In order to observe the feature of age-related marrow conversion and maturation of epiphyseal cartilage and analyze the distribution of red and yellow marrow in the proximal femur at STIR MR imaging, STIR and T1 weigh...In order to observe the feature of age-related marrow conversion and maturation of epiphyseal cartilage and analyze the distribution of red and yellow marrow in the proximal femur at STIR MR imaging, STIR and T1 weighted MR imaging of the proximal femur in 52 subjects, aged 4 months to 25 years old, were retrospectively analyzed for the distribution and appearance of red and yellow marrow. The subjects with no known bone marrow abnormalities were divided into 6 age groups. The signal intensity of the marrow in the proximal epiphysis, proximal metaphysis, proximal diaphysis, distal diaphysis and greater trochanter was compared with the signal intensity and homogeneity of surrounding muscle and fat and graded by two observers. The results showed that the conversion of hematopoietic marrow in the proximal femur followed a well-defined sequence, occurring first in the proximal epiphysis, followed by the distal diaphysis, and then greater trochanter and metaphysis. STIR in combination with T1-weighted imaging could display clearly the origin of ossification center and the course of conversion from red to yellow marrow in proximal epiphysis and greater trochanter. STIR imaging showed that the marrow conversion in proximal metaphysic began below epiphyseal plate and intertrochanter. The site of red yellow was distributed in weight-bearing axis by 20 years of age. The marrow conversion of diaphysis was from distal end to proximal end, and the consequence of conversion was that distal diaphysis contained yellow marrow but proximal diaphysis partly red marrow connected with the red marrow of metaphysic. The epiphyseal cartilage had different characters of signal-intensity with age in STIR sequence. The distribution of red marrow in STIR imaging was more close to that of anatomy than T1-weighted imaging. It was concluded that STIR could dynamically display the feature of morrow conversion and the development of epiphyseal cartilage and accurately reveal the age-related distribution of red and yellow marrow on STIR imaging in the proximal femur.展开更多
Purpose: Bone marrow and muscle adiposity have been considered to correlate with osteoporosis and Sarcopenia. Proton Density Fat Fraction (PDFF) can be measured by Magnetic Resonance Imaging (MRI). The purpose of the ...Purpose: Bone marrow and muscle adiposity have been considered to correlate with osteoporosis and Sarcopenia. Proton Density Fat Fraction (PDFF) can be measured by Magnetic Resonance Imaging (MRI). The purpose of the present study was to measure PDFF in the lumbar spine, paraspinal muscle and subcutaneous fat tissue. Methods: Participants were comprised of 30 patients (18 males, 12 females;age range, 14 - 87 years) who underwent MRI due to low back symptoms. PDFFs for the body of the fourth lumbar vertebra (L4), paraspinal muscle, and subcutaneous fat were measured. Results: PDFFs of the vertebral body and subcutaneous fat were significantly higher than that of paraspinal muscle (p < 0.001). PDFF was significantly higher for subcutaneous fat than for the vertebral body (p < 0.001). Although no significant differences in PDFF of the vertebral body, paraspinal muscle, and subcutaneous fat between females and males, PDFFs of the vertebral body and paraspinal muscle were significantly higher in older subjects (>63 years) than in younger subjects (Conclusions: PDFF of the vertebral body was significantly higher than that of paraspinal muscle. PDFFs of the vertebral body and paraspinal muscle were significantly lower in younger subjects than in older subjects.展开更多
目的探讨腰肌指数(psoas muscle index,PMI)、腰椎椎体骨髓脂肪分数(fat fraction,FF)与骨密度(bone mineral density,BMD)间的关系及对骨质疏松(osteoporosis,OP)的诊断效能。方法选取四川省骨科医院2018年3月至2021年5月BMD筛查的200...目的探讨腰肌指数(psoas muscle index,PMI)、腰椎椎体骨髓脂肪分数(fat fraction,FF)与骨密度(bone mineral density,BMD)间的关系及对骨质疏松(osteoporosis,OP)的诊断效能。方法选取四川省骨科医院2018年3月至2021年5月BMD筛查的200例检查者作为研究对象,根据BMD分为骨量正常组(T值≥-1.0,n=105)、骨量减少组(-2.5<T值<-1.0,n=57)、OP组(T值≤-2.5,n=38)。对比三组一般资料及BMD、PMI、腰椎椎体骨髓FF,分析PMI、腰椎椎体骨髓FF与BMD间关系,建立OP的Logistic回归模型,评估PMI、腰椎椎体骨髓FF对OP的诊断效能。结果OP组BMD、PMI低于骨量减少组、骨量正常组,FF高于骨量减少组、骨量正常组(P<0.05);骨量减少组的BMD、PMI低于骨量正常组,FF高于骨量正常组(P<0.05);PMI与BMD呈正相关,腰椎椎体骨髓FF与BMD呈负相关(P<0.05);年龄、身体质量指数(body mass index,BMI)、PMI、腰椎椎体骨髓FF是骨量减少的影响因素,年龄、PMI、腰椎椎体骨髓FF是OP的影响因素(P<0.05);腰椎椎体骨髓FF联合诊断OP的受试者工作特征(receiver operating characteristic,ROC)曲线下的面积(area under curve,AUC)为0.853,大于单一指标诊断值(P<0.05)。结论PMI、腰椎椎体骨髓FF是BMD的独立影响因素,二者联合在OP诊断中具有较高效能。展开更多
