Recent remarkable progress of fast imaging techniques in 3D MRI has emphasized the importance of evaluation of its resolution characteristics. A trial point spread function (PSF) measurement was conducted using the ramp method, a conventional measurement method for the slice profile of 2D imaging, as an approach to evaluate the resolution characteristics of 3D imaging. However, problems peculiar to 3D imaging have arisen, such as artifacts and offsets in the slice selective direction. Therefore, we attempted PSF measurement using a phantom having a single-plate construction with only a simple ramp part (Single Plate Thin-Ramp Method) to respond to these shortcomings. By employing appropriate positioning and simple post processing, we obtained a PSF easily in both phase encoding and slice selective directions without the artifacts and offsets described above. Furthermore, it was possible to evaluate the change of resolution characteristics depending on the scan condition in three-dimensional MR image.
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