![2.3.6 Example Images](/images/new-backgrounds/105581/10558129x1.webp)
Operation | 2 |
Tests with 3D Resolution and Slice (3DRAS) Phantom |
direction) is measured and related to the slice position. For a 45° ramp, the distance from a centered reference pin to the slice profile midpoint will be equal to the point of the ramps located at the isocenter.
All measurements should be made along the line made up of the magnet isocenter and the centers of the imaging planes.
Comparison of external position marker should generally agree with the actual slice position within +2
mm.Slice separation disagreement should typically be less than 20% of the total slice separation or whichever is greater.
2.3.6 Example Images
Figures
Figure
Figure
On the right and
It should also be noted that the gap between the slice thickness lines on the left side of the figure is larger than that on the right, indicating that the phantoms were not placed properly in the MRI system. In a proper setting the gaps should be identical on both sides.