Abstract
A method of diffuse optical tomography (DOT) is described for the direct detection of absorbing and scattering inhomogeneities such as cysts, hematoma, or tumors. DOT can also be used to detect small changes in the oxygenation and deoxygenation of blood in designated regions of the heads of neonates, and in breast cancer. In contrast to the early part of time-resolved transmittance of a femtosecond pulse, late-arriving photons are used for this purpose. A 2D numerical simulation is used for quantitative matching of diffuse model curves to experimental data. The finite difference method is used for computer simulation of movements of a cloud of photons from the surface of an object to its center. The 3D representations of the time point spread functions (TPSF) represent a flat surface in a homogeneous case. Lower parts of the surface indicate the presence of inhomogeneities at the corresponding angles.
Zusammenfassung
Es wird ein Verfahren der diffusen optischen Tomographie (DOT) für den direkten Nachweis von absorbierenden und streuenden Inhomogenitäten wie Zysten, Hämatome oder Tumoren beschrieben. Die DOT kann auch verwendet werden, um kleine Änderungen in der Oxygenierung und Desoxygenierung von Blut beispielsweise in bestimmten Schädelregionen von Neugeborenen oder bei Brustkrebs zu detektieren. Im Gegensatz zum frühen Teil der zeitaufgelösten Transmission eines Femtosekundenpulses werden hierfür spät ankommende Photonen betrachtet. Zur quantitativen Anpassung der diffusen Modellkurven an die experimentellen Daten wird eine zweidimensionale numerische Simulation verwendet. Die Finite-Differenzen-Methode wird für die Computersimulation der Bewegungen einer Photonenwolke von der Oberfläche eines Objekts zu dessen Mitte eingesetzt. Die dreidimensionalen Darstellungen der zeitlichen Antwortfunktionen (TPSF) repräsentieren (im homogenen Fall) eine flache Oberfläche. Die unteren Teile der Oberfläche weisen auf das Vorhandensein von Inhomogenitäten bei entsprechenden Winkeln hin.
This project is supported by the Russian Federation State Grant for Young Scientists (contract 9576p/14219) and Grant of the President of the Russian Federation (SP-4213.2013.4).
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Articles in the same Issue
- Masthead
- Masthead
- Editorial
- Current research on photonics and lasers in medicine in Russia
- Announcement
- New steps forward: Application for impact factor and free online access for better citations
- Magazine section
- Snapshots
- Original contributions
- Study of laser-induced autofluorescence emission spectra from normal and malignant bronchial epithelium/Untersuchung der laser-induzierten Autofluoreszenz-Emissionsspektren von normalem und malignem Bronchialepithel
- Application of high-resolution label-free imaging methods to obtain tissue images for histological analysis/Anwendung hochauflösender markierungsfreier Bildgebungsverfahren zur histologischen Analyse von Gewebebildern
- The assessment of pathological changes in cerebral blood flow in hypertensive rats with stress-induced intracranial hemorrhage using Doppler OCT: Particularities of arterial and venous alterations/Die Beurteilung von pathologischen Veränderungen der Hirndurchblutung bei hypertensiven Ratten mit Stress-induzierten intrakraniellen Blutungen mittels Doppler-OCT: Besonderheiten von arteriellen und venösen Veränderungen
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