文摘In order to observe the feature of age-related marrow conversion and maturation of epiphyseal cartilage and analyze the distribution of red and yellow marrow in the proximal femur at STIR MR imaging, STIR and T1 weighted MR imaging of the proximal femur in 52 subjects, aged 4 months to 25 years old, were retrospectively analyzed for the distribution and appearance of red and yellow marrow. The subjects with no known bone marrow abnormalities were divided into 6 age groups. The signal intensity of the marrow in the proximal epiphysis, proximal metaphysis, proximal diaphysis, distal diaphysis and greater trochanter was compared with the signal intensity and homogeneity of surrounding muscle and fat and graded by two observers. The results showed that the conversion of hematopoietic marrow in the proximal femur followed a well-defined sequence, occurring first in the proximal epiphysis, followed by the distal diaphysis, and then greater trochanter and metaphysis. STIR in combination with T1-weighted imaging could display clearly the origin of ossification center and the course of conversion from red to yellow marrow in proximal epiphysis and greater trochanter. STIR imaging showed that the marrow conversion in proximal metaphysic began below epiphyseal plate and intertrochanter. The site of red yellow was distributed in weight-bearing axis by 20 years of age. The marrow conversion of diaphysis was from distal end to proximal end, and the consequence of conversion was that distal diaphysis contained yellow marrow but proximal diaphysis partly red marrow connected with the red marrow of metaphysic. The epiphyseal cartilage had different characters of signal-intensity with age in STIR sequence. The distribution of red marrow in STIR imaging was more close to that of anatomy than T1-weighted imaging. It was concluded that STIR could dynamically display the feature of morrow conversion and the development of epiphyseal cartilage and accurately reveal the age-related distribution of red and yellow marrow on STIR imaging in the proximal femur.
文摘Purpose: Bone marrow and muscle adiposity have been considered to correlate with osteoporosis and Sarcopenia. Proton Density Fat Fraction (PDFF) can be measured by Magnetic Resonance Imaging (MRI). The purpose of the present study was to measure PDFF in the lumbar spine, paraspinal muscle and subcutaneous fat tissue. Methods: Participants were comprised of 30 patients (18 males, 12 females;age range, 14 - 87 years) who underwent MRI due to low back symptoms. PDFFs for the body of the fourth lumbar vertebra (L4), paraspinal muscle, and subcutaneous fat were measured. Results: PDFFs of the vertebral body and subcutaneous fat were significantly higher than that of paraspinal muscle (p < 0.001). PDFF was significantly higher for subcutaneous fat than for the vertebral body (p < 0.001). Although no significant differences in PDFF of the vertebral body, paraspinal muscle, and subcutaneous fat between females and males, PDFFs of the vertebral body and paraspinal muscle were significantly higher in older subjects (>63 years) than in younger subjects (Conclusions: PDFF of the vertebral body was significantly higher than that of paraspinal muscle. PDFFs of the vertebral body and paraspinal muscle were significantly lower in younger subjects than in older subjects.
文摘目的探讨腰肌指数(psoas muscle index,PMI)、腰椎椎体骨髓脂肪分数(fat fraction,FF)与骨密度(bone mineral density,BMD)间的关系及对骨质疏松(osteoporosis,OP)的诊断效能。方法选取四川省骨科医院2018年3月至2021年5月BMD筛查的200例检查者作为研究对象,根据BMD分为骨量正常组(T值≥-1.0,n=105)、骨量减少组(-2.5<T值<-1.0,n=57)、OP组(T值≤-2.5,n=38)。对比三组一般资料及BMD、PMI、腰椎椎体骨髓FF,分析PMI、腰椎椎体骨髓FF与BMD间关系,建立OP的Logistic回归模型,评估PMI、腰椎椎体骨髓FF对OP的诊断效能。结果OP组BMD、PMI低于骨量减少组、骨量正常组,FF高于骨量减少组、骨量正常组(P<0.05);骨量减少组的BMD、PMI低于骨量正常组,FF高于骨量正常组(P<0.05);PMI与BMD呈正相关,腰椎椎体骨髓FF与BMD呈负相关(P<0.05);年龄、身体质量指数(body mass index,BMI)、PMI、腰椎椎体骨髓FF是骨量减少的影响因素,年龄、PMI、腰椎椎体骨髓FF是OP的影响因素(P<0.05);腰椎椎体骨髓FF联合诊断OP的受试者工作特征(receiver operating characteristic,ROC)曲线下的面积(area under curve,AUC)为0.853,大于单一指标诊断值(P<0.05)。结论PMI、腰椎椎体骨髓FF是BMD的独立影响因素,二者联合在OP诊断中具有较高效能。
