Column-based micro-beamformer for improved 2D beamforming using a matrix array transducer. - Hyun gil Kang; Sua Bae; Pilsu Kim; Jiwon Park; Gunho Lee; Woojin Jung; Minsuk Park; Kang-sik Kim; Wooyoul Lee; Tai-Kyong Song (BioCAS, 2015)