Investigation of acoustic fields of transducers is the important stage of development of techniques and means of ultrasonic testing.
In this paper, the "effective" refractive index for focused acoustic fields was developed, through numerical simulation and experiments, the feasibility of the optical method in measuring acoustic fields of focused transducers was proved.
Lead magnesium niobate ceramics (PMN) are promising materials for application in the field of high power transducers.
With US guidance, the field of the diagnostic transducer is overlying and arranged parallel to the therapeutic source and offers real-time visualization of the targeted volume [ 27].
An informal review of data from cadaver dissections suggests that over 60% of muscles in the upper and lower limbs have optimal lengths longer than the field-of-view of standard ultrasound transducers.
The chapter also elaborates the basics of transducers, sensors, field wiring and communications cabling, and signal conditioning.
Considering the unevenness of the testing regions, uneven coating of the coupling agent and variation in the placement of transducers during field ultrasonic, there may be some errors in the test results.
Based on the technological advances in the field of US including modern transducers and image optimisation techniques, it is expected that current US devices may provide improved accuracy for diagnosing carotid ulceration [72].
The fractional breast volume coverage, defined as the percentage volume in the transducer field of view that is imaged with clinically acceptable quality, is improved from 59% in both superior and inferior single-sided imaging to 89% in dual-sided imaging.
Because the field of view of the transducer is continuously changing, performed movements need to be referred to a relative frame of reference.
