Dieter Suter’s research while affiliated with TU Dortmund University and other places

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Publications (12)


Functional MR Imaging in Real-Time using a sliding-window correlation technique
  • Article

May 1998

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7 Reads

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9 Citations

NeuroImage

D. Gembris

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J.G. Taylor

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S. Schor

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[...]

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S. Posse

Funktionale Kernspintomographie Sliding-Window Echtzeit-Korrelationsanalyse

January 1998

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8 Reads

In dieser Arbeit werden Korrelations-Algorithmen vorgestellt, die die Erstellung funktionaler Karten des Gehirns aus Kern-spintomographie(MR)-Daten in Echtzeit während eines laufenden Scan-Vorgangs erlauben. Ausgehend von einem Optimierungsproblem werden Formeln für die Berechnung von Korrelationskoeffizienten zwischen den Zeitreihen der MR-Datensätze und Modell-Zeitreihen hergeleitet. Die Formeln unterstützen „Detrending“, das heißt die Unterdrückung von nicht-stimulus induzierten Signaländerungen, wie zum Beispiel Drifts. Mathematisch wird dies durch die Subtraktion einer Linear-Kombination von Basis-Vektoren erreicht. Bei den vorgestellten Algorithmen, die in unserer FIRE-Software (Functional Imaging in REal-time) implementiert wurden, läßt sich die Korrelationsberechnung auf die N letzten Datensätze beschränken, wobei N < Anzahl der aufgenommenen Datensätze ist (Sliding-Window-Technik).


Citations (9)


... One could analyse how world records evolved over time and compare the progress made in given athletic events. 21 To take a view on long-term trends in athletic performances this is certainly a valid methodology. However, to compare the general level of performance in any given year or period looking at the prevailing world records would provide a biased view. ...

Reference:

Internationalization, competitiveness and performance in athletics (1984–2006)
Evolution of Athletic Records
  • Citing Article
  • July 2007

... It is the study of the statistical properties of particularly large or small values within a data set. EVA is widely applied in various fields where extreme phenomena hold significant importance, such as engineering, meteorology, finance, insurance, and environmental science (Basnayake et al 2019;de Haan and Ferreira 2006;Dong 2016;Einmahl and Magnus 2008;Gembris et al. 2002;Kratz 2017;Rootzen 2017;Songchitruksa and Tarko 2006;Tippett et al. 2016;Tsuduki 2024;Wong and Collins 2020). The central concepts of EVA involve identifying the largest or smallest values in a dataset, determining whether these extremes follow distributions like the Fréchet distribution, Weibull distribution, or Gumbel distribution, and analyzing data points that exceed specific thresholds to estimate their distribution. ...

Trends and random fluctuations in athletics
  • Citing Article
  • May 2002

... The physical laws that govern the dynamics of this substance are expressed as a set of partial differential equations (PDEs), which are solved numerically on the diffusion tensor field to produce a metric of connectivity. Early work in this area focused on developing methods modeled on the simple diffusion of heat or water through the image volume, whose dynamics is computed by solving the first order heat equation on the diffusion tensor field [41]- [43]. These methods have the advantages of level set and probabilistic methods and are based the same physical model used to construct the diffusion tensor field. ...

Solving the diffusion equation for fiber tracking in the living human brain
  • Citing Article
  • January 2001

... In general, there are several characteristics, such as: The basic gradient technique is often applied to machine learning, as detailed in [22]. Creating a multidimensional plane is an effective classification method [23]. ...

Functional magnetic resonance imaging in real time (FIRE): Sliding‐window correlation analysis and reference‐vector optimization
  • Citing Article
  • February 2000

Magnetic Resonance in Medicine

... Based on the fact that the concentration (or density) fluctuation of an ideal diffusive medium is governed entirely by the diffusion equation (a partial-derivative description of Fick's law [17]), a natural strategy to reveal the spatio-temporal diffusion process is to obtain the numerical solution of the diffusion equation [18]. Previous attempts to employ this strategy, however, have not been successful due to their limitations in practical implementations, such as the 2-D or partial-brain calculation domain requirements as stated in [18][19][20]. Xu et al. [21] recently employed an improved numerical method to diffusion-weighted Bloch-Torrey equation in simulating diffusion MRI measurements on biological tissues, yet not presented the macroscopic evolution of the diffusive concentration. In this paper, we present a method to map the 3-D spatio-temporal diffusion process in the entire brain based on the numerical solution of the diffusion equation, and then compare with an IOI study. ...

A first-principles approach for diffusion tensor based fiber tracking
  • Citing Article
  • June 2001

NeuroImage

... Applying such methods online would imply that the incremental computation time increases on each new scan, which is clearly a serious drawback when considering real-time constraints. To overcome this problem, some techniques were proposed that compute the correlation between the signal and the model, either in an incremental fashion [2], or by restricting computations to a sliding time window [3]. ...

Functional Magnetic Resonance Imaging in Real-Time (FIRE)
  • Citing Article
  • February 2000

... In competitive sports, achieving a new world record is always gratifying. However, it's not just about representing the pinnacle of a specific sports specialty, it's crucial to assess the valuable information and patterns behind the record [1]. Sports records, over time, follow a monotonic function on a time scale and spatial function [2]. ...

Evolution of Athletic Records: Statistical Effects versus Real Improvements
  • Citing Article
  • June 2007

... It is the study of the statistical properties of particularly large or small values within a data set. EVA is widely applied in various fields where extreme phenomena hold significant importance (Coles 2001;Gilleland and Katz 2016), such as disaster prevention (de Haan and Ferreira 2006;Tippett et al. 2016), finance (Kratz 2019), safety estimation (Songchitruksa and Tarko 2006), sports (Einmahl and Magnus 2008;Gembris et al. 2002), human lifespan (Dong et al. 2016;Rootzen and Zolud 2017), and the recent pandemic (Wong and Collins 2020). Recently, its applications in the biological data analysis has also become active (Basnayake et al. 2019;Tsuduki 2024). ...

Sports statistics: Trends and random fluctuations in athletics
  • Citing Article
  • June 2002

Nature