This animation shows the difference between the fixed and the rotating frame of reference. The animation shows a net magnetic vector (purple arrow) as it precesses in an external magnetic field (transparent arrow). In addition to the precessional motion, the vector is also being tipped 90° into the transverse plane and allowed to recover. In the view shown on the right, you are a stationary (fixed) observer looking in on the system. The vector appears to spiral down to the rotating blue platform and then spiral back upwards as it recovers. There is also a video camera mounted on the platform as it turns. The camera has a different frame of reference to you, because it is rotating at the same speed as the platform. This is what is known as the rotating frame of reference. The camera is taking a video and the view shown on the right displays what the camera can see. The vector no longer appears to spiral up and down. Instead, it simply tips into the transverse plane and then recover.
Animation 1.1 Rotating and Fixed Frame of Reference
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Animation 1.2 (NMV and Coil)
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Animation 1.3 (NMV Coil and Oscilloscope)
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Animation 2.1 (T1 vs T2)
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Animation 2.2 (Diffusion)
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Animation 3.1 (The 180° RF Pulse)
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Animation 3.2 (The Larmor Grand Prix)
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Animation 3.3 Inversion Recovery
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Animation 6.1 (Slices Chest of Drawers)
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Animation 6.2. (Sampling Frequencies)
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Animation 6.3 (Filling Methods)
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Animation 8.1 (In and Out of Phase)
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Animation 8.2 (Entry-slice Phenomenon)
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Animation 8.3 Time of Flight
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Animation 8.4 (Gradient Moment Nulling)
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Animation 9.1 (Closed and Open Systems)
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Animation 9.2 (Active Shielding)
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Animation 9.3 (NMV Coil and Scanner Loop)
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