Near infrared image processing to quantitate and visualize oxygen saturation during vascular occlusion.

The assessment of microcirculation spatial heterogeneity on the hand skin is the main objective of this work. Near-infrared spectroscopy based 2D imaging is a non-invasive technique for the assessment of tissue oxygenation. The haemoglobin oxygen saturation images were acquired by a dedicated camera (Kent Imaging) during baseline, ischaemia (brachial artery cuff occlusion) and reperfusion. Acquired images underwent a preliminary restoration process aimed at removing degradations occurring during signal capturing. Then, wavelet transform based multiscale analysis was applied to identify edges by detecting local maxima and minima across successive scales. Segmentation of test areas during different conditions was obtained by thresholding-based region growing approach. The method identifies the differences in microcirculatory control of blood flow in different regions of the hand skin. The obtained results demonstrate the potential use of NIRS images for the clinical evaluation of skin disease and microcirculatory dysfunction.

Cefaleas crónicas / Chronic headache

Las cefaleas crónicas más frecuentes son la vascular y la tensional. Ha habido avances en los últimos años en relación a la patogenia y la incorporación de nuevos tratamientos como los bloqueadores del calcio y los beta bloqueadores en las cefaleas vasculares. La cefalea por tumor es de fácil confirmación diagnóstica gracias a la Tomografía Computarizada de Cerebro. Por esto mismo es importante un análisis semiológico para establecer cuando se sospecha, lo cual se revisa en el presente trabajo. También la arteritis de la arteria temporal, la disfunción témporo-mandibular y otras formas de cefalea menos frecuentes son analizadas en el contexto de su diagnóstico diferencial