Simone Hufnagel was awarded the prize for the best oral presentation at this year's meeting of the German chapter of the "International Society for Magnetic Resonance in Medicine (ISMRM)". In her talk Simone Hufnagel presented a method for the determination of 3D quantitative parameter maps of the heart. This method provides important diagnostic information about the myocardium not only...
The accurate dimensional and analytical characterization of aerosols - finely dispersed particles in gases such as air - is of increasing importance for environmental research, but also in industry. During the International Aerosol Conference (IAC 2022, https://iac2022.gr/) as well as the French Aerosol Conference...
Whether for the realization of the low-temperature scale or for processes in the semiconductor industry: Many applications in physics and technology use vacuum technology, and especially the possibility to measure even the smallest pressures precisely and traceably. For his fundamental work in the field of vacuum pressure measurement, Dr. Karl...
Forschende lieben mehrdeutige Abkürzungen. Und daher war die PTB mit ELVIS beim Tag der offenen Tür im Bundesministerium für Wirtschaft und Klimaschutz (BMWK) in Berlin vertreten. Einen sexy Hüftschwung sollte man jedoch nicht erwarten, denn ELVIS steht für „Electric Vehicle Charger Inspection System“ und ist ein neuartiges mobiles Messsystem für die E-Mobilität.
Artificial intelligence and machine learning tools hold promise to assist or drive high-stakes decisions in areas such as finance, medicine, or autonomous driving. The upcoming AI Act will require that the principles by which such algorithms arrive at their predictions should be transparent. However, the field of XAI is lacking formal problem specifications and theoretical results. In a new study,...
Active implantable medical devices (AIMDs), such as cardiac pacemakers, have already been implanted in millions of patients worldwide. However, individuals with AIMDs still face limitations in accessing state-of-the-art MRI technology due to the potential risks involved. This restriction is due to the fact that MR scanners employ powerful radiofrequency fields which can result in tissue burns...
Der WELMEC Guide 7.2 „Software“ ist der am meisten genutzte Leitfaden der WELMEC und liegt jetzt in einer aktualisierten und überarbeiteten Version 2023 vor. Dieser Guide bietet europäischen Notified Bodies, Herstellern von Messgeräten und den Überwachungsbehörden abgestimmte technische Interpretationen der grundlegenden Anforderungen der europäischen Messgeräterichtline (MID und der...
Die Erzeugung von Laserlicht wird aufwändiger und schwieriger je kürzer die benötigte Wellenlänge ist. Im Fachbereich Zeit und Frequenz der PTB wurde jetzt ein Lasersystem im Vakuum-Ultravioletten Spektralbereich bei 150 nm zur Anregung eines Übergangs im Thorium-229 Atomkern in Betrieb genommen. Diese Kernresonanz ist von besonderem Interesse für eine neuartige, hochgenaue optische Uhr. In ersten...
Andreas Kofler (PTB) published together with Fabian Altekrüger (TU Berlin), Fatima Antarou Ba (TU Berlin), Christoph Kolbitsch(PTB), Evangelos Papoutsellis (Finden Ltd), David Schote (PTB), Clemens Sirotenko (WIAS), Felix Frederik Zimmermann (PTB) and Kostas Papafitsoros (QMUL) an article in SIAM Imaging Sciences.
The article describes a new method for learning regularization parameter-maps...
The scientific journal “Surface Topography: Metrology and Properties (STMP)” has awarded the research results described in the publication “Bottom-up approach for traceable calibration of tip geometry of stylus profilometer” as “Paper of the Year 2022”.
Andreas Kofler (PTB) published together with Kirsten Kerkering (PTB), Laura Göschel (Charité-Unviersitätsmedizin Berlin), Ariane Fillmer (PTB) and Christoph Kolbitsch (PTB) an article in IEEE Transactions on Biomedical Engineering.
The article describes a new method for obtaining quantitative MR parameters using adaptive dictionary learning and sparse coding. Instead of applying dictionary...
Brachytherapy is a specific tumor therapy using ionizing radiation where a radioactive source is positioned in the vicinity of, or in close contact with human tissue. It is often applied in the treatment of cervical, prostate, esophageal, lung and breast cancer. By irradiating the cancer cells directly, transmission through healthy tissue is not required, as in the case of external radiation beam...
When a real measurement procedure is reproduced by simulations, it may be referred to as a “virtual measurement”. From a metrological point of view, the question is how to ensure confidence in such virtual measurements. While methods to estimate diverse sources of error in simulations have been developed over the past decades, there has to date been no accepted strategy for meeting the...
Hydrogen plays an important role for the decarbonization of the energy sector. In its gaseous form, it is stored at pressures of up to 1000 bar at which real gas effects become relevant. To capture these effects in numerical simulations, accurate real gas models are required. We propose new correlation equations for relevant hydrogen properties …
Arbeiten der AG 8.51 „Metrologische Software“ erlauben eine effizientere Modellierung von Softwaresystemen mit dem Ziel deren funktionalen Eigenschaften im Modell zu prüfen.
Zur Modellierung der funktionalen Eigenschaften von Softwaresystemen werden immer häufiger künstliche neuronale Netze eingesetzt. Diese ermöglichen es, das Verhalten von Softwaresystemen mittels eines maschinellen...
Damit die PTB ihre Aufgaben im Bereich der Metrologie mit Synchrotronstrahlung wieder vollumfänglich erfüllen kann, hat das Helmholtz-Zentrum Berlin (HZB) bereits am 3. Juli den Betrieb von BESSY II exklusiv für die PTB wieder aufgenommen.
If an electrical device, or even a simple cable or electrode, is used in an MRI or in its immediate vicinity, this device may interact with the strong electromagnetic fields of the MRI. The consequences can be MR images distorted to the point of uselessness, destroyed equipment and, in the worst case, even injuries to the patient in the scanner. Especially small manufacturers with innovative...
Das diesjährige 323. PTB-Seminar „Aktuelle Fortschritte von Kalibrierverfahren im Nieder- und Hochfrequenzbereich“ fand am 10. Mai 2023 als hybrides Seminar statt. Mit insgesamt 153 Teilnehmenden, 107 davon PTB-extern aus den Bereichen akkreditierter Kalibrierlaboratorien und industrieller Messgerätehersteller, stieß die Veranstaltung wie bereits in den vergangenen Jahren auf große Resonanz.
On May 23, 2023 this year's QUNOM (Quantification of Uncertainties in Nano Optical Metrology) workshop welcomed participants from different European countries. It was hosted by the XUV group at the University of Twente and co-organized by Dr. Sebastian Heidenreich (PTB Working Group 8.43 Modelling and Simulation) and Dr. Victor Soltwisch (Working Group 7.14 EUV Nanometrology).
At PTB, numerous doctoral projects are successfully completed each year thanks to an attractive supervision concept for doctoral students. The new website "Dissertations" is dedicated to these impressive scientific contributions of PTB's PhD students and offers a comprehensive insight into the progress made in the field of metrology. This page provides a daily updated overview of the research...
When a real measurement procedure is reproduced by simulations, it may be referred to as a “virtual measurement”. From a metrological point of view, the question is how to ensure confidence in such virtual measurements. While methods to estimate diverse sources of error in simulations have been developed over the past decades, there has to date been no accepted strategy for meeting the...
Hydrogen plays an important role for the decarbonization of the energy sector. In its gaseous form, it is stored at pressures of up to 1000 bar at which real gas effects become relevant. To capture these effects in numerical simulations, accurate real gas models are required. We propose new correlation equations for relevant hydrogen properties …
Dissertations