Geoscientific process monitoring with positron emission tomography (GeoPET)

Kulenkampff, Johannes; Gründig, Marion; Zakhnini, Abdelhamid; Lippmann-Pipke, Johanna

doi:10.5194/se-7-1217-2016

Cited by 17 publications

(10 citation statements)

References 49 publications

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“…The principles of PET applications to geoscientific process studies have previously been described in detail 31 . Our PET scanner (ClearPET; Elysia-Raytest, Straubenhardt, Germany) exploits the physical resolution limit with voxel sizes of 1.15 mm 3 at a maximum field-of-view of 136 mm (145 × 145 × 95 voxels), fully suitable for core-scale process tomography 32 .…”

Section: Methodsmentioning

confidence: 99%

Time-lapse 3D imaging by positron emission tomography of Cu mobilized in a soil column by the herbicide MCPA

Kulenkampff

Stoll

Gründig

et al. 2018

Sci Rep

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Phenoxyalkanoic acids like the 4-chloro-2-methylphenoxyacetic acid (MCPA) are the second highest used xenobiotic herbicides worldwide after glyphosate because of their apparently favorable environmental properties. Experimental batch equilibration data suggested a reduced Cu adsorption efficiency with the soil mineral goethite below pH 6 in presence of MCPA. This has been verified by advanced surface complexation adsorption modelling involving dissolved Cu-MCPA complexation constants. Positron emission tomography is a non-invasive molecular imaging method for time-resolved three-dimensional information commonly applied on non-retarded tracers in soil core scale experiments. Mineral surface reactive tracers like Cu-64 are too immobile for the relatively short observation times available with this advanced imaging technique. However, Cu-64 radiolabeled Cu-MCPA complex migration could be observed in as long as 10-cm artificial soil test columns where break-through occurred within a few days. For the first time, time-lapse movies of Cu migration in the opaque soil columns were recorded using this novel reactive transport process tomography approach.

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Section: Methodsmentioning

confidence: 99%

Time-lapse 3D imaging by positron emission tomography of Cu mobilized in a soil column by the herbicide MCPA

Kulenkampff

Stoll

Gründig

et al. 2018

Sci Rep

Self Cite

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“…Heterogeneity evaluation was performed based on changes in the tracer concentration in which a zone with higher concentration identified as more heterogeneous. Later, they reviewed and discussed applications of PET in geoscientific studies and presented examples of monitoring advection and diffusion processes [ 316 ]. They introduced their upgraded PET scanner having higher resolution (1 mm) and sensitivity than the medical scanners and with a larger FOV (maximum diameter and length: 160 mm and 110 mm).…”

Section: Applications Of Micromodels and Imaging Techniquesmentioning

confidence: 99%

Review of Microfluidic Devices and Imaging Techniques for Fluid Flow Study in Porous Geomaterials

Jahanbakhsh

Wlodarczyk

Hand

et al. 2020

Sensors

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Understanding transport phenomena and governing mechanisms of different physical and chemical processes in porous media has been a critical research area for decades. Correlating fluid flow behaviour at the micro-scale with macro-scale parameters, such as relative permeability and capillary pressure, is key to understanding the processes governing subsurface systems, and this in turn allows us to improve the accuracy of modelling and simulations of transport phenomena at a large scale. Over the last two decades, there have been significant developments in our understanding of pore-scale processes and modelling of complex underground systems. Microfluidic devices (micromodels) and imaging techniques, as facilitators to link experimental observations to simulation, have greatly contributed to these achievements. Although several reviews exist covering separately advances in one of these two areas, we present here a detailed review integrating recent advances and applications in both micromodels and imaging techniques. This includes a comprehensive analysis of critical aspects of fabrication techniques of micromodels, and the most recent advances such as embedding fibre optic sensors in micromodels for research applications. To complete the analysis of visualization techniques, we have thoroughly reviewed the most applicable imaging techniques in the area of geoscience and geo-energy. Moreover, the integration of microfluidic devices and imaging techniques was highlighted as appropriate. In this review, we focus particularly on four prominent yet very wide application areas, namely “fluid flow in porous media”, “flow in heterogeneous rocks and fractures”, “reactive transport, solute and colloid transport”, and finally “porous media characterization”. In summary, this review provides an in-depth analysis of micromodels and imaging techniques that can help to guide future research in the in-situ visualization of fluid flow in porous media.

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“…Soils and sediments are highlighted here, as they are more intimately linked with biological processes in environmental systems relative to geological media (e.g., rocks). For a thorough review of PET applications and experimental considerations in geological systems, the reader is referred to Zahasky et al 15 and Kulenkampff et al 121 …”

Section: Positron Imaging—soils and Sedimentsmentioning

confidence: 99%

From the Outside in: An Overview of Positron Imaging of Plant and Soil Processes

et al. 2020

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Positron-emitting nuclides have long been used as imaging agents in medical science to spatially trace processes non-invasively, allowing for real-time molecular imaging using low tracer concentrations. This ability to non-destructively visualize processes in real time also makes positron imaging uniquely suitable for probing various processes in plants and porous environmental media, such as soils and sediments. Here, we provide an overview of historical and current applications of positron imaging in environmental research. We highlight plant physiological research, where positron imaging has been used extensively to image dynamics of macronutrients, signalling molecules, trace elements, and contaminant metals under various conditions and perturbations. We describe how positron imaging is used in porous soils and sediments to visualize transport, flow, and microbial metabolic processes. We also address the interface between positron imaging and other imaging approaches, and present accompanying chemical analysis of labelled compounds for reviewed topics, highlighting the bridge between positron imaging and complementary techniques across scales. Finally, we discuss possible future applications of positron imaging and its potential as a nexus of interdisciplinary biogeochemical research.

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Geoscientific process monitoring with positron emission tomography (GeoPET)

Cited by 17 publications

References 49 publications

Time-lapse 3D imaging by positron emission tomography of Cu mobilized in a soil column by the herbicide MCPA

Time-lapse 3D imaging by positron emission tomography of Cu mobilized in a soil column by the herbicide MCPA

Review of Microfluidic Devices and Imaging Techniques for Fluid Flow Study in Porous Geomaterials

From the Outside in: An Overview of Positron Imaging of Plant and Soil Processes

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