J Varandas | PubMed Health

PubMed2004

VOLUS--a visualization system for 3D ultrasound data.

The main goal of this paper is the description of a computer based system for medical applications to estimate the half-ellipsoid model that fits the left ventricle on its two phases of cardiac cycle: diastole and systole. Techniques for registration and rendering of ultrasound images will be presented using 2D freehand spatial calibrated echocardiography images in order to represent the 3D reconstructed data equivalent to the scanned volume. The 3D reconstruction will be used to estimate and measure parameters of the half-ellipsoid model fitted to the left ventricle.

Echocardiography, Three-Dimensional↗

PubMed1997

Contact endoscopy of the nasal mucosa.

The possibility of contact endoscopy in the nasal mucosa, using a contact microlaryngoscope is examined. With contact endoscopy it has been possible to visualize in vivo and in situ (60x, 150x) the superficial cell layers of the nasal epithelium, previously stained with methylene blue. Normal mucosa and cases with pathology (chronic rhinitis, nasal polyposis, inverted papilloma, mucormicosis and carcinoma) were assessed with contact endoscopy (50 patients). Squamous epithelium, ciliated epithelium, glandular ostia, mucus secretions, microvascular networks, inflammatory cell infiltrates, tissue inclusions, nuclear abnormalities, and fungal hyphae have been made visible. The potential of contact endoscopy in the nose, the alterations required in the contact endoscope and the intense interdisciplinary work needed are discussed. Evaluation and differentiation of stages of chronic mucosal diseases, nasal polyposis, environmental pathology, allergy, mucocilliary diseases, pharmacotherapy, are some of the entities that will benefit from this technique.

Adolescent↗