Results 1 - 10 of 37
Results 1 - 10 of 37. Search took: 0.016 seconds
|Sort by: date | relevance|
[en] This paper presents a radiologic evaluation of defecation disorders. Twenty-five patients with symptoms of defecation disorders who presented clinically the findings of dysplasia of the external anal sphincter were examined with endorectal US, defecography, and CT. The findings were compared with those of 15 patients who were given a radiologic examination of the pelvis for other reasons. All patients of the first group underwent surgery. The radiological findings are as follows: defecography: a short anal canal (below 1 cm) and a dorsal anocele; CT: a failure of attachment of the external and sphincter to the coccyx; Endorectal US and CT: absence of posterior parts of the external anal sphincter. None of these findings were demonstrated in the comparison group. All patients of the first group underwent surgery and were proved intraoperatively to have dysplasia of the external anal sphincter, which was corrected subsequently. The authors' results show that at least two kinds of external and anal sphincter dysplasia exist. The results of the radiologic examinations correspond with the intraoperative findings. The authors believe that in chronic constipation in children or adults the radiologic examinations mentioned above should be done because surgical correction of anal sphincter dysplasia leads to an immediate improvement of defecation disorders
[en] The aim of this study was to find a model able to extract the net time per unit of net worked area from different agricultural field basic shapes (square, circle, rectangle and triangle) considering the following variables: field gross area, working speed, number of turnings (these depending on the effective working width), side length parallel and orthogonal to working direction, and working direction type. Being this a non-linear problem, an approach based on artificial neural networks is proposed. The model was trained using an artificial dataset calculated for the various shapes (internal test) and then tested on 47 different agricultural operations extracted by a real field dataset for the estimation of the net time (external test). The net time records obtained from both, the trained model and the external test, were correlated and the performance parameter r was extracted. Both regression coefficients (r), for the training and internal test, appear to be excellent being equal to 0.98 with respect to traditional linear approach (0.13). The variable “number of turnings” scored the highest impact, with a value equal to 44.34% for the net time estimation. Finally, the r correlation parameter for the external test resulted to be very high (0.80). This information is very valuable of the use of information management system for precision agriculture.
[en] We studied how a holder used to suspend the mirrors of a gravitational wave interferometer, can influence the mechanical behavior and consequently modify the mirror thermal noise contribution to the detector sensitivity curve. The results are important to optimize the design for the PR mirror in the Virgo gravitational wave interferometer
[en] Hepatosplenomegaly is seldom caused by cystic tumefactions. 4 cases are presented, in which pseudocysts of the pancreas invaded and enlarged the spleen or liver. (orig.)
[de]Zystische Raumforderungen sind seltene Ursachen einer Hepatosplenomegalie. Wir stellen 4 Faelle vor, bei denen sich Pankreaspseudozysten in Milz und Leber ausdehnten. (orig.)
[en] 73 patients with 78 fractures of the temporal bone were examined by high-resolution computed tomography (CT). Analysis of the CT-findings disclosed 55 longitudinal, 12 transverse, 8 combined and 3 atypical fractures. For determination of the fracture type, axial sections usually proved sufficient. However, for precise topographic analysis of the course of the fracture additional coronal sections were necessary in most of the cases. In the radiologic evaluation of temporal bone fractures detection of associated. Complications is clinically important since these can be surgically corrected. In this series 20 lesions of the ossicular chain were demonstrated by the combined performance of axial and coronal sections and sagittal reformations. Highresolution CT demonstrated a lesion of the facial nerve canal in 79% of a patient group with traumatic facial nerve palsy. The most frequent site of injury of the facial nerve canal was the region of the geniculate ganglion. With the use of metrizaminde-CT-cisternography the site of cerebrospinal fluid leakage was demonstrated in 7 of 9 patients with liquorrhea. It is concluded that high-resolution CT is the radiologic method of choice for both topographic evaluation of temporal bone fractures and detection and precise localization of fracture-complications. (orig.)
