Microwave-induced thermal acoustic tomography (MITAT) is an innovative technique to image biomedical tissues based on their electric properties. It has the advantages of both high contrast and spatial resolution. Image reconstruction method in MITAT always a critical issue. In this paper, CS-MITAT (CS: compressive sensing) imaging proposed. Compressive sensing (CS) recently developed sparse signal representation analysis framework which handles medical measurements using low sampling rate or...

The objectives of this study were to investigate the epidemiological characteristics and spectrum corneal primary diseases among keratoplasty patients in southern region Liaoning Province changing trends types graft materials. medical records 537 who underwent at Department Ophthalmology Dalian Third People's Hospital from 2017 2023 retrospectively analyzed. Patient demographic (age sex), disease type, type material data statistically A total during 7 years period included. average age was...

Microwave-induced thermoacoustic tomography (MITAT) is a hybrid method which constructs images with ultrasound spatial resolution while exploiting dielectric contrast at microwave frequency. It has great potential in biomedical imaging especially early breast cancer detection. The detection of stage tumor MITAT challenged by the moderate endogenous between malignant and healthy glandular tissues. In order to overcome this limitation, performance using carbon nanotubes (CNTs) as an...

Microwave induced thermo-acoustic tomography (MI-TAT) has become a keen research topic in recent years due to its great potential early breast cancer detection.A secure and accurate MI-TAT system been established.Some experiments have made demonstrate the performance of MITAT system.Based on an experiment using phantom, some quantitative features obtained.Some imaging with real human tissues are performed effectiveness clinical diagnosis.Images both high contrast fine spatial resolution...

Microwave induced thermo-acoustic tomography (MI-TAT) has great potential in early breast cancer detection because it utilizes the advantages of both microwave imaging and ultrasound imaging.In this paper, a fast efficient simulation approach based on hybrid method which combines finite integration time domain (FITD) pseudo-spectral (PSTD) is developed.By using approach, energy deposition biology tissue illuminated by electromagnetic fields can be accurately simulated.Meanwhile, acoustic...

Aiming to efficiently overcome the acoustic refraction and accurately reconstruct microwave absorption properties in heterogeneous tissue, an iterative reconstruction method is proposed for microwave-induced thermo-acoustic tomography (MITAT) system.Most current imaging methods MITAT assume that sound velocity (SV) distribution obeys a simple Gaussian distribution.In real problem, biological tissue may have several different inclusions with SV this case, must be taken into account.The...

Carbohydrate recognition plays an important role in the development of normal projections sensory afferent neurons leech CNS. Four different carbohydrate epitopes are expressed by afferents on their 130 kDa surface proteins: all share a common epitope (CE0) that helps them to enter and project diffusely across synaptic neuropil; restricted expression three other (CE1, CE2, CE3) serves distinguish subsets afferents. We examined defined subset lip, skin, gut, established CE1, CE3 define...

An iterative reconstruction method has been previously reported by the authors of this paper. However, was demonstrated solely using numerical simulations. It is essential to apply practice conditions. The objective work validate capability for reducing effects acoustic heterogeneity with experimental data in microwave induced thermoacoustic tomography.Most existing methods need combine ultrasonic measurement technology quantitatively measure velocity distribution heterogeneity, which...

.We present a butterfly-compressed representation of the Hadamard–Babich (HB) ansatz for Green's function high-frequency Helmholtz equation in smooth inhomogeneous media. For computational domain discretized with \(N_v\) discretization cells, proposed algorithm first solves and tabulates phase HB coefficients via eikonal transport equations observation points point sources located at Chebyshev nodes using set much coarser computation grids, then butterfly compresses resulting interactions...

In order to reduce the effects of acoustic heterogeneity and therefore accurately reconstruct microwave absorption properties, a large number measured data are required estimate sound velocity distribution in microwave-induced thermoacoustic tomography (MITAT). However, process estimating heterogeneous tissue will consume lots computing time memory. This problem becomes serious especially for three-dimensional (3-D) imaging. To solve this problem, an improved iterative reconstruction method...

