Lee Kwangsoon, Kaneda Takashi, Mori Shintaro, Minami Manabu, Motohashi Junko, Yamashiro Mitsuaki
Department of Radiology, Nihon University Graduate School of Dentistry at Matsudo, Chiba, Japan.
Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2003 Oct;96(4):499-507. doi: 10.1016/s1079-2104(03)00351-2.
We sought to determine the suitable magnetic resonance imaging conditions for the short inversion time inversion recovery (STIR) sequence through the use of phantoms; to describe the signal characteristics of normal structures in the mandible; and to evaluate the usefulness of STIR images in enabling the identification of mandibular osteomyelitis on conventional T1- and T2-weighted spin-echo images.
Suitable mandibular STIR imaging conditions were determined by varying inversion time and repetition time in each sequence. STIR magnetic resonance images of 162 healthy subjects and STIR and T1- and T2-weighted spin-echo images of 21 subjects with mandibular osteomyelitis were evaluated.
In STIR imaging, the signal of oil was suppressed at an inversion time equaling 100 milliseconds and a repetition time equaling 1500 to 3000 milliseconds. In healthy subjects, the mandibular marrow was revealed to have high signal intensities (100%) and cortical bone had no signal intensities (100%) on STIR images. In surrounding soft tissue in these healthy subjects, the submandibular glands were shown to have high signal intensities (100%); the parotid glands had intermediate to high signal intensities (100%); the sublingual glands had high (88.9%) and intermediate to high (11.1%) signal intensities; lymph nodes had high signal intensities (100%); and the masseter muscles had intermediate signal intensities (100%) on STIR images. The lesions in bone marrow had low (75%) and low to intermediate (25%) signal intensities on T1-weighted images and high (54%), intermediate to high (29%), and intermediate (17%) signal intensities on T2-weighted images. On STIR images, the signal intensities resulted in high (75%), intermediate to high (21%), and intermediate (4%) signal intensities.
STIR imaging is highly effective for the evaluation of bone marrow and surrounding soft tissue in terms of the detection of osteomyelitis in the mandible and the identification of inflammation spreading to soft tissue.
我们试图通过使用体模来确定短反转时间反转恢复（STIR）序列合适的磁共振成像条件；描述下颌骨正常结构的信号特征；并评估STIR图像在常规T1加权和T2加权自旋回波图像上识别下颌骨骨髓炎的有用性。
通过改变每个序列中的反转时间和重复时间来确定合适的下颌骨STIR成像条件。对162名健康受试者的STIR磁共振图像以及21名下颌骨骨髓炎患者的STIR图像、T1加权和T2加权自旋回波图像进行评估。
在STIR成像中，当反转时间等于100毫秒且重复时间等于1500至3000毫秒时，油的信号被抑制。在健康受试者中，STIR图像显示下颌骨骨髓具有高信号强度（100%），皮质骨无信号强度（100%）。在这些健康受试者的周围软组织中，STIR图像显示颌下腺具有高信号强度（100%）；腮腺具有中等至高信号强度（100%）；舌下腺具有高信号强度（88.9%）和中等至高信号强度（11.1%）；淋巴结具有高信号强度（100%）；咬肌具有中等信号强度（100%）。骨髓病变在T1加权图像上具有低信号强度（75%）和低至中等信号强度（25%），在T2加权图像上具有高信号强度（54%）、中等至高信号强度（29%）和中等信号强度（17%）。在STIR图像上，信号强度为高信号强度（75%）、中等至高信号强度（21%）和中等信号强度（4%）。
就检测下颌骨骨髓炎以及识别蔓延至软组织的炎症而言，STIR成像在评估骨髓和周围软组织方面非常有效。
