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1

Image processing techniques for roi identification in rheumatoid arthritis patients from thermal images

Wasilewska A., Pauk J., Ihnatouski M.

Acta Mechanica et Automatica

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2018

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Vol. 12, no. 1

49--53

EN

Rheumatoid arthritis (RA) is a systemic autoimmune disease that manifests itself by joint inflammation, swelling, pain, tenderness and may involve extra-articular organs in severe cases. Joint inflammatory lesions are associated with higher temperature due to increased vascularity in the area of inflamed tissues. This papers aimed to identify heat patterns from ROIs to interpret the presence of inflammation in rheumatoid arthritis patients. The thermovisual image sequences were collected from 65 patients with Rheumatoid Arthritis (RA). Infrared images were generated by a thermal scanning camera (FLIR E60bx Systems Inc., USA). Separate recordings of left and right foot temperature changes were performed for 3 minute periods. The temperature measurement was performed at the moment right after cold water immersion (post-cooling temperature) and at the moment after thermal recovery (post-recovery temperature). The recording of 3-minute foot thermal recovery was used for analysis. Automatically identified ROI corresponds to the area of the soft tissues covering cuboid and navicular bone.

2

Research of the spatial-temporal gait parameters and pressure characteristic in spastic diplegia children

Pauk J., Ihnatouski M., Daunoraviciene K., Laskhousky U., Griskevicius J.

Acta of Bioengineering and Biomechanics

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2016

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Vol. 18, no. 2

121--129

EN

Purpose: Spastic diplegia is the most common form of cerebral palsy. It presents with symmetric involvement of the lower limbs and upper limbs. Children with spastic diplegia frequently experience problems with motor control, spasticity, and balance which lead to gait abnormalities. The aim of this study is twofold. Firstly, to determine the differences in spatial-temporal gait parameters and magnitude of plantar pressure distribution between children with spastic diplegia (CP) and typical children. Secondly, to compare and evaluate main changes of plantar pressure and spatial-temporal gait parameters instead of data between spastic diplegia children with prescribed ankle – solid foot orthosis (AFOs) and without using AFOs. Methods: The evaluation was carried out on 20 spastic diplegia children and 10 agematched children as a control group aged 6–15 years. Twenty children with spastic diplegia CP were divided into two groups: ten subjects with prescribed AFOs and ten subjects without use of assistive device. Patients used the AFOs orthosis for one year. Measurements included in-shoe plantar pressure distribution and spatial-temporal gait parameters. Results: Spatial-temporal gait parameters showed meaningful difference between study groups in velocity, stride length, step length and cadence ( p < 0.05). However no significant differences between patients with and without AFOs were found ( p > 0.05). Significant differences between typical and spastic diplegia children with AFOs were observed in the magnitude of plantar pressure under the toes, the metatarsal heads, the medial arch, and the heel ( p < 0.05). For typical subjects, the highest pressure amplitudes were found under the heel and the metatarsal heads, while the lowest pressure distribution was under the medial arch. In CP patients the lateral arch was strongly unloaded. The peak pressure under heel was shifted inside. Conclusions: Collected data and calculated scores present a state of the gait in test groups, showed the difference and could be valuable for physicians in decision making by choosing qualitative therapy. Furthermore, it allows predicting probability of further possible changes in gait of spastic diplegia patients with AFOs and without it. In conclusion, our current results showed that the use of AFOs, prescribed on a clinical basis by doctors improves gait patterns and gait stability in children with spastic cerebral palsy.

3

Analysis of the plantar pressure distribution in children with foot deformities

Pauk J., Daunoraviciene K., Ihnatouski M., Griskevicius J., Raso J. V.

Acta of Bioengineering and Biomechanics

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2010

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Vol. 12, no. 1

29-34

EN

This paper describes the method of measuring and assessing the pressure distribution under typical feet and the feet of patients with deformities such as: planovalgus, clubfoot, and pes planus using a pedobarograph. Foot pressure distribution was measured during static and walking at individual normal walking speed. Time-series pressure measurements for all sensors were grouped into five anatomical areas of human foot. In typical subjects, the heel was the first part of the foot receiving the loading of the body. Then it moved to the toe through the midfoot and the metatarsal area. The highest mean pressure in typical subjects was found under the heel and the metatarsal heads. The lowest pressure distribution was under the cuboid bone. In the planovalgus subjects, a higher pressure distribution was found under cuboid bone compared to typical one. In the pes cavus subjects, the pressure distribution was lower under all parts of foot. In the clubfoot subjects, the pressure distribution, the contact area of each mask, and the time of foot contact area in left and right foot are respectively different.

4

Analiza rozkładu nacisków pod stopą podczas chodu człowieka

Pauk J., Ihnatouski M.

Modelowanie Inżynierskie

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2009

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T. 7, nr 38

161-165

PL

W pracy przedstawiono charakterystykę 20 dzieci ze stopą prawidłową i 60 dzieci ze stopą płasko-koślawą. Osobom badanym wykonano pomiary rozkładu ciśnienia pod stopą za pomocą systemu baropodometrycznego. Badaniami objęto dzieci z Grodna (Białoruś) i Podlasia w wieku 8-15 lat.

EN

The aim of our study was to estimate underfoot pressure distribution in typical subject, and patients with flat feet. The measurement was taken for 105 children aged between 8-15 years. The pedobarographic system with shoe insoles was used for this measurement. Foot pressure distribution was measured during walking at individual normal walking speed. Time-series pressure measurements for all sensors were grouped into five anatomical areas. Foot pressure distribution was highly significantly different between areas in typical subjects and patients with flat feet.

5

On the relationship between optical and structural properties of polymer films modified by carbon micro and nanopartciles

Kovalevskaya T., Ihnatouski M., Sviridenok A., Zhdanok S., Krauklis A., Voina V., Stepuro A.

Acta Mechanica et Automatica

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2008

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Vol. 2, no. 4

51-56

EN

The studies were concentrated on investigations of optical and structural characteristics of polymeric films filled by carbon micro and nanoparticles. Light transmission in the region of visible spectra of the films based on gelatin and polyvinyl alcohol was found to be almost independent of the wavelength. Carbon particles appeared to have no intrinsic absorption bands within the UV region. In the case of aggregation, nanotubes start to form clusters with an optical fractal structure, while the films display spatial fluctuations in transparency accompanied by deviations from the Bourguer-Lambert-Beer law. In contrast to nanoparticles, microparticles reduce the roentgen level of crystallinity of the films.

6

Biomechanical analysis of anthropometric and functional zones on human plantar at walking

Ihnatouski M., Sviridenok A., Lashkovski V., Krupicz B.

Acta Mechanica et Automatica

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2008

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Vol. 2, no. 4

19-23

EN

The methods of representing barometric information obtained by the pressure measuring instruments of the human plantar onto the contact surface during walking have been developed. The presentation of barometric data in terms of time and phase variables along with the patterns of data elements makes grounds for analyzing independently of of the type of the barometric instrument.