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3D Temperature Dependence of Ultrasonic Backscattered Energy in3D Temperature Dependence of Ultrasonic Backscattered Energy in Images Compensated for Apparent Tissue MotionImages Compensated for Apparent Tissue Motion
 

Summary: 3D Temperature Dependence of Ultrasonic Backscattered Energy in3D Temperature Dependence of Ultrasonic Backscattered Energy in
Images Compensated for Apparent Tissue MotionImages Compensated for Apparent Tissue Motion
AbstractAbstract
Ultrasound is an attractive modality for monitoring temperature during
heating of tumors to therapeutic levels. Previously, we predicted
monotonic changes in ultrasonic backscattered energy (CBE) for certain
sub-wavelength scatterers. Accurate measurement of CBE requires
compensation for apparent motion of image features. We measured CBE
in 2D in motion-compensated images of four 1-cm thick samples of bovine
liver, two of turkey breast, and one of pork muscle during heating in a
water bath from 37 to 50oC. Images were formed by a Terason 2000
imager with a 7 MHz linear probe focused at 4.5 cm, the center of each
tissue specimen. Employing RF signals from the Terason 2000 (courtesy
Teratech Corp.) permitted the use of cross-correlation as a similarity
measure for automatic feature tracking with temperature. Tissue motion
in 8 image regions of each specimen was tracked from 37 to 50oC in
0.5oC steps. Maximum displacement in all specimens was about 0.5 mm
in both axial and lateral directions. Motion compensated image regions
were demodulated and smoothed. Pixel values were squared to form the
backscattered energy. We compared means of both the positive and

  

Source: Arthur, R. Martin - Department of Electrical and Systems Engineering, Washington University in St. Louis

 

Collections: Biology and Medicine; Engineering