Signal and Image Processing in Biomedical Applications using Machine Learning

Dear Colleagues,

The dramatic improvement in biomedical sensing technology has allowed us to acquire more and better information about the human body. The data sources encompass an enormous spectrum of areas, ranging from large phenomena, such as human gait analysis from wearable sensors or eye movement analysis for disease detection, to nano scale phenomena, such as cell identification in histological microscopy or observing bone growth using microCT imaging. Hence, signal and image processing techniques have a central role in the extraction of meaningful information from such sources. In fact, advancements in signal and image processing techniques have allowed us to obtain improvements at a faster pace than the evolution of hardware. Such improvements, in such a wide landscape of data sources, have enhanced the need for advanced and specific technologies, tailored to each situation, either to improve quality or to estimate high-level information.

In addition, in recent years, artificial intelligence has been shown to offer high-performance mechanisms to deal with these situations, offering robust data models that are able to cope with large, non-linear data spaces. Training algorithms have also become increasingly efficient, being able to keep up with the evolution of data models. Good generalization capabilities and high fidelity can be achieved, even with apparently limited or sparse data. Many of these systems outperform human capacities and their use is becoming an established standard.

However, with such a fast evolution pace, the application landscape continues to grow while many challenges are still open. For each type of signal or image source, improvements can be pursued on:

• Data collection, compression and visualization;
• Data exploration;
• Feature extraction, selection, enhancement and analysis;
• Data augmentation;
• Model selection, tuning and explainability;
• Transfer learning;
• Parameter space exploration.

The possibility of improving disease detection or enhancing therapies, boosting the quality of life of many people, makes this one of the most exciting current research areas.

In this Special Issue, prospective authors are invited to submit innovative research aimed to solve challenges in application areas such as, inter alia, clinical (diagnostic, rehabilitation, monitoring) and biomedical research (histology, anatomy, physiology) and human–machine interfacing (acquisition technologies, stimulation). Some of the encompassed data sources include, but are not limited to, the following:

• Signals: EEG, EMG, ECG, EOG, electroretinogram (ERG), evoked potentials, local field potentials, deep brain stimulation (open/closed-loop), magnetoencephalography (MEG), actigraphy, gait analysis;
• Medical imaging: X-ray, PET, CT or micro-CT, PET-CT, MRI, SPECT;
• Biological and molecular imaging: photoacoustic/coherence tomography (PAT/OCT), MRS, mass spectrometry, optical imaging, phase-contrast imaging, laser scanning confocal microscopy (LSCM);
• Human–machine interaction: wearable data (gaze, dynamics, heart rate), stimulation (touch, vision), emotion, disease, altered states (drunk, sleepiness).

Each small step can represent an enormous advance in clinical outcomes.

Dr. Luis Coelho
Prof. Dr. João Paulo Ramos Teixeira
Dr. Dimitris Glotsos
Dr. Abeer Alsadoon
Guest Editors

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• signal processing
• image processing
• machine learning