The invention provides an imaging system, method and an ultrasonic imaging system. The imaging system includes: a laser emitting apparatus, a laser detection apparatus and an ultrasonic device. The laser detection apparatus is intended for detecting laser transmitted by the laser emitting apparatus so as to acquire a laser detection signal. The ultrasonic device includes an ultrasonic probe, an emitting/receiving circuit and a processor. The emitting/receiving circuit is intended for, when the imaging system is in a first working state, controlling the ultrasonic probe to receive an opto-acoustic signal which is generated by a tested body tissue which is radiated by the laser. The processor is intended for, when the imaging system is in the first working state, generating a control signal, transmitting a control signal to the laser emitting apparatus so as to enable the laser emitting apparatus to work under the control signal. And at the same time, the processor is also intended for based on the laser detection signal, processing the opto-acoustic signal so as to remove a noise signal from the opto-acoustic signal which is obtained by the ultrasonic probe and increase the accuracy of a reconstructed image.