Characteristics of low-angle x-ray scattering from some biological samples

Elshemey, Wael M.; Elsayed, Ashraf; El-Lakkani, Ali

doi:10.1088/0031-9155/44/12/304

Cited by 20 publications

(15 citation statements)

References 29 publications

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“…where we have used the transition amplitude (6). Here the integration over the impact parameter b yields immediately the δ function δ(k ⊥1 − k ′ ⊥1 ).…”

Section: E Scattering On a Macroscopic Atomic Targetmentioning

confidence: 99%

“…From a theoretical viewpoint, the Rayleigh scattering has attracted much interest as one of the simplest second-order quantum electrodynamical (QED) process [4]. From a practical viewpoint, detailed knowledge of the properties of elastically scattered photons has been found important for applications in material research [5], medical imaging [6], and astrophysics [7].…”

Section: Introductionmentioning

confidence: 99%

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Rayleigh scattering of twisted light by hydrogenlike ions

Peshkov¹,

Volotka²,

Surzhykov³

et al. 2018

Phys. Rev. A

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The elastic Rayleigh scattering of twisted light and, in particular, the polarization (transfer) of the scattered photons have been analyzed within the framework of second-order perturbation theory and Dirac's relativistic equation. Special attention was paid hereby to the scattering on three different atomic targets: single atoms, a mesoscopic (small) target, and a macroscopic (large) target, which are all centered with regard to the beam axis. Detailed calculations of the polarization Stokes parameters were performed for C 5+ ions and for twisted Bessel beams. It is shown that the polarization of scattered photons is sensitive to the size of an atomic target and to the helicity, the opening angle, and the projection of the total angular momentum of the incident Bessel beam. These computations indicate more that the Stokes parameters of the (Rayleigh) scattered twisted light may significantly differ from their behaviour for an incident plane-wave radiation.

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“…where we have used the transition amplitude (6). Here the integration over the impact parameter b yields immediately the δ function δ(k ⊥1 − k ′ ⊥1 ).…”

Section: E Scattering On a Macroscopic Atomic Targetmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rayleigh scattering of twisted light by hydrogenlike ions

Peshkov¹,

Volotka²,

Surzhykov³

et al. 2018

Phys. Rev. A

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“…Johns and Wismayer (2004) reported that a degree of variation existed in the form factor values obtained using different diffractometers. Elshemey et al (1999) used a Monte Carlo simulation code employing measured molecular form factors by Peplow and verghese (1998) in order to examine the possibility of tissue characterization of several biological samples.…”

mentioning

confidence: 99%

“…In this work, a Monte Carlo simulation code is modified so that it becomes capable of simulating x-ray scattering from mixed two-component samples. The code is compared with the old version (Elshemey et al 1999) for x-ray scattering from single-component samples. It is also compared with practical measurements for single and mixed biological samples with predefined components percentages by volume.…”

mentioning

confidence: 99%

Monte Carlo simulation of x-ray scattering for quantitative characterization of breast cancer

Elshemey

Elsharkawy

2009

Phys. Med. Biol.

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In the last decade there has been growing interest in the possibility of characterizing breast cancer using differences in the coherent x-ray-scattering profiles of normal and malignant tissues. To a great extent, characterization has depended on the differences in the peak positions of both tissues in addition to the overall profile which exhibits a distinctive sharp adipose peak in the case of a normal breast. In many excised tissue samples, breast cancer samples may be mixed with a variable percentage of other tissues which affect the shape of the x-ray-scattering profile and consequently the ability to characterize the tissue. Moreover, fibroglandular tissue produces a scattering profile showing an extent of similarity to breast cancer. The present study introduces a Monte Carlo simulation code capable of tracing photon transport inside a mixed two-component sample. The code is utilized to simulate and best fit x-ray-scattering profiles of the measured samples. This provides reliable breast tissue characterization in addition to a quantitative estimate of the percentage of each component in a given sample. It is expected that the present simulation would potentially enhance the characterization of breast cancer using the x-ray-scattering technique.

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“…[1][2][3][4] O crescente interesse em tais medidas deve-se à natureza característica do espalhamento coerente da radiação. Dessa forma, LAXS de amostras biológi-cas, como o sangue e seus componentes, têm importância nos campos da biologia e medicina.…”

Section: Introductionunclassified

Estudo de perfil de espalhamento usando difração de raios X de amostras de sangue irradiadas

Pinto

Figueiras

Mendonça

et al. 2008

Rev. Bras. Hematol. Hemoter.

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Artigo / ArticleIntrodução Nas últimas décadas, muitos autores têm realizado medidas de perfis de espalhamento a baixo ângulo (LAXS) de amostras biológicas. [1][2][3][4] O crescente interesse em tais medidas deve-se à natureza característica do espalhamento coerente da radiação. Dessa forma, LAXS de amostras biológi-cas, como o sangue e seus componentes, têm importância nos campos da biologia e medicina. Por meio do LAXS entende-se a estrutura molecular da amostra obtendo-se uma assinatura que é característica do material em estudo.O espalhamento coerente das amostras biológicas é dominado pelo perfil da água, 5,6 já que os tecidos biológicos são em grande parte compostos desse elemento. A remoção da água por liofilização produz espectros consideravelmente diferentes das amostras não liofilizadas. Essa técnica, também conhecida como desidratação a frio (freeze dry) é um eficiente processo de secagem de amostras biológicas que preserva células, enzimas, vacinas, vírus, soros e derivados sangüíneos. Na liofilização, as amostras biológicas são submetidas a baixa temperatura e pressão, fazendo com que a água presente se transforme em gelo que, em seguida, devido à baixa pressão, sublimará.A caracterização de amostras liofilizadas (irradiadas e não irradiadas) de sangue total, matriz celular e plasma foi realizada através da obtenção de perfis de espalhamento coerente de raios X. As medidas foram realizadas no Laboratório de Instrumentação Nuclear, LIN/Coppe/UFRJ. Esse trabalho tem por objetivo a compreensão dos perfis de espalhamento coerente de raios X dos principais componentes

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Characteristics of low-angle x-ray scattering from some biological samples

Cited by 20 publications

References 29 publications

Rayleigh scattering of twisted light by hydrogenlike ions

Rayleigh scattering of twisted light by hydrogenlike ions

Monte Carlo simulation of x-ray scattering for quantitative characterization of breast cancer

Estudo de perfil de espalhamento usando difração de raios X de amostras de sangue irradiadas

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