Purpose:To evaluate the usefulness of 3DFT CISS MR myelography(MRM) by comparing it with 3DFT FISP MRM. Materials and Methods:Thirty-four subjects consisting of normal volunteers and patients complaining of back pain underwent lumbar spine MRI, 3DFT CISS MRM, and 3 DFT FISP MRM. The 3DFT FISP MRM and 3 DFT CISS MRM images were analysed and in each case, the following were compared:sharpness of the dural sac;differentiation of nerve roots and CSF;vistalization of the nerve root sleeve and of dural sac compression. Results:Image acquistion time of sDFT CISS MRM was shorter than that of 3DFT FISP MRM, and the former was significantly superior to the latter in sharpness of the dural sac(86%, p=0.004), differentiation of nerve roots and CSF(74%, p=0.0168), and visualization of dural sac compression(90%, p=0.0016). With regard to visualization of nerve root sleeves, 3DFT CISS MRM was superior to 3DFT FISP MRM, but not significantly (68%, p=0.0872). Couclusion:3DFT CISS MRM requires a shorter image acquisition time and gives a better image than 3DFT FISP MRM;we therefore consider it to be a useful MR method.