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PROPELLER (periodically rotated overlapping parallel lines with enhanced reconstruction) MRI, proposed by J. G. Pipe, offers a novel and effective means for compensating motion. For the reconstruction of PROPLLER data, algorithms to reliably and accurately extract inter-strip motion from data in central overlapped area are crucial to motion artifacts suppression. When implemented on T1-weighted MR...
This paper presents a method to segment brain tissue from T1-weighted magnetic resonance (MR) images. A modified BayesShrink method is utilized to filter the image in wavelet transform domain before segmentation, where the shrinkage strength is automatically adjusted with respect to noise level. Then the fuzzy c-means clustering is applied to segment brain tissue into cerebrospinal fluid, gray matter...
In this report, we propose to reconstruct thermal properties such as thermal conductivity and thermal diffusivity in addition to the mechanical properties for diagnosis and treatment (planning). Temperature distribution can be measured by ultrasonic imaging and MRI. Provided that the reference values of thermal properties are given in the ROI as initial conditions, by solving the simultaneous first...
The primary goal in this study was to investigate 3-D dose distribution, near the areas of tissue inhomogeneities, in Gamma Knife radiosurgery with the gel dosimetry. The spherical glass balloon of a diameter of 16 cm filled with the gel forms the homogeneous phantom; and an identical balloon with two corks placed on each side to represent the air cavities forms the inhomogeneous phantom. Dose calibration...
To register pre-operative MRI/CT images with intra-operative ultrasound images based on the vessels visible in both of the modalities, we presents a non-rigid registration method of multimodal medical images based on free form deformation was proposed. When the images are aligned, the centerline points of the vessels in one image will align with the intensity ridge points in the other image. Rigid...
MRI system noise often appears in the fMRI timeseries in phantom and human subjects experiments. The predominant characteristic of this MRI system noise is high amplitude at one or a few specific temporal frequencies. These frequencies are immediately found by FFT analysis, but they have also been identified in ICA methods. This study indicates that these frequencies should be considered in the design...
Accurate assessment of total body and the distribution of regional adipose tissue is a critical problem emerging in the United States. Using manual segmentation of MRI scanned images is a problem due to the high variation between manual delineations. Manual segmentation also requires highly trained experts with knowledge of anatomy. In this study, we used a specific water saturation sequence and histogram...
One way to reduce receiving coil noise in MRI scans is using non-resistive high-temperature superconducting (HTS) coils. They show advantages of much lower cost and easier fabrication over HTS thin film coils. In this work, we built a 200 mm in diameter Bi2Sr2Ca2Cu3Ox (Bi-2223) tape HTS RF coil and demonstrated that the SNR of using the HTS tape coil was 2.22 folds higher than that of the traditional...
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