Super resolution imaging (SRI) can beneﬁt greatly from full 3D imaging to compensate for vessel structures moving out of the image plane. Row Column Addressed (RCA) arrays can provide such 3D imaging with low-complexity probe design. A RCA probe is being designed for a rat kidney with 192 + 192 elements to ensure low sidelobes and an imaging volume of 15x15x15 mm3. The design space of such a transducer is investigated with this in mind. Capacitive micromachined ultrasonic transducer (CMUT) technology allows for new geometric shapes, including a near kerf-less zig-zag interwoven structure, which provides ﬂexibility in the design process of new RCA. This work compares the image quality of a straight element RCA array with an RCA array with an interwoven zig-zag structure by simulations, to assess the image quality of a zigzag structured RCA. The Point Spread Function (PSF) showed symmetry in both the azimuth and elevation direction. Both the straight and interwoven design had a lateral Full Width Half Maximum (FWHM) of approximately 0.6 λ, close to the ideal FWHM without apodization. The interwoven design showed a slight contrast loss over the straight desig, which was quantiﬁed withtheCysticResolution(CR).TheCRat20dBforthestraight designwas1.3 λ,comparedto1.4 λ oftheinterwovendesign.The twodesignshadcomparablePSFmetrics.Theinterwovenzig-zag structure is therefore a viable solution to meet the requirements of the rodent experiments and provides a new level of design ﬂexibility for manufacturing RCA transducer arrays.
|Title of host publication||Proceedings of 2018 IEEE International Ultrasonics Symposium|
|Number of pages||4|
|Publication status||Published - 2018|
|Event||2018 IEEE International Ultrasonics Symposium - Portopia Hotel, Kobe, Japan|
Duration: 22 Oct 2018 → 25 Oct 2018
|Conference||2018 IEEE International Ultrasonics Symposium|
|Period||22/10/2018 → 25/10/2018|