najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМО10.17586/2220-8054-2025-16-1-5-13najo-23Research ArticlePHYSICSФИЗИКАPhase-contrast method for determining the size of the effective focal spot of a nanofocus X-ray tubeФазоконтрастный метод определения размера эффективного фокусного пятна нанофокусной рентгеновской трубкиhttps://orcid.org/0009-0009-8428-9588МанушкинА. А.ManushkinA. A.

Alexey A. Manushkin

Volgogradskiy, 42, Moscow, 109316

manushkinaa@mail.ruhttps://orcid.org/0000-0001-8806-0603ПотраховН. Н.PotrakhovN. N.

Nikolay N. Potrakhov

Professora Popova, 5, St. Petersburg, 197022

nnpotrahov@etu.ruhttps://orcid.org/0000-0002-6284-0246КостринД. К.KostrinD. K.

Dmitrii K. Kostrin

Professora Popova, 5, St. Petersburg, 197022

dkkostrin@mail.ruhttps://orcid.org/0000-0002-4968-7857ГукК. К.GukK. K.

Karina K. Guk

Professora Popova, 5, St. Petersburg, 197022

kkguk@etu.ru“Diagnostika-M” LLCRussian FederationSaint Petersburg Electrotechnical University “LETI”Russian Federation202501062025161513Copyright © Manushkin A.A., Potrakhov N.N., Kostrin D.K., Guk K.K., 20252025Манушкин А.А., Потрахов Н.Н., Кострин Д.К., Гук К.К.Manushkin A.A., Potrakhov N.N., Kostrin D.K., Guk K.K.This work is licensed under a Creative Commons Attribution 4.0 License.https://nanojournal.ifmo.ru/jour/article/view/23

The work is devoted to the development of a method for testing the focal spot size of nanofocus and microfocus X-ray tubes based on phase contrast radiography of test objects. The method is based on the comparison of the interference X-ray image with the calculated values obtained by the exact numerical solution of the wave equation. The high sensitivity of the method to the size of the source is ensured by the fusion of interference fringes with contrast of different signs. The formation of X-ray phase contrast images of test objects is analyzed on the basis of the wave equation using numerical modeling of the intensity profile. An analytical expression has been obtained to estimate the size of the X-ray tube focus. The results of calculations of phase contrast profiles for a nylon fishing line and a reference nanofocus test are presented.

Работа посвящена развитию метода тестирования размера фокусного пятна нанофокусных и микрофокусных рентгеновских трубок на основе фазоконтрастной рентгенографии тестовых объектов. В основе метода лежит сопоставление интерференционного рентгеновского изображения с расчетными значениями, полученными при точном численном решении волнового уравнения. Высокая чувствительность метода к размерам источника обеспечивается слиянием интерференционных полос с контрастом разного знака. На основе волнового уравнения с использованием численного моделирования профиля интенсивности проанализировано формирование рентгеновских фазоконтрастного изображения тестовых объектов. Получено аналитическое выражение для оценки размера фокуса рентгеновской трубки Приведены результаты расчетов профилей фазового контраста для капроновой лески и эталонного нанофокусного теста.

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The authors declare that there are no conflicts of interest present.