The present invention relates to a method for detecting a first arriving pulse in an ultrasound transceiver computed tomography (UTCT), more particularly, to an extraction of an image index for constructing a transmission ultrasound tomograph in an ultrasound imaging system, More particularly, the present invention relates to a method for detecting a first arriving pulse transmitted through a target object (hereinafter referred to as a target object) using a Windowed Nonlinear Energy Operator (wNEO) in order to utilize the reconstructed image. The transducer includes a pulse generator for generating a pulse, a transducer for converting the pulse into an ultrasonic signal and radiating the ultrasonic signal to a target object, a receiving transducer for receiving an ultrasonic signal transmitted through the object and converting the ultrasonic signal into an analog signal, A method for detecting a first arriving pulse in a transillumination ultrasound tomograph including an ultrasonic transducer and an analog-to-digital converter for converting an analog signal provided from the receiving transducer into a digital signal and outputting the digital signal, Calculating a nonlinear energy operator based on the acquired electrical pulse sequence； convoluting the calculated nonlinear energy operator with a window function to yield a windowed nonlinear energy operator； , The calculated window function is applied to the nonlinear energy operator And detecting a first arriving pulse by applying a threshold value operator to the first ultrasound pulse. Therefore, according to the present invention, by detecting the first arriving pulse by applying the window function nonlinear energy operator, a fast calculation speed can be ensured and the detection rate can be maximized. In addition, the structure is simplified, the applicability is excellent, and it can be implemented at a low cost, which is an excellent effect in image acquisition in a transmission ultrasound tomograph.본
