Search results for "tomography"
showing 10 items of 2332 documents
An Innovative Weightbearing Device for Weightbearing 3-Dimensional Imaging for Foot and Ankle Surgery Preoperative Planning.
2021
ABSTRACT Three-dimensional preoperative planning has demonstrated multiple surgical advantages. Currently, we cannot carry out preoperative 3-dimensional planning of foot and ankle orthopedics in most hospitals due to the impossibility of performing weightbearing CT imaging. Our objective is to describe and evaluate an innovative accessible, simple, and effective device that simulates standing while in a supine position, to obtain 3-dimensional images supporting bodyweight load with a conventional CT machine. From a group of 30 volunteers, 10 patients were randomly selected and pressure and its distribution were analyzed while in a standing position in both feet. Differences between both fe…
Choice of the operative approach in two cardiosurgical patients assisted by preoperative computed tomography: Case Report
1988
The perioperative course of two patients is exemplified to demonstrate the significance of the preoperative thoracic computed tomography for the selection of a proper surgical approach.
Computed Tomography in Nonneoplastic Space-Occupying Intracranial Lesions
1981
A number of nonneoplastic intracranial space-occupying lesions may resemble neoplasms in the CT scan, and definitive diagnosis is not possible with CT studies alone in many cases. Misinterpretations are possible, even when all clinical data are considered in the interpretation of the CT scan. However, the most accurate possiblepreoperative diagnosis is a prerequisite for decisions on therapeutic strategy and surgical approach. Therefore some cases may require the full range of conventional neuroradiological techniques and careful consideration of clinical findings for correct interpretation of the CT scan with its consequences for therapy. Table 6 summarizes the most common alternatives in …
Plain film, CT and MRI sensibility in the evaluation of intraorbital foreign bodies in an in vitro model of the orbit and in pig eyes.
2000
Detection and characterization of intraorbital foreign bodies (IFB) is fundamental in acute trauma setting, preventing inflammatory sequelae or complications related to IFB movements when a MRI study is planned. Papers concerning plain film and CT sensibility in IFB detection show controversial results. For this reason we investigated plain film, CT and MRI sensibility in the evaluation of IFB. For an in vitro model, specimens of dry and fresh wood, glass, iron, plastic and graphite were immersed in animal lard and in a 0.9 % sodium chloride plus 3.5 g/dl human serum albumin solution. Specimens of different size and nature where also implanted into enucleated pig eyes. Air bubbles were intr…
Imaging of Ventriculoperitoneal Shunt Complications: Comparison of Whole Body Low-Dose Computed Tomography and Radiographic Shunt Series.
2016
OBJECTIVE To determine diagnostic value and radiation exposure of low-dose computed tomography (LD-CT) compared to radiographic shunt series (SS) for the detection of ventriculoperitoneal (VP) shunt complications. METHODS Fourteen VP shunts were implanted in 7 swine cadavers. Mechanical complications were induced in 50% of VP shunts. Low-dose CT (80 kVp, 10 mAs, Pitch = 1.5) and SS were acquired. Dose area product (DAP) and effective doses for SS and LD-CT were collected. Scoring of diagnostic confidence and blinded readings of SS and CT data were performed. RESULTS The sensitivity of LD-CT was high (0.97; 95% confidence interval, 0.91-1.00) with excellent interobserver agreement (κ = 0.88)…
Accuracy of automatic airway morphometry in computed tomography-correlation of radiological-pathological findings.
2010
Abstract Objectives Airway morphology shows characteristic changes in different pathologies. This study assesses the accuracy of a current automatic airway assessment technique by correlating CT images of porcine airways to histological slices of the same localization. Materials and methods Four isolated and ventilated porcine lungs were frozen in a liquid nitrogen bath and examined with a CT scanner (MDCT). This technique both preserved normal radiomorphological appearance and made it possible to slice the specimens for histological examination for subsequent correlation. The parameters wall thickness (WT), wall percentage (WP), and total diameter (TD) were assessed by computer-aided measu…
Organisation of care and initial management of severe head injury in Spain: Results of a national survey
2016
Abstract Objective The main objective of the study is to obtain knowledge about the organisation of care for severe head trauma as well as the initial management of these patients in Neurosurgical Departments in Spain. Material and method A 22-item questionnaire was designed and sent to 59 Neurosurgical Departments. The aim of the questionnaire was to collect data regarding the general profile of the patients with a severe head injury, the general characteristics of the hospitals, the initial care of these patients, the monitoring techniques used, and the measures used to control Intracranial pressure (ICP). Results Of the 59 Neurosurgical Departments identified, 29 (49.2%) completed the qu…
An approach to the electrical tomography aimed to the investigation of particular confined structures
2003
In this paper we present a practical approach to the electrical tomography when applied to materials having particular shapes (like the columns). Simple cylindrical shapes have been tested, and the general model has been selected as a set of elements having circular sections of some angle and thickness.
Ultrasound-guided spinal fracture repositioning
1998
The management of narrowing spinal fragments in the operative treatment of spinal fractures remains an open question, in particular when the procedure is performed by a posterior approach. This article describes the use of intraoperative ultrasonography during spinal surgery. From 1990 to 1997, 116 spinal fractures were treated operatively at our clinic. Stabilization of the spine was achieved with the AO fixateur interne and the AO USS, respectively (Synthes, D-79224, Umkirch, Germany). For 60 cases who had a fractured posterior vertebral surface dislocated into the spinal canal, we used intraoperative ultrasonography to monitor the repositioning of the narrowing fragments. The patients un…
Acute aortic dissection
2011
An acute aortic syndrome with simultaneous presence of a penetrating aortic ulcer, an intramural haematoma, a thoracic aortic dissection and an abdominal aortic aneurysm rupture has not previously been reported. Herein, we describe our experience with a patient treated by endovascular means with an 8-year follow-up.