Cross sectional Area: < 100 mm2 and < 10 mm AP defines spinal canal stenosis, judgement on degree (< 70 mm2 at L3 has been shown in cadaveric studies to cause increased pressure on CE roots)
Redundant Nerve Roots: Signifies critical lumbar spinal stenosis
Congenital Spinal Stenosis: Usually secondary to congenitally short pedicles (< 6.5 mm)

MRI TMJ TUTORIAL -Power Point Presentation
Lateral Recess Anatomy and Stenosis AJNR 2003
Carotid Stenosis CTA Technique AJNR 2004
Lumbar Puncture Technique AJR 2015

SGMF CTP 2019
CT Perfusion fundamentals before Call