Inflamed lymph node. Three-dimensional power Doppler ultrasound scan of blood vessels (orange) in an inflamed lymph node in the neck of a 13- year-old boy. The node contains a network of thin blood vessels (centre right). These drain into the thicker jugular vein at left. Inflammation of a lymph node (lymphadenitis) is usually a response to an infection. The increased lymph node activity produces more infection-fighting lymphocyte cells. Doppler ultrasound scanning detects moving fluids,such as blood,by the frequency change they cause when reflecting high-frequency sound waves. Power Doppler scans use colour to show the moving fluid,but do not show the direction of the flow | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Fraser, Simon |
Bildgröße: | 768 px × 576 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |