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Biomedical subjects

M Coulomb

Publications and source records attributed to M Coulomb.

At least 127 records · Page 7Linked to original sources
PubMedDate not supplied

Tracheobronchial tree: three-dimensional spiral CT with bronchoscopic perspective.

The purpose of this report is to describe an original 3D technique that permits bronchoscopic perspective simulations of the tracheobronchial tree on an affordable workstation. Software based on surface shading was developed to permit navigation through the central airways using spiral CT data. Multiplanar reformations are displayed simultaneously with the virtual bronchoscopy simulations to give information about tissues surrounding the airways. Two clinical examples are reported to illustrate the value of this advanced computer technique.

Bronchography↗
PubMedDate not supplied

Localized benign fibrous tumors of the pleura: MR appearance.

PURPOSE: Our goal is to describe the MR findings in benign localized fibrous tumors of the pleura. METHOD: Chest radiographs, CT scans, and MR images of four patients with localized benign fibrous tumors of the pleura were retrospectively reviewed and correlated with the pathologic findings. RESULTS: Tumors ranged from 4 to 18 cm in their largest diameter. Three tumors were located in the diaphragmatic region, and one was within the left major fissure. All tumors were round to ovoid, pedunculated, and well delineated. On T1-weighted SE MR images, tumors showed low signal intensity. All tumors had heterogeneous but predominantly low signal intensity on proton-density-weighted images and lower signal intensity on T2-weighted images. CONCLUSION: Localized benign fibrous tumors of the pleura were characterized by low signal intensity on all MR sequences that is explained by high collagen content within the tumors' stroma and should suggest the diagnosis preoperatively.

Adult↗
PubMedDate not supplied

Helical CT with multiplanar and three-dimensional reconstruction of nonneoplastic abnormalities of the trachea.

Helical CT is being increasingly used for the evaluation of suspected tracheal diseases. Although nonneoplastic and noninfectious diseases of the trachea are rare, their appearance on CT images may be highly suggestive of the diagnosis. High quality multiplanar and 3D reconstructions including 3D surface-shaded display and virtual bronchoscopy are helpful to characterize tracheal abnormalities and to demonstrate the location and extent of the diseases.

Adult↗
PubMedDate not supplied

[Mediastinal lymph node extension in primary bronchial cancer: correlation of x-ray computed tomography, magnetic resonance imaging and mediastinoscopy. Apropos of 50 cases].

Based on a homogeneous series of 50 cases investigated within less than a week by CT scan and NMR imaging with mediastinoscopic correlation, and in 32 of theses cases with correlation with operative findings, a critical study was carried out of modern imaging methods for detection of mediastinal gland invasion from primary bronchial cancer. Axial mediastinoscopy presented absolute specificity and very high sensitivity (93%) markedly superior to those of CT scan and NMR imaging. The two latter examinations were practically of equal efficacy: sensitivity of NMR (80%) was somewhat higher than that of CT scan (70%) whereas specificity of CT scan was 83% as against 70% for NMR. Lack of efficacy of axial mediastinoscopy was in cases with extra-axial lymphatic extension (anterior mediastinal chains) from primary cancer. These results suggest that, in view of current inconveniences of NMR imaging, the best means for local and regional exploration of primary bronchial cancer preoperatively is combined CT scan and mediastinoscopy. The diagnosis of glandular enlargement of anterior mediastinal lymphatic chains should lead to performance of an anterolateral mediastinoscopy.

Aged↗
PubMedDate not supplied

[Magnetic resonance imaging with cardiac synchronization in chronic thrombosis of the main pulmonary arteries. Apropos of a case with computed x-ray tomographic correlation].

Results of nuclear magnetic resonance exploration in a patient with chronic thrombosis of main pulmonary arteries are used to outline an elementary semiology in agreement with current documented data. Signs observed relate to the thrombosis and showing of flow due to associated pulmonary artery hypertension. Cardiac synchronization is essential: obtaining 2 echos by the spin-echo technique allows differentiation of circulatory slowing phenomena, which provoke increased strength of 2nd echo, from the thrombus itself. Correlations established with V/Q scintigraphy, angiography and CT scan findings in this case provided preliminary evaluation of use of this imaging technique in this affection.

Angiography↗