正常股骨中下段骨髓生理性转化的MRI表现  

MRI features of normal middle and distal femoral bone marrow conversion

作　　者：高振华[1] 马玲[1] 张朝晖[1] 孟悛非[1] 

机构地区：[1]中山大学附属第一医院医学影像科,广东广州510080

出　　处：《中国医学影像技术》2011年第2期380-383,共4页Chinese Journal of Medical Imaging Technology

摘　　要：目的分析不同年龄组正常股骨中下段骨髓MRI信号随年龄增长的变化特点。方法 90名2~30岁股骨正常的受检者按照不同年龄分为6组,均接受MR检查。观察T1WI股骨干中段（MD）、股骨干下段（DD）及远侧干骺端（DM）的骨髓信号强度,并将其分为0~4级;其中0~2级定为红骨髓优势图像,3~4级定为黄骨髓优势图像,并结合脂肪抑制T2WI,观察骨髓信号的均匀性。结果 A组（2~5岁）股骨三个部位骨髓信号强度为0~2级;B组（6~10岁）中分别有5名和6名受检者出现MD和DD骨髓信号强度3级,DM骨髓信号强度仍表现为0~2级。C组（11~15岁）、D组（16~20岁）、E组（21~25岁）及F组（26~30岁）中除2名受检者MD骨髓信号强度表现为2级外,其余受检者MD及DD骨髓信号强度均为3~4级。C组受检者中DM骨髓信号多为2级（12/15）;D组中DM骨髓信号多为3~4级（12/15）;E组及F组中除1名受检者DM骨髓信号为2级外,其余均为3~4级。结论股骨骨髓MRI信号随年龄增长而发生变化,MRI可反映骨髓的正常生理性转化。Objective To analyze the age-related changes of signal intensity on MRI in normal middle and distal femoral bone marrow.Methods Ninety normal volunteers or patients without bone marrow disease aged 2 to 30 years were collected and divided into six groups according to their age.All the subjects underwent MR examination with a 1.5T MR system after informed consent.The signal intensity on T1WI of femoral bone marrow in different sites including middle diaphysis（MD）,distal diaphysis（DD）,distal metaphysis（DM） were observed and grouped into 5 grades comparing with the signal intensity of adjacent muscle and subcutaneous fat.The marrow signal intensity of grades 0—2 were considered to represent red marrow while that of grade 3 or 4 were considered to represent yellow marrow.Moreover,the signal uniformity was observed with the combination of T1WI and fat-suppressed T2WI.Results The signal intensity of bone marrow in MD,DD,and DM was grades 0—2 in group A（2—5 years old）.The increased signal intensity（grade 3） of MD and DD was found in group B（6—10 years old）,while the signal intensity of DM remained grades 0—2.The signal intensity of MD and DD manifested as grades 3—4 in the majority of group C—F（11—30 years old） and the signal intensity of grade 2 was found in 2 subjects.The signal intensity of DM showed grade 2 in 12/15 of group C（11—15 years old）,grades 3—4 in 12/15 of group D（16—20 years old） and grades 3—4 in 29/30 of group E（21—25 years old） and F（26—30 years old）.Conclusion MRI signal intensity of femoral bone marrow changes with aging.Normal bone marrow conversion could be reflected by MR images.

关 键 词：股骨 骨髓 磁共振成像 

分 类 号：R826.68[医药卫生—临床医学]