Field ion microscopy (FIM), transmission electron microscopy (TEM) and computer simulation techniques have been used to experimentally investigate the field ion image geometry. Electron micrographs and electron diffraction patterns were obtained from tungsten specimens after controlled amounts of field evaporation. From a knowledge of the changes in the image dimensions as a function of the var...

Despite rapid advances in interventional imaging, the navigation of a guide wire through abdominal vasculature remains, not only for novice radiologists, a difficult task. Since this navigation is mostly based on 2D fluoroscopic image sequences from one view, the process is slowed down significantly due to missing depth information and patient motion. We propose a novel approach for 3D dynamic ...

Although catheters are an ideal therapeutic treatment for all patients who need hemodialysis, their placement, use may be followed by certain complications. We present a case of iliac vein lacerations in the projection of the tip of a femoral catheter for hemodialysis in a 55-year-old patient.

PURPOSE To evaluate long-term results in the bilateral cleft lip repair by Mulliken's method, using anthropometric measurements, we assessed the growth of the nose and upper lip after the operation by comparing with those from 30 children without bilateral cleft lip. MATERIALS AND METHODS Forty-four patients had their bilateral cleft lip and nasal deformity repaired simultaneously by Mulliken...

In this dissertation, we present improvements to modeling of tip-steerable needles and new estimation techniques with applications to tip-steerable needles. Previous models of tip-steerable needles assumed the angles and velocities at the tip and base of the needle were equivalent. Such assumptions were simplifying, but not accurate. Additionally, to accurately control the trajectories of tip-s...

BACKGROUND Nasal valve collapse and especially internal nasal valve insufficiency is a common cause of nasal airway obstruction. This study compares the effects of spreader graft and overlapping lateral crural technique on rhinoplasty by rhinomanometry. METHODS Fifty patients were randomly assigned into two groups and underwent spreader graft or overlapping lateral crural technique. Objective...

Sexual differentiation in Schizosaccharomyces pombe is induced from the G1 phase of the cell cycle by nitrogen starvation and the presence of mating pheromones. We describe the distribution of F-actin during sexual differentiation. Cortical F-actin dots have previously been shown to be restricted to one end of the rod shaped cell during the G1 phase of the cell cycle. Within half an hour of nit...

A 19-year-old female patient visited our clinic for rhinoplasty. She complained about her low take-off point, which was apparent in profile view, and wanted slight tip projection. She refused additional cartilage harvesting from ears or ribs but consented to the use of homologous tissue, including acellular dermal matrix, for her dorsum and tip. Septoturbinoplasty was performed, and only a very...

Columella is an important facial component and provides support and projection to the tip of the nose. Columella defects may cause significant aesthetic and functional deformities. We present our case-load of 2007: 61 patients operated in that year had been carried out and concluded. Surgical techniques for the correction of columellar defects were classified as "open tip" and "closed tip". The...