For positive symmetric matrices, eigenvaues are equal to the respective singular values. Also, eigenvectors match the corresponding SVD orthogonality transformation matrix. We use this and many others matrix properties to check if the new Calcpad works correctly before the official release.
Nedelcho Ganchovski’s Post
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A marked path over digitally reconstructed radiographs forms the basis of virtual fluoroscopy. find it useful, especially in small and fluoro-invisible lesions, particularly when the final 1-2 bifurcations are not clearly shown on CT due to various reasons. The path allows us to adjust our scope trajectory in AP/LAO/RAO fluoroscopy to match the VF path. It is also useful after cryobiopsy when 1-2 bifurcations may be now clotted. Additionally, you can mark your fluoroscopy screen with a marker at the point of rEBUS signal to augment your own fluoroscopy.
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A Ventricular Septal Defect(VSD) from different perspective. Short-axis view of the ventricles along the right ventricular outflow tract in color Doppler with demonstrable blood flow across the interventricular septum (IVS). Short-axis view is very helpful for checking the integrity of interventricular septum and avoiding artifacts.
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The suction-activated GraftNet™ device allows for efficient collection of autologous tissue to incorporate the patient’s own cells into the graft. After mounting the GraftNet tissue collector between the shaver handpiece and the suction system, the autologous osteochondral fragments are collected in an easily accessible, sterile filter chamber. Watch this video as Dr. Rachel M. Frank (Denver, CO) discusses use of the GraftNet device to backfill bone-tendon-bone (BTB) graft harvest sites during ACL reconstruction procedures. https://lnkd.in/eTZyUV4V
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Although numerous anatomical and operative atlases have been published, those that have focused on the skull base either have provided views that are quite difficult to achieve in the operating room to better depict surgical anatomy or are written at the level of an audience with considerable knowledge and experience. Five sides of three formalin-fixed latex-injected specimens were dissected under microscopic magnification. Anatomical dissections were performed until the expected level of dissection quality was achieved to demonstrate each important step of the surgical approach that would be understandable to all trainees of all levels. Following dissection education, representative case applications were reviewed. The posterior necrosectomy (pre sigmoid retrolabyrinthine approach) affords excellent access to cranial nerves III to XI and a diverse array of pathologies. Key steps include positioning and skin incision, scalp and muscle flaps, burr holes, craniotomy flap elevation, superficial mastoidectomy, otic capsule exposure and pre sigmoid dura decompression, primary pre sigmoid durotomy, inferior temporal durotomy, superior petrosal sinus ligation, tentorium sectioning, and final exposure. The posterior petrosectomy is a challenging approach; thorough operative-style laboratory dissection is essential to provide trainees with a suitable guide.
Neurosurgeon and founder, Atlas Meditech and Neurosurgical Atlas | AI, LLM, Computer Vision Enthusiast | Professor, USC/Keck Department of Neurosurgery
In this operative video, I demonstrate a posterior petrosectomy in a cadaver. Extension of the mastoidectomy exposes the air cells and antrum. The cortical bone indicates proximity to the semicircular canals, which are protected. The antrum, cortical bone over the semicircular canals, and sigmoid sinus are viewed. Bone removal continues over the presigmoid dura, while protecting the jugular bulb. Inner ear bones, if exposed, are left intact. Additional bone removal creates space to access the presigmoid dura. The tentorium is cut posterior to the petrous ridge, carefully identifying and protecting the trochlear nerve to prevent injury before extending the dural incision. Learn more here | https://zurl.co/COSN.
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Rapid Field Testing of Ecstasy Pills Using a 1064-nm Handheld Raman Device Fluorescence can limit the Raman detection of colorful substances and mixtures with plant-based narcotics and cutting agents, making it difficult to perform fast, presumptive tests of street samples in the field. TacticID Mobile is a field-ready handheld Raman system utilizing 1064-nm wavelength laser excitation. Designed for forensic analysis, the TacticID Mobile significantly reduces fluorescence, allowing users to identify tough street samples such as ecstasy tablets in a variety of colors and formulations. https://bit.ly/4dIcFS2
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In this operative video, Dr. Cohen demonstrates a posterior petrosectomy in a cadaver. Extension of the mastoidectomy exposes the air cells and antrum. The cortical bone indicates proximity to the semicircular canals, which are protected. The antrum, cortical bone over the semicircular canals, and sigmoid sinus are viewed. Bone removal continues over the presigmoid dura, while protecting the jugular bulb. Inner ear bones, if exposed, are left intact. Additional bone removal creates space to access the presigmoid dura. The tentorium is cut posterior to the petrous ridge, carefully identifying and protecting the trochlear nerve to prevent injury before extending the dural incision. Learn more here | https://zurl.co/EbXt.
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In this operative video, I demonstrate a posterior petrosectomy in a cadaver. Extension of the mastoidectomy exposes the air cells and antrum. The cortical bone indicates proximity to the semicircular canals, which are protected. The antrum, cortical bone over the semicircular canals, and sigmoid sinus are viewed. Bone removal continues over the presigmoid dura, while protecting the jugular bulb. Inner ear bones, if exposed, are left intact. Additional bone removal creates space to access the presigmoid dura. The tentorium is cut posterior to the petrous ridge, carefully identifying and protecting the trochlear nerve to prevent injury before extending the dural incision. Learn more here | https://zurl.co/COSN.
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Macula Star-folds are usually a real nightmare, the PVR is very immature, hard to grasp and the retina could easily cut. In macular folds cases i prefer to start ILM Peeling in an area where there is no PVR, removing the ILM from the free area till the PVR area where the membranes will be also removed. Note in the video how the blood vessels are nicked and hazy due to the membranes above it, and how they come clear after removing the ILM.
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Solution to the quiz: https://lnkd.in/gchbPY9T We see a complete rupture of the supraspinatus tendon with retraction into the supraspinatus fossa. https://lnkd.in/g5KYU9mJ
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Did you know that complete intraluminal wire passage is often not achieved in most long occlusive fem-pop lesions? Discover how IVUS can help you (1,2) https://lnkd.in/gsS57fGX #PAD #SeeClearlyTreatOptimally
SCTO2024_SoMe_1080x1080_2July.mp4
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