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Simulating a Ground Truth for Transit Time Analysis of Indicator Dilution Curves

Reiß, Michael; Naber, Ady; Nahm, Werner

Abstract:
Transit times of a bolus through an organ can provide valuable information for researchers, technicians and clinicians. Therefore, an indicator is injected and the temporal propagation is monitored at two distinct locations. The transit time extracted from two indicator dilution curves can be used to calculate for example blood flow and thus provide the surgeon with important diagnostic information. However, the performance of methods to determine the transit time Δt cannot be assessed quantitatively due to the lack of a sufficient and trustworthy ground truth derived from in vivo measurements. Therefore, we propose a method to obtain an in silico generated dataset of differently subsampled indicator dilution curves with a ground truth of the transit time. This method allows variations on shape, sampling rate and noise while being accurate and easily configurable. COMSOL Multiphysics is used to simulate a laminar flow through a pipe containing blood analogue. The indicator is modelled as a rectangular function of concentration in a segment of the pipe. Afterwards, a flow is applied and the rectangular function will be diluted. Shape varying dilution curves are obtained by discrete-time measurement of the average dye concentration over different cross-sectional areas of the pipe. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000132304
Veröffentlicht am 03.05.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Biomedizinische Technik (IBT)
Karlsruhe School of Optics & Photonics (KSOP)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 09.2020
Sprache Englisch
Identifikator ISSN: 2364-5504
KITopen-ID: 1000132304
Erschienen in Current directions in biomedical engineering
Verlag De Gruyter
Band 6
Heft 3
Seiten 268–271
Schlagwörter indicator dilution curves, ground truth transit time, in silico model
Nachgewiesen in Scopus
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