Facial phenotypes are extensively studied in medical and biological research, serving as critical markers that potentially indicate underlying genetic traits or conditions. With the recent advancements big data, algorithms, hardware, deep facial diagnosis, which employs learning techniques to systematically examine identify signs of certain diseases conditions, has attracted significant attention gradually emerging a promising tool precision medicine. Primarily limited by scarcity data for...

Among the biomedical imaging modalities, photoacoustic computed tomography (PACT) was one of emerging hybrid techniques in recent years. In designing PACT system, a finite-bandwidth transducer is limited factors for overall performance. As target size inversely proportional to dominant frequency components generated (PA) signal, broad bandwidth desired different scales' imaging. this paper, monolithic multiband capacitive micromachined ultrasonic (CMUT) array designed and fabricated...

Abstract Intra-body Communication (IBC) employs the human body as a medium for biological signal transmission, which is emerging promising candidate communication backbone of Wireless Body Area Network (WBAN). In particular, designing implanted and wearable devices based on IBC requires careful consideration appropriate modulation schemes within limited transmit power constraints. To this end, paper analyzes channel capacity performances different in galvanic coupling IBC. First, calculated...

Capacitive micromachined ultrasonic transducers (CMUTs) have emerged as a competitive alternative to piezoelectric transducers, especially in medical ultrasound imaging and therapeutic applications, which require high output pressure. However, compared with the pressure capability of CMUTs remains be improved. In this paper, novel structure is proposed by forming an embossed vibrating membrane on CMUT cell operating collapse mode increase maximum By using beam model undamped conditions...

To effectively analyze the diffusion and accumulation of signals on surface inside human body under electrical stimulation, we used gray threshold Chinese Digital Human image dataset to segment an arm reconstruct tissue obtain its three-dimensional cloud point dataset. Finally, a semirefined digital entity model with geometric characteristics actual was constructed using reverse engineering technology. Further input current signal stimulation tDCS tACS additional analysis in transient mode...

Photoacoustic tomography (PAT) as a hybrid technology combines the high optical contrast and acoustic resolution in single imaging modality. However, most of available PAT systems cannot comprehensively or accurately characterize biological at multiple length scales due to use narrow bandwidth commercial ultrasonic transducers. In this study, we fabricated novel multi-band capacitive micromachined transducer (CMUT) array, first developed CMUT-based photoacoustic (MBPAT) system. The MBPAT...

This paper is to develop analytical models for the underwater capacitive micromachined ultrasonic transducer (CMUT) understand its large deflection effect from water pressure. To accurately model displacement profile of CMUT under pressure, Von Kármán equations and perturbation method are employed calculate membrane deformation a uniform The an annular-ring plate first applied membrane. lateral force due elongation considered in proposed model, which used profiles both conventional collapse...

To overcome limitations in existing methods for sentiment analysis of tourism reviews, the authors propose an image-text multimodal method (TBGAV). It consists three modules: image extraction, text and fusion. The extraction module employs a pre-trained VGG19 model to capture features. utilizes tiny bidirectional encoder representations from transformers (TinyBERT) model, incorporating recurrent neural network attention (BiGRU-Attention) deeper semantics. fusion dual linear approach...

Capacitive Micromachined Ultrasonic Transducer (CMUT) is a type of micro-electro-mechanical system (MEMS) device which has the advantages such as ease integration with front-end electronics and fabrication uniform arrays. The structure fundamental working principle CMUT are similar to that parallel plate capacitor. When in conventional mode, deflection profiles can be described by analytical expressions capacitance calculated thereafter. A design was proposed calculate membrane accurately...

A new method is proposed to increase the resonant frequency of a Capacitive Micromachined Ultrasonic Transducer (CMUT) device while keeping radii unchanged for devices fabricated by sacrificial release (SR) method. The CMUT cell determined properties membrane such as Young's modulus, dimensions and effective mass. Effective modulus used calculate SR supporting post structure will affect boundary conditions at edge in turn deflection together with membrane. perturbation derive solution...