Microwave induced thermo-acoustic tomography (MITAT) is a developing technique for biomedical applications, especially early breast cancer detection. In this paper, impacts of short microwave pulse on (TA) signals are analyzed and verified through some experimental comparisons. these experiments, pulses with widths 10 ns 500 employed as radiation resources. TA generated from cubic sample in both time- frequency-domain. A trapezoid also performed comparing. Different previous literature, the...

Microwave induced thermo-acoustic tomography (MITAT) combines the advantages of both ultrasound imaging and microwave imaging. In this paper, a secure accurate MITAT system has been developed. Aiming to demonstrate capability in breast cancer detection, experiments by using real tissues tumor specimen have performed. The results show high contrast developed system. distinguishing ability for tumors at different clinical stages studied. experimental that can distinguish not only normal...

Microwave induced thermo-acoustic tomography (MITAT) has great potential in early breast cancer detection because it combines the advantages of microwave imaging and ultrasound imaging. Many developments MITAT including hardware image reconstructed methods have been achieved. In these achievements, accuracy efficient simulations are necessary. The can provide anticipation for progress evaluate performance developments. this paper, considering multiple physical characters MITAT, an integrated...

Time-of-∞ight (TOF) has been used to estimate sound velocity (SV) distribution of heterogeneous tissue relieve the efiect acoustic heterogeneity in microwave-induced thermo-acoustic tomography (MITAT). Accurately picking TOFs is signiflcantly important ensure high accuracy SV images, which greatly help reconstruct microwave absorption accurately. However, current methods for are designed single source case. For breast tumor detection MITAT, these become inefiective or even fail at situation...

Seismic waves in earth media usually undergo attenuation, causing energy losses and phase distortions. In the regime of high-frequency asymptotics, a complex-valued eikonal is an essential ingredient for describing wave propagation attenuating media, where real imaginary parts function capture dispersion effects amplitude attenuation seismic waves, respectively. Conventionally, such mainly computed either by tracing rays exactly complex space or approximately so that resulting distributed...

In this study, biogas and slurry were simultaneously treated using two symbiotic systems: Chlorella vulgaris - Ganoderma lucidum -S395-2 (endophytic bacteria) symbiont a Scenedesmus obliquus G. -S395-2. The influence of different mixed illumination intensity (red blue) ratios on the algal symbionts extracellular carbonic anhydrase activities discussed, as well rates microalgal growth photosynthesis. Simultaneously, treatment performance was assessed in terms efficiency organic matter or...

In this paper, a new method for accurately picking the time-of-flights (TOFs) of tumor is proposed in microwave induced thermo-acoustic tomography (MITAT) system. The makes use properties thermal acoustic signal and combines them with wavelet transform Akaike information criterion (AIC). Both numerical simulations ex vivo experimental results are given to test performance method. Through experiment, can efficiently pick TOFs target MITAT system therefore provide guarantee imaging high accuracy.

Microwave-induced thermoacoustic imaging (TAI) is a hybrid technique that combines electromagnetic radiation and ultrasonic waves to achieve high contrast submillimeter spatial resolution. These characteristics make TAI good candidate detect material anomalies change the electric properties without noticeable variation in density. Conventional pulsed systems work by sending single short pulse imaged target then detecting generated pressure signal; therefore, very peak power microwave or data...

Accurately reconstruct the tumor target in an acoustic heterogeneous tissue is a hot research issue thermo-acoustic tomography (TAT). In this paper, we present three imaging algorithms for microwave induced (MITAT): time reversal mirror (TRM), active adjoint modeling (AAM) method and iterative reconstruction (IRM). The performance of methods reconstructing breast are verified compared by using anatomically realistic numerical phantoms derived from T1-weighted MRIs prone patients. Through...