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MR-guided pHIFU (phased High Intensity Focused Ultrasound) system can realize non-invasive ablation of tumors. In order to use MR as the guidance, there must be a precise transfer matrix between the MR and HIFU system. In this paper, some methods are proposed to improve the precision of positioning. One image-processing algorithm is used to automatically pick up the points. Furthermore, this paper...
MR-guided focused ultrasound surgery is a promising noninvasive thermotherapy. To achieve a rapider and more accurate treatment requires continuous attention. In this paper, a more precise method for focal positioning is proposed. The ultrasound transducer with phased array can shift the focal position within the target area. Several points with appropriate distance are selected to establish the mapping...
Accurate temperature measurement plays a pivotal role in Magnetic Resonance-guided focused Ultrasound Surgery (MRgFUS) treatment. However, the magnetic resonance parameters affect the result. The purpose of this work is to investigate the effects of thickness parameter and the relationship between temperature and thickness. An experiment system is setup with a home-build HIFU device, a tissue-mimicking...
During the treatment of soft tissue tumors using focused ultrasound surgery (FUS), the focus can shift away from the desired point due to tissue inhomogeneity. In this paper, a numerical method to calculate the focus shift in multiple-layered tissues and a faster phase-correction method to restore the focus were developed. Data from the simulations showed that the focus shifted about 2 mm along the...
An approximate analytical solution for tissue temperature distribution in high-intensity focused ultrasound (HIFU) is obtained in this work. Based on variable separation method (VSM), the solution is performed to solve the simplified bioheat transfer equation (BHTE). Lack of enough boundary conditions; the parameters in this analytic solution are estimated using the temperature data calculated by...
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