Multiple Helmholtz resonance apertures are proposed to enhance the output pressure of air-coupled capacitive micromachined ultrasonic transducers (CMUTs) for non-contact ultrasound imaging applications. The methodologies defining design parameters CMUTs and resonant on membrane discussed. In comparing certain configurations with conventional CMUTs, simulation results show that a prospective improvement (up 32.1%) can be achieved.

Capacitive Micromachined Ultrasonic Transducer (CMUT) is a new type of ultrasound wave generator and detector. Analytical method intuitive to understand the mechanism physical effects through modeling CMUT. To optimize design procedures CMUT membrane undergoing large deflection, analytical model with consideration lateral force using Von Kármán equations proposed. This capable calculating profile since it includes effect force. The calculated results match well simulated maximum deflection...

An embossed capacitive micromachined ultrasonic transducer (CMUT) is a device with membrane that works in the collapse mode to improve output pressure transmission. In this paper, six-mask sacrificial release process proposed for fabricating CMUT arrays. Based on process, pattern CMUTs were firstly fabricated. By using of electroplating methods, annular patterns made nickel grown full top electrodes CMUTs. The dimensions about 3.0 µm width and 1.4 height. resonant frequencies array 6.4 MHz...

Capacitive Micromachined Ultrasonic Transducer (CMUT) is a promising ultrasonic transducer in medical diagnosis and therapeutic applications that demand high output pressure. The concept of CMUT with an annular embossed pattern on membrane working collapse mode proposed to further improve the To evaluate performance cell, both uniform cells were fabricated same die customized six-mask sacrificial release process. An nickel dimension 3 μ m × 2 (width height) was formed full top electrode...

Synthetic aperture (SA) imaging algorithm, which combines sub-aperture elements to form high resolution image, can improve image quality in vivo ultrasound image. However, large computation resource is generally required for the implementation of SA. In this paper, we propose a parallel structural design SA algorithm that be realized Field Programmable Gate Array (FPGA), so light weight and miniaturized achieved. The proposed has been validated by MATLAB was employed construct from raw data...

Capacitive micromachined ultrasonic transducer (CMUT) has shown many advantages and is an alternative to lead zirconate titanate (PZT) transducer, especially in biomedical imaging applications. Photoacoustic tomography (PAT) a developing technique that provides the information of optics ultrasound. Acceptance angle key factor PAT reconstruction. We evaluated acceptance our fabricated CMUTs commercial PZT transducers measurement results showed owned wide angles, which suggested CMUT potential...

Background: Capacitive Micromachined Ultrasonic Transducer (CMUT) is a new type of ultrasound transducer that has gained much research interest in imaging because its wider bandwidth, higher receiving sensitivity, and more likely to be integrated with an circuit (IC). The analytical solution intuitive, fast, convergent among simulation methods. membrane deflection important the CMUT performance. deformation circular under external force can described by von Kármán equations. Objective: To...

Background:: Ultrasound is widely used in the applications of underwater imaging. Capacitive micromachined ultrasonic transducer (CMUT) a promising candidate for traditional piezoelectric transducer. In ultrasound imaging, better resolutions can be achieved with higher frequency ultrasound. Therefore, CMUT array high-frequency imaging proposed this work. Methods:: Analytical methods were to calculate center water and pull-in voltage determining operating point CMUT. A finite element method...

To improve the accuracy of static membrane deflection calculation for collapse mode capacitive micromachined ultrasonic transducer (CMUT) fabricated by sacrificial release (SR) method. The beam theory was used and substrate supporting force can be modeled a coefficient to load on membrane. surrounding post bending applying elastic support boundary conditions (ESBCs) peripheral part CMUT devices have been using SR process validate this analytical analysis. Young’s modulus <inline-formula...

Background: Capacitive micromachined ultrasonic transducers (CMUTs) is a promising component of mechanical-electrical-acoustical conversion, which shows valuable applications in non-distructive testing and obstacle detection fields. In order to study the influence dimension parameters on directivity CMUTs, three-dimensional multi-physics coupling model proposed for CMUTs this paper. Methods: The combines multiple physical fields through finite element method (FEM), more efficient accurate....