introduction: the medical applications of ultrasound on human brain are highly limited by the phase and amplitude aberrations induced by the heterogeneities of the skull. however, it has been shown that time reversing coupled with amplitude compensation can overcome these aberrations. in this work, a model for 2d simulation of the time reversal mirror technique is proposed to study the possibil...

Applications of ultrasound in medicine for therapeutic purposes have been accepted and beneficial uses of ultrasonic biological effects for many years. Low-power ultrasound of about 1 MHz has been widely applied since the 1950s for physical therapy in conditions such as tendinitis and bursitis. In the 1980s, high-pressure-amplitude shock waves came into use for mechanically resolving kidney sto...

background: breast cancer is the most common cancer in women. screening can reduce the rate of cancer and mortality. the aim of this study is description of screening programs about breast masses with clinical and para clinical examination. methods: this is a descriptive study on 952 women who had volunteered or were referred to tabriz behbood hospital during one-year period. data was collected...

currently available non-invasive clinical methods for diagnosing osteoporosis are mainly associated with ionizing radiation. ultrasonic assessment of bone disease is a more recent technology. a theoretical explanation for the relationship between ultrasonic parameters and bone structure is necessary. thus, two types of bone samples of perspex (hap) and perspex-glass beads were produced. each ty...

Fluorescence photoacoustic tomography (fPAT) is a multi-modality biomedical imaging technique that combines the high-resolution ultrasound imaging with the highcontrast fluorescence optical tomography. In the first step of fPAT, one utilizes the photoacoustic effect to recover the total absorbed energy map inside the media with ultrasound tomography. In the second step, called quantitative fPAT...

Intravascular Ultrasound Image (IVUS) is one of the medical imaging techniques based on the catheter. These techniques are very useful for studying heart diagnose and management of arterial atherosclerosis. It produces the vessel cross sectional images of blood vessels that provide the quantitative and qualitative assessment of the vascular wall information about the nature of atherosclerosis l...

Ultrasound has been widely employed in food industry, while some of its working parameters are usually neglected to be described in its application, which caused the difficulty of reproducing and comparing the results obtained by different groups. So it is definitely not sufficient to simply state the ultrasound conditions such as ultrasound power, frequency and t...

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This paper deals with improving the time-frequency resolution of Doppler ultrasound spectroscopy, applied to blood flow analysis, by developing robust nonstationary spectrum estimation techniques based on Gabor filterbanks and multiband AM-FM demodulation that uses an instantaneous energy separation algorithm.