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Poiseuille’s law for resistance
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Resistance to laminar flow of an incompressible fluid in a tube. This formula is provided solely for hypothetical demonstration only.

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Contrast Media Viscosity (cP) @ 37°C
Isovue 370 9.4  
Omnipaque 350 10.4  
Optiray 350 9.0  
Vispaque 320 11.8  

This is what you may feel with your hand using syring injection.

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SoftNAV, 4F
Resistance = 8 x Viscosity x Length ÷ 3.14 x Radius4
  = 8 x   x   ÷ 3.14 x  
  gram(s)/centimeter/second
  1 centipoise = 0.01 gram/centimeter/second
Competitor, 4F
Resistance = 8 x Viscosity x Length ÷ 3.14 x Radius4
  = 8 x   x   ÷ 3.14 x  
  gram(s)/centimeter/second
  1 centipoise = 0.01 gram/centimeter/second
SoftNAV, 5F
Resistance = 8 x Viscosity x Length ÷ 3.14 x Radius4
  = 8 x   x   ÷ 3.14 x  
  gram(s)/centimeter/second
  1 centipoise = 0.01 gram/centimeter/second
Competitor, 5F
Resistance = 8 x Viscosity x Length ÷ 3.14 x Radius4
  = 8 x   x   ÷ 3.14 x  
  gram(s)/centimeter/second
  1 centipoise = 0.01 gram/centimeter/second
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