I am conducting simulations for ETL>1 FSE sequences and have validated them on a self-built MRI system. When using thicker slice thicknesses, the experimental results align well with simulations; however, with thinner slices, simulations still yield normal results while actual testing shows black stripes in the output.
The figure below shows a cross-sectional view of a water-filled test tube with a slice thickness of 0.5 mm, ETL=5, TE=15 ms, and TEeff=45 ms. As seen in the image, black stripes appear in the originally homogeneous circular foreground.
Due to the very small bore size of my system, high gradient strength and slew rates can be achieved, enabling slice selection at 0.5 mm thickness. In this case, reducing the ETL to 1 or enlarge slice thickness to 2mm would resolve the issue .
Therefore, I aim to verify whether this artifact is caused by eddy currents. I am unsure how to account for eddy current effects in pypulseq.
I am conducting simulations for ETL>1 FSE sequences and have validated them on a self-built MRI system. When using thicker slice thicknesses, the experimental results align well with simulations; however, with thinner slices, simulations still yield normal results while actual testing shows black stripes in the output.
The figure below shows a cross-sectional view of a water-filled test tube with a slice thickness of 0.5 mm, ETL=5, TE=15 ms, and TEeff=45 ms. As seen in the image, black stripes appear in the originally homogeneous circular foreground.
Due to the very small bore size of my system, high gradient strength and slew rates can be achieved, enabling slice selection at 0.5 mm thickness. In this case, reducing the ETL to 1 or enlarge slice thickness to 2mm would resolve the issue .
Therefore, I aim to verify whether this artifact is caused by eddy currents. I am unsure how to account for eddy current effects in pypulseq.