Prof. Marcela Iregui Guerrero Profile

Prof. Marcela Iregui Guerrero

at Univ Militar Nueva Granada

SPIE Involvement:

Author

Proceedings Article | 17 November 2017 Paper

Quantifying stimulus-response rehabilitation protocols by auditory feedback in Parkinson's disease gait pattern

Gustavo Pineda, Angélica Atehortúa, Marcela Iregui, Juan García-Arteaga, Eduardo Romero

Proceedings Volume 10572, 105720B (2017) https://doi.org/10.1117/12.2285975

KEYWORDS: Gait analysis, Video, Parkinson's disease, Basal ganglia

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External auditory cues stimulate motor related areas of the brain, activating motor ways parallel to the basal ganglia circuits and providing a temporary pattern for gait. In effect, patients may re-learn motor skills mediated by compensatory neuroplasticity mechanisms. However, long term functional gains are dependent on the nature of the pathology, follow-up is usually limited and reinforcement by healthcare professionals is crucial. Aiming to cope with these challenges, several researches and device implementations provide auditory or visual stimulation to improve Parkinsonian gait pattern, inside and outside clinical scenarios. The current work presents a semiautomated strategy for spatio-temporal feature extraction to study the relations between auditory temporal stimulation and spatiotemporal gait response. A protocol for auditory stimulation was built to evaluate the integrability of the strategy in the clinic practice. The method was evaluated in transversal measurement with an exploratory group of people with Parkinson’s (n = 12 in stage 1, 2 and 3) and control subjects (n =6). The result showed a strong linear relation between auditory stimulation and cadence response in control subjects (R=0.98 ±0.008) and PD subject in stage 2 (R=0.95 ±0.03) and stage 3 (R=0.89 ±0.05). Normalized step length showed a variable response between low and high gait velocity (0.2> R >0.97). The correlation between normalized mean velocity and stimulus was strong in all PD stage 2 (R>0.96) PD stage 3 (R>0.84) and controls (R>0.91) for all experimental conditions. Among participants, the largest variation from baseline was found in PD subject in stage 3 (53.61 ±39.2 step/min, 0.12 ± 0.06 in step length and 0.33 ± 0.16 in mean velocity). In this group these values were higher than the own baseline. These variations are related with direct effect of metronome frequency on cadence and velocity. The variation of step length involves different regulation strategies and could need others specific external cues. In conclusion the current protocol (and their selected parameters, kind of sound time for training, step of variation, range of variation) provide a suitable gait facilitation method specially for patients with the highest gait disturbance (stage 2 and 3). The method should be adjusted for initial stages and evaluated in a rehabilitation program.

Proceedings Article | 26 January 2017 Paper

Quantifying the gait pattern adaptation to auditory feedback in healthy elder adults

Gustavo Pineda, Marcela Iregui, Angélica Atehortúa , Eduardo Romero

Proceedings Volume 10160, 101600H (2017) https://doi.org/10.1117/12.2256942

KEYWORDS: Gait analysis, Temporal coherence, Phase shifts, Beam propagation method, Video, Cameras, Visualization, Biological research, Algorithm development, Image processing algorithms and systems

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Proceedings Article | 22 December 2015 Paper

Spanish language generation engine to enhance the syntactic quality of AAC systems

Cristian Narváez A., Sebastián Sastoque H., Marcela Iregui G.

Proceedings Volume 9681, 96810S (2015) https://doi.org/10.1117/12.2211435

KEYWORDS: Telecommunications, Multimedia, Data storage, Quality systems, Receivers, Computing systems, Data modeling, Navigation systems, Televisions, Astatine

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Proceedings Article | 28 January 2015 Paper

Towards ontology personalization to enrich social conversations on AAC systems

Daniela Mancilla V., Sebastian Sastoque H., Marcela Iregui G.

Proceedings Volume 9287, 92870Z (2015) https://doi.org/10.1117/12.2073865

KEYWORDS: Telecommunications, Data storage, Multimedia, Data modeling, Data communications, Receivers, Brain, Logic, Cognitive modeling, Systems modeling

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Proceedings Article | 19 November 2013 Paper

Concurrent access to a virtual microscope using a web service oriented architecture

Germán Corredor, Marcela Iregui, Viviana Arias, Eduardo Romero

Proceedings Volume 8922, 89220T (2013) https://doi.org/10.1117/12.2035424

KEYWORDS: Visualization, Microscopy, Web services, Image resolution, Microscopes, Image quality, Databases, Image compression, Solids, Computer architecture

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Proceedings Article | 25 March 2011 Paper

Efficient access to compressed 3D and 4D MRI using JPEG2000

Tatiana Noreña Ospina, Marcela Iregui, Jorge Victorino, Eduardo Romero

Proceedings Volume 7967, 79670O (2011) https://doi.org/10.1117/12.878411

KEYWORDS: Image compression, JPEG2000, Magnetic resonance imaging, Wavelets, Medical imaging, 3D image processing, Anisotropy, 3D acquisition, Brain, Diagnostics

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Showing 5 of 6 publications

Conference Committee Involvement (1)

Tenth International Symposium on Medical Information Processing and Analysis

14 October 2014 | Cartagena de Indias, Colombia

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