Question:
In MRI, the terms T1 and T2 time constants are crucial for obtaining suitable weighted images. