BACKGROUND AND PURPOSE Flat panel detector CT images are degraded by streak artifacts caused by radiodense implanted materials such as coils or clips. A new metal artifacts reduction prototype algorithm has been used to minimize these artifacts. The application of this new metal artifacts reduction algorithm was evaluated for flat panel detector CT imaging performed in a routine clinical settin...

While recent advances in radiologic imaging have focused on CT and MRI technology, progress in digital radiographic techniques has also had significant impact on our ability to evaluate cardiothoracic disease. A number of publications have established the improved image quality of digital imaging systems over conventional film techniques [1]. While image quality has clearly improved with digita...

Today, most computed tomography (CT) systems acquire projection data from several hundred to thousands of directions by employing multi-row (2-D) or flat-panel detectors (cone-beam for 3-D imaging). It is important to notice the following fact: modern CT systems all rely on a rotational movement. The most widely utilized reconstruction algorithms, as for instance the well-known Feldkamp method,...

On X-ray diagnostic technology, it is important to grasp a change of the X-ray high-voltage equipment and radiographic technique factors. The 1st questionnaire was performed in 1974, and it carried out after that every five years, and conducted 8th investigation. As a result, we requested 656 institutions and got a reply from 103 institutions. The response rate was 15.7%. For X-ray high-voltage...

X-ray phase and dark-field imaging techniques provide complementary and inaccessible information compared to conventional X-ray absorption or visible light imaging. However, such methods typically require sophisticated experimental apparatus or X-ray beams with specific properties. Recently, an X-ray speckle-based technique has shown great potential for X-ray phase and dark-field imaging using ...

Active matrix, flat-panel x-ray imagers based on a-Si:H thin-film transistors offer many advantages and are widely utilized in medical imaging applications. Unfortunately, the detective quantum efficiency (DQE) of conventional flat-panel imagers incorporating scintillators or a-Se photoconductors is significantly limited by their relatively modest signal-to-noise ratio, particularly in applicat...

The advent of the use of digital area detectors in Volumetric Computed Tomography (VCT) systems has brought with it the challenges of achieving image quality comparable to that provided by earlier planar industrial CT systems equipped with highly collimated and efficient linear detector arrays. Particularly for imaging with higher voltage x-ray sources up to 450kVp, among the most distinct imag...

PURPOSE The authors describe a new technique to determine the system presampled modulation transfer function (MTF) in digital radiography using only the detector noise response. METHODS A cascaded-linear systems analysis was used to develop an exact relationship between the two-dimensional noise power spectrum (NPS) and the presampled MTF for a generalized detector system. This relationship w...

ID: 14240 Title: Efficacy of a linear lag correction algorithm in an a-Si flat-panel x-ray detector Purpose: Lag in a-Si flat-panel detectors (FPD) causes significant artifact. To date, most correction models have assumed a linear, time-invariant model (LTIM). We investigated detector response as a function of incident exposure. Method and Materials: The physics theory for charge trapping in FP...