[de]73 Patienten mit 78 Frakturen des Felsenbeines wurden mit der hochaufloesenden Computertomographie (CT) untersucht. Es wurden 55 Laengs-, 12 Quer-, 8 Kombinations- und 3 atypisch verlaufende Frakturen dargestellt. Zur Bestimmung des Frakturtyps genuegten in der Regel axiale Schichten, waehrend fuer die genaue topographische Analyse des Frakturverlaufes oft zusaetzliche coronare Schichten nuetzlich waren. Besonders wichtig ist die Darstellung von Frakturkomplikationen, da diese otochirurgisch angegangen werden koennen. Mit Hilfe von axialen, coronaren und gegebenenfalls sagital-rekonstruierten Schnitten konnten 20 Laesionen der Gehoerknoechelchenkette dargestellt werden. Ferner wurde bei 79% der Patienten mit traumatischer Facialisparese die Laesionsstelle des Facialiskanals nachgewiesen. Als haeufigste Laesionsstelle des Facialiskanals erwies sich die Gegend des Ganglion geniculi. Bei 7 von 9 Patienten mit Liquorrhoe konnte mittels Amipaque-CT-Zisternographie die Leckagestelle lokalisiert werden. Es wird gefolgert, dass die hochaufloesende CT die radiologische Methode der Wahl zur Darstellung von Felsenbeinfrakturen sowie zur Erfassung und Lokalisation von Frakturkomplikationen darstellt. (orig.)
[en] The estimation of operating costs of agricultural and forestry machineries is a key factor in both planning agricultural policies and farm management. Few works have tried to estimate operating costs and the produced models are normally based on deterministic approaches. Conversely, in the statistical model randomness is present and variable states are not described by unique values, but rather by probability distributions. In this study, for the first time, a multivariate statistical model based on Partial Least Squares (PLS) was adopted to predict the fuel consumption and costs of six agricultural operations such as: ploughing, harrowing, fertilization, sowing, weed control and shredding. The prediction was conducted on two steps: first of all few initial selected parameters (time per surface-area unit, maximum engine power, purchase price of the tractor and purchase price of the operating machinery) were used to estimate the fuel consumption; then the predicted fuel consumption together with the initial parameters were used to estimate the operational costs. Since the obtained models were based on an input dataset very heterogeneous, these resulted to be extremely efficient and so generalizable and robust. In details the results show prediction values in the test with r always ≥ 0.91. Thus, the approach may results extremely useful for both farmers (in terms of economic advantages) and at institutional level (representing an innovative and efficient tool for planning future Rural Development Programmes and the Common Agricultural Policy). In light of these advantages the proposed approach may as well be implemented on a web platform and made available to all the stakeholders.
[en] A total of 84 patients with 89 fractures of the temporal bone were examined with high resolution CT (HRCT) a few hours to 21 months after the initial trauma. Axial HRCT disclosed 63 longitudinal, 13 transverse, 10 complex and 3 atypical fractures. The diagnosis of a temporal bone fracture was established by axial HRCT in almost every case. However, for the precise topographic analysis of the course of the fracture, additional coronal HRCT proved helpful. The most common, surgically treatable complication of temporal bone fracture is disruption of the ossicular chain. Twenty-three such lesions were demonstrated by combined axial and coronal HRCT; 22 lesions of the facial canal could be demonstrated in 27 patients presenting with facial nerve palsy. The most common site of injury to the facial canal was the region of the geniculate ganglion. The only life-threatening complication of a temporal fracture may be otorhinoliquorrhea. This was present in 9 cases. The most common site of leakage identified was the tegmen tympani. With Metrizamide-HRCT precise localisation of the dural laceration was possible in 7 of these 9 cases. (orig.)
[en] We describe three cases of idiopathic thrombosis of the superior mesenteric and portal veins, in one case with additional thrombosis of the splenic vein. All patients suffered from unspecific, slowly increasing pain. The cause of the same could be detected only via CT. After anticoagulation the patients became symptom-free. A follow-up CT showed recanalisation of the affected veins. (orig.)
[de]Es werden drei Faelle einer idiopathischen Mesenterialvenenthrombose mit Ausbreitung in die Pfortader und in einem Fall zusaetzlich noch in die V.lienalis beschrieben. Alle drei Patienten litten unter unbestimmten, langsam progredienten Abdominalschmerzen, deren Ursache nur durch die CT festgestellt werden konnte. Unter Antikoagulation verschwanden die Beschwerden, und es kam zu einer Rekanalisation der Venen. (orig.)
[en] In the hierarchical search for periodic sources of gravitational waves, the candidate selection, in the incoherent step, can be performed with Hough transform procedures. In this paper we analyze the problem of sensitivity loss due to discretization of the parameters space versus computing cost, comparing the properties of the sky Hough procedure with those of a new frequency Hough, which is based on a transformation from the time-observed frequency plane to the source frequency-spin down plane. Results on simulated peakmaps suggest various advantages in favor of the use of the frequency Hough. The ones which prove to really make the difference are (1) the possibility of enhancing the frequency resolution without relevantly affecting the computing cost. This reduces the digitization effects; (2) the excess of candidates due to local disturbances in some places of the sky map. They do not affect the new analysis because each map is constructed for only one position in the sky