Doctors should use a diffusion MRI scan to diagnose stroke instead of a CT scan, according to a new guideline from the American Academy of Neurology. “While CT scans are currently the standard test used to diagnose stroke, the Academy’s guideline found that MRI scans are better at detecting ischemic stroke damage compared to CT scans,” said lead author Peter Schellinger, MD, with the Johannes Wesling Clinical Centre in Minden, Germany.
A majority of strokes are ischemic, caused by lack of blood flow in the brain, usually due to a blockage or a blood clot. The window for treatment to reverse the damage from an ischemic stroke is measured in hours. The guideline states that diffusion MRI should be considered more useful than a CT scan for diagnosing acute ischemic stroke within 12 hours of a person’s first stroke symptom.
CT scans are a specialised kind of X-ray taken of the brain while MRI uses magnets and radio waves that show clearer images of brain tissue. Diffusion MRI also measures molecular water motion in the tissue, showing where water diffusion is restricted and therefore brain damage has occurred.
In addition, the guideline found MRI scans more accurately detected lesions from stroke and helped identify the severity of some types of stroke or diagnose other medical conditions with similar symptoms.
“Specific types of MRI scans can help reveal how severe some types of stroke are. These scans also may help find lesions early,” Schellinger said. “This is important because the research suggests finding lesions early may lead to better health outcomes.”
Schellinger also says studies have proven the importance of using MRI in emergency rooms but says doubts still exist surrounding the use of stroke MRI scans in clinical settings.
“This guideline gives doctors clear direction in using MRI first, ultimately helping people get an acute stroke diagnosis and treatment faster. However, one situation in which CT may still be used first is when a person needs an emergency injection of drug therapy (also known as intravenous thrombolytic therapy) to break up blood clots, if MRI is not immediately available, to avoid delays in starting this treatment.”
Stroke is the third leading cause of death and the leading cause of permanent disability in the United States.