Development of Single‐Fiber Piezocomposite Transducers for 3‐D Ultrasound Computer Tomography

Abstract

Ultrasound Computer Tomography (USCT) medical imaging is a promising approach for early detection of breast cancer. At Karlsruhe Institute of Technology (KIT) a 3‐D USCT system is developed. The region‐of‐interest (ROI) of 10 × 10 × 10 cm3 volume is surrounded by a aperture of 2014 semi‐spherical positioned ultrasound transducers. Results from a first patient study reveals the requirement of a significantly increased ROI to cover bodily variations. Design considerations and simulations show a demand for circular transducers with a diameter of ca. 500 µm, increasing the opening angle of the transducers to ca. 60°. Piezofiber composite technology is predestinated to simply provide circular transducers of the required dimensions. Moreover, piezocomposites based on single PZT (lead zirconate titanate Pb[ZrxTi1‐x]O3) fibers enable a cost‐effective and series‐production alternative to currently used dice‐and‐fill composites. A transducer design is presented which utilizes individually arranged single piezoceramic fibers with 460 μm in diameter within piezocomposite discs. As a result, fibers are independently addressable as single transducer elements allowing for the desired transducer arrangement. The electrical performance of each piezoceramic fiber is determined proofing a strong dependence both of the coupling coefficient and the resonance frequency from the transducer thickness. In further processing, the piezocomposite discs are connected to printed circuits, integrated into a cylindrical housing, and backfilled with polyurethane. Ultrasound characteristics such as sound pressure and opening angle are evaluated quantitatively. The results show that the transducer opening angles lie in the expected range, that the desired center frequency is achieved and that the bandwidth could be preserved compared to former dice‐and‐fill transducers.

Model-Guided Manufacturing of Transducer Arrays Based on Single-Fibre Piezocomposites

“…Each disc contains 17 fibres with a fibre diameter of 450 µm. The chosen dimensions were previously evaluated to optimise the emission characteristics [10]. The fibres are pseudo-randomly distributed on the disc.…”

“…In addition, a more random transducer distribution in the aperture is desirable to reduce imaging artefacts. These considerations led to a new transducer array design based on single-fibre piezocomposites [10].…”

“…Besides higher electro-mechanical coupling and lower acoustic impedance [11,12], the fibres can be arbitrary placed in the composite [13]. In addition, the round shape offers superior acoustic emission characteristics for our unfocused imaging approach [10].…”

Ultrasound Systems for Biometric Recognition

“…With respect to classical piezoceramic materials, piezocomposites provide in general higher energy conversion efficiency and larger bandwidth. Despite of their well-established use, an intense research activity on this kind of transducer is still carried out [43,44,45].…”

Method to Extract Frequency Dependent Material Attenuation for Improved Transducer Models

“…The requirements emanating from the applied image reconstruction algorithms resulted in a special transducer array design, schematically shown in Fig. 1 [5], [6]. There, 18 piezoceramic fibers with a diameter of 0.46 mm and a thickness of 0.6 mm are embedded in a filler material.…”