Greedy Algorithms
Greedy algorithms estimate the support and coefficients of the signal in an iterative approach. At each iteration the estimate of the signal is improved by updating its support. Two well know Greedy algorithms are Matching Persuit (MP) based methods and Iterative...Central Slice Theorem
To reduce the computational load of back projection (which is of O(N3) for an N N image), Fourier based reconstruction methods have been proposed . The Central Slice Theorem (CST) or Direct Fourier Reconstruction (DFR) relates the 1D Fourier transform of the...Feature Extraction in Image Processing
Edges are low-level image features, which are basic features that can be extracted automatically from an image with information about spatial relationships that are most obvious to human vision. Curvature Curvature is another low level feature that is the rate of...C++ Boost implementation
In order to generate uniform distributed sample on the fly, the C++ Boost library was applied with its powerful statistical distribution templates. For generating a uni form distributed sample, the Mersenne Twister generator was implemented used. The Mersenne Twister...Tweet Information
The number of tweets collected for participating users varies widely, as shown in Figure. As discussed in subsection only about the most recent 3200 tweets can be collected from a user.The average of 1538 tweets collected per user and median of 1065 suggest that for...Tweet Loading
As part of the web form submission and in order to download users’ tweets, the users must be followed on Twitter. Following users as they participate via the web form and downloading their tweets is accomplished by using three programs developed as part of this work....Using Word and Phrase Abbreviation Patterns to Extract Age From Twitter Microtexts
Twitter is a relatively new service, made public in 2006, which allows users to post 140 character updates. They can follow other users, such as friends, celebrities, or companies to receive a live digest of those users’ updates. Users can engage in public or private...Clinical Dose Reduction Strategies
Clinical Dose Reduction Strategies Some clinically used strategies for dose optimization will be briefly discussed in this subsection. It is notable that for dose optimization, the exam must be performed using doses that are As Low As Reasonably Achievable (ALARA),...X-ray Dose measurement
X-ray Dose measurement In this section we briefly review different definitions, units, and measurement methods of X-ray dose in CT imaging. Dose is a general term used to quantify how much radiation exposure aperson (or other material) has received. Radiation dose...Iterative Reconstruction
Iterative Reconstruction The quality of the images reconstructed by standard FBP algorithms depend on several assumptions about scanner geometry and raw data, such as continuity of the projections and noiseless measurements, which are typically violated. The...Capillary phantom construction
Capillary phantom construction To test whether separate strands of fibers within a large parallel bundle can be distinguished from each other, a capillary fiber phantom was created using flexible fusedsilica capillary tubing manufactured by Polymicro Inc. (Molex,...The Mercury/Tornado RF signal receiver
The Mercury/Tornado RF signal receiver The received signal from a diffusion experiment has a wide dynamic range, with the diffusion weighted image having approximately 33% the signal of the un-weighted image when choosing a b-value that maximizes the DNR (S=exp(-b*D)...Oil/Water Phantom
Oil/Water Phantom To demonstrate the fat suppression capabilities of the eZOOM sequence a water/oil phantom was used. A 50ml container (HDPE plastic) was filled with approximately 65% tap water and 30% canola oil (leaving about 5% air space) and placed upright into...Diffusion Weighted Imaging
Diffusion Weighted Imaging The free diffusion of water due to Brownian motion forms the basis for the development of diffusion MRI. In 1965 Stejskal and Tanner published a landmark paper describing an MR spin-echo pulse sequence that allowed the detection of the...Review of Literature about Recording Channels
Monitoring the interplay of neuronal ensembles in the brain is important for understanding mechanisms underlying memory, learning and behavior. Recently a group of neuroscientists have proposed launching a large-scale, international public effort called “Brain...
Troubleshooting and online tutorials
