Stehling Christoph, Vieth Volker, Bachmann Rainald, Nassenstein Isabelle, Kugel Harald, Kooijman Hendrik, Heindel Walter, Fischbach Roman
Department of Clinical Radiology, University of Muenster, Münster, Germany.
Invest Radiol. 2007 Jun;42(6):428-34. doi: 10.1097/01.rli.0000262081.23997.6b.
To assess the image quality of a high-resolution imaging protocol for the temporomandibular joint (TMJ) at 3.0 T and to compare it with our standard 1.5 T protocol.
Fifteen volunteers without history of TMJ dysfunction underwent bilateral magnetic resonance imaging (MRI) of the TMJ with the jaw in closed and open position. MRI was performed with using a 1.5 T (standard TMJ coil) and 3.0 T (purpose build phased array coil) MR system (Gyroscan Intera 1.5 T and 3.0 T; Philips Medical Systems, Best, the Netherlands). Imaging protocols consisted of a parasagittal PDw-TSE sequence and a coronal PDw-TSE sequence in closed mouth position and a sagittal PDw-TSE sequence in open mouth position. Acquisition parameters were adjusted for 3.0 T and voxel size was reduced from 0.29 x 0.29 x 3.0 mm (1.5 T) to 0.15 x 0.15 x 1.5 mm (3.0 T). Total examination time (15 minutes) was similar for both systems. Two observers assessed in consensus delineation, image quality, and artifacts of anatomic landmarks (disk, bilaminar zone, capsular attachment, cortical bone) and ranked them qualitatively on a 5-point scale from 1 (optimal) to 5 (nondiagnostic). Disk position and motility was noted. For CNR analysis, signal intensity from disk and retrodiscal tissue was measured.
Disk position and mobility was identical at both field strengths. All anatomic landmarks were visualized significantly better at 3.0 T. In particular, the capsular attachment was depicted in more detail. Overall image quality was ranked significantly higher at 3.0 T, whereas artifact score was similar. Quantitative evaluation showed significantly higher CNR for 3.0 T (10.23 vs. 8.08, P < 0.0001).
Depiction of the normal anatomy of the TMJ benefits significantly when investing the higher SNR at 3.0 T into better spatial resolution. We anticipate that this advantage of 3.0 T MRI will also permit a more detailed analysis of capsular and disk pathology.
评估颞下颌关节（TMJ）在3.0 T时高分辨率成像协议的图像质量，并将其与我们的标准1.5 T协议进行比较。
15名无颞下颌关节功能障碍病史的志愿者在闭口和开口位置接受了双侧颞下颌关节磁共振成像（MRI）检查。使用1.5 T（标准颞下颌关节线圈）和3.0 T（特制相控阵线圈）MR系统（Gyroscan Intera 1.5 T和3.0 T；飞利浦医疗系统公司，荷兰贝斯特）进行MRI检查。成像协议包括闭口位矢状面PDw-TSE序列、冠状面PDw-TSE序列以及开口位矢状面PDw-TSE序列。针对3.0 T调整了采集参数，体素大小从0.29×0.29×3.0 mm（1.5 T）减小至0.15×0.15×1.5 mm（3.0 T）。两个系统的总检查时间（15分钟）相似。两名观察者共同评估解剖标志（盘、双板区、关节囊附着、皮质骨）的勾画、图像质量和伪影，并根据1（最佳）至5（非诊断性）的5分制进行定性排名。记录盘的位置和活动度。进行CNR分析时，测量盘和盘后组织的信号强度。
在两个场强下，盘的位置和活动度相同。所有解剖标志在3.0 T时的显示明显更好。特别是，关节囊附着显示得更详细。总体图像质量在3.0 T时的排名明显更高，而伪影评分相似。定量评估显示3.0 T时的CNR明显更高（10.23对8.08，P < 0.0001）。
将3.0 T时更高的SNR用于提高空间分辨率，对颞下颌关节正常解剖结构的显示有显著益处。我们预计3.0 T MRI的这一优势也将有助于对关节囊和盘病变进行更详细的分析。
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