Konrad Ciecierski

• PhD
• Professor (Assistant) at NASK National Research Institute

During the Deep Brain Stimulation (DBS) surgery for Parkinson's disease (PD), the main goal is to place the permanent stimulating electrode into an area of the brain that becomes pathologically hyperactive. This area, called Subthalamic Nucleus (STN), is small and located deep within the brain. Therefore, the main challenge is the precise localizat...

Background The Periaqueductal gray (PAG) and the periventricular gray (PVG) are the anatomical targets for deep brain stimulation (DBS) to treat severe, refractory neuropathic pain. Methods Seven (four female and three male) patients were qualified for PAG/PVG DBS because of neuropathic facial pain. Frame-based unilateral implantations of DBS were...

Data classification is one of the most commonly used applications of machine learning. The are many developed algorithms that can work in various environments and for different data distributions that perform this task with excellence. Classification algorithms, just like other machine learning algorithms have one thing in common: in order to opera...

Classification of documents is a task which is rapidly gaining popularity in machine learning application. I can be used for such tasks as detection of spam, detection of phishing attempts or for detection of fake messages. One of the areas where document classification is of growing importance is automatic assessment of civic, legal and government...

Deep learning algorithms are rapidly growing and powerful algorithms that achieve very high results in tasks such as image classification, recognition or segmentation, speech recognition, and many others. The disadvantage of using these methods is that they often need a lot of computational resources. The significant development of mobile devices h...

Deep brain stimulation (DBS) is a neurosurgical procedure successfully used to treat conditions such as Parkinson's disease. Electrostimulation, carried out by implanting electrodes into an identified focus in the brain, makes it possible to reduce the symptoms of the disease significantly. In this paper, a method for analyzing recordings of neuron...

Knowledge of the location of nerve tracts during the surgical preoperative planning stage and during the surgery itself may help neurosurgeons limit the risk of causing neurological deficits affecting the patient’s essential abilities. Development of MRI techniques has helped profoundly with in vivo visualization of the brain’s anatomy, enabling to...

In the neurobiological mechanism of Parkinson’s Disease (PD), a certain part of the brain called the Subthalamic Nucleus (STN) becomes overactive. This pathologically increased activity inhibits other regions of the brain, causing many symptoms observed in PD patients. The hyperactivity of the STN can be lowered using a special electrical stimulati...

During the analysis of neurobiological signals acquired during neurosurgical procedures such as Deep Brain Stimulation, one focuses mainly on the signal's background and spiking activity. Spikes, the electrical impulses generated by neuron cells, are events lasting about 1.5 ms with voltage typically well below 200 µV. As the shape of spike derives...

Digital signal processing -- such as filtering, information extraction, and fusion of various results -- is currently an integral part of advanced medical therapies. It is especially important in neurosurgery during deep-brain stimulation procedures. In such procedures, the surgical target is accessed using special electrodes while not being direct...

Basal Ganglia (BG) are functional areas within human brain that are target for various deep brain stimulation (DBS) surgeries. During DBS surgery a permanent stimulating electrode is placed within selected part of the BG. One of the methods of localization of the selected part of the BG is based upon analysis of recordings obtained from BG using th...

In many cases of neurophysiological data analysis, the best results can be obtained using supervised machine learning approaches. Such very good results were obtained in detection of neurophysiological recordings recorded within Subthalamic Nucleus (\({ STN}\)) during deep brain stimulation (DBS) surgery for Parkinson disease. Supervised machine le...

Basal ganglia are a target for deep brain stimulation (DBS) in various neurological disorders like Parkinson’s Disease (PD) or Dystonia. Due to the complex excitatory and inhibitory interactions between various components of basal ganglia, it is often as much important to stimulate certain regions as it is not to stimulate others. Such is the case...

Analysis of registered signals is often a basis for decision making in various automation or decision support systems. Signals may contain noise and artifacts that are produced either by an environment or just are due to the method of their acquisition. In many cases, when the acquired signal is too contaminated, it is simply recorded once more. In...

Functional neurosurgery is used for treatment of conditions in central nervous system that arise from its improper physiology. One of the possible approaches is Deep Brain Stimulation (DBS). In this procedure a stimulating electrode is placed in desired brain’s area to locally affect its activity. Among others, DBS can be used as a treatment for dy...

During deep brain stimulation (DBS) surgery for Parkinson disease, the target is the subthalamic nucleus (STN). STN is small, (\(9\times 7\times 4\) mm) and typically localized by a series of parallel microelectrodes. As those electrodes are in steps advanced towards and through the STN, they record the neurobiological activity of the surrounding t...

During deep brain stimulation (DBS) surgery for Parkinson disease, the target is the subthalamic nucleus (STN). STN is small, (9 x 7 x 4 mm) and typically localized by a series of parallel microelectrodes. As those electrodes are in steps advanced towards and through the STN, they record the neurobiological activity of the surrounding tissues. By c...

During deep brain stimulation (DBS) treatment of Parkinson’s disease, the anatomical target of the surgery is a small (9 x 7 x 4 mm) deeply located structure called the Subthalamic Nucleus (STN). It is similar morphologically to the surrounding tissue and as such, not easily distinguished in CT or MRI. The goal of the surgery is precise placement o...

In neurosurgical treatment of the Parkinson Disease (PD) the target is a small (9 x 7 x 4 mm) deep within brain placed structure called SubthalamicNucleus (STN). The goal of the Deep Brain Stimulation (DBS) surgery is the permanent precise placement of the stimulating electrode within target nucleus. As this structure poorly discriminates in CT or...

When analyzing the neurobiological data many of its aspects have to be carefully looked upon. Data coming from the MRI, EMG or microrecording all have its special properties that have to be extracted during the process analysis. In case of recordings coming from the microrecording procedure i.e. from microelectrodes placed within the neuronal tissu...

During deep brain stimulation (DBS) treatment of Parkinson disease, the target of the surgery is the subthalamic nucleus (STN). This anatomical structure is small (9 x 7 x 4 mm) and poorly visible using Computer Tomography (CT) or Magnetic Resonance Imaging (MRI) scans. Because of that, a multi-electrode micro recording system is used intra surgica...

During deep brain stimulation (DBS) treatment of Parkinson disease, the target of the surgery is a small (9 x 7 x 4 mm) deep within brain placed structure called Subthalamic Nucleus (STN). It is similar morphologically to the surrounding tissue and as such poorly visible in CT or MRI. The goal of the surgery is the permanent precise placement of th...

During deep brain stimulation (DBS) treatment of Parkinson disease, the target of the surgery is the subthalamic nucleus (STN). As STN is small (9 x 7 x 4 mm) and poorly visible in CT4 or MRI5, multi-electrode micro recording systems are used during DBS surgery for its better localization. This paper presents five different analytical methods, that...

Deep brain stimulation (DBS) of the subthalamic nucleus (STN) is effective treatment of Parkinson disease. Because the STN is small (9×7×4mm) and it is not well visible using conventional imaging techniques, multi-microelectrode recordings are used to ensure accurate detection of the STN borders. Commonly used discriminations which microelectrode's...

Deep brain stimulation (DBS) of the subthalamic nucleus (STN) is effective treatment of Parkinson disease. Because the STN is small (9 ×7 ×4 mm) and it is not well visible using conventional imaging techniques, multi-microelectrode recordings are used to ensure accurate detection of the STN borders. Commonly used discriminations which microelectrod...