Intense and monochromatic X-rays by channeling radiation

Genz, H.

doi:10.1016/0168-583x(94)95240-x

Cited by 7 publications

(2 citation statements)

References 17 publications

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“…[8][9][10][11][12] To transfer the radiological potential of monochromatic sources to a clinical diagnosis a development of new technologies for monochromatic x-ray production is desirable. Channeling radiation from electron crystal interaction, 13,14 free electron laser and Compton backscatter, 15 and laserproduced plasma x-ray source 16 have been proposed.…”

Section: Introductionmentioning

confidence: 99%

Spatial resolution measurements in quasimonochromatic x rays with mosaic crystals for mammography application

Gambaccini¹,

Tuffanelli²,

Taibi³

et al. 2001

Medical Physics

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A novel x-ray source for mammography application is being investigated. Quasimonochromatic x rays have been produced via Bragg diffraction with a W-anode x-ray tube and a graphite mosaic crystal array. The system provides 18 keV x rays with an energy resolution deltaE/E approximately equals 0.12. A thorough analysis of the spatial resolution of the system has been performed in order to understand and quantify the effect of the introduction of an active optical element such as a mosaic crystal in the x-ray path. The focal spot of the source and its emission properties have been studied by using the slit camera method. Experiments have shown that the introduction of a mosaic crystal in the optical path modifies the resolution properties of the Bragg diffraction-based radiography system. Along the direction perpendicular to the diffraction plane the resolution properties of the imaging system mainly depend on the x-ray tube focal spot size and position. Along the diffraction plane the focal spot size depends on mosaic characteristics and on the geometrical setup. Hence, it could be modified by setting the appropriate experimental conditions.

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Section: Introductionmentioning

confidence: 99%

Spatial resolution measurements in quasimonochromatic x rays with mosaic crystals for mammography application

Gambaccini¹,

Tuffanelli²,

Taibi³

et al. 2001

Medical Physics

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“…To transfer the radiological potential of monochromatic sources to a clinical diagnosis, a reduction in the size and cost of synchrotron facilities or the advent of new technologies for monochromatic x-ray production are needed. Channelling radiation from electron crystal interaction (Genz 1994, Knüpfer 1994), free electron laser and Compton backscatter (Carrol et al 1990), and a laser-produced plasma x-ray source have been proposed (Krol et al 1997).…”

Section: Introductionmentioning

confidence: 99%

A prototype of a quasi-monochromatic system for mammography applications

et al. 2005

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Improvement in image contrast and dose reduction, in mammographic x-ray imaging, can be achieved using narrow energy band x-ray beams in the 16-24 keV range. As part of an Italian Government funded project, a quasi-monochromatic system for mammography applications has been developed. The system is based on a tunable narrow energy band x-ray source operating in the 16-24 keV energy range. The bremsstrahlung beam is monochromatized via Bragg diffraction by a highly oriented pyrolytic graphite mosaic crystal (HOPG). The scanning system provides a large field (18 x 24 cm2) of quasi-monochromatic x-rays with energy resolution ranging from 10% at 18 keV to 17.2% at 24 keV. The system has been characterized in terms of fluence rate and energy resolution. An x-ray tube developed ad hoc allows us to acquire images in a reasonable time to minimize the motion blur. A qualitative analysis has been performed in order to know if the prototype system performances are far from a clinical application, by evaluating the spatial resolution, the field uniformity and the image quality as a function of the quasi-monochromatic beam energy. Dose evaluation has been performed as a function of the energy and compared to a conventional system for mammography. The quasi-monochromatic prototype system can produce comparable image quality at half the dose.

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