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.