Abstract：
OBJECTIVE: To investigate the feasibility of MRI nerve-bone fusion imaging in assessing the relationship between inferior alveolar nerve (IAN) / mandibular canal (MC) and mandibular third molar (MTM) compared with MRI-CBCT fusion.
METHODS: The MRI nerve-bone fusion and MRI-CBCT fusion imaging were performed in 20 subjects with 37 MTMs. The Hausdorff distance (HD) value and dice similarity coefficient (DSC) was calculated. The relationship between IAN/MC and MTM roots, inflammatory, and fusion patterns were compared between these two fused images. The reliability was assessed using a weighted κ statistic.
RESULTS: The mean HD and DSC ranged from 0.62 ~ 1.35 and 0.83 ~ 0.88 for MRI nerve-bone fusion, 0.98 ~ 1.50 and 0.76 ~ 0.83 for MRI-CBCT fusion. MR nerve-bone fusion had considerable reproducibility compared to MRI-CBCT fusion in relation classification (MR nerve-bone fusion κ = 0.694, MRI-CBCT fusion κ = 0.644), direct contact (MR nerve-bone fusion κ = 0.729, MRI-CBCT fusion κ = 0.720), and moderate to good agreement for inflammation detection (MR nerve-bone fusion κ = 0.603, MRI-CBCT fusion κ = 0.532, average). The MR nerve-bone fusion imaging showed a lower ratio of larger pattern compared to MR-CBCT fusion (16.2% VS 27.3% in the molar region, and 2.7% VS 5.4% in the retromolar region). And the average time spent on MR nerve-bone fusion and MRI-CBCT fusion was 1 min and 3 min, respectively.
CONCLUSIONS: Both MR nerve-bone fusion and MRI-CBCT fusion exhibited good consistency in evaluating the spatial relationship between IAN/MC and MTM, fusion effect, and inflammation detection.
CONCLUSIONS: MR nerve-bone fusion imaging can be a preoperative one-stop radiation-free examination for patients at high risk for MTM surgery.
METHODS: The MRI nerve-bone fusion and MRI-CBCT fusion imaging were performed in 20 subjects with 37 MTMs. The Hausdorff distance (HD) value and dice similarity coefficient (DSC) was calculated. The relationship between IAN/MC and MTM roots, inflammatory, and fusion patterns were compared between these two fused images. The reliability was assessed using a weighted κ statistic.
RESULTS: The mean HD and DSC ranged from 0.62 ~ 1.35 and 0.83 ~ 0.88 for MRI nerve-bone fusion, 0.98 ~ 1.50 and 0.76 ~ 0.83 for MRI-CBCT fusion. MR nerve-bone fusion had considerable reproducibility compared to MRI-CBCT fusion in relation classification (MR nerve-bone fusion κ = 0.694, MRI-CBCT fusion κ = 0.644), direct contact (MR nerve-bone fusion κ = 0.729, MRI-CBCT fusion κ = 0.720), and moderate to good agreement for inflammation detection (MR nerve-bone fusion κ = 0.603, MRI-CBCT fusion κ = 0.532, average). The MR nerve-bone fusion imaging showed a lower ratio of larger pattern compared to MR-CBCT fusion (16.2% VS 27.3% in the molar region, and 2.7% VS 5.4% in the retromolar region). And the average time spent on MR nerve-bone fusion and MRI-CBCT fusion was 1 min and 3 min, respectively.
CONCLUSIONS: Both MR nerve-bone fusion and MRI-CBCT fusion exhibited good consistency in evaluating the spatial relationship between IAN/MC and MTM, fusion effect, and inflammation detection.
CONCLUSIONS: MR nerve-bone fusion imaging can be a preoperative one-stop radiation-free examination for patients at high risk for MTM surgery.
摘要：
目的：与MRI-CBCT融合相比，探讨MRI神经-骨融合成像评估下牙槽神经（IAN）/下颌管（MC）与下颌第三磨牙（MTM）之间关系的可行性。
方法：对20例受试者进行了MRI神经-骨融合和MRI-CBCT融合成像，共37例MTM。计算Hausdorff距离（HD）值和骰子相似系数（DSC）。IAN/MC和MTM根之间的关系，炎症，并比较了这两幅融合图像的融合模式。使用加权κ统计量评估可靠性。
结果：MRI神经-骨融合的平均HD和DSC范围为0.62~1.35和0.83~0.88，MRI-CBCT融合0.98~1.50和0.76~0.83。与MRI-CBCT融合相关分类相比，MR神经-骨融合具有相当的可重复性（MR神经-骨融合κ=0.694，MRI-CBCT融合κ=0.644），直接接触（MR神经-骨融合κ=0.729，MRI-CBCT融合κ=0.720），与炎症检测的中度到良好的一致性（MR神经-骨融合κ=0.603，MRI-CBCT融合κ=0.532，平均）。与MR-CBCT融合相比，MR神经-骨融合成像显示较大模式的比率较低（磨牙区域为16.2％VS27.3％，和后磨牙区的2.7%VS5.4%)。MR神经-骨融合和MRI-CBCT融合的平均时间为1min和3min,分别。
结论：MR神经-骨融合和MRI-CBCT融合在评价IAN/MC与MTM的空间关系方面均表现出良好的一致性。融合效应,和炎症检测。
结论：MR神经-骨融合成像可作为MTM手术高危患者术前一站式无辐射检查。
方法：对20例受试者进行了MRI神经-骨融合和MRI-CBCT融合成像，共37例MTM。计算Hausdorff距离（HD）值和骰子相似系数（DSC）。IAN/MC和MTM根之间的关系，炎症，并比较了这两幅融合图像的融合模式。使用加权κ统计量评估可靠性。
结果：MRI神经-骨融合的平均HD和DSC范围为0.62~1.35和0.83~0.88，MRI-CBCT融合0.98~1.50和0.76~0.83。与MRI-CBCT融合相关分类相比，MR神经-骨融合具有相当的可重复性（MR神经-骨融合κ=0.694，MRI-CBCT融合κ=0.644），直接接触（MR神经-骨融合κ=0.729，MRI-CBCT融合κ=0.720），与炎症检测的中度到良好的一致性（MR神经-骨融合κ=0.603，MRI-CBCT融合κ=0.532，平均）。与MR-CBCT融合相比，MR神经-骨融合成像显示较大模式的比率较低（磨牙区域为16.2％VS27.3％，和后磨牙区的2.7%VS5.4%)。MR神经-骨融合和MRI-CBCT融合的平均时间为1min和3min,分别。
结论：MR神经-骨融合和MRI-CBCT融合在评价IAN/MC与MTM的空间关系方面均表现出良好的一致性。融合效应,和炎症检测。
结论：MR神经-骨融合成像可作为MTM手术高危患者术前一站式无辐射检查。
