Inspired by the cross-ratio proposed Clayton, we study a new risk ratio to describe relation between components of random vector (T1,T2). It is conditional hazard rate function T1 at t1, given that T2≥t2 and T2<t2. A nonparametric estimator its asymptotic distribution obtained using Bernstein smoothing for survival copula (T1,T2) derivatives. The finite sample performance studied via simulation...

Introduction This clinical report assesses the feasibility of 3-D ultrashort echo time enhanced T2* (UTE-T2*) mapping of cartilage in vivo and examines the sensitivity of UTE-T2* to early cartilage degeneration compared to arthroscopic grading as the standard. UTE-T2* mapping is sensitive to changes in short-T2 signal (T2 <10ms) and may provide improved sensitivity to subtle matrix alterations,...

Introduction: A number of CMR imaging approaches have been proposed for detecting myocardial edema accompanying acute myocardial infarctions (AMI). T1 [1] and T2 [2] maps, T2-prepared SSFP [3] and cine SSFP (bSSFP) [4,5] are potential alternatives to the most commonly employed T2-weighted STIR (T2-STIR) [6] imaging. However, the relative sensitivities of the various approaches in relation to th...