Proceedings IEEE International Symposium on Biomedical Imaging
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3D tomographic reconstruction of binary images from cone beam projections: a fast level set approach
- Trang 677-680
This paper addresses 3D tomographic reconstruction of a binary image from a small number of cone-beam projections. Under the binary hypothesis, the object may be conveniently represented by its surfaces, and the reconstruction problem solved using active contour methods. To handle complex topologies, we formalize the problem in the framework of level sets using implicit descriptions of object boun......
#Tomography #Image reconstruction #Level set #Surface reconstruction #Topology #X-ray imaging #Statistical analysis #Integral equations #Active contours #Biological system modeling
Raped calculation of detectability in Bayesian SPECT
- Trang 78-81
To speed up the laborious process of optimizing and comparing SPECT imaging systems, computational methods using model observers can be used to predict human performance in the context of a lesion detection task. We address the case of SPECT images reconstructed by Bayesian MAP methods and the use of a channelized Hotelling observer (CHO) for a detection task. It is possible to write a closed-form......
#Bayesian methods #Optimization methods #Computational modeling #Context modeling #Predictive models #Humans #Lesions #Image reconstruction #Image quality #Attenuation
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
Fast, iterative, field-corrected image reconstruction for MRI
- Trang 489-492
Magnetic field inhomogeneities cause distortions in the reconstructed images for non-cartesian k-space MRI (using spirals, for example). Several noniterative methods are currently used to compensate for the off-resonance during the reconstruction, but these methods rely on the assumption of a smoothly varying field map. Recently, iterative methods have been proposed that do not rely on this assump......
#Image reconstruction #Magnetic resonance imaging #Iterative methods #Spirals #Reconstruction algorithms #Equations #Fast Fourier transforms #Phase estimation #Image segmentation #Iterative algorithms
Mô hình hình dạng thống kê cho việc cạo xương sọ tự động từ hình ảnh não Dịch bởi AI
- Trang 855-858
Bài báo trình bày một mô hình hình dạng thống kê cho việc cạo xương sọ tự động từ hình ảnh cộng hưởng từ (MR) của não. Một mô hình bề mặt biên giới của não được biểu diễn theo cách phân cấp bởi một tập hợp các mảnh bề mặt chồng lấn lên nhau, mỗi mảnh có tính chất đàn hồi và phạm vi biến dạng được học từ tập huấn luyện. Đặc điểm biến dạng của mô hình được thiết lập phân cấp, điều này tăng cường độ ......
#Shape #Brain modeling #Deformable models #Surface morphology #Elasticity #Skull #Robustness #Surface fitting #Statistics #Radiology
Sửa chữa các hiệu ứng LOR bên ngoài trong tái tạo danh sách cho PET Dịch bởi AI
- Trang 537-540
Trong hình ảnh PET, chế độ danh sách là một lựa chọn thay thế cho các phép chiếu để lưu trữ dữ liệu thu nhận một cách chính xác hơn. Tái tạo từ định dạng chế độ danh sách đòi hỏi những phương pháp khác với các thuật toán dựa trên phép chiếu. Thuật toán ML-EM đã được điều chỉnh để bắt đầu từ định dạng chế độ danh sách. Các tác động làm suy giảm hình ảnh dữ liệu chế độ danh sách có thể được phân loạ......
#Positron emission tomography #Detectors #Image reconstruction #Event detection #Attenuation #Scattering #Degradation #Iterative algorithms #Reconstruction algorithms #Cameras
Synchrotron radiation coronary microangiography in isolated perfused rat heart for evaluation of coronary vascular response
- Trang 561-564
Visualization of vasoconstriction and vasodilatation of coronary arteries with vasoactive agents is a useful research tool for evaluation of coronary vascular reserve. Microangiography with spatial resolution in the micrometer range was carried out to depict coronary vascular response in a rat heart under Langendorff perfusion using a high-speed imaging system and a third generation synchrotron ra......
#Synchrotron radiation #Heart #Optical imaging #X-ray imaging #Visualization #Arteries #High-resolution imaging #Spatial resolution #X-ray detection #X-ray detectors
3-D Bayesian ultrasound breast image segmentation using the EM/MPM algorithm
- Trang 86-89
In this paper, ultrasound breast image segmentation is improved by using the volumetric data available in neighboring slices. The new algorithm extends the EM/MPM framework to 3D by including pixels from neighboring frames in the Markov Random Field (MRF) clique. In addition, this paper describes a unique linear cost factor introduced in the optimization loop to compensate for the attenuation comm......
#Bayesian methods #Ultrasonic imaging #Breast #Image segmentation #Markov random fields #Magnetic resonance imaging #Acoustic noise #Image processing #Cost function #Attenuation
Molecular imaging of biological processes from microPET in mice to PET in patients
- Trang 1-9
This article focuses on bringing together mice to patients with microPET to PET and molecular imaging probes and drugs for molecular diagnostics and molecular therapeutics. In the latter there is a common disease target in which near massless amounts of a molecular imaging probe is used to image the presence and function of the target and then to use the same molecule, or analogs of it, in mass am......
#Molecular imaging #Biological processes #Mice #Positron emission tomography #Cardiac disease #Cardiovascular diseases #Probes #Systems biology #Cells (biology) #Drugs