X-ray imaging sensor using CdTe crystals for dual energy X-ray absorptiometry

Medical imaging applications using X-and gamma-rays have reached outstanding levels of complexity and performance, thanks to technology achievements in the fields of radiography, tomography and high resolution synchrotron devices. The operability of the related instrumentation resides in the availability of highly qualified specialists, as well as of medical doctors for diagnoses and treatment. This is a problem for personnel working in difficult ambient conditions as can be found in remote sites like Arctica, Antarctica and under-populated, desolated or mountainous regions on Earth. Astronauts, during long permanence at the Space Station or on future mission to Mars are potentially subject to risks such as traumas, fractures or diseases which would require semi-automated, easyto-handle application of X-ray radiographic devices. For this purpose, the possible use of imaging instrumentation based on solid state detectors is discussed with special regard to CdZnTe pixel devices, now available with sub-mm resolution. The use of these semiconductor detectors will also allow to perform image diagnostics at much lower doses compared to the current plate-based radiographic techniques.

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“…This possibility has been exploited e.g. for bone densitometry application which requires a dual energy scanning device [9].…”

Section: Applications To Digital Diagnostics Including Space Radiologymentioning

confidence: 99%

High Performance, Low-Dose Radiography Systems for Space and Remote Site Applications

Natalucci

Ubertini

Bazzano

et al. 2009

Wireless Pers Commun

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“…For application of the DXCT method, other groups measured the linear attenuation coefficients corresponding to two different energy spectra that were obtained by combining a white X-ray radiation with two different filters or using the dual tube voltage technique. 4,7,8) In order to determine the physical properties of the scanned materials from the measured attenuation coefficients, Millner et al thought that there might have an effective energy for each spectrum and the attenuation coefficient at each spectrum was equal to that at the effective energy. 9) However, since the effective energy for a certain spectrum is generally different for materials with quite different atomic numbers or densities, 10) this method is also not suitable for the case of scanned materials with a broad dynamic range of atomic number or density.…”

Section: Introductionmentioning

confidence: 99%

Atomic Number and Electron Density Measurement Using a Conventional X-ray Tube and a CdTe Detector

Zou

Nakashima

Onishi

et al. 2008

jjap

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In order to apply the dual-energy technique to material identification, a new computed tomography scanning system was proposed using a conventional X-ray tube and a CdTe detector. This system can provide information of projection data at two distinct energy bands for scanned materials. After introducing an approximation, the measured projection data were reconstructed to obtain the distributions of the X-ray linear attenuation coefficients of the materials at two different energies. Then, the corresponding atomic number and electron density can be derived with the dual-energy X-ray computed tomography (DXCT) method adopted. By comparing the obtained results with theoretical ones, the feasibility of using this system for identifying low-Z materials was demonstrated in this study.

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“…One practical example of the digital energy subtraction method is employed for the measurement of bone mineral density. 6,7) In this method, white X-rays are transformed by filters into two quasi-monochromatic X-rays. Using semiconductor detectors with two single channel analyzers, the number of X-rays with higher and lower energies, which were transmitted through a subject, could be measured.…”

Section: Introductionmentioning

confidence: 99%

Low Exposure X-ray Transmission Measurements for Contrast Media Detection with Filtered X-rays

Kanno

Maetaki

Aoki³

et al. 2003

J. Nucl. Sci. Technol.

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A feasibility study of X-ray transmission measurements for contrast media with less exposure using filtered Xrays and their energy information is described. Based on measurements of the energy spectra of La-filtered X-rays, sensitivity to the contrast media and the relative quantity of dose exposure of filtered X-rays as the ratio to white Xrays are shown. The dose exposure for the measurement of iodine contrast media is reduced by more than 50% with a 400 µm thick La filter. By using a filter with atomic number close to that of iodine such as Cs and Ba, a greater reduction in dose exposure with a smaller increase in the current of the X-ray tube is expected.

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X-ray imaging sensor using CdTe crystals for dual energy X-ray absorptiometry

Cited by 11 publications

References 17 publications

High Performance, Low-Dose Radiography Systems for Space and Remote Site Applications

High Performance, Low-Dose Radiography Systems for Space and Remote Site Applications

Atomic Number and Electron Density Measurement Using a Conventional X-ray Tube and a CdTe Detector

Low Exposure X-ray Transmission Measurements for Contrast Media Detection with Filtered X-rays

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