Magnetic resonance imaging in acute head injury

Area of Science:

• Neurology
• Radiology
• Medical Imaging

Background:

• Acute head injuries require prompt and accurate diagnosis.
• Computed tomography (CT) is a standard imaging modality, but may miss subtle lesions.
• Low-field magnetic resonance imaging (MRI) systems offer potential advantages in specific clinical settings.

Purpose of the Study:

• To evaluate the feasibility and safety of low-field (0.15 T) MRI for acute head injury assessment.
• To compare the diagnostic sensitivity of MRI versus CT in detecting abnormalities after head trauma.
• To investigate the specific types of lesions visualized by MRI that may be missed by CT.

Main Methods:

• Cardiorespiratory monitoring and compatible support equipment were used with a 0.15 T MRI system.
• Fifty patients with acute head injuries were examined within 7 days of injury.
• T2-weighted and T1-weighted multislice MRI sequences were employed, with results compared to CT findings.

Main Results:

• MRI was feasible and safe in patients with acute head injuries.
• MRI detected abnormalities in 46 of 50 patients, compared to 31 of 50 patients with CT.
• MRI provided superior visualization of intracranial extracerebral blood collections, particularly in the posterior fossa, subtemporal, and subfrontal regions.
• MRI demonstrated greater sensitivity to cerebral abnormalities associated with traumatic unconsciousness, including non-hemorrhagic contusions and shearing injuries, which were not always apparent on CT.

Conclusions:

• Low-field MRI is a safe and effective alternative to CT for evaluating acute head injuries.
• MRI offers enhanced sensitivity in detecting a wider range of traumatic brain lesions, including subtle parenchymal abnormalities.
• The detailed information provided by MRI can improve the understanding of early and late consequences of head trauma.