title: Development of a real-time, high-frequency ultrasound digital beamformer for high-frequency linear array transducers.
abstract: A real-time digital beamformer for high-frequency (>20 MHz) linear ultrasonic arrays has been developed. The system can handle up to 64-element linear array transducers and excite 16 channels and receive simultaneously at 100 MHz sampling frequency with 8-bit precision. Radio frequency (RF) signals are digitized, delayed, and summed through a real-time digital beamformer, which is implemented using a field programmable gate array (FPGA). Using fractional delay filters, fine delays as small as 2 ns can be implemented. A frame rate of 30 frames per second is achieved. Wire phantom (20 microm tungsten) images were obtained and -6 dB axial and lateral widths were measured. The results showed that, using a 30 MHz, 48-element array with a pitch of 100 microm produced a -6 dB width of 68 microm in the axial and 370 microm in the lateral direction at 6.4 mm range. Images from an excised rabbit eye sample also were acquired, and fine anatomical structures, such as the cornea and lens, were resolved.
authors.affiliation: Biomedical Engineering Department and NIH Transducer Resource Center, University of Southern California, Los Angeles, CA 90089, USA. changhoh@usc.edu
authors.forename: Chang-Hong
authors.initials: CH
authors.lastname: Hu
authors.forename: Xiao-Chen
authors.initials: XC
authors.lastname: Xu
authors.forename: Jonathan M
authors.initials: JM
authors.lastname: Cannata
authors.forename: Jesse T
authors.initials: JT
authors.lastname: Yen
authors.forename: K Kirk
authors.initials: KK
authors.lastname: Shung
mesh_terms: D003199:Computer Systems; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007089:Image Enhancement / Q000295:instrumentation* / Q000379:methods; D007090:Image Interpretation, Computer-Assisted / Q000295:instrumentation* / Q000379:methods; D019047:Phantoms, Imaging; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D014159:Transducers; D014463:Ultrasonography / Q000295:instrumentation* / Q000379:methods