic microscope operating at 150 HHz, are reported. Voids and flaws in specially made joints as well as production-line silicon solder bonds (die bonded headera' have been detected using the transmission~de of operation of the microscope. ...

Ovarian cancer is one of the most common types of cancer among women, which often leads to death. As a result, developing new techniques for diagnosing this disease at early stages, preventing the high rate of death in women with high-risk, and minimizing the large side effects on the economy must be considered seriously by experts. For early diagnosis of this disease, it is necessary to utiliz...

MR acoustic radiation force imaging provides a promising method to monitor therapeutic ultrasound treatments. By measuring the displacement induced by the acoustic radiation force, MR acoustic radiation force imaging can locate the focal spot, without a significant temperature rise. In this work, the encoding gradient for MR acoustic radiation force imaging is optimized to achieve an enhanced a...

A three-dimensional acoustic Luneburg meta-lens has the advantage of refracting sound waves for all incident angles and focusing higher pressure compared to a two-dimensional lens. The lens made plastic with diameter 120 mm was designed thousands lattice column-shaped meta-atoms maintain its shape. lens's performance imaging were simulated measured in frequency range 5 kHz–20 kHz. omnidirection...

The present paper describes the basic principles of acoustic emission (AE) tomography. This method uses acoustic emission events as point sources and combines the usual iterative localization algorithm of AE testing with algorithms for travel time tomography like ART (algebraic reconstruction technique). The procedure is equivalent to the solution of the generalized inverse localization problem...

PURPOSE Numerical study of microwave imaging and microwave-induced thermoacoustic imaging utilizes finite difference time domain (FDTD) analysis for simulation of microwave and acoustic interaction with biological tissues, which is time consuming due to complex grid-segmentation and numerous calculations, not straightforward due to no analytical solution and physical explanation, and incompatib...

To evaluate the capability of magnetic resonance (MR) in imaging normal acoustic nerves, 12 volunteers without signs or symptoms of intracranial disease were examined using a 0.6 T superconductive system. Several spin-echo (SE) pulse sequences were tested to identify the optimal sequence for demonstration of the acoustic nerve bundle. Repetition times (TRs) varied from 300 to 2000 msec and echo...