A Triple-frequency transducer and its Multi-frequency Image Fusion Method

It is difficult to acquire images with high resolution and deep imaging depth in the same ultrasonic image. This contradiction limits the performance of ultrasonic imaging system. Multi-frequency transducers may be a choice. By using image fusion technology, ultrasonic images corresponding to different frequencies can be fused to obtain higher quality images. In this work, an ultrasound transducer which can work at three frequencies synchronously is presented. Frequency domain models are built to assist its design and related experimental devices are fabricated. The triple-frequency transducer is with outer diameter less than 1.5mm. Pulse-echo results indicates that all its elements' waveform and bandwidth are suitable for ultrasonic imaging. A synchronously imaging is carried out on a multi-layer phantom, fusion algorithm is realized through MATLAB code. The results indicates the triple-frequency transducer can image the deeper targets with reasonable image quality.