Have a look at this publication of Sein et al., 'Reliability of MRI assessment of supraspinatus tendinopathy.' (PMID 17289860PMID 17289860)
Sein ML et al. Reliability of MRI assessment of supraspinatus tendinopathy. Br J Sports Med. 2007 Aug;41(8):e9. Epub 2007 Feb 8. https://dx.doi.org/10.1136%2Fbjsm.2006.034421