Recursive ultrasound imaging

نویسندگان

  • Svetoslav Nikolov
  • Kim Gammelmark
چکیده

both 2D and 3D imaging. It is based on Synthetic TransThis paper presents a new imaging method, applicable for mil Aperture Focusing, but unlike previous approaches a new from a linear transducer array emit pulses one after another. frame is created after every pulse emission. The elements The same transducer element is used after Nxm emissions. For each emission the signals from the individual elements are beam-formed in parallel for all directions in the image. A new frame is created by adding the new RF lines to the RF lines from the previous frame. The RF data recorded at the previous emission with the same element are subtracted. This yields a new image after each pulse emission and can give a frame rate of e.g. 5000 imagedsec. The paper gives a derivation of the recursive imaging technique and compares simulations for fast B-mode imaging with measurements. tifacts and to make flow estimation possible. The simulations A low value of NXmt is necessary to decrease the motion arshow that for N,, = 13 the level of grating lobes is less than and flow estimation. -50 dB from the peak, which is sufficient for B-mode imaging The measurements made with an off-line experimental system having 64 transmitting channels and I receiving channel, confirmed the simulation results. A linear array with a pitch of 208.5 p m , central frequency ja, = 7.5 MHz and bandwere recorded, beam-formed and displayed as a sequence of width EW = 70% was used. The signals from 64 elements B-mode frames, using the recursive algorithm. An excitation with a central frequency fo = 5 MHz (h = 297 pm in water) The -6 dB width of the PSF is 1.056 mm at axial distance of was used to obtain the point spread function of the system. 39 mm. For a sparse synthetic transmit array with NXm = 22 the expected grating lobes from the simulations are -53 dB down from the peak value at, positioned at f 2 8 ’ . The measured level was -51 dB at f 2 7 ” from the peak. Images obtained with the experimental system are comThe application of the method for 3D real-time imaging and pared to the simulation results for different sparse arrays. blood-velocity estimations is discussed.

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تاریخ انتشار 2016