摘要
目的探讨眼眶磁共振扫描成像技术。方法采用GE1.5TsignaEchospeed或GE1.5TsignaTwinspeed,对30例患者做眼眶磁共振成像(MagneticResonanceImaging)。脉冲序列:SET1加权(weightedImagingWI),FSET2加权(weightedImagingWI),T2WI采用脂肪抑制技术或SET1flair,FRFSET2WIT2WI采用脂肪抑制技术。扫描方位:横轴位(Axial)、冠状位(Coronal)、矢状斜位(ObliqueSagittal)和横轴俯卧位(prone)等。扫描参数:Fov18cm×18cm,SET1WI:TR440msTE11ms,FSET2WI:TR3000msTE98ms或T1flair:TR2143ms,TE11ms,TI750ms,FRFSET2WI:TR3500msTE80ms,矩阵256×256,接收带宽15.63MHz,平均激励次数4次,层厚3～4mm,无间隔。增强对比剂用GdDTPA0.1mmolkg。结果横轴位可清晰显示视神经全长及眼内外直肌及与病变的关系。冠状位在同一层面可清晰显示视神经、眼内外直肌、眼上下直肌的断面及与病变的关系。矢状斜位可清晰显示视神经全长、眼上下直肌及与病变的关系。结论磁共振扫描参数的优化组合和选择正确的扫描方位,及T2WI脂肪抑制技术等的应用更有助于显示正常眼眶解剖结构及眼眶病变的定位和诊断。
Objective To investigate the MR imaging technology of orbit. Methods Magnetic resonance imaging （MRI） in orbit of 30 patients were performed by GE 1.5 T Signa Echo speed or GE 1.5 T Signa Twin speed. Pulse Sequence： SE Tlweighted imaging （WI） FSE T2WI, T2WI fat suppression （FS） technology or SETI flair FRFSE T2WI, T2WI FS technology. Patient position： axial coronal and oblique sagittal, supine, prone. Parameters： Fov, 18 cm × 18 cm, SE T1WI, TR440ms TE11ms, FSE, T2WI TR3000 ms TE98 ms or T1flair TR2143 ms TE11ms T1750 ms, FRFSE T2WI, TR3500 ms TE80 ms. Matrix 256 × 256, receiving bandwidth 15.63 MHz. Nex 4 times, slice thickness 3-4 mm. No spacing. 0.1 mol/kg Gd-DTPA was used to contrast. Results The whole optic nerve, medial lateral rectus muscle and lesions were displayed clearly on axial section, The optic nerve, medial lateral rectus muscle and superior inferior rectus muscle were displayed clearly on coronal section of the same plan. The whole optic nerve, superior inferior rectus muscle and lesions were displayed clearly on oblique sagittal section. Conclusion Parameters such as MRI pulse sequense, patient position, fat suppression technology, showld be taken together for good location in taking photos. These are helpful to display anatomic structures the orbit and to take site, qualitative analysis of orbital lesions.
出处
《中华放射医学与防护杂志》
CAS
CSCD
北大核心
2005年第5期474-476,共3页
Chinese Journal of Radiological Medicine and Protection
