point response of a linear pulse - echo imaging system with gaussian transducer

Pulse - Echo Shear Wave Transducer

Type and size are the most important defect characteristics that need to oe determined for reliable prediction of the remaining service lifetime of a defective structure or part. The analytical and supporting experimental results presented in this paper concern a universal ultrasonic defect-identificationand-subsequent-sizing method. The conceived satellite-pulse technique (SPT) is based on the...

Near Real Time Ultrasonic Pulse Echo Holographic Imaging System

Portable polarimetric underwater imaging system with a linear response

Polarized light plays an important role in the underwater environment. Light that is scattered within the water is partially polarized. Biological and artificial systems can exploit this phenomenon. We aim to utilize this phenomenon in a new generation of underwater imaging systems in order to partially compensate for the loss of color and visibility. In order to obtain quantitative measurement...

Enhanced resolution pulse-echo imaging with stabilized pulses.

Many pulse-echo imaging systems use focused beams to improve lateral resolution. The beam width is determined by the choice of source and apodization function, the frequency, and the physics of focusing. Postprocessing strategies to improve lateral resolution can be limited by the need for conditioning the mathematics of inverse filtering, due to instabilities. We present an analysis that defin...

A Filter-Based Pulse-Echo Coded-Excitation System for Real-Time Cardiac Imaging

A new filter-breed approach to pulse-echo imaging capable of parallel processing of multiple image lines has been developed. A major application of this approach is in true real-time 3D imaging, e.g., in cardiac imaging. The new approach utilizes a set of coded waveforms on transmit and conventional beamforming on receive. The transmitted codes produce a coded wavefront in the region of interes...

The diagnosis of herniated intervertebral disks with MR imaging: a comparison of gradient-refocused-echo and spin-echo pulse sequences.

Axial MR images of 65 lumbar disks with herniated nucleus pulposus imaged by gradient-refocused-echo (GRE) and spin-echo (SE) MR pulse sequences of 200-400/15 with a flip angle of 15-30 degrees was selected as optimal because of its high signal-to-noise ratio and good contrast between CSF, nucleus pulposus, and bone. The GRE technique was confirmed to be more sensitive in detecting prolapsed di...