[maxwell_smart]

This article isn't great.

First, it illustrates an MRI story with a (mislabeled) picture of a CT scanner.

Then, it overestimates the volume of gas expelled by a factor of 1000.

170L X 750 = 90k L = 90m^3.

This would fill a 35m^2 (about 350 sq ft) room, maybe the size of a living room, with pure helium.

[Johnny555]

I came up with 125 m^3 here:

http://www.airproducts.com/Products/Gases/gas-facts/conversi...

But if you're going to criticize their math, you might want to double check your own math.

90 m^3 = 2m (height) x 6.7 m^2

(ok, 2m is a little low, 2.5m would be more comfortable.)

[maxwell_smart]

My math was fine, but I did get the base numbers wrong. Should have been 120L as mentioned in the article, which equates to 88.577 m^3 at 15C, which is pretty chilly. 20C is more like room temp.

But, I'm not sure your math is quite on the money either.