1,720,974 research outputs found
Accuracy of computed tomography and magnetic resonance imaging in staging bronchogenic carcinoma
No full textSixty-three patients with non-small cell bronchogenic carcinoma were prospectively and independently assessed by computed tomography (CT) and magnetic resonance imaging (MRI) before surgery. Images were interpreted by four radiologists who had no knowledge of other imaging studies, except chest x-ray, and were blinded to surgical findings. The data were compared with pathologic and histologic findings. The accuracies of CT and MRI in determining tumor classification and assessing mediastinal and hilar lymph node metastases were compared. Sensitivity of CT in determining T factor was 78%, and specificity was 96%. The values for MRI were 84% and 96%, respectively. There was no significant difference between CT and MRI in staging tumors. MRI is more accurate than CT in diagnosing mediastinal invasion in staging superior sulcus tumors and complex tumors. There was no significant difference between the accuracies of CT and MRI in detecting mediastinal node metastases; the sensitivities were 82% and 90%, respectively, and specificities were 88% and 93%, respectively
Radiation-induced obstruction of the right pulmonary artery. A case report
No full textNo abstract availabl
Automated scheduling of radiologic procedures
No full textThe dramatic advances in radiology have increased the number and type of machines and of daily performed exams. Consequently, workload and management organization problems have also markedly increased. Automated, computerized scheduling of radiologic exams is certainly a step forward in a modern rational management of a Diagnostic Imaging service: the relationship with the patient is improved with the optimization of care delivered and of the radiologist's work, who with the new technology is able to rapidly consult the previous exams as well as the list of exams to be performed. The advances in health care information technology imply communications at a distance. From each ward of the hospital, requests for radiologic exams can be automatically scheduled or kept on a dynamic waiting list for automated input in future work shifts. Via the same system, reports (and also radiologic images) can by rapidly transmitted to the wards. At the 'Universita Cattolica del S. Cuore' from several y..
Diagnostic imaging and therapy in a case of myasthenia gravis associated with thymic hyperplasia
No full textThe diagnostic approach to a patient with myasthenia gravis to verify the presence of thymic hyperplasia/thymoma is presented. The study of the mediastinal region was necessary. Mediastinal MRI showed the presence of a mass. The differential diagnosis between a mediastinal and an extramediastinal lesion is possible with MRI for its high contrast resolution, good spatial resolution and multiplanarity that allow the detection, localization, evaluation of the extent and/or infiltration of adjacent tissues/organs based on the analysis of adipose cleavages and typing in the different pulse sequences of pathologic tissue with contrast enhancement. Definitive diagnosis of thymic hyperplasia was established. Therefore surgery should be essentially associated with the severity of the clinical presentation rather than with thymic hyperplasia
New insights on COPD imaging via CT and MRI
No full textMultidetector-row computed tomography (MDCT) can be used to quantify morphological features and investigate structure/function relationship in COPD. This approach allows a phenotypical definition of COPD patients, and might improve our understanding of disease pathogenesis and suggest new therapeutical options. In recent years, magnetic resonance imaging (MRI) has also become potentially suitable for the assessment of ventilation, perfusion and respiratory mechanics. This review focuses on-the established clinical applications of CT, and novel CT and MRI techniques, which may prove valuable in evaluating the structural and functional damage in COP
Relationship Between Biotype and Bone Morphology in the Lower Anterior Mandible: An Observational Study
No full textBackground: Different clinical parameters have been advocated as potential predictors of alveolar and
basal jawbone morphology. The aim of this study is to describe, by tomographic means, alveolar and
basal osseous dimensions of the anterior mandible in healthy individuals and evaluate potential correlations
with biotype, along with other clinical parameters.
Methods: One hundred consecutive healthy patients needing surgery in the posterior mandible were
enrolled in this observational study (group 1 = 50 patients with thin biotype; group 2 = 50 patients
with thick biotype). Data were collected for: 1) Little irregularity index for anterior crowding; 2) molar
and canine class relationship; 3) previous orthodontic treatment; 4) gingival recession; and 5) band of
keratinized gingiva for each of the six anterior mandibular teeth (#22 through #27). At the most midbuccal
computerized tomography slice of each tooth, other parameters were measured, including: 1) distance
from the cemento-enamel junction to the bone crest; 2) tooth torque (TT); 3) labial cortical bone
thickness (BT) for alveolar and basal bone; and 4) BT 5 and 10 mm apical to the tooth apex. Data were
statistically analyzed, and significance was set at P £0.05.
Results: Mean thickness of alveolar bone ranged from 6.66 to 4.51 mm (standard deviation [SD] =
1.46 for tooth #27; SD = 1.01 for tooth #25) whereas mean thickness of basal bone ranged from 8.9
to 8.2 mm (SD = 2.06 for tooth #22; SD = 2.06 for tooth #26). Mean thickness of bone at 5 mm from
apex ranged from 11.94 to 10.47 mm (SD = 2.96 for tooth #25; SD = 2.22 for tooth #22), whereas
mean thickness of bone at 10 mm from apex ranged from 13.75 to 11.08 mm (SD = 2.79 for tooth
#25; SD = 2.53 for tooth #27). No statistically significant differences were detected among biotypes,
whereas: 1) TT, 2) age, and 3) smoking habit were often predictors of reduction in BT in a multiple linear
regression model. Male sex was often a predictor of positive changes in BT, and previous orthodontic
therapy was a protective factor against developing bone loss >5 mm.
Conclusions: Although some differences were detected among biotypes, data indicate that biotype
does not play a fundamental role in influencing alveolar BT, whereas other variables (i.e., TT, sex,
age, and smoking habit) do influence alveolar BT. Further studies are needed to better understand the
extent of influence of each clinical variable
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