Factors predicting the time-length variability of identically protocoled MRI exams

Area of Science:

• Medical Imaging
• Radiology
• Healthcare Operations

Background:

• Clinical variability in Magnetic Resonance Imaging (MRI) exam durations impacts efficient MRI utilization.
• Limited data exists on the variability of identically protocoled MRI studies and the influence of non-technical factors on exam length.

Purpose of the Study:

• To quantify the variation in MRI exam duration for identical protocols.
• To identify non-technical factors contributing to MRI exam time variations.

Main Methods:

• Retrospective analysis of 2705 MRI examinations (cervical spine, stroke, brain) without contrast.
• Evaluation of predictors: patient demographics, technologist, patient status, MRI field strength, sedation, day/time of study.
• Statistical analysis using linear regression and multivariate mixed models.

Main Results:

• Substantial variability observed, with standard deviations 19-29% of mean exam length.
• Performing technologist was the most significant factor (SD=2.645, P<0.001).
• Inpatient (4.18 min longer) and ED (1.86 min longer) exams took more time; male gender added 1.36 min (P<0.001).

Conclusions:

• Non-technical factors significantly influence MRI exam times.
• Variations are predictable using clinical and demographic data.
• Findings have implications for MRI scheduling, protocol design, staff training, and workflow optimization.