Proceedings IEEE International Symposium on Biomedical Imaging
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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
Statistically-based reorientation of diffusion tensor field
- Trang 757-760
Presents a new method for warping of diffusion tensor fields. The proper reorientation of a tensor field requires knowledge of the underlying fiber orientation, which is not known a priori. Accordingly, a probabilistic representation of the fiber direction is adopted and used in a Procrustean estimation of the rotational component of the warping field. The estimated rotational component, along wit......
#Tensile stress #Anisotropic magnetoresistance #Diffusion tensor imaging #Signal to noise ratio #Eigenvalues and eigenfunctions #Radiology #Biomedical imaging #Resonance #Microscopy #Fuses
Synchrotron radiation /spl mu/CT of biological tissue
- Trang 365-368
Synchrotron Radiation (SR) /spl mu/CT allows improving the performance of standard ACT in terms of spatial and density resolution, signal to noise ratio, and acquisition time. SR ACT is available or in development in most synchrotron facilities. After a brief description of the ID19 ESRF SR /spl mu/CT set up, the differences between images acquired using SR ACT and ACT are highlighted. The potenti......
#Synchrotron radiation #Biological tissues #Biomedical imaging #Strontium #Spatial resolution #High-resolution imaging #X-ray imaging #Optical imaging #Image reconstruction #Computed tomography
Impact of axial collimation on hybrid PET image quality
- Trang 549-552
Previous studies have suggested that novel axial collimator designs may be able to increase coincidence efficiency, and better shield out-of-FOV singles photons. It was found that increasing the air gap between the septa and using converging septa increased the sensitivity to the central FOV and improved the shielding from out-of-FOV events. We are currently investigating image quality of such col......
#Collimators #Positron emission tomography #Image quality #Cameras #Gamma ray detection #Gamma ray detectors #Face detection #Image converters #Image reconstruction #Event detection
Micro-SPECT Dịch bởi AI
- Trang 373-376
Sử dụng một loạt các chế phẩm phóng xạ có sẵn và điều tra, cùng với thiết bị tương đối rẻ tiền, chụp cắt lớp phát xạ đơn photon (SPECT) cung cấp một công cụ hữu ích để thu thập thông tin chức năng giá trị trong cơ thể sống (in vivo). Bị giới hạn bởi việc sử dụng hệ thống chấn lưu bằng chì, SPECT lâm sàng có hiệu suất phát hiện thấp hơn nhiều và độ phân giải không gian kém hơn, dẫn đến chất lượng h......
#Spatial resolution #Collimators #Positron emission tomography #Instruments #Computed tomography #In vivo #Image quality #Animal structures #Isotopes #Apertures
Prior shape models for boundary finding
- Trang 30-33
Prior shape information has proven to be a key component of modeling for boundary finding when the target objects belong to a class of similar shapes. Prior shape provides specific constraining information needed in order to overcome noise, missing boundaries and confusing image information. While a number of different methods have been proposed for incorporating prior information, the most natura......
#Probability #Bayesian methods #Optimization methods #Biomedical imaging #Shape measurement #Active shape model #Radiology #Noise shaping #Medical diagnostic imaging #Search methods
On the effectiveness of doubly adaptive estimation for dynamic MRI sequence acquisitions
- Trang 959-962
We present experimentally-acquired MR image sequence reconstruction results and a review of the recently proposed doubly adaptive temporal update method (DATUM) for the acquisition of dynamic MRI sequences. The DATUM algorithm is novel in providing an estimation and tracking framework for both image reconstruction and the image acquisition inputs. We discuss the difficulty in choosing viable syste......
#Adaptive estimation #Magnetic resonance imaging #Image reconstruction #Data acquisition #Spatial resolution #Hospitals #Biomedical imaging #Radiology #Image sequences #Production systems
Far-field electrophysiology reflects top-down control
- Trang 395-398
For forty years, much human electrophysiologic thinking has been based on the concept that EEG data recorded from the scalp following sensory stimulation are dominated by successive far-field correlates of bottom-up brain sensory processing, as represented in evoked potential (EP) averages. I will present evidence for an alternate view that human EEG data are dominated by oscillatory processes rel......
#Humans #Electroencephalography #Brain modeling #Independent component analysis #Scalp #Frequency synchronization #Signal processing #Monitoring #Electrophysiology #Event detection
Imaging gene expression and signal transduction pathway activity
- Trang 820-823
Molecular imaging is a new field of study that develops the technology to image disease on a cellular or genetic level rather than on a gross anatomical level. The ability to non-invasively monitor different cellular molecular-genetic processes in vivo is the goal of molecular imaging. The pace of progress in this field is encouraging, particularly in the imaging of gene expression. Recent advance......
#Gene expression #Diseases #Molecular imaging #Monitoring #Medical treatment #In vivo #Cells (biology) #Sequences #Genetic mutations #Cancer
An engineering approach to image-based phenotyping
- Trang 381-383
The explosive growth of rodent models for basic biomedical research has created a compelling need for new methods of phenotyping. Modern imaging technologies offer a number of solutions. But, simply scaling clinical systems to use on small animal models is inappropriate. We present here a method to develop imaging tools for both structural and functional phenotyping using an interdisciplinary appr......
#Biomedical imaging #Biomedical engineering #Explosives #Rodents #Animals #In vivo #Microscopy #Lungs #Helium #Mice