Non-linear Imaging sing an Experimental Synthetic Aperture Real Time Ultrasound Scanner

The Journal of the Acoustical Society of America

2014

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Synthetic aperture sequential beamforming (SASB) and tissue harmonic imaging (THI) are combined to improve the image quality of medical ultrasound imaging. The technique is evaluated in a comparative study against dynamic receive focusing (DRF). The objective is to investigate if SASB combined with THI improves the image quality compared to DRF-THI. The major benefit of SASB is a reduced bandwidth between the probe and processing unit. A BK Medical 2202 Ultraview ultrasound scanner was used to acquire beamformed RF data for offline evaluation. The acquisition was made interleaved between methods, and data were recorded with and without pulse inversion for tissue harmonic imaging. Data were acquired using a Sound Technology 192 element convex array transducer from both a wire phantom and a tissue mimicking phantom to investigate spatial resolution and penetration. In vivo scans were also performed for a visual comparison. The spatial resolution for SASB-THI is on average 19% better than DRI-THI, and the investigation of penetration showed equally good signal-to-noise ratio. In vivo B-mode scans were made and compared. The comparison showed that SASB-THI reduces the artifact and noise interference and improves image contrast and spatial resolution.

Section: Methodsmentioning

confidence: 99%

Tissue harmonic synthetic aperture ultrasound imaging

Hemmsen

Rasmussen

The Journal of the Acoustical Society of America

2014

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“…This scanner is capable of performing PI and 2nd harmonic imaging [9] and is therefore also capable of performing 3rd harmonic imaging. SARUS is used to record raw channel data from a commercially available 192 element convex transducer (BK8820e).…”

Section: Methodsmentioning

confidence: 99%

Third harmonic imaging using pulse inversion

Rasmussen

2011 IEEE International Ultrasonics Symposium

2011

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Abstract-The pulse inversion (PI) technique can be utilized to separate and enhance harmonic components of a waveform for tissue harmonic imaging. While most ultrasound systems can perform pulse inversion, only few image the 3rd harmonic component. PI pulse subtraction can isolate and enhance the 3rd harmonic component for imaging on any ultrasound system capable of PI. PI was used to perform 3rd harmonic Bmode scans of a water-filled wire phantom on an experimental ultrasound system. The 3rd harmonic scans were compared to fundamental and 2nd harmonic scans on the same system. The 3rd harmonic image showed a 46% improvement in the lateral FWHM resolution compared to fundamental B-mode imaging at 75 mm depth and a 28% improvement compared to 2nd harmonic B-mode imaging. The axial FWHM resolution was improved by 35% and 30% for 3rd harmonic imaging compared to fundamental and 2nd harmonic imaging respectively. The improvements in spatial resolution and the fact that PI can isolate the 3rd harmonic suggest that it is advantageous to implement 3rd harmonic imaging on ultrasound systems capable of PI.

SARUS: A synthetic aperture real-time ultrasound system

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

Holten-Lund

Nilsson

et al. 2013

224

188

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