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Solid Media Transmission (SMT) is a new technology for transmitting robot actuation. SMT is similar to pneumatic or hydraulic transmissions, but uses solid balls and spacers rather than fluids to transmit force and displacement. SMT has been developed recently as a promising solution for specialized robot applications, including the challenges of confined space and strong magnetic field in Magnetic...
In order to obtain high resolution image of vessel wall of carotid artery, an 8-channel carotid coil is fabricated for 3T magnetic resonance imaging in this study. The phantom experiments and in-vivo studies are implemented in order to validate the performance of the fabricated 8-channel carotid coil. The high resolution images are obtained with the fabricated 8-channel carotid coil in clinical examination...
T2 mapping provides a quantitative manner to access tissue structure, composition, water content and iron levels. Nevertheless, due to the relative long scanning time, its practical usage is limited. This paper addresses this problem using a novel iterative nonlinear filtering method to achieve sparse sampling reconstruction. Specifically two filters are involved. One is the soft thresholding operator...
In this paper, a new method that incorporates the spatial information to localize prostate cancer with magnetic resonance imaging (MRI) is proposed. Most automated methods for tumor localization require manual peripheral zone extraction from the prostate gland, and it is a tedious and time-consuming job with considerable inter-observer variability. In order to conquer this difficulty, we propose to...
Obtaining MRI parametric maps for addressing pathophysiology features rather than focusing on anatomical structures of tissues is becoming popular in quantitative study of human glioma. In Perfusion MRI, injected contrast agent may leak into the surrounding tissues of a glioma due to the breakdown of blood-brain barrier (BBB) in malignant (i.e., high grade) gliomas. As the consequence, the intensity...
In this paper, a new method that uses relative contrast is proposed for medical image segmentation problems. Generally, the absolute intensity values of different features are mapped into a comparable range with a normalization method, but the differences across patients are not considered. In order to utilize the patient-specific information from medical images, we use relative contrast between the...
The speed of MR acquisition can be increased by decreasing the number of sequential phase encodes by means of arrays of multiple receiver coils. However, coil data are frequently corrupted due to involuntary movement during the data acquisition, which in turn have a significant influence on reconstructed composite image. In this article, a new method called Weighted-Sum-of-Squares (WSOS) is proposed...
In this paper, considering the characteristics of low SNR on low-field MR systems, we presented an optimized and more effective curve fitting method for quantitative T2 mapping. Series of T2-weighted images were acquired using a multi-echo spin echo sequence on a Siemens 0.35T open MR system. Adaptive curve fitting algorithm was performed based on T2-to-noise-ratio (T2NR) optimization, which was achieved...
Prostate cancer is the second leading cause of cancer death in American men. Current prostate MRI can benefit from automated tumor localization to help guide biopsy, radiotherapy and surgical planning. An important step of automated prostate cancer localization is the segmentation of the prostate. In this paper, we propose a fully automatic method for the segmentation of the prostate. We firstly apply...
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