Deepho Chutamas, Watanabe Hiroshi, Kotaki Shinya, Sakamoto Junichiro, Sumi Yasunori, Kurabayashi Tohru
1 Department of Oral and Maxillofacial Radiology, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan.
2 National Center of Advanced Medicine for Dental and Oral Diseases, National Center for Geriatrics and Gerontology, Obu, Japan.
Dentomaxillofac Radiol. 2017 Mar;46(3):20160383. doi: 10.1259/dmfr.20160383. Epub 2017 Feb 17.
The purpose of this study was to investigate whether CT/MRI fusion volumetric images can improve the detectability of the mandibular canal (MC) compared with CT alone.
Images of 31 lesions within or close to the mandible using both multislice CT (MSCT) and MRI were gathered from our imaging archives. All lesions underwent MSCT and three-dimensional volumetric interpolated breath-hold examination (3D-VIBE) MRI. Of the 62 hemimandibles, 13 hemimandibles were excluded because the MC passed through a lesion. The remaining 49 hemimandibles were included in this study. Each hemimandible was divided into 3 areas (premolar, molar and retromolar), and 147 areas were evaluated. First, the visibility of the MC on CT or its neurovascular bundle (NVB) on 3D-VIBE was evaluated. Second, in areas in which both the MC and NVB were visible, the relative locations of the NVB on MRI and the position of the MC on CT were assessed using CT/MRI fusion volumetric images.
The MC and NVB were clearly visible in 100 (68%) and 144 (98%) of 147 areas on CT and MRI, respectively. All NVBs and MCs were in identical locations, and the NVB on MRI was the same size or smaller than the MC on CT in 79 and 21 areas, respectively.
3D-VIBE MRI can accurately depict the NVB. Compared with CT alone, CT/MRI fusion volumetric imaging improves MC detectability.
本研究旨在调查与单纯CT相比，CT/MRI融合容积图像是否能提高下颌管（MC）的可检测性。
从我们的影像存档中收集了31例下颌骨内或靠近下颌骨病变的多排CT（MSCT）和MRI图像。所有病变均接受了MSCT和三维容积内插屏气检查（3D-VIBE）MRI。在62侧半下颌骨中，13侧半下颌骨因下颌管穿过病变而被排除。其余49侧半下颌骨纳入本研究。每侧半下颌骨分为3个区域（前磨牙区、磨牙区和磨牙后区），共评估147个区域。首先，评估CT上MC的可视性或3D-VIBE上其神经血管束（NVB）的可视性。其次，在MC和NVB均可见的区域，使用CT/MRI融合容积图像评估MRI上NVB的相对位置和CT上MC的位置。
在147个区域中，CT和MRI上MC和NVB分别在100个（68%）和144个（98%）区域清晰可见。所有NVB和MC位置相同，在79个和21个区域中，MRI上的NVB分别与CT上的MC大小相同或更小。
3D-VIBE MRI能准确描绘NVB。与单纯CT相比，CT/MRI融合容积成像提高了MC的可检测性。
