Dental Magnetic Resonance Imaging: Making the Invisible Visible
Dental Magnetic Resonance Imaging: Making the Invisible Visible
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DOI：
10.1016/j.joen.2011.02.022
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发表时间：
2011-06-01
影响因子：
4.2
通讯作者：
Nixdorf, Donald R.
中科院分区：
文献类型：
--
作者：
Idiyatullin, Djaudat;Corum, Curt;Nixdorf, Donald R.
前言：临床牙科需要无创、准确的诊断方法来更好地评估牙病。这项工作的目的是评估最近开发的磁共振成像(MRI)技术，称为扫描成像傅里叶变换(SWIFT)，以可视化牙齿组织的可行性。方法：使用9.4T系统，扫描时间从100秒到25分钟，对三颗代表有限临床条件的体外牙齿进行成像。使用4T系统对受试者进行体内成像，扫描时间为10分钟。将SWIFT图像与传统的二维X线片、三维锥束计算机断层扫描(CBCT)、梯度回波MRI技术和组织切片进行比较。结果：离体牙的分辨率为100am。斯威夫特还发现了龋齿和牙齿的细微结构的存在和程度，包括裂缝和副牙道，这在现有的临床放射成像技术中是看不到的。射频线圈的口腔内定位以400am的分辨率产生了多个相邻牙齿的初始图像结论：SWIFT MRI提供了牙齿的同步三维硬组织和软组织成像，而不使用电离辐射。此外，它有可能在临床相关的扫描时间内对微小的牙齿结构进行成像。这项技术对牙髓医生有意义，因为它提供了一种潜在的方法来纵向评估牙髓和牙根结构已再生的牙齿。(J截止2011年；37：745-752)
Introduction: Clinical dentistry is in need of noninvasive and accurate diagnostic methods to better evaluate dental pathosis. The purpose of this work was to assess the feasibility of a recently developed magnetic resonance imaging (MRI) technique, called SWeep Imaging with Fourier Transform (SWIFT), to visualize dental tissues. Methods: Three in vitro teeth, representing a limited range of clinical conditions of interest, imaged using a 9.4T system with scanning times ranging from 100 seconds to 25 minutes. In vivo imaging of a subject was performed using a 4T system with a 10-minute scanning time. SWIFT images were compared with traditional two-dimensional radiographs, three-dimensional cone-beam computed tomography (CBCT) scanning, gradient-echo MRI technique, and histological sections. Results: A resolution of 100 Am was obtained from in vitro teeth. SWIFT also identified the presence and extent of dental caries and fine structures of the teeth, including cracks and accessory canals, which are not visible with existing clinical radiography techniques. Intraoral positioning of the radiofrequency coil produced initial images of multiple adjacent teeth at a resolution of 400 Am. Conclusions: SWIFT MRI offers simultaneous three-dimensional hard- and soft-tissue imaging of teeth without the use of ionizing radiation. Furthermore, it has the potential to image minute dental structures within clinically relevant scanning times. This technology has implications for endodontists because it offers a potential method to longitudinally evaluate teeth where pulp and root structures have been regenerated. (J Ended 2011;37:745-752)