Technology – Multi-Frequency Transducers
Many imaging techniques used in the Dayton Lab utilize dual-frequency technology, operating at two separate frequencies for transmission and reception of acoustic waves. The difference between these frequencies is often too great to be contained within the capabilities of a single ultrasound transducer, necessitating the use of special dual-frequency devices. Examples of such devices currently used in the Dayton Lab include dual-element custom transducers for acoustic angiography, miniature dual-frequency transducers for intravascular ultrasound imaging, capacitive micromachined ultrasound transducers for unique multi-pulse imaging, and combinations of commercial transducers to suit specific research needs. Most of these devices are applied for superharmonic (transmit low, receive high) imaging, but subharmonic (transmit high, receive low) imaging applications exist as well, such as activation of phase change contrast agents. These dual-frequency technologies have been featured in published and ongoing research, and the potential of such devices and applications for clinical translation is actively being explored.