JCMR IF increased

The new JCMR Impact Factor has increased to a solid 4.33. In the last year it has steadily risen with 2010 showing a huge gain:
2006 1.74
2007 1.87
2008 2.15
2009 2.28
2010 4.33
Interestingly, self-reporting has been relatively low at 14% with a bit upward numbers to 26% to years used in IF calculation. Even without self cites, it would still post a significant increase to 3.2 this year.
How do we compare to other CV and Rad journals? The median values for CV and Rad are 1.99 and 1.87 respectively. Here is a selected list of journals in order of IF:
Radiology 6.1
JACC Imaging 5.5
Circ Imaging 4.8
Invest radiol 4.7
Eur Radiol 3.6
MRM 3.3
Int J Cardiovas Imag 2.5