High-resolution magnetotelluric studies of the Archaean-Proterozoic border zone in the Fennoscandian Shield, Finland

Abstract Intramyocardial sympathetic nerve remodeling after myocardial infarction (MI) has been implicated in adverse outcomes such as sudden arrhythmic death, yet the underlying mechanisms are poorly understood. We sought to examine microstructural remodeling of ventricular myocardium and cardiac sympathetic nerve fibers after chronic infarction and to correlate this remodeling with perturbations in electrical conduction. We developed a high-resolution pipeline for anatomically precise alignment of optical action potential maps with structural maps of myofiber and nerve fiber features detected by customized computer vision algorithms. Using this integrative approach in a mouse model of chronic MI, we identified distinct structure-function correlates of discontinuous electrical propagation to objectively define the infarct border zone. During sympathetic activation induced by tyramine administration, we also discovered regional patterns of altered impulse propagation directly associated with altered neuroeffector junction distribution, pointing to potential substrates for neurally mediated arrhythmogenesis. This study establishes a synergistic framework for examining structure-function relationships after MI with unprecedented spatial precision, which has implications for advancing our understanding of arrhythmogenic substrates and mechanisms.

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Abstract 2233: Comparison of Anatomical and Dynamic CT-derived Parameters between Scar, Border Zone and Healthy Myocardium in Patients Undergoing Ischemic VT Ablation

Circulation ◽

10.1161/circ.118.suppl_18.s_690 ◽

2008 ◽

Vol 118 (suppl_18) ◽

Author(s):

Jing Tian ◽

Mark F Smith ◽

Aharon Turgeman ◽

Aharon Abbo ◽

Patricia Bruce ◽

...

Keyword(s):

High Resolution ◽

Wall Thickness ◽

Blood Pool ◽

Border Zone ◽

Wall Thickening ◽

3D Mapping ◽

Clinical Criteria ◽

Additional Information ◽

High Resolution Ct ◽

Vt Ablation

Background: Image integration in commerically available 3D mapping systems is currently only used for surface reconstruction of the blood pool/endocardial interface and does not provide any additional information about the myocardial scar substrate. Anatomic and dynamic data is available from high-resolution CT scans that could potentially identify scar and border zone and facilitate ventricular tachycardia ablations. Methods: Ten patients with ischemic cardiomypathy underwent contrast-enhanced cardiac CT prior to VT ablation. End-systole wall thickness (ESWT), end-diastole wall thickness (EDWS), wall thickening (WT) and wall motion (WM) were extracted from phase-specific, high-resolution CT. Using a 17 segment model CT criteria were compared with endocardial voltages using the standard clinical criteria of normal (<1.5mV) or abnormal myocardium (<1.5mV) as well as scar (<0.5mV) and border zone (0.5–1.5mV). As proof-of-concept, endo/epicardial surfaces were reconstructed from the CT datasets and co-registered in a 3D mapping system to guide intra-procedural voltage mapping. Results: 50% of segments were homogenous, containing only voltages of one of the predefined voltage groups, and used for further analysis (26 abnormal/34 normal segments). EDWT, ESWT, WT and WM were 5.8±0.4mm, 5.7±0.6mm, 0±4% and 1.0±0.3mm for abnormal and 8.1±0.5mm, 10.9±0.7mm, 35.7±6.6% and 2.7±0.6mm for healthy segments, respectively. All four parameters differed significantly (P<0.05) between healthy and abnormal segments. In subgroup analyses, EDWT, ESWT, WT and WM were 6.8±1.4mm, 7.0±2.1, 0±14% and 1.3±1.1mm for scar and 4.0±1.0m, 3.7±1.2mm, 0±11%mm and 0.0±0.0mm for border zone segments. All parameters differed significantly between scar and healthy (P<0.05), border zone and healthy (P<0.05) segments respectively. Registration of endo/epicardial surfaces allowed the intraprocedural assessment of wall thickness and correctly predicted areas of abnormal endocardial voltage. Conclusions: CT derived anatomic and dynamic parameters showed significant differences between voltage-defined normal and abnormal myocardium. Representation of such parameters such as wall thickness may facilitate the intraprocedural substrate characterization.

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Delineating new foot trails within the US-Mexico border zone using semi-automatic linear object extraction methods and very high resolution imagery

Journal of Spatial Science ◽

10.1080/14498596.2010.487852 ◽

2010 ◽

Vol 55 (1) ◽

pp. 81-100 ◽

Cited By ~ 4

Author(s):

S. Lathrop ◽

D. Stow ◽

L. Coulter ◽

A. Hope

Keyword(s):

High Resolution ◽

Extraction Methods ◽

Border Zone ◽

Object Extraction ◽

High Resolution Imagery ◽

The Us ◽

Mexico Border ◽

Linear Object ◽

Very High Resolution Imagery ◽

Very High

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Evaluation of deep geothermal exploration drillings in the crystalline basement of the Fennoscandian Shield Border Zone in south Sweden

Geothermal Energy ◽

10.1186/s40517-021-00203-1 ◽

2021 ◽

Vol 9 (1) ◽

Author(s):

