Beamforming for 3D Transesophageal Echocardiography
Bundelvorming voor 3D transoesofagale echocardiografie
In this thesis, we study beamforming techniques that offer opportunities for 3D transesophageal echocardiography imaging, especially to achieve higher frame rates. In 3D TEE with a matrix transducer, two main challenges are to connect a large number of elements to a standard ultrasound system and to achieve a high volume rate (>200 Hz). We develop a prototype miniaturized matrix transducer for pediatric patients with micro-beamforming to reduce the channel count. Initially, we propose two dual stage beamforming techniques for 1D arrays to produce high-quality images with reduced channel count: one using fixed focused receive and another with a simple summation in receive (no delays). Because of their inapplicability to the prototype transducer, we propose multiline 3D ultrasound beamforming schemes that utilize the micro-beamforming capabilities. The proposed beamforming schemes use an angle-weighted combination of the neighboring overlapping sub-volumes to suppress the crossover artifacts that are typical for parallel beamforming and produce high-quality images at a high volume rate (~300 Hz). A similar beamforming scheme adapted for a newly designed prototype matrix adult TEE probe is used for in vivo 3D imaging of the heart of a healthy adult pig to produce good quality 3D images at a high frame rate. The proposed 3D beamforming scheme can easily be adapted for matrix probes with micro-beamforming capabilities to produce good quality volume images at a high volume rate, even for a very different layout of the transmit and receive arrays.
|Keywords||Transesophageal echocardiography (TEE), matrix transducer, pediatric TEE, sub-array beamforming, parallel beamforming, volumetric ultrasound imaging, sequential beamforming, phased array imaging, synthetic aperture, ultrasound front-end electronics|
|Promotor||N. de Jong (Nico) , A.F.W. Steen (Antonius F.W.) , J.G. Bosch (Hans) , H.J. Vos (Rik)|
|Publisher||Erasmus University Rotterdam|
|Note||For copyright reasons there is a partial embargo for this dissertation|
Bera, D. (2018, June 12). Beamforming for 3D Transesophageal Echocardiography. Erasmus University Rotterdam. Retrieved from http://hdl.handle.net/1765/105966