Prager Marcel, Heiland Sabine, Gareis Daniel, Hilgenfeld Tim, Bendszus Martin, Gaudino Chiara
Division of Experimental Radiology, University Hospital Heidelberg, Im Neuenheimer Feld 400, 69120 Heidelberg, Germany; Department of Neuroradiology, University Hospital Heidelberg, Im Neuenheimer Feld 400, 69120 Heidelberg, Germany.
Division of Experimental Radiology, University Hospital Heidelberg, Im Neuenheimer Feld 400, 69120 Heidelberg, Germany; Department of Neuroradiology, University Hospital Heidelberg, Im Neuenheimer Feld 400, 69120 Heidelberg, Germany.
J Craniomaxillofac Surg. 2015 Dec;43(10):2175-82. doi: 10.1016/j.jcms.2015.10.011. Epub 2015 Oct 22.
To assess the benefit of a dedicated surface coil to visualize dental structures in comparison to standard head/neck coil.
Measurements were performed using the standard head/neck coil and a dedicated array coil for dental MRI at 3 T. As MRI methods, we used a T1-weighted spin-echo sequence with and without spectral fat saturation, a T2-weighted turbo-spin-echo sequence and a 3-dimensional T2-weighted SPACE sequence. Measurements were performed in a phantom to examine sensitivity profiles. Then the signal gain in dental structures was examined in volunteers and in a patient.
As expected for a surface coil, the signal gain of the dental coil was highest at the surface of the phantom and decreased with increasing distance to the coil; it was >120% even at a depth of 30 mm, measured from the centre of the coil. The signal gain within the pulp of the volunteers ranged between 236 and 413%.
The dedicated array coil offers a significantly higher signal within the region of interest for dental MR imaging thus allowing for better depiction of pathologies within the periodontium and for delineation and tracking of the branches of the maxillary and mandibular nerves.
评估与标准头/颈线圈相比，专用表面线圈在可视化牙齿结构方面的优势。
在3T场强下，使用标准头/颈线圈和用于牙科MRI的专用阵列线圈进行测量。作为MRI方法，我们使用了带有和不带有频谱脂肪饱和的T1加权自旋回波序列、T2加权快速自旋回波序列以及三维T2加权SPACE序列。在模型中进行测量以检查灵敏度分布。然后在志愿者和一名患者中检查牙齿结构的信号增益。
正如表面线圈所预期的那样，牙科线圈的信号增益在模型表面最高，并随着与线圈距离的增加而降低；即使从线圈中心测量深度达30mm处，信号增益仍>120%。志愿者牙髓内的信号增益在236%至413%之间。
专用阵列线圈在牙科MR成像的感兴趣区域内提供了显著更高的信号，从而能够更好地描绘牙周组织内的病变以及对上颌和下颌神经分支进行描绘和追踪。
