高速スピンエコー画像の空間分解能評価 : echo train lentghとinterecho spacingによる影響

概要

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Fast spin echo(FSE)imaging technique has been indispensable in clinical MRI. This technique reduced acquisition time compared with conventional spin echo sequences. However, this technique introduces new factors, such as echo train lentgh(ETL)and interecho spacing and is susceptible to a new set of artifacts, such as image blurring secondary to nonuniform sampling K-space. Therefore, the effects of spatial resolution of FSE images on echo train lengh and interecho spacing were measured using the final MTF. FSE images of the chart phantom with some ETLs and bandwidth were exposed on laser films and measured by micro-densitometer in the phase-encoding direction. Using the final MTF method, the FSE images were evaluated for spatial resolution. Increasing ETL reduced spatial resolution on FSE images. The proton-density-weighted images were more conspicuous. Decreasing the bandwidth reduced spatial resolution on FSE images because of increasing interecho spacing.
1997-05-20