Abstract #1954

Age Dependence of Signal Intensity Ratio of In-Phase and Opposed Phase Image in Normal Spinal Bone

Eito Kozawa¹, Naoko Nishi², Youichi Sato², Shinichi Watanabe³, Junji Tanaka²

¹Radiology, Saitama Medical University, Hidaka, Saitama, Japan; ²Radiology, Saitama Medical University, Japan; ³Central Radiology, Saitama Medical University, Japan

We examined 65 normal subjects with 1.5-T MR imaging units on TE of 2.3, and 4.6 msec of dual chemical shift sequence. We divided our subjects into two groups, those younger than 50 years old and those older than 50 years, and we compared the signal intensity ratio (SIR) in the two group. The mean SIRs of the groups were significantly different according to unpaired-test (P < 0.001). Furhermore, in the course of aging, there is a systematic increase in measured of SIR of about 6% per decade of age. In conclusion, the SIR values of normal bone marrow could be strongly influenced by age.