This paper describes a system for sub-pixel registration of mask and opacified digital X-ray images so that the mask image can be accurately subtracted out from the opacified image. Our technique results in digital subtraction angiograms (DSAs) with fewer artifacts and better contrast.

The National Library of Medicine (NLM) is developing a digital chest x-ray (CXR) screening system for deployment in resource constrained communities. An important first step in the analysis of digital CXRs is the automatic detection of the lung regions. In this paper, we present a graph cut based robust lung segmentation method that detects the lungs with high accuracy. The method consists of t...

Conventional radiology is performed by means of digital detectors, with various types of technology and different performance in terms of efficiency and image quality. Following the arrival of a new digital detector in a radiology department, all the staff involved should adapt the procedure parameters to the properties of the detector, in order to achieve an optimal result in terms of correct ...

• 2.2μm pixel with AptinaTM A-PixTM technology • Full HD support at 60 fps (2304H x 1296V) for maximum video performance • Superior low-light performance • 3.4Mp (3:2) and 3.15Mp (4:3)still images • Support for external mechanical shutter • Support for external LED or Xenon flash • Data interfaces: four-lane serial high-speed pixel interface (HiSPiTM) differential signaling (SLVS), four-lane se...

Spot density is commonly used as an indication of shower energy in emulsion chambers. In a system originally developed for JACEE analysis, the optical density of a spot on x-ray film is estimated from macroscopic digital images. The spot’s size is used to compensate for the lack of dynamic range obtainable with digital imaging hardware. These densities are compared to manually measured densities.

The continuing progress in the resolution and quality of solid state matrix sensors has made the use of digital cameras onboard an aircraft an interesting option. Although by far not yet comparable to the resolution of scanned 9” x 9” film, direct digital data capture is meanwhile a viable alternative for a number of applications. Direct digital data capture avoids time consuming development an...

Study of Image quality parameters like Contrast, SNR and MTF for Digital Radiography with FPD were carried out at different X-Ray tube variables like energy of X-Ray (kV) and tube current (mA) for different welded tube thicknesses. Experiments of Digital Radiography were carried out on butt welded tubes. Images of these welded tubes were taken with different kV and mA on actual working setup ke...

Digital predistortion of nonlinear systems is an important topic in many practical applications. This paper considers direct predistortion of a Volterra system by connecting in tandem an adaptive Volterra predistorter. The coefficients of the predistorter can be recursively estimated using the nonlinear filtered-x least mean squares (NFxLMS) algorithm. In this paper, the prediction error method...

X‐rays were discovered in 1895 by Wilhelm Roentgen. Digital radiology has overtaken conventional screen‐film radiography since it was introduced in the mid‐1980s.[1] Digital imaging uses sensor of solid‐state, and information is presented and stored as an image using a computer. The dawn of the digital era in dental radiography came in 1987 with the first digital radiography system called radio...