Application of Positron Emission Tomography to Aerosol Transport Research in a Model of Human Lungs

Loading...
Thumbnail Image
Date
2013-04-09
ORCID
Advisor
Referee
Mark
Journal Title
Journal ISSN
Volume Title
Publisher
EDP Sciences
Altmetrics
Abstract
Positron Emission Tomography (PET) is a convenient method for measurement of aerosol deposition in complex models of lungs. It allows not only the evaluation of regional deposition characteristics but also precisely detects deposition hot spots. The method is based on a detection of a pair of annihilation photons moving in opposite directions as a result of positron – electron interaction after the positron emission decay of a suitable radioisotope. Liquid di(2-ethylhexyl) sebacate (DEHS) particles tagged with fluorine-18 as a radioactive tracer were generated by condensation monodisperse aerosol generator. Aerosol deposition was measured for three different inhalation flowrates and for two sizes of particles. Combination of PET with Computed Tomography (CT) in one device allowed precise localisation of particular segments of the model. The results proved correlation of deposition efficiency with Stokes number, which means that the main deposition mechanism is inertial impaction. As a next task the methodology for tagging the solid aerosol particles with radioactive tracer will be developed and deposition of porous and fiber aerosols will be measured.
Pozitronová emisní tomografie (PET) je vhodná metoda pro měření depozice aerosolu ve složitých modelech plic. Umožňuje jak určení regionálních depozičních charakteristik, tak i lokalizaci depozičních ohnisek. Metoda je založena na detekci páru anihilačních fotonů, které se pohybují v opačných směrech jako výsledek interakce elektronu a pozitronu po emisi pozitronů z vhodného radioizotopu. Depozice aerosolu byla měřena pro tři režimy a dvě velikosti částic. Výsledky prokázaly korelaci mezi depoziční účinností a Stokesovým číslem, což znamená, že v měřených režimech je dominantním depozičním mechanismem setrvačný impakt.
Description
Document type
Peer-reviewed
Document version
Published version
Date of access to the full text
Language of document
en
Study field
Comittee
Date of acceptance
Defence
Result of defence
Document licence
Creative Commons Attribution 2.0 Generic
http://creativecommons.org/licenses/by/2.0/
Citace PRO