Figure 3b. Effect of hardware orientation on metal-related artifacts at fast SE MR imaging. (a) Schematics demonstrate the orientation of a screw in the vertical position (0°) and at successive angles of 30°, 60°, and 90°. (b) Coronal T1-weighted fast SE images (500/17; echo train length, three), obtained in the phantom with sequential changes in the angular orientation of the screw (as specified in a), show increases in artifact size that are proportional to the increase in the angle between the long axis of the screw and the direction of the main magnetic field.