Proceedings IEEE International Symposium on Biomedical Imaging
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Các bài báo tiêu biểu
Improved image reconstruction from sensitivity-encoded data by wavelet denoising and Tikhonov regularization
- Trang 493-496
Parallel magnetic resonance imaging through sensitivity encoding using multiple
receiver coils has emerged as an effective tool to reduce imaging time. However,
errors in both the estimated coil sensitivity maps and the measured data, and
the ill-conditioned nature of the coefficient matrix (often associated with
non-localized coils) can degrade image quality significantly, limiting speed
enhancem...
#Image reconstruction #Noise reduction #Coils #Magnetic resonance imaging #Encoding #Velocity measurement #Degradation #Image quality #Equations #Signal to noise ratio
Depth-of-interaction effects in columnar phosphors for exponential X-ray absorption
- Trang 557-560
The depth-dependent blur of phosphor screens have been studied using analytical
and numerical methods by a number of investigators. We present an analysis of
the effect of depth-of-interaction on the modulation transfer function of
columnar phosphor screens. We extend our previously reported results of single
X-ray interactions to the study of X-ray beams that exponentially deposit energy
in the p...
#Phosphors #Electromagnetic wave absorption #X-ray imaging #Optical sensors #Sensor arrays #Optical refraction #Optical scattering #Optoelectronic and photonic sensors #Optical detectors #X-ray detection
Incorporation of diffusion tensor anisotropy in brain deformation models for updating preoperative images to improve image-guidance
- Trang 509-512
Image-guided neurosurgery requires a method for compensating for the loss in
registration accuracy as the surgery progresses due to tissue deformation
subsequent to craniotomy at the start of a case. Modeling methods may be able to
update the preoperative scans by estimating the tissue movement as surgery
progresses. For these techniques to be useful, knowledge of the intrinsic
mechanical and hydr...
#Tensile stress #Anisotropic magnetoresistance #Brain modeling #Deformable models #Diffusion tensor imaging #Surgery #Neurosurgery #Mechanical factors #Computational modeling #Data mining
Segmentation of the amygdalo-hippocampal complex by competitive region growing [MRI analysis]
- Trang 261-264
Semi-automatic segmentation of amygdala and hippocampus is of major interest to
neurologists but it is a challenge to numerical image analysis techniques
because of intrinsic complexity of those structures. We introduce a new method
to approach this problem with Markovian region growing. As we are concerned by
segmenting atrophic structures, we did not use shape priors, but constrained the
growth ...
#Hippocampus #Image segmentation #Shape #Atrophy #Pathology #Magnetic resonance imaging #Image edge detection #Morphology #Deformable models #Pattern matching
An integrated confocal and magnetic resonance microscope for observing living cells
- Trang 801-804
We have combined a confocal fluorescence optical microscope and a magnetic
resonance microscope into one instrument to image simultaneously a living cell
system. The high spatial resolution confocal and high spectral resolution
magnetic resonance microscope produces a set of closely linked, complementary
images. To enhance the value of this image set, we have also developed a
statistical method, l...
#Magnetic resonance #Magnetic force microscopy #Optical microscopy #Spatial resolution #Instruments #Image resolution #Predictive models #Fluorescence #Statistical analysis #Calibration
Infrared tissue imaging at on-the-spot laser delivery using an all-optical-waveguide transmitting system
- Trang 281-284
We present experimental results on mid-infrared thermal imaging of micro-scale
tissue area irradiated by an all-optical-waveguide laser delivery system. The
infrared transmitting system is based on a novel and simple laser delivery
technique that includes two key optical elements: a grazing-incidence-based
uncoated hollow taper used for direct infrared laser-to-fiber coupling, and a
tissue-activat...
#Infrared imaging #Optical imaging #Free electron lasers #Fiber lasers #Laser modes #Biomedical optical imaging #Optical coupling #Optical sensors #Optical fibers #Laser theory
Intra-operative 3D ultrasound augmentation
- Trang 421-424
We introduce an automated and accurate system for registering pre-operative 3D
MR and CT images with intraoperative 3D ultrasound images based on the vessels
visible in both. The clinical goal is to guide the radio-frequency ablation
(RFA) of liver lesions using percutaneous ultrasound even when the lesions are
not directly visible using ultrasound. The lesions locations and desired RFA
sites are ...
#Ultrasonic imaging #Lesions #Computed tomography #Needles #Liver #Computer displays #Radio frequency #Libraries #Biomedical imaging #Three dimensional displays
Tái tạo chùm tia cho Micro-CT Dịch bởi AI
- Trang 384-387
Micro-CT X-quang đã trở thành điểm nhấn trong phòng thí nghiệm CT/Micro-CT tại
Đại học Iowa. Trong bài báo này, chúng tôi mô tả một số tiến bộ gần đây mà chúng
tôi đã đạt được trong lĩnh vực micro-CT chùm tia hình nón. Đầu tiên, chúng tôi
đề cập đến việc tái tạo xấp xỉ sử dụng các thuật toán loại Feldkamp với nhiều
nguồn X-quang và cấu hình cảm biến bị lệch. Sau đó, chúng tôi giải thích ba loại
ar...
#Image reconstruction #X-ray imaging #Lungs #Mice #Optical imaging #X-ray detection #X-ray detectors #Image resolution #Sensor arrays #Data acquisition
Supertemporal resolution of functional MRI timecourse data
- Trang 911-914
High temporal resolution is critical in understanding the faster evolving
processes in the blood oxygenation level dependent (BOLD) response used in
functional magnetic resonance imaging. However, sampling rates faster than the
T1 relaxation rate may introduce distortions of the measured BOLD signal due to
spin saturation and blood inflow effects. We have developed a technique called
the supertemp...
#Magnetic resonance imaging #Signal resolution #Distortion measurement #Image resolution #Blood #Signal sampling #Rate distortion theory #Timing #High-resolution imaging #Sampling methods
Searching similar images for classification of pulmonary nodules in three-dimensional CT images
- Trang 189-192
This paper aims at obtaining diagnosis and prognosis information by searching
similar images into a three-dimensional (3-D) CT image database of pulmonary
nodules for which diagnosis is known. For this purpose, we propose an automatic
method to retrieve nodule candidates with similar characteristics from the
database. Each pulmonary nodule image is represented by the distribution pattern
of CT den...
#Computed tomography #Image databases #Cancer #Lungs #Spatial databases #Information retrieval #Clinical diagnosis #Image segmentation #Biomedical optical imaging #Optical sensors