Brief MRI Order for Cognitive Decline
Order: "MRI brain without contrast for dementia evaluation" 1
This simple order is sufficient—radiology will automatically include the appropriate sequences based on ACR Appropriateness Criteria for dementia imaging 1.
Why This Works
The 2025 ACR guidelines establish MRI head without IV contrast as the standard initial imaging for cognitive impairment 1. When you order an MRI for dementia evaluation, radiologists follow standardized protocols that inherently include:
- Volumetric T1-weighted sequences for hippocampal and cortical atrophy assessment 1
- FLAIR sequences for white matter lesions and vascular changes 1, 2
- T2-weighted imaging for structural abnormalities 2
- Diffusion-weighted imaging (DWI) to distinguish MCI from AD and detect acute infarcts 1, 3
Key Evidence Supporting This Approach
MRI without contrast has 80% accuracy for predicting conversion from MCI to AD based on hippocampal atrophy patterns 1. DWI specifically helps distinguish patients with cognitive impairment from healthy controls through apparent diffusion coefficient (ADC) values in limbic regions 1.
The diagnostic yield of DWI in cognitive impairment is 3.2% overall, detecting acute/subacute infarcts (2.5%), Creutzfeldt-Jakob disease (0.33%), and other critical diagnoses 3. This yield increases with age, reaching 8% in patients 90-99 years old 3.
What NOT to Add
- Do not specify "3T scanner" unless your facility requires this notation—most modern protocols default to the highest available field strength
- Do not list individual sequences—this makes you sound like you're dictating the protocol rather than ordering appropriately
- Avoid requesting "thin-slice volumetric"—this is implicit in modern dementia protocols 4
Common Pitfall
Ordering "MRI brain" without specifying the indication may result in a generic protocol. Always include "for dementia evaluation" or "for cognitive decline" to trigger the appropriate dementia-specific protocol that includes all necessary sequences 1.