Chemical shift MR imaging in the lumbar vertebra: the effect of field strength, scanner vendors and flip angles in repeatability of signal intensity index measurement

• DOI: 10.1186/s12880-016-0167-3
• Publication Date: 2016-11-25T02:02:48Z
• Authors: Zebin Xiao; Jian Li; Chengqi Li; Yuyang Zhang; Dejun She; Dairong Cao
• Keywords: Repeatability; Flip angle; Vertebra; SIGNAL (programming language); Flip; Intensity

To evaluate the reproducibility of signal intensity index (SII) measurements with MRI systems from different vendors and field strengths, to test effectiveness flip angle. Thirty-two healthy volunteers (mean age 35.3 ± 9.3 years) were enrolled in this ethics committee-approved study. Chemical shift MR imaging was performed on 1.5- 3.0-T three vendors. Two independent observers measured SII values five lumbar segments. Inter- intraobserver agreement assessed using interclass correlation coefficients (ICCs). Differences mean between strengths as well angles compared by repeated-measures analysis variance. also paired-sample t test. intra-observer showed good (all ICC > 0.75) when measuring at (ICCs ranging 0.896 0.983) 0.824 0.983). There no significant differences p 0.05 0.337 0.824). The four statistically < 0.001 0.004) except group angle 50° versus 70° (p = 0.116). measurement chemical may be comparable systems. Also high better stability quantitate fat content.