Journal of X-Ray Science and Technology - Volume 11, issue 2

Authors: Ulyanov, Sergey

Article Type: Research Article

Abstract: Different methods of speckle-metrology, which may be used in biomedical diagnostics, are considered in this paper. Cross-correlation technique, digital speckle-photography, speckle-interferometry and phase-shifting interferometry are compared. Advantages and disadvantages of these methods are demonstrated; the limits for minimal resolution are studied.

Citation: Journal of X-Ray Science and Technology, vol. 11, no. 2, pp. 45-59, 2003

Authors: Li, Xiang | Jiang, Ming | Wang, Ge

Article Type: Research Article

Abstract: With the development of computing technology, there is an increasing interest in iterative CT image reconstruction. To study iterative reconstruction algorithms, we have developed a software simulator IterCT in VC++ on PC and made it publicly available on the Internet. In the latest version of the simulator, we have implemented four representative iterative image reconstruction algorithms, which are expectation maximization (EM) method and its ordered-subset version (OSEM), the simultaneous algebraic reconstruction technique …(SART) and its ordered-subset version (OSSART). The filtered backprojection method is included as the benchmark. Show more

Keywords: Computed Tomography (CT), image reconstruction, iterative reconstruction, expectation maximization (EM), simultaneous algebraic reconstruction technique (SART), ordered-subset

Citation: Journal of X-Ray Science and Technology, vol. 11, no. 2, pp. 61-70, 2003

Authors: Fazzio, R. Shane

Article Type: Research Article

Abstract: This paper describes an X-ray imaging architecture, called electronic planar laminography, that utilizes a time delay and integration (TDI) detector to provide laminographic cross-sectional images without recourse to a mechanically moving scintillator. Advantages in system performance and reduced complexity may be achieved in comparison with current scanned-beam laminographic systems. The architecture additionally allows for both two-dimensional radiography and digital reconstruction techniques. Any practical system design must make a number of trade-offs, such …as between resolution and throughput. These trade-offs are elucidated through consideration of different design examples. Show more

Citation: Journal of X-Ray Science and Technology, vol. 11, no. 2, pp. 71-81, 2003

Authors: Frank, Matthias | Friedrich, Stephan | Höhne, Jens | Jochum, Josef

Article Type: Research Article

Abstract: Cryogenic detectors are very sensitive, energy-resolving, low-threshold photon and particle detectors, which have been developed over the last decades for a variety of applications in particle physics and astrophysics. More recently, cryogenic detectors have also been applied as high-resolution, photon-counting detectors for energy-dispersive x-ray spectroscopy (EDS) and x-ray fluorescence analysis (XRFA). Cryogenic detectors can provide an about 10 times better energy resolution for x-rays than achievable with "conventional" energy-dispersive detectors, such as …HPGe and Si(Li) detectors. In this review, we give a brief introduction to cryogenic detectors (Section 1) and describe the basic operating principles and achieved performance of two types of cryogenic detectors most applicable to EDS and XRFA, superconducting tunnel junctions (Section 2) and hot-electron microcalorimeters (Section 3). In section 4 we discuss various practical aspects of using these cryogenic detectors for fluorescence applications including their operation at ultra-low temperatures close to XRF specimens at room temperature and achievable solid angle and efficiency. In Section 5 we present results from selected recent EDS and XRF experiments performed with cryogenic detectors and discuss their applications in semiconductor microanalysis and in fluorescence-detected absorption spectroscopy. Show more

Citation: Journal of X-Ray Science and Technology, vol. 11, no. 2, pp. 83-112, 2003