Box plot showing the total brain volume across vendors according to echo time percentage discrepancy from the CDIP criteria (GE 1%: 2.87–2.93 ms, 5% 2.75–3.05 ms, 10%: 2.61–3.19 ms; Philips 1%: 2.75–3.33 ms, 5% 2.83–3.47 ms, 10%: 2.97–3.63 ms; Siemens 1%: 2.95–3.01 ms, 5% 2.83–3.13 ms, 10%: 2.68–3.28 ms). Boxes show the first and third quartiles with the line denoting the median. Whiskers represent the lowest/highest datum still within 1.5 interquartile range (IQR) of the lower/higher quartile.