Integración de procesos de fotogrametría en sistemas de tratamiento de la información raster y vectorial

The correlation methods presented here use 3D image processing techniques to set up virtual stereo models and integrate them in spatial digital information systems. The coordinates of any selected point are made available more accurately than by methods of photogrammetric restitution, and the user requires no training in stereoscopy. The metrical and documentary information generated here, in comparison with what is current, is better suited for the development of geo-spatial engineering projects. It is also of a quality to improve the execution of projects using automatic machinery. The developed techniques enable the project designer to build his data base interactively as part of the geometric design process.Los procesos de correlación que se presentan tienen como objetivo configurar estéreo-modelos virtuales y su integración en sistemas de información mediante técnicas de tratamiento de imágenes en modo 3D. El resultado de estos desarrollos permite calcular las coordenadas de los puntos, directamente seleccionados por el usuario, con un nivel de precisión superior al que se obtiene en los métodos de restitución fotogramétrica y sin necesidad de un adiestramiento previo en estereoscopía. Estos procedimientos generan una información métrica y documental más adecuada para la elaboración del proyecto y contribuyen a mejorar la ejecución de obras con maquinas automáticas. Poder configurar la base de datos de forma interactiva con el diseño geométrico del proyecto es la conclusión más relevante de estos desarrollos

The impact of surgical delay on resectability of colorectal cancer: An international prospective cohort study

AimThe SARS-CoV-2 pandemic has provided a unique opportunity to explore the impact of surgical delays on cancer resectability. This study aimed to compare resectability for colorectal cancer patients undergoing delayed versus non-delayed surgery.MethodsThis was an international prospective cohort study of consecutive colorectal cancer patients with a decision for curative surgery (January-April 2020). Surgical delay was defined as an operation taking place more than 4 weeks after treatment decision, in a patient who did not receive neoadjuvant therapy. A subgroup analysis explored the effects of delay in elective patients only. The impact of longer delays was explored in a sensitivity analysis. The primary outcome was complete resection, defined as curative resection with an R0 margin.ResultsOverall, 5453 patients from 304 hospitals in 47 countries were included, of whom 6.6% (358/5453) did not receive their planned operation. Of the 4304 operated patients without neoadjuvant therapy, 40.5% (1744/4304) were delayed beyond 4 weeks. Delayed patients were more likely to be older, men, more comorbid, have higher body mass index and have rectal cancer and early stage disease. Delayed patients had higher unadjusted rates of complete resection (93.7% vs. 91.9%, P = 0.032) and lower rates of emergency surgery (4.5% vs. 22.5%, P ConclusionOne in 15 colorectal cancer patients did not receive their planned operation during the first wave of COVID-19. Surgical delay did not appear to compromise resectability, raising the hypothesis that any reduction in long-term survival attributable to delays is likely to be due to micro-metastatic disease