Arning C
Neurologische Abteilung, Allgemeines Krankenhaus Barmbek, Hamburg.
Ultraschall Med. 1997 Jun;18(3):105-9. doi: 10.1055/s-2007-1000404.
The practical application of colour-coded duplex sonography shows that physico-technical artifacts of colour Doppler imaging may not be obvious in all cases and can lead to misinterpretation. Slice-thickness artifacts are due to restricted transversal resolution, as in the B-mode, and may cause false negative results in vascular occlusions. Specific problems in creating and processing the colour flow image interfere with lateral resolution and lead to errors in the quantification of stenoses from the colour Doppler image. Mirror image artifacts produce phantom pictures that can be easily identified as such in some cases, but may resemble recesses in the arterial wall in other cases. Phenomena of sound shadowing resulting from the same reasons as in B-mode may lead to assume vascular occlusions in cases of long-range stenoses. Artifacts of the sonication angle in case of blood vessel tortuosity may lead to misdiagnosis of a non-existent retrograde flow. The artifacts mentioned do restrict the capacity of colour coded duplex sonography for localising flow in the ultrasound image. Users of the method should therefore be familiar with these artifacts.
彩色编码双功超声的实际应用表明，彩色多普勒成像的物理技术伪像并非在所有情况下都很明显，可能会导致错误解读。切片厚度伪像与B模式一样，是由于横向分辨率受限所致，可能会在血管闭塞时导致假阴性结果。创建和处理彩色血流图像时的特定问题会干扰横向分辨率，并导致从彩色多普勒图像中对狭窄进行定量时出现误差。镜像伪像会产生幻影图像，在某些情况下很容易识别，但在其他情况下可能类似于动脉壁的凹陷。与B模式相同原因导致的声影现象可能会在长段狭窄的情况下导致误诊为血管闭塞。血管迂曲时超声入射角的伪像可能会导致对不存在的逆流进行误诊。上述伪像确实限制了彩色编码双功超声在超声图像中定位血流的能力。因此，该方法的使用者应熟悉这些伪像。
