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*Radsource is another good resource.
*Radsource is another good resource.
*http://radiologyassistant.nl/
*http://radiologyassistant.nl/
=CT=
* Houndsfield units of -1000 = air, +1000 = bone
=MRI=
=MRI=
* Nomenclature: use "intensity".
* Nomenclature: use "intensity".
* CSF is the easiest way to distinguish between T1 and T2. It is black in T1 and white in T2. Remember that 1 precedes 2 numerically in the same way that black naturally "precedes" white linguisticly (i.e. no one says "white and black" when referring to gray scale images)
* Good overview article of [https://pn.bmj.com/content/practneurol/6/5/318.full.pdf MRI principles].
* Nasal turbinates bright = MRI w/ contrast (per NSICU attending Vagnerova)
==Sequences==
==Sequences==
*T1: pancreas (due to Mn2+ deposition in the pancreas), fat, protein, hemorrhage, melanin, and gadolinium.
*T1: pancreas (due to Mn2+ deposition in the pancreas), fat, protein, hemorrhage, melanin, and gadolinium.
*DWI: bright areas are suspicious for infarcts, but can also be T2 shine-through. [[Dating Infarcts|Dating the chronicity of infarcts]] can be done with T1 and T2.
*DWI: bright areas are suspicious for infarcts, but can also be T2 shine-through. [[Dating Infarcts|Dating the chronicity of infarcts]] can be done with T1 and T2.
*ADC: dark areas on ADC are infarcts, and should correlate with bright areas on DWI.
*ADC: dark areas on ADC are infarcts, and should correlate with bright areas on DWI.
*In phase/Out of phase: iron deposits, steatosis.
*GRE: In phase/Out of phase. Most sensitive for assessing iron deposits, steatosis.
*T2-star:
*T2-star:
*FLAIR: heavily T2-weighted image which suppresses CSF
*FLAIR: heavily T2-weighted image which suppresses CSF