The disclosed embodiments relate to a capacitive micromachined transducers for ultrasound imaging having pressure calibrator to compensate for ultrasound image distortions caused by environmental pressure changes. In one embodiment, the disclosure relates to a method to calibrate a first ultrasound transducer of an array of ultrasound transducers for ambient pressure variation. The method includes the steps of detecting a real-time ambient pressure value； determining a pressure difference value between the detected ambient pressure value and a predetermined pressure value； and calibrating the first ultrasound transducers to compensate for the determined pressure difference.
