Bildgebung und Mikroskopie

Light microscopy enables fascinating insights into the microcosm of life. It is one of the key techniques in life science and provides access to a better understanding of biology across many orders of magnitude in time and space. The use of visible light allows for minimally invasive imaging - even of living cells - and direct observation with the human eye. However, the use of visible light limits the resolution of the image obtained to about half the wavelength of the used light. The limiting ...

The invention relates to a new method to reduce acquisition time in MR imaging. It is based on the variation of the sensitivity profile of the RF coils and allows an easy access to an additional source of spatial information to further improve imaging.
MR imaging is among the most important tools for modern medical diagnostics with a unique range of applications. The imaging duration however limits the applicability for situations with movements within the volume of interest. Therefore, many ...

The invention relates to a new method for processing magnetic resonance (MR) data based on a neural network (NN). After training, the NN quickly delivers high quality CEST images with low computational effort. Additionally, it provides uncertainty data aiding to judge the images appropriately.

Typically, sophisticated MR contrasts are calculated based on complex mathematical models, which is computationally expensive, and it requires long processing durations. Besides that, the results ...

Cryo-Electron Microscopy (Cryo-EM) today is revolutionizing biological research by revealing the structure of cells and proteins with atomic resolution and steadily improving contrast. However, the quality of the results depends critically on the sample preparation. High Pressure Freezing (HPF) and plunge freezing, both pioneered in the 1960s, still represent the state-of-the-art in sample preparation for cryo-EM. Both methods have poor timing precision, disrupt the natural environment of the ...

The MINSTED method is an innovative technique for determining the position of a singularized fluorophore molecule within an object. Traditional methods in molecular imaging faced challenges in achieving high resolution due to limitations in fluorescence microscopy. Existing solutions like STED (Stimulated Emission Depletion) microscopy improved the spatial resolution but rely on high illumination intensity and/or sample exposure, which can lead to thermal issues and photochemical reactions. MINSTED ...

A group of scientists at the MPI for Polymer Research in Mainz developed nano-graphene structures that can be used as a new class of fluorophores for super-resolution microscopy (SMLM and STED).

They perform like hybrids of organic dyes and QDs: they have excellent environment-independent blinking properties, emit high photon numbers, display high photo-stability, possess low toxicity, have a molecular size below 2 nm, and have narrow excitation and emission spectra.

These nanographene ...

The state of an electron is completely defined by its momentum and spin. In processes like electron diffraction or photoemission electron ensembles are generated which have a characteristic 3D distribution of momentum and spin. To examine such events the three components of the momentum vector have to be measured. Up to now, the momentum distribution of an ensemble of charged particles was typically measured using energy-dispersive spectrometers based on sequential approaches (sequentially changing ...

Fluorescent dyes are widely used as indispensable markers in biology, optical microscopy, and analytical chemistry. In particular, the sensitive and stable imaging of cellular components depends on the favourable combination of chemical, biological and physical factors. The availability and proper choice of fluorescent dyes is a key factor to success in the entire labelling and imaging procedure. Due to their superior brightness and photostability, synthetic dyes represent an attractive alternative ...

The invention relates to a method for wavefront correction in adaptive optics compatible with laser scanning microscopy based on reflected light and deep neural networks. For network training sample aberrations are generated in the excitation and detection path by means of spatial light modulators, and the corresponding reflected focus images are recorded by CMOS cameras. After training, the network can disentangle and independently correct excitation and detection aberrations. The predicted aberration ...

Fluorescence microscopy is one of the key techniques in the life and materials sciences, with applications ranging from routine diagnostics to state-of-the-art research investigations. Key to this success has been its intrinsic advantages combined with continuous improvement in its fundamental features such as resolution, speed, and sensitivity.

Two key challenges are fast single-fluorophore imaging of multi-color samples. This need arises in a broad range of settings such as very high-resolution ...