What imaging modality is most commonly used for stroke diagnosis?

The most commonly used imaging modality for stroke diagnosis is Computed Tomography (CT) scan of the head. This preference is due to several factors. First, CT scans are widely available in emergency settings and can be performed quickly. Rapid diagnosis is crucial in stroke management, particularly for determining the type of stroke—whether ischemic or hemorrhagic.

CT scans are especially effective in the initial assessment because they can quickly reveal evidence of a hemorrhagic stroke, such as bleeding in the brain. While MRIs provide more detailed images and can later be used to assess specific characteristics and the extent of brain damage, they typically take longer, are less accessible in some settings, and are not as readily used in acute situations where swift decision-making is critical.

Other imaging modalities, such as X-rays of the neck and ultrasound of the neck, do not provide the necessary visualization of brain structures to diagnose a stroke directly, as they focus on different anatomical areas and conditions. Thus, the CT scan stands out due to its speed, availability, and effectiveness in the acute stroke setting.