A nanosecond pulse electric field induced thermoacoustic signal processing method and system
A nanosecond pulse, electric field-induced technology, applied in sonic diagnosis, infrasonic diagnosis, ultrasonic/sonic/infrasonic diagnosis, etc., can solve problems such as inability to obtain information deeply inside, reduce equipment cost and complexity, and achieve large penetration depth , Easy and fast imaging effect
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Embodiment 1
[0049] A nanosecond pulsed electric field-induced thermoacoustic signal processing method, such as figure 1 As shown, insulating oil is filled between the target body and the plates of the two electrodes A and B, and a pulse voltage U(t) with a nanosecond width is applied to the electrodes, and the acoustic signal is collected by an ultrasonic probe; the finite element method is used to solve the target body Then solve the electric field strength and current density in the target body; because the electric field strength and current density in the target body are related to the conductivity distribution of the target body, and the thermal function of the target body is related to its conductivity distribution, and finally obtain the target body The distribution relationship between acoustic signal and conductivity.
[0050] The specific processing steps include:
[0051] Place the target body in the target area, fill the insulating oil with a conductivity of 0 between the tar...
Embodiment 2
[0070] Using the nanosecond pulse thermoacoustic imaging method described in Example 1, two simulation models, a simple model and a complex model, were respectively established for simulation analysis.
[0071] Specifically, the simulation model established in this embodiment is as follows image 3 as shown, image 3 (a) and 3(b) are simple and complex models respectively:
[0072] image 3 (a) and image 3 (b) The surrounding circle simulates normal tissue, its radius is 0.08m, the center of the circle is (0.06,0.06)m, and the conductivity is 1S / m. The voltage U(t)=100g(t)V applied by the upper plate, Where b and c are system constants, set to b=5*10 -7 ,c=1*10 -7 , the lower plate is grounded;
[0073] image 3 (a) The inner square simulates the abnormal tissue, the center position is (0.06,0.06)m, the side length is 0.03m, and the conductivity is 5S / m.
[0074] image 3 (b) The inner ellipse and square simulate abnormal tissue, the center of the ellipse is (0.03,0...
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