3-D Rotation Dacryocystography
Lüchtenberg M.1, Berkefeld J.2
1Dept. of Ophthalmology, 2Dept. of Neuroradiology, Johann Wolfgang Goethe University, Frankfurt/Main
Purpose: Checking the applicability of 3-D rotation-angiography system for imaging of lesions of the lacrimal draining system.
Method: Five patients with stenosis of the lacrimal system were enrolled in this pilot project to performe a distension-dacryocystography as 3 D-rotation-angiography. The 3-D reconstructions are derived from 100 radiographic projection images, which are obtained during a 240° rotation of an angiographic c-arm. Volume rendering techniques show plastic representations of the contrast enhanced ductal system with the possibility of additional virtual dacryoendoscopy. The adjacent bony structures and the nasal cavity can be visualized as well by special window settings and cuts through the 3D-data set. Exact calibration of the X-ray system allows for precise measurements of distances. A sufficient 3-D representation needs a permanent injection of contrast material for about 5.5 sec. Outpatient examination under surface aesthesia is well tolerated.
Results: The high resolution 3-D reconstructions show detailed images of lesions of the endoluminal surface and give a plastic impression of the site of obstructions. In contrast to normal DSA-dacryocystography the contrast enhanced ductal system the adjacent bone and even the soft tissues of the nasal cavity are demonstrated simultaneously. A disadvantage is an incomplete representation of the res
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