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← ScienceWhich outcome affects a MRI after prolonged cryogen quenches?
A)Quench-induced persistent current decay✓
B)Compensating gradient field stabilizes
C)Increased accuracy field shimming
D)Increased transverse relaxation efficiency
💡 Explanation
Persistent current decay results because the rapid loss of cryogen leads to heat generation exceeding coil’s conductive cooling capacity; this thermal rise disrupts magnetic flux pinning via flux creep, therefore reduced field strength occurs rather than stabilization, and shimming accuracy is unaffected.
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