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磁共振影像(MRI)是一种应用很广泛的诊断方法,但是,某些常用于牙科的金属可以造成影像变坏,影响头颈部的诊断,因而限制了该方法在颅、面、颈部的应用。材料和方法用试验的10种牙用金属或合金制成直径4.0mm厚2.0mm的圆盘。受试者测试前拍正常MR影像,并制作一个石膏模型,在该模型上制作夹板,用自凝树脂将每种测试的金属圆盘分次安装到分离夹板上,然后将圆盘固定在受试者腭中缝与第二前磨牙的交汇点上。用部分磁性饱和的连续脉冲(TE18ms,TR100ms),用0.1T Asaki MRI制作所有的MRI。每个
Magnetic resonance imaging (MRI) is a widely used diagnostic method, but some commonly used in dental metal can cause deterioration of the image, affecting the head and neck diagnosis, thus limiting the method in the skull, face, neck Applications. Materials and Methods Ten disks of dental metal or alloy were tested to make disks having a diameter of 4.0 mm and a thickness of 2.0 mm. Subjects tested normal MR images prior to testing and produced a gypsum model on which a splint was made. Each test metal disc was mounted on separate splints with self-setting resin, and then the disc was fixed on The intersection of the palatal suture and the second premolar. All MRIs were made with 0.1 T Asaki MRI using partially magnetically saturated continuous pulses (TE18 ms, TR 100 ms). Each one