THE purpose of this paper is to demonstrate an improved method of suturing corneal grafts. Technically, the first few sutures are especially difficult and frequently the graft suffers undesirable damage. This becomes quite obvious when one sees in the literature the multitude of devices available for fixing the donor graft. With the corneal transplant technique described below, trauma to the ti...

OBJECTIVE To measure and compensate for soft tissue deformation during image-guided neurosurgery, we have developed a novel approach to estimate the three-dimensional (3-D) topology of the cortical surface and track its motion over time. METHODS We use stereopsis to estimate the 3-D cortical topology during neurosurgical procedures. To facilitate this process, two charge-coupled device camera...

An accelerating voltage of 100-300kV remains a good choice for the majority of TEM or STEM specimens, avoiding the expense of high-voltage microscopy but providing the possibility of atomic resolution even in the absence of lens-aberration correction. For specimens thicker than a few tens of nm, the image intensity and scattering contrast are likely to be higher than at lower voltage, as is the...

Coronavirus belong to a large family of virus called Coronaviridae predominantly affects respiratory system. Virus that cause COVID-19, spreads mainly by droplet infection from oral or nasal secretions. Clinical presentation starts with fever, headache, cough, malaise and gastro- intestinal symptoms. Loss taste smell have been reported. Most the patients recover milder symptoms, few reported or...

P. H. Penteado,1,2 F. M. Souza,2 A. C. Seridonio,3 E. Vernek,2 and J. C. Egues1 1Instituto de Fı́sica de São Carlos, Universidade de São Paulo, 13560-970, São Carlos, SP, Brazil 2Instituto de Fı́sica, Universidade Federal de Uberlândia, 38400-902, Uberlândia, MG, Brazil 3Departamento de Fı́sica e Quı́mica, Universidade Estadual Paulista Júlio de Mesquita Filho, 15385-000, Ilha Solteira, SP, Brazil....

In computer-assisted surgery (CAS), optical digitizing is state-of-the-art. Unfortunately standard navigation instruments, e.g. small, LED-equipped pointers are frequently shadowed by the operating microscope when the camera-array is ceiling- or rack-mounted. Thus, for microsurgery, a navigation module consisting of a reference panel mounted onto the housing of the microscope and an object dist...

The aim of this project is to provide a Mixed (Augmented and Virtual) Reality platform, both educational, preand intraoperative purposes. The architecture is based on a prototype of a stereoscopic Augmented Reality (AR) microscope for ergonomic intra-operative presentation of complex preoperative three-dimensional structure (obtained by real patient’s images) for neurosurgical interventions rea...