Comparative Time Efficiency of CT and MRI Multimodal Imaging Protocols in Acute Ischemic Stroke Evaluation.

Objective: To assess the time efficiency of computed tomography (CT) and magnetic resonance imaging (MRI) multimodal scanning protocols in the assessment of acute ischemic stroke (AIS), with potential implications for craniocerebral emergency management.

Methods: A retrospective analysis was conducted to assess the imaging workflows of CT and MRI for the assessment of AIS. The total examination time, derived from DICOM source data, encompassed pre-scan waiting periods, sequence acquisition times, and image reconstruction durations. In addition, the influence of the experience of radiologic technologists on scanning efficiency was analyzed. The CT imaging protocols included noncontrast CT, CT angiography (CTA), and CT perfusion (CTP), whereas the MRI protocols comprised noncontrast MRI, diffusion-weighted imaging (DWI), magnetic resonance angiography (MRA), susceptibility-weighted imaging (SWI), and arterial spin labeling (ASL). Craniocerebral imaging characteristics were documented without additional measurements.

Results: CT multimodal scanning demonstrated a shorter acquisition time, while MRI was associated with a reduced reconstruction duration. The total waiting period for CT (11.76 min) and scanning time (11.65 min) were slightly lower compared with MRI. However, MRI had a significantly shorter reconstruction time (7.09 min) compared with CT (13.42 min), resulting in a longer overall radiology department time for CT (36.83 min) than for MRI (31.00 min). Notably, during the night shift, the waiting period for MRI (12.1 min) was shorter than during the day shift (15.4 min). In addition, the experience of radiologic technologists had a significant impact on procedural efficiency.

Conclusions: MRI demonstrates greater efficiency in AIS evaluation during night shifts in municipal hospitals, leveraging its superior diagnostic capabilities and optimized time efficiency. Conversely, CT is better suited for rapid initial assessments during day shifts, particularly in high-risk scenarios. Aligning imaging protocols with the expertise of radiologic technologists and shift schedules can further enhance the efficiency and effectiveness of stroke management. These findings may inform protocol optimization in craniocerebral emergency settings.