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In this work, the efficacy of subharmonic aided pressure estimation to detect portal hypertension (PH; i.e., portal vein (PV) pressures > 6–10 mmHg) is investigated. A Logiq 9 ultrasound scanner (GE Healthcare, Milwaukee, WI) with a 4C probe (transmit/receive: 2.5/1.25 MHz) was configured to obtain unprocessed radiofrequency (RF) data post pulse inversion. Fourteen canines were scanned. The main...
A dual-band reflectarray antenna with a double layer, employing concentric square rings as reflecting elements, is proposed. With a procedure of the steepest decent method (SDM), the impressed phases of the reflecting elements are synthesized for the proposed antenna to radiate an optimum field pattern in the near zone of array aperture. The reflectarray antenna is designed for two frequency bands,...
In this work, the development and first-ever application of in vivo subharmonic pressure estimation to detect portal pressures and investigate portal hypertension (portal vein pressures > 12 mmHg) is presented. A modified Logiq 9 scanner (GE Healthcare, Milwaukee, WI) operating in pulse inversion subharmonic mode (ftransmit=2.5 MHz, freceive=1.25 MHz) was used to scan 14 canines. The canines received...
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