Index

Network analysis of soluble factor-mediated autocrine and paracrine circuits in melanoma immunotherapy

Interpolation of ARAMIS Grids and Analysis of Numerical Stability on Deep Learning Methods

Reinforcement Learning in Finance – Add and adapt the DDQN to an existing Reinforcement Learning Framework

Spike Detection in Gradient Coils of MR Scanners using Artificial Intelligence

Introduction

Spikes, also known as herringbone artifact, are a well-known artifact in MRI imaging. They occur
when a hardware component produces an unwanted spark. Spikes are caused by malfunctioning
hardware components and lead to a degraded image quality; therefore, it is important to eliminate
their cause. A common case is gradient coils, which produce rapidly changing magnetic fields with
high amplitude. The aim of this thesis is to develop a deep-learning-based spike detection algorithm
based on multi-channel k-space data.

Methods and data

For this work anonymized clinical data in TWIX format are used provided by Siemens Healthineers.
The dataset contains more than 90 recordings from more than 15 scanners measured with a variety
of different sequences. The recordings are annotated by one expert with a binary label per slice or
partitions for 3D recordings. The label indicates whether a spike is present or not.
The goal of this thesis is to create a deep learning pipeline for the classification of the presence of
spikes. This includes comparing different preprocessing techniques and neural network architectures
(e.g., Res-blocks [1], Inception modules [2] and Dense-blocks [3]) in terms of their performance in
solving the classification task. In addition, their computational performance will also be evaluated.

Evaluation

The following aspects will be evaluated:

Different preprocessing methods (e.g., dimensionality reduction, feature extraction, data
augmentation) will be implemented and compared w.r.t the classification performance
Different model architectures (e.g., Res-blocks, Inception modules, Dense-blocks) will be
implemented and compared w.r.t the classification performance
The classification performance will be evaluated with different metrics and the model’s
decision will be investigated with different attribution methods
The chosen architecture will be analyzed and optimized w.r.t its computational performance

References

[1] HE, Kaiming, et al. Deep residual learning for image recognition. In: Proceedings of the IEEE
conference on computer vision and pattern recognition. 2016. S. 770-778.

[2] SZEGEDY, Christian, et al. Going deeper with convolutions. In: Proceedings of the IEEE
conference on computer vision and pattern recognition. 2015. S. 1-9.

[3] HUANG, Gao, et al. Densely connected convolutional networks. In: Proceedings of the IEEE
conference on computer vision and pattern recognition. 2017. S. 4700-4708.

Classification of Cardiomegaly using X-ray of the chest

The German Phonetic Footprint of Parkinsons Disease

Similarity and duplicate search in artwork images

Similarity and duplicate search in artworks is important in the domain of the art historical studies. It is a very
challenging task even for the art historians, because the image similarity in art depends on different features
like color, texture and style of the artwork [2]. Applying some pretrained deep neural networks like VGG16,
ResNet15 makes it efficient to find similar features between images. However, they have high bias on one of
the features (e.g., focus too much on color) and we usually do not know which features influence most on
similarity search, so they cannot be directly applied on artwork databases.

The goal of this thesis is to implement and evaluate a model based on deep neural networks that can find cor-
related artworks with a custom definition of similarity.