Colour Doppler imaging in the demonstration of an orbital varix.

Abstract

Depending on the direction of flow with respect to the transducer, the flow is displayed in either red or blue. The colours can be arbitrarily assigned, but by convention, and in this study, flow towards the transducer is depicted as red and away from the transducer as blue. When the eye and orbit are examined through the eyelids, the ultrasound beam is almost parallel to the orbital and ocular vessels; thus most arterial flow is depicted in red. Arteries can usually be distinguished from veins by noting the pulsatility of the former. Pulsed Doppler spectral analysis also helps to distinguish between pulsatile arterial and non-pulsatile venous flow and allows quantification of data. When the ultrasound beam is at an angle of 90°t o a vascular structure, or ifa vessel contains only stagnant blood, no Doppler flow information is obtained and the structure is shown in grey scale display only.Our patient was a 38-year-old woman who had positional proptosis of the left eye and classic findings of an orbital varix on computed tomography.5 26 A contact gel (Aquasonics) was

Doppler-Sonographie bei Normaldruckglaukompatienten

“…Neben Perfusionsstudien bei Glaukom findet die Doppler-Sonographie in der Augenheilkunde Anwendung bei der Darstellung von intraokularen Tumoren [10,17], Carotis-sinus-cavernosusFisteln [7], orbitalen Varizen [18] und okularen Gefäßverschlüs-sen [19].…”

Twinkling Artifact in Color Doppler Imaging of the Orbit

“…Diagnosis of many orbital diseases such as retinal and choroidal detachment, orbital varices, arteriovenous malformations, and vessel thrombosis is facilitated by detection of color flow within the investigated tissue. [1][2][3][4][5][6] In this report, we describe an artifact related to color Doppler flow imaging of the orbit. The color flow might be mistakenly interpreted as real blood flow if an examiner is not familiar with the artifact.…”

“…[1][2][3][4][5][6][7] The blood flow is shown with this technique as a color map superimposed on a gray scale image of the examined structures. Diagnosis of many orbital diseases such as retinal and choroidal detachment, orbital varices, arteriovenous malformations, and vessel thrombosis is facilitated by detection of color flow within the investigated tissue.…”

An unusual case, Bilateral orbital varices

“…Different radiological methods can be used in the diagnosis of the orbital varix (Lieb et al 1990;Wildenhaim et al 1991). Magnetic resonance, the first performed radiological study in our patient, demonstrated bilateral retrobulbar masses.…”