liear array focal point ultrasound

Ultrasound phased arrays for prostate treatment
The ability to move the focal point is essential, since the treatment region is larger . ment size randomization in linear arrays,23 adaptive aperture techniques,32 .
http://www.focus-surgery.com/Documents/Tan-JASA-30552001.pdf

Advantages of phased-array probes for NDT/NDI appplications
Phased arrays have several advantages over conventional ultrasonic probes that . phased-array probe allows the user to change the shape and focal point of . The figure shows the radiated field calculated for a 32-element linear array for a .
http://www.bercli.net/documentation/article_advantagesPAprobes.htm

Defect Detection with Rayleigh and Lamb Waves Generated by a ...
A phased array technique allows for electronic adjustment of the focal region, . places the focal point on the defect producing the largest ultrasonic reflection . The linear transducer array consists of a single slice of piezoelectric material .
http://www.ndt.net/article/ecndt98/steel/335/335.htm

5B-5 High-Frequency Duplex Ultrasound Imaging System for ...
Doppler imaging, using a 30 MHz 64-element linear array. The system included . The mechanical nature and fixed focal point of UBM, however, limit the further .
http://www.bioee.ee.columbia.edu/courses/upload/Bibliography/Xu_07.pdf

Modeling of nonlinear ultrasound propagation in tissue from array ...
propagation in water and in tissue from phased linear arrays and other transducers of arbitrary quasiplanar . nate at the focal region of an ultrasound beam, near-field distortions . not always be advisable from a computational point of view.
http://murphylibrary.uwlax.edu/digital/journals/JASA/JASA2003/pdfs/vol_113/iss_1/139_1.pdf

Development of High Frequency Ultrasound Transducers for ...
31. Linear Array Imaging. Array. Time-delayed electrical pulses for focusing. Focal Point. One focused ultrasound beam is used to form one image scan-line .
http://www.aapm.org/meetings/amos2/pdf/42-11937-73361-979.pdf

Reconfigurable Arrays for Portable Ultrasound
enable highly portable ultrasound platforms. . annular array beamshape is nearly equivalent to a linear array . Transmit focal points at 10 and 40 mm shown.
http://www-kyg.stanford.edu/khuriyakub/opencms/Downloads/05_Fisher_01.pdf

Large aperture Airborne Ultrasound Tactile Display using distributed ...
Oct 14, 2010 . Airborne Ultrasound Tactile Display (AUTD), which is developed in . in arbitrary point by steering the focal point using a linear phased array.
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5602795

Graham Treece - Introduction
Ultrasound image resolution is improved by electronic focusing of the beam. . many elements with appropriate delays such that they reach the desired focal point . arranged in a linear array, with different time delays such that all the pulses .
http://mi.eng.cam.ac.uk/~gmt11/teaching/proj1_11.htm

Ultrasound Bioinstrumentation Problem Assignment #1 Q1 ...
Q5: Consider an ultrasound imaging linear array probe with 32 elements, . linear array with an arbitrary size N with element width W and kerf K for a focal point .
http://www.k-space.org/ymk/ultrasound_problems1.pdf

4 Probe Selection, Machine Controls, and Equipment
. care point-of- care ultrasound: linear, curvilinear, and phased array. . close array, generating an image that comes from a point and is good for getting . based on certain gain and power settings, focal zones, frame rates, and other settings.
http://www.mhprofessional.com/downloads/products/0071604898/carmody_ch04.pdf

Synthetic Aperture Method in Ultrasound Imaging
linear array are used, the quality of images directly depends on the . ultrasound scanner with one focal point; c) ANTARES ultrasound scanner with 8 focal .
http://www.intechopen.com/download/pdf/pdfs_id/14873

Ultrasound and Fourier optics
As discussed in Section 1.2, linear propagation is governed by the linear wave equation. . the rectangular aperture of a linear array lying along the lateral coordinate axis, . This is because at the focal point, the spherically converging waves .
http://dukemil.bme.duke.edu/Ultrasound/k-space/node3.html

ULTRASOUND | Zetec, Inc. - The world leader in nondestructive ...
Zetec is your key supplier of conventional and phased array UT solutions for . Azimuthal Scanning, Depth Scanning, Linear Scanning . The result of this process is an a-scan that emphasizes the response from the desired focal point.
http://www.zetec.com/technology/ultrasound/

State-of-the-art in two-dimensional ultrasonic transducer
Each element beam forms around its central ray; all central rays cross the axis at the focal point ofthe lens. With a linear array, the beams form a sector as .
http://link.aip.org/link/?MPHYA6/3/312/1

Energy-based adaptive focusing of waves: application to ...
linear transmit/receive array through a real aberrating layer. The array is used . If an aberrator is placed between the focal point and the ultrasonic array the p0 .
http://hal-espci.archives-ouvertes.fr/docs/00/54/25/12/PDF/inserm-00542512_edited.pdf

Development and animal experiment of variable focusing HIFU ...
of 48 elements 3.6MHz linear array therapy transducers with cylindrical acoustic . focal length of high intensity ultrasound irradiation, and a 10mm diameter . images, focal points are clearly observed to be controlled from 30mm to 60mm. ? ? .
http://www.focus-surgery.com/Research/PhasedArrayNEDO_ISTU32003.pdf

Synthetic Transmit Aperture Method in Medical Ultrasonic Imaging
reconstructed. In experiments a 32-element linear transducer array with 0.48 mm . method; b) ANTARES ultrasound scanner with one focal point; c) ANTARES .
http://www.waset.org/journals/waset/v64/v64-52.pdf

A 63 element 1.75 dimensional ultrasound phased array for the ...
Phased arrays overcome this problem by electrically steering the focal point from . Another experimental design was a 62 × 1, linear array (75 × 15 mm2) with a .
http://www.biomedcentral.com/1475-925X/4/39