Jan-Erik Rosberg ◽

Mikael Erlström

Keyword(s):

Thermal Properties ◽

Feasibility Studies ◽

Crystalline Basement ◽

Fennoscandian Shield ◽

Border Zone ◽

Rotary Drilling ◽

Drilling Performance ◽

Geological Conditions ◽

Air Drilling ◽

South Sweden

AbstractThe 3.1- and 3.7-km-deep FFC-1 and DGE-1 geothermal explorations wells drilled into the Precambrian crystalline basement on the southern margin of the Fennoscandian Shield are evaluated regarding experiences from drilling, geological conditions, and thermal properties. Both wells penetrate an approximately 2-km-thick succession of sedimentary strata before entering the crystalline basement, dominated by orthogneiss, metabasite and amphibolite of the (1.1–0.9 Ga) Eastern Interior Sveconorwegian Province. The upper c. 400 m of the basement is in FFC-1 severely fractured and water-bearing which disqualified the use of percussion air drilling and conventional rotary drilling was, therefore, performed for the rest of the borehole. The evaluation of the rotary drillings in FFC-1 and DGE-1 showed that the average bit life was very similar, 62 m and 68 m, respectively. Similarly, the average ROP varied between 2 and 4 m/h without any preferences regarding bit-type (PDC or TCI) or geology. A bottomhole temperature of 84.1 °C was measured in FFC-1 borehole with gradients varying between 17.4 and 23.5 °C/km for the main part of the borehole. The calculated heat flow varies between 51 and 66 mW/m2 and the average heat production is 3.0 µW/m3. The basement in FFC-1 is, overall, depleted in uranium and thorium in comparison to DGE-1 where the heat productivity is overall higher with an average of 5.8 µW/m3. The spatial distribution of fractures was successfully mapped using borehole imaging logs in FFC-1 and shows a dominance of N–S oriented open fractures, a fracture frequency varying between 0.85 and 2.49 frac/m and a fracture volumetric density between 1.68 and 3.39 m2/m3. The evaluation of the two boreholes provides insight and new empirical data on the thermal properties and fracturing of the concealed crystalline basement in the Fennoscandian Shield Border Zone that, previously, had only been assessed by assumptions and modelling. The outcome of the drilling operation has also provided insight regarding the drilling performance in the basement and statistical data on various drill bits used. The knowledge gained is important in feasibility studies of deep geothermal projects in the crystalline basement in south Sweden.

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The role of three-dimensional reconstructions in understanding the intersegmental plane: an anatomical study of segment 6

European Journal of Cardio-Thoracic Surgery ◽

10.1093/ejcts/ezaa123 ◽

2020 ◽

Vol 58 (4) ◽

pp. 763-767

Author(s):

Matthieu Sarsam ◽

Matthieu Glorion ◽

Julien de Wolf ◽

Francesco Cassiano ◽

Philippe Puyo ◽

...

Keyword(s):

High Resolution ◽

Three Dimensional ◽

Anatomical Study ◽

Respiratory Function Tests ◽

Border Zone ◽

Ct Scans ◽

3 Dimensional ◽

Significant Difference ◽

Volume Measurements ◽

Intersegmental Plane

Abstract OBJECTIVES The identification of the intersegmental plane during lung segmentectomies remains a practical difficulty, notably with minimally invasive approaches. The intraoperative techniques are based on demarcating either the bronchial or the vascular territories. The goal of this study was to evaluate the use of 3-dimensional reconstructions in understanding the intersegmental plane of segment 6. METHODS Between March and September 2018, Synapse 3-dimensional programme was used to carry out bilateral venous, arterial and bronchial segmentations of segment 6. All computed tomography (CT) scans were contrast-enhanced and of a high resolution (0.6 mm slices). The patients had normal results on respiratory function tests. The volumes obtained from each of the 3 modalities were then compared. The results are presented as mean and standard deviation and as median and interquartile ranges for lung volume measurements. RESULTS During the aforementioned period, 15 high-resolution chest CT scans were selected (8 men and 7 women). The median age was 70 years. In all of the studied segments (N = 30, 15 right S6 and 15 left S6), the segmental volume of the vein was greater than the segmental volumes of the bronchus and the artery. A significant difference was found between the segmental volumes obtained from the 3 modalities (P = 0.001). The segmental volume of the vein was significantly higher than the segmental volume of the bronchus (P < 0.001) and the segmental volume of the artery (P < 0.001). On the other hand, the segmental volume of the artery was significantly higher than the segmental volume of the bronchus (P = 0.01). CONCLUSIONS Within the limits of this study, the segmental venous volume of S6 was greater than the volumes of the segmental bronchial and arterial volumes. Thus, depending solely on bronchial techniques might lead to leaving a border zone in venous congestion.

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Evaluation of Deep Geothermal Exploration Drillings in the Crystalline Basement of the Fennoscandian Shield Border Zone in South Sweden.

10.21203/rs.3.rs-579919/v1 ◽

2021 ◽

Author(s):

Jan-Erik Rosberg ◽

Mikael Erlström

Keyword(s):

Thermal Properties ◽

Feasibility Studies ◽

Crystalline Basement ◽

Fennoscandian Shield ◽

Border Zone ◽

Rotary Drilling ◽

Drilling Performance ◽

Geological Conditions ◽

Air Drilling ◽

South Sweden

Abstract The 3.1 and 3.7 km deep FFC-1 and DGE-1 geothermal explorations wells drilled into the Precambrian crystalline basement on the southern margin of the Fennoscandian Shield are evaluated regarding experiences from drilling, geological conditions, and thermal properties. Both wells penetrate an approximately two-kilometre-thick succession of sedimentary strata before entering the crystalline basement, of granitoid gneiss, metabasite and amphibolite of the (1.1–0.9 Ga) Eastern Interior Sveconorwegian Province. The upper c. 400 m of the basement is in FFC-1 severely fractured and water-bearing which disqualified the use of percussion air drilling and conventional rotary drilling was therefore performed for the rest of the borehole. The evaluation of the rotary drillings in FFC-1 and DGE-1 gave that the average bit life was very similar, 62 m respectively 68 m as well as an average ROP between 2 and 4 m/h without any preferences regarding bit-type (PDC or TCI) or geology. A bottomhole temperature of 84.1 °C in FFC-1 borehole with gradients varying between 17.4 °C/km and 23.5 °C/km for the main part of the borehole. The calculated heat flow varies between 51 and 66 mW/m2 and the average heat production is 3.0 µW/m3. The basement is in FFC-1 overall depleted of uranium and thorium in comparison to DGE-1 where the heat productivity is overall higher with an average of 5.8 µW/m3. The spatial distribution of fractures was successfully mapped using borehole imaging logs in FFC-1 and shows a dominance of N–S oriented open fractures, a fracture frequency varying between 0.85 and 2.49 frac/m and a fracture volumetric density between 1.68 and 3.39 m2/m3. The evaluation of the two boreholes provides insight and new empirical data on the thermal properties and fracturing of the concealed crystalline basement in the Fennoscandian Shield Border Zone that previously only been assessed by assumptions and modelling. The outcome of the drilling operation has also provided insight regarding the drilling performance of the basement and statistical data on various drill bits used. Properties and experiences which are all important in feasibility studies of deep geothermal project in the crystalline basement in south Sweden.

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Observations of the spatial structure of interstellar hydrogen

Symposium - International Astronomical Union ◽

10.1017/s007418090010066x ◽

1967 ◽

Vol 31 ◽

pp. 45-46

Author(s):

Carl Heiles

Keyword(s):

High Resolution ◽

Spatial Structure ◽

Velocity Dispersion ◽

Temperature Variations

High-resolution 21-cm line observations in a region aroundlII= 120°,b11= +15°, have revealed four types of structure in the interstellar hydrogen: a smooth background, large sheets of density 2 atoms cm-3, clouds occurring mostly in groups, and ‘Cloudlets’ of a few solar masses and a few parsecs in size; the velocity dispersion in the Cloudlets is only 1 km/sec. Strong temperature variations in the gas are in evidence.

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Combining integrated systems-biology approaches with intervention-based experimental design provides a higher-resolution path forward for microbiome research

Behavioral and Brain Sciences ◽

10.1017/s0140525x18002911 ◽

2019 ◽

Vol 42 ◽

Author(s):

J. Alfredo Blakeley-Ruiz ◽

Carlee S. McClintock ◽

Ralph Lydic ◽

Helen A. Baghdoyan ◽

James J. Choo ◽

...

Keyword(s):

Systems Biology ◽

High Resolution ◽

Experimental Design ◽

Integrated Systems ◽

Microbiome Research ◽

Constructive Criticism

Abstract The Hooks et al. review of microbiota-gut-brain (MGB) literature provides a constructive criticism of the general approaches encompassing MGB research. This commentary extends their review by: (a) highlighting capabilities of advanced systems-biology “-omics” techniques for microbiome research and (b) recommending that combining these high-resolution techniques with intervention-based experimental design may be the path forward for future MGB research.

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Very High Resolution Analysis of the Dynamics of a Coronal Plasmoid

International Astronomical Union Colloquium ◽

10.1017/s0252921100026117 ◽

1994 ◽

Vol 144 ◽

pp. 593-596

Author(s):

O. Bouchard ◽

S. Koutchmy ◽

L. November ◽

J.-C. Vial ◽

J. B. Zirker

Keyword(s):

High Resolution ◽

Solar Eclipse ◽

Total Solar Eclipse ◽

Field Of View ◽

Small Field ◽

High Resolution Analysis ◽

Ccd Observations ◽

Resolution Analysis ◽

Very High ◽

Small Field Of View

AbstractWe present the results of the analysis of a movie taken over a small field of view in the intermediate corona at a spatial resolution of 0.5“, a temporal resolution of 1 s and a spectral passband of 7 nm. These CCD observations were made at the prime focus of the 3.6 m aperture CFHT telescope during the 1991 total solar eclipse.

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