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| | | | | | | | | | Flow Artifact | | | Quick Overview Please note that there are different common names for this artifact.
REASON
Movement of body fluids
Flow effects in MRI produce a range of artifacts, e.g. intravascular signal void by time of flight effects; turbulent dephasing and first echo dephasing, caused by flowing blood.
Through movement of the hydrogen nuclei (e.g. blood flow), there is a location change between the time these nuclei experience a radio frequency pulse and the time the emitted signal is received (because the repetition time is asynchronous with the pulsatile flow).
The blood flow occasionally produces intravascular high signal intensities due to flow related enhancement, even echo rephasing and diastolic pseudogating. The pulsatile laminar flow within vessels often produces a complex multilayered band that usually propagates outside the head in the phase encoded direction. Blood flow artifacts should be considered as a special subgroup of motion artifacts.
Image Guidance
| | | • View the DATABASE results for 'Flow Artifact' (6).
| | | | Further Reading: | News & More:
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| | | Case Study 1 :
| | Flow artifacts from both iliac vessels, seeing as a band of bright points in anterior to posterior direction (phase encoding). |
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| | | Case Study 2 :
| | Flow artifacts from both femoral vessels, seeing as a shadowed band in anterior to posterior direction (phase encoding). |
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| | | Case Study 3 :
| | Flow artifact in right to left direction (phase encoding) from the popliteal vessel, seen as a small bright artifact along the middle of the femoral bone. |
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