利用超短回波时间MRI对T1DM兔胫骨孔隙度的纵向体内评估。

IF 3.5 2区 医学 Q1 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING
Kejun Wang, Weiyin Vivian Liu, Yajun Ma, Zhao Wei, Haoran Lei, Chuanyun Jiang, Minzhi Pei, Yunfei Zha
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引用次数: 0

摘要

背景:1型糖尿病(T1DM)增加骨折风险。糖尿病进展过程中皮质孔隙度的纵向变化尚不清楚。目的:以微ct (μCT)和骨重塑生物标志物为参考,利用超短回波时间(UTE)-MRI评估T1DM兔模型胫骨皮质孔隙度和几何形状的变化。研究类型:纵向,动物模型。动物模型:雄性日本大白兔28只,年龄8 ~ 10周龄,体重2.14±0.24 kg,随机分为糖尿病亚组(n = 16)和对照组(n = 12)。场强/序列:3t;三维双回波UTE序列和三维反演恢复(IR)-UTE序列。评估:在基线和多个时间点进行UTE-MRI检查。孔隙度指数(PI)、抑制比(SR)和皮质厚度分别通过2.2和0.032 ms的回波时间(TE)信号强度(SI)、0.032 ms时UTE的SI与TE的IR-UTE进行评估,并基于几何模型。μ ct衍生孔隙率、孔径和皮质厚度于第24周测定。免疫组织化学和定量聚合酶链反应(qPCR)分析骨重塑标志物。统计检验:采用t检验/Mann-Whitney U检验和重复测量方差分析进行组间比较。Spearman相关系数(r)评估PI与骨标志物之间的关联强度。结果:24周T1DM兔的皮质孔隙度(0.42±0.05比0.32±0.04)和皮质厚度(0.92±0.11比1.40±0.18)明显高于对照组,与μCT测量值一致。PI与μ ct测量的孔隙率、孔径呈显著正相关(r = 0.91、0.69),SR与PI无显著正相关(r = -0.33, p = 0.11; r = -0.25, p = 0.25)。与对照组相比,T1DM兔从第12周开始PI显著升高(0.35±0.05比0.31±0.04)。糖尿病家兔成骨细胞和破骨细胞相关细胞数量及表达与PI呈负相关(r = -0.871 ~ -0.625)。数据结论:UTE-MRI具有纵向监测和识别早期可逆性皮质孔隙度和几何变化的潜力。证据等级:1。技术功效:第二阶段。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Longitudinal In Vivo Assessment of Tibia Bone Porosity in T1DM Rabbits Using Ultrashort Echo Time MRI.

Background: Type 1 diabetes mellitus (T1DM) raises fracture risk. Longitudinal changes in cortical porosity during diabetes progression are unclear.

Purpose: To assess, using ultra short echo time (UTE)-MRI for tibia cortical porosity and geometry changes in T1DM rabbit model, using micro-CT (μCT) and bone remodeling biomarkers as reference.

Study type: Longitudinal, animal model.

Animal model: Twenty-eight male Japanese white rabbits (age: 8-10 weeks, weight: 2.14 ± 0.24 kg) randomized to diabetic (n = 16) and control (n = 12) subgroups.

Field strength/sequence: 3 T; 3D dual-echo UTE and 3D inversion recovery (IR)-UTE sequences.

Assessment: UTE-MRI were performed at baseline and multiple timepoints. Porosity index (PI), suppression ratio (SR), and cortical thickness were assessed accordingly via the signal intensity (SI) at echo time (TE) at 2.2 and 0.032 ms, SI of UTE to IR-UTE of TE at 0.032 ms, and based on geometric modeling. μCT-derived porosity, pore diameter, and cortical thickness were conducted at week 24. Immunohistochemistry and quantitative polymerase chain reaction (qPCR) analyzed bone remodeling markers.

Statistical tests: Group comparisons were made using t tests/Mann-Whitney U tests and repeated measures ANOVA. Spearman correlation coefficients (r) assessed the strength of the associations between PI and bone markers. A p value < 0.05 was considered significant.

Results: 24-week T1DM rabbits had significantly UTE-MRI-measured higher cortical porosity (0.42 ± 0.05 vs. 0.32 ± 0.04) and lower cortical thickness (0.92 ± 0.11 vs. 1.40 ± 0.18) than the control group, consistent with μCT measurements. PI was significantly positively correlated with μCT-measured porosity and pore diameter (r = 0.91, 0.69, respectively), while SR showed no correlation (r = -0.33, p = 0.11; r = -0.25, p = 0.25). PI increased significantly in T1DM rabbits from week 12 compared to the controls (0.35 ± 0.05 vs. 0.31 ± 0.04). The lower osteoblast and osteoclast-related cell numbers and expression were negatively correlated with PI in diabetic rabbits (r = -0.871 to -0.625).

Data conclusion: UTE-MRI has the potential to longitudinally monitor and identify early reversible cortical porosity and geometric changes.

Evidence level: 1.

Technical efficacy: Stage 2.

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来源期刊
CiteScore
9.70
自引率
6.80%
发文量
494
审稿时长
2 months
期刊介绍: The Journal of Magnetic Resonance Imaging (JMRI) is an international journal devoted to the timely publication of basic and clinical research, educational and review articles, and other information related to the diagnostic applications of magnetic resonance.
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