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MR angiography of the abdominal artery has been often performed using contrast agents. Recent attention has focused on non-contrast MR techniques for evaluating the abdominal artery and cardio vascular, most notably Steady-State Free Precession (SSFP; also termed balanced FFE, true-FISP, and FIESTA). In this study an IR-prepared, segmented TrueFISP sequence has been introduced at 3T. Four volunteers...
In this study, we made clear that we could depict spinal cord directly by using a diffusion weighted image. Conventional MR myelography is a water emphasis image depicting CSF (cerebrospinal fluid) to a high signal. It may be said that we catch spinal cord indirectly anatomically because the spinal cord is covered in CSF. We depicted CSF to a low signal, and a useful thing was shown in the diffusion...
Radiofrequency (RF) coils for magnetic resonance imaging (MRI) and spectroscopy (MRS) have been developed for resonance at 8.3 MHz, and 200 MHz. The coils work in any direction in the main static magnetic field of MRI machines. Therefore, the coil has at least two loops orthogonal to each other. At least one loop of the coil generates magnetic flux which has a perpendicular component to the main static...
Turbo Spin Echo (TSE) method is widely used for an MR examination. However, the periodical motion artifacts such as a throb of the bloodstream, the cerebrospinal fluid and patient's moving are much observed in TSE image than the conventional Spin Echo (conv.SE) image and the Gradient Echo (GrE) image. This originates in k-space trajectory peculiar to TSE method. Randomized Phase Encoding TSE is a...
In a magnetic field of 3.0Tesla, motion artifacts are more serious, particularly in MRI of the moving upper abdomen, than those in a field of 1.5Tesla or lower. We carried out free-breathing Prospective Acquisition Correction (PACE) T2-weighted imaging of the upper abdomen in order to control the motion artifacts produced with a 3Tesla MRI System. We employed five volunteers for free-breathing T2-weighted...
MR myelography (MR imaging of nerve root of the Lumber vertebra) is one of examination methods widely used. Either 2D or 3D scanning is selected depending on the patient lesions. There are so many tactics to perform MR myelography that is not suitably optimized. On the other hand, whole-body 3T MRI machines are now used world wide and many cerebrospinal data are reported, however, tactics to perform...
Diffusion-weighted imaging (DWI) of the human brain is well established with 1.5T MRI. DWI is now used also for other regions than the brain, and especially focused on prostate cancer detection as a promising tool. On the other hand, 1H-MR spectroscopy of the human prostate has been used also for detection and localization of prostate cancer. One disadvantage of 1.5T prostate spectroscopy is the use...
Susceptibility-weighted imaging (SWI) is a powerful technique to produce an image with a strong contrast of magnetic susceptibility in a high field. The technique is particularly useful in emphasizing blood vessels, for example, the vein and iron accumulated lesions in the brain. What can be found by applying the technique to the abdomen instead of the brain? We carried out a newly developed 2D breath-held...
Multi-slice 2D turbo spin echo (TSE) sequences are widely used for T2-weighted MR imaging of the liver. On the other hand, there is a demand for 3D imaging to enable the observation of thinner slices, though 3D TSE has often been associated with a high SAR (specific absorption rate) which is caused by repeated 180-degree refocusing pulses. The high SAR has been a limiting factor for 3D TSE, especially...
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