Phase shift ultrasonic imaging method with wave number domain absorption boundary condition

• Main Authors: ZHAO PENG, ZHUO CHAOJIE, JI KAIPENG, FU, JIANZHONG
• Format: Patent
• Language: Chinese; English
• Published: 27.09.2022
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

The invention provides a phase shift ultrasonic imaging method with a frequency wavenumber domain absorption boundary condition, which comprises the following steps of: dividing a wave field into a left boundary wave field, a right boundary wave field and a middle area wave field in a frequency space domain by utilizing a designed windowing operator, and simultaneously performing Fourier transform and wave field extrapolation on the three wave fields to obtain a phase shift ultrasonic imaging result. The method comprises the following steps of: extrapolating three wave fields, superposing the three extrapolated wave fields to obtain a wave field of a current layer in a frequency wavenumber domain, and filtering in a boundary region according to the wavenumber of an incident wave to realize an effect of absorbing a pseudo reflected wave caused by a numerical boundary in a wave field extrapolation process, so that the precision of wave field reconstruction is improved; and converting the wave field of the curre