title: [Effects of a high-pass filter on the Doppler blood flow signal].
abstract: A high-pass filter is used to remove the large signals scattered or reflected from stationary and slow moving objects in many clinical CW Doppler units. theoretical results are presented that such a filter will lead to overestimate of the mean velocity of Doppler blood flow. As for different frequency signals, high-pass filter have different amplitudes and phase responses, consequently, nonlinear phase shift is produced. It is proved by computer experiment that nonlinear phase shift caused by high-pass filter hardly has any effects on Doppler flow power spectrum if the high-pass filter does not affect the amplitudes of signals.
authors.affiliation: Dept of Biomedical Engineering, Xi'an Jiaotong University.
authors.forename: Y
authors.initials: Y
authors.lastname: Wen
authors.forename: M
authors.initials: M
authors.lastname: Qian
authors.forename: X
authors.initials: X
authors.lastname: Gong
authors.forename: B
authors.initials: B
authors.lastname: Zhen
authors.forename: M
authors.initials: M
authors.lastname: Wan
mesh_terms: D001783:Blood Flow Velocity; D003198:Computer Simulation; D004582:Electronics, Medical; D008433:Mathematics; D018608:Ultrasonography, Doppler