Optimum ultrasound exposure condition for excitation of nonlinear behavior of microbubbles coated with surfactant.
نویسندگان
چکیده
منابع مشابه
Subharmonic behavior of phospholipid-coated ultrasound contrast agent microbubbles.
Coated microbubbles, unlike tissue are able to scatter sound subharmonically. Therefore, the subharmonic behavior of coated microbubbles can be used to enhance the contrast in ultrasound contrast imaging. Theoretically, a threshold amplitude of the driving pressure can be calculated above which subharmonic oscillations of microbubbles are initiated. Interestingly, earlier experimental studies o...
متن کاملNonlinear response to ultrasound of encapsulated microbubbles.
The acoustic backscatter of encapsulated gas-filled microbubbles immersed in a weak compressible liquid and irradiated by ultrasound fields of moderate to high pressure amplitudes is investigated theoretically. The problem is formulated by considering, for the viscoelastic shell of finite thickness, an isotropic hyperelastic neo-Hookean model for the elastic contribution in addition to a Newton...
متن کاملUltrasound-responsive polymer-coated microbubbles that bind and protect DNA.
Ultrasound in combination with microbubbles has recently been considered by gene delivery scientists to be an interesting approach to enhance gene transfer into cells. Its low toxicity and simplicity to apply in vivo without major complications make this technology (sonoporation) especially attractive. Sonoporation of DNA has been evaluated in vivo by the injection of free plasmid DNA (pDNA) to...
متن کاملUltrasound with microbubbles
Conventional ultrasound has well known short comings in the detection and characterisation of focal liver lesions. A false negative rate of up to 30% has been quoted in the detection of liver metastases and its accuracy in the characterisation of focal liver lesions is poor compared to computed tomography (CT) and magnetic resonance (MR). Ultrasound microbubble contrast agents have redressed th...
متن کاملOPTIMUM WEIGHTED MODE COMBINATION FOR NONLINEAR STATIC ANALYSIS OF STRUCTURES
In recent years some multi-mode pushover procedures taking into account higher mode effects, have been proposed. The responses of considered modes are combined by the quadratic combination rules, while using the elastic modal combination rules in the inelastic phases is not valid. Here, an optimum weighted mode combination method for nonlinear static analysis is presented. Genetic algorithm is ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Acoustical Science and Technology
سال: 2001
ISSN: 1346-3969,1347-5177
DOI: 10.1250/ast.22.364