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上顎洞のグラフト評価のための磁気共鳴画像とコーンビームコンピュータ断層撮影との相関性
Correlation between magnetic resonance imaging and cone-beam computed tomography for maxillary sinus graft assessment.
PMID: 32601583 PMCID: PMC7314607. DOI: 10.5624/isd.2020.50.2.93.
抄録
目的:
副鼻腔移植片の評価において、許容可能なスキャン時間を持つ臨床用MRI(磁気共鳴画像法)プロトコルの精度については、ほとんど知られていない。本研究の目的は、2種類の臨床用MRI画像プロトコルを用いて、MRIとコーンビームコンピュータ断層撮影(CBCT)の測定値の相関関係を評価することであった。
Purpose: Little is known regarding the accuracy of clinical magnetic resonance imaging (MRI) protocols with acceptable scan times in sinus graft assessment. The aim of this study was to evaluate the correlations between MRI and cone-beam computed tomographic (CBCT) measurements of maxillary sinus grafts using 2 different clinical MRI imaging protocols.
材料と方法:
二相性リン酸カルシウムを用いた片側副鼻腔リフト手術を受けた患者15人を本研究に含めた。サイナスリフト手術の6ヵ月後にCBCT、T1強調MRI、T2強調MRIを撮影した。冠状画像における最大高さと頬舌幅、矢状画像における最大前後深さの線形測定を、訓練を受けた2人のオブザーバーがCBCTとMRI Digital Imaging and Communication in Medicineのファイルを使用して行った。移植部位の骨組織の存在を確認するために、マイクロコンピュータ断層撮影(micro-CT)も実施した。MRIとCBCT測定値の間の相関は、ピアソン検定を用いて評価した。
Materials and Methods: A total of 15 patients who underwent unilateral sinus lift surgery with biphasic calcium phosphate were included in this study. CBCT, T1-weighted MRI, and T2-weighted MRI scans were taken 6 months after sinus lift surgery. Linear measurements of the maximum height and buccolingual width in coronal images, as well as the maximum anteroposterior depth in sagittal images, were performed by 2 trained observers using CBCT and MRI Digital Imaging and Communication in Medicine files. Microcomputed tomography (micro-CT) was also performed to confirm the presence of bone tissue in the grafted area. Correlations between MRI and CBCT measurements were assessed with the Pearson test.
結果:
CBCTとMRIの間には、サイナスグラフトの高さ(T1-weighted, r=0.711 and <0.05; T2-weighted, r=0.713 and <0.05)、頬舌幅(T1-weighted, r=0.892 and <0.05; T2-weighted, r=0.956 and <0.05)、および前方後方深さ(T1-weighted, r=0.731 and <0.05)に有意な相関が認められた。892および<0.05;T2加重、r=0.956および<0.05)、および前後深さ(T1加重、r=0.731および<0.05;T2加重、r=0.873および<0.05)。移植部の骨組織の存在はmicro-CTで確認した。
Results: Significant correlations between CBCT and MRI were found for sinus graft height (T1-weighted, r=0.711 and <0.05; T2-weighted, r=0.713 and <0.05), buccolingual width (T1-weighted, r=0.892 and <0.05; T2-weighted, r=0.956 and <0.05), and anteroposterior depth (T1-weighted, r=0.731 and <0.05; T2-weighted, r=0.873 and <0.05). The presence of bone tissue in the grafted areas was confirmed via micro-CT.
結論:
検査した両方のMRIパルスシーケンスは、CBCTとの強い相関が認められたため、副鼻腔グラフトの測定に使用することができる。しかし、T2強調MRIとCBCTの間の相関は、T1強調MRIとCBCTの間の相関よりもわずかに高かった。
Conclusion: Both MRI pulse sequences tested can be used for sinus graft measurements, as strong correlations with CBCT were found. However, correlations between T2-weighted MRI and CBCT were slightly higher than those between T1-weighted MRI and CBCT.
Copyright © 2020 by Korean Academy of Oral and Maxillofacial Radiology.