Directional enhancement of characteristic relative to bremsstrahlung X-rays: Foil thickness optimization

Low-Bremsstrahlung X-Ray Source Using a Low-Voltage High-Current-Density Nanostructured Field Emission Cathode and a Transmission Anode for Markerless Soft Tissue Imaging

“…Monochromaticity of the X-ray has proven to be an important factor for high image quality [18], [38]- [43]. Conventional X-ray imaging systems use the broadband bremsstrahlung radiation to expose the object, resulting in blurry images.…”

“…However, generation of purely monochromatic X-ray requires either high-energy electron sources [38], [40] or expensive precision optics [39]. X-ray filtering techniques can also be used to remove some of the unwanted frequency contents from the X-ray spectrum [41]- [43]; however, these techniques require certain peripheral structures that complicate the overall system. A simple approach for achieving monochromatic X-ray is reported in [18] where the anode voltage is set to a certain value such that the relative magnitude of the L-shell transition is maximized; a quasi-monochromatic X-ray at 2.45 kV energy is generated from a reflection molybdenum anode.…”

The physical and biomedical characteristics of the novel transmission type X-ray equipment

“…The transmission-target X-ray tube increases the X-ray production rate and reduces the heat energy [Harding et al, 2007]. The cathode of the transmission-target X-ray tube releases electrons which hit the thin target, and X-ray comes out directly from the end-window in front of the metal target (Fig.…”

Behavior of characteristic X-rays from a partial-transmission-type X-ray target

“…Because quasimonochromatic X-rays provide better image quality and minimize the patient dose, they are used in coronary angiography, phasecontrast radiography, and mammography (McKinley et al, 2005). X-ray fluorescence (XRF) and X-ray diffraction (XRD) techniques depend strongly on the quality of quasi-monochromatic X-rays for precise analysis (Harding et al, 2007). Quasi-monochromatic X-rays can be produced using various methods, such as synchrotron radiation (Freudenberger et al, 2001), Bragg diffraction methods (McKinley et al, 2005), and monochromatization of a polychromatic X-rays using an X-ray filter (McKinley et al, 2005).…”

“…A synchrotron produces quasi-monochromatic X-rays, but the size and cost limit its applications in the biomedical field (Baldelli et al, 2005). The production of nearly monochromatic X-rays from X-ray tubes using a filter is also a well-established method (Harding et al, 2007). However, the main drawback of this method is the remarkable attenuation of the X-rays.…”