Dutch translation: ringvormige hyperdensiteit / hyperdense ring
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07:25 Jul 8, 2002
English to Dutch translations [PRO] Medical / CT scan diagnose
English term or phrase:ring enhancement
Ernstig immunodeficiënte patiënten vertonen typisch multipele hypodense, welafgelijnde laesies op de CT hersenscans. Bij immunocompetente patiënten worden vaker
> ***ring enhancement*** of grote laesies met oedeem er omheen
In patients with an atherosclerotic plaque three different findings are observed post-contrast:
1. A signal enhancement of the vessel lumen due to the lowering of the T1 relaxation time.
2. Focal signal loss in the vessel wall confined to parts containing macrophages due to a decrease of the T2* relaxation time.
3. A narrow band of low signal intensity adjacent to the high signal of the lumen. This "ring phenomenon" has been observed as well by Schmitz et al.  in an animal model.
The nature of the "ring phenomenon" is still unclear. It could be a flow-related phenomenon or adhesion of iron-oxide particles to the vessel wall