Non-uniformity correction is a critical task for achieving higher performances in modern infrared imaging systems. Lately, special interest has been given to a scene-based adaptive non-uniformity correction approach based on a neural network with a steepest descent learning rule. However, low motion and some scene artifacts such as edges usually cause the production of ghosting-like artifacts o...

PURPOSE The imaging characteristics of two popular kV cone-beam CT (CBCT) and two MVCT systems utilised in image-guided radiation therapy (IGRT) were evaluated. MATERIALS AND METHODS The study was performed on Varian Clinac iX, Elekta Synergy S, Siemens Oncor, and Tomotherapy. A CT phantom (Catphan-504, Phantom Laboratory, Salem, NY) was scanned for measurements of image quality including ima...

In the direction where the phased array coil used in parallel magnetic resonance imaging (MRI) is perpendicular to the arrangement, sensitivity falls significantly. Moreover, in a 3.0 tesla (3T) abdominal MRI, the quality of the image is reduced by changes in the relaxation time, reinforcement of the magnetic susceptibility effect, etc. In a 3T MRI, which has a high resonant frequency, the sign...

Digital image representation is perceptually uniform if a small perturbation of a component value – such as the digital code value used to represent red, green, blue, or luminance – produces a change in light output at a display that is approximately equally perceptible across the range of that value. Most digital image coding systems – including sRGB (used in desktop graphics), BT.709 (used in...

• Geometric Distortion • Spatial Resolution • Slice thickness and position • Interslice Gap • Estimate of Image Bandwidth • Low Contrast Detectability • Image Uniformity • Signal-to-Noise Ratio (SNR) • Physical and Electronic Slice Offset • Landmark This document contains phantom specifications and materials and a brief description of image analysis. For a more complete description of the ACR M...

A linear accelerator vendor and the AAPM TG-142 report propose that quality assurance testing for image-guided devices such megavoltage cone-beam CT (MV-CBCT) be conducted on a monthly basis. In clinical settings, however, unpredictable errors such as image artifacts can occur even when quality assurance results performed at this frequency are within tolerance limits. Here, we evaluated the ima...

The original definition of a topological space given by Hausdorff used neighborhood systems. Lattice-valued maps appear in this context when you identify a topology with a monoid in the Kleisli category of the filter monad on SET. H?hle’s notion of a lattice-valued topology [2] uses the same idea and it’s inspired in the classical lattice-valued topologies. Ltopological spaces are motivated by ...