[automatically translated] EDUCATIONAL OBJECTIVES: Describe the physical principles underlying the IDEAL sequence paragonarne utility than traditional fat suppression sequences in reducing artifacts in magnetic carriers of metal prostheses patients. INTRODUCTION: Magnetic resonance imaging (MRI) plays a vital role in post-operative imaging of patients with metal implants. However, both the magnetic susceptibility artifacts than those from field inhomogeneity pose a serious problem in assessing these patients; Moreover, the incomplete saturation of the fat signal is a further obstacle. To resolve these drawbacks is a new sequence of MR imaging said IDEAL been introduced, which determines a uniform separation of the adipose tissue and water in a single acquisition with multiple contrasts. DESCRIPTION: The IDEAL sequence uses 3 independent echoes, each to the maximum point of excitement, to achieve a high signal-to-noise ratio. In fact, selecting the images in-phase and out-phase, actually not completely in-phase and out-phase (asymmetric echoes), you reach a correct assessment of the amount of fat and water in each voxel, thus obtaining an image less noisy. The result is to get four co-registered images that can be used in combination to increase diagnostic confidence: - Off - Out of phase - Fat - Water Even in the case of complex anatomies or in the presence of metal implants, the IDEAL sequence is able to produce reliable images of water alone, but also providing important information related to adipose tissue. The IDEAL sequence has proven to be particularly useful in these situations by reducing the effects of inhomogeneity of the magnetic field and determining a homogeneous saturation of the fat signal until the edge of the metal structures, thus guaranteeing excellent image quality. CONCLUSIONS: The IDEAL sequence determines an actual reduction in ferro-magnetic artifacts and enhances image quality than traditional sequence saturation of the fat signal.
|Number of pages||2|
|Publication status||Published - 2011|