Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revisionPrevious revision
Next revision		Previous revision
library:mri_brain [2025/03/04 15:21] – scottlibrary:mri_brain [2025/03/05 03:07] (current) – scott
Line 1: Line 1:
-=====Brain=====+=====Brain MRI=====
 ====Scan Coverage and Planning==== ====Scan Coverage and Planning====
 ===Sagittal Plane=== ===Sagittal Plane===
Line 15: Line 15:
 ===Dorsal Plane=== ===Dorsal Plane===
  
-On a mid sagittal image, plan slices parallel to the brainstem/cranial spinal cord. There is some anatomic and positional variation with these landmarks, so if neither seems like an appropriate angle, it is also acceptable to plan dorsal slices parallel with the hard palate. The coverage should include at a minimum the bullae to the top of the head. The bullae can be easily located on an axial image, approximately where the facial and vestibulocochlear nerves are visualized. these are marked with small X's onthe axial image to the right.+On a mid sagittal image, plan slices parallel to the brainstem/cranial spinal cord. There is some anatomic and positional variation with these landmarks, so if neither seems like an appropriate angle, it is also acceptable to plan dorsal slices parallel with the hard palate. The coverage should include at a minimum the bullae to the top of the head. The bullae can be easily located on an axial image, approximately where the facial and vestibulocochlear nerves are visualized. these are marked with small X's on the axial image to the right.
  
 {{:library:dorplansagbrain.png?600|}}  {{:library:dor_planax_brain.png?600|}} {{:library:dorplansagbrain.png?600|}}  {{:library:dor_planax_brain.png?600|}}
 +
 +===Typical Scan Protocol===
 +
 +The protocol below represents a full brain exam. There is variation depending on the clinical question and clinician preference. The **minimum** recommended sequences are in bold text. Note that some sequences such as the DWI have specific use cases and should be considered required if their indication is present, ie if an ischemic stroke is the clinical question, don't skip the DWI.
 +
 +**Sagittal T2**\\
 +**Axial T2**\\
 +**Axial T2***\\
 +**Axial T2 FLAIR**\\
 +Axial DWI\\
 +**Axial T1**\\
 +__Contrast__\\
 +Sagittal T1\\
 +**Axial T1**\\
 +Dorsal T1\\
 +
 +====Tips and Tricks====
 +
 +===Sequence Substitutions===
 +
 +With Brain MRI in particular, there are quite a few sequence variations that may be encountered or substituted. These different sequences may provide the same or similar image contrast, but have different SNR, be 3D vs 2D, or have additional special properties. As with all things in MRI, there are trade-offs and pros/cons with each sequence choice that will be noted below. The different sequences will be categorized by their image contrast. Please note that some sequences will be vendor or software level specific, so may not be available on every scanner.
 +
 +==T2* Contrast==
 +
 +{{:library:merge_profile.png?600|}} {{:library:swi_profile.png?600|}}{{:library:swi_artifact.png?600|}}
 +
 +==T1 Contrast==
 +
 +{{:library:t1_fse_profile.png?600|}}  {{:library:fspgrprofile.png?600|}}}}
 +
 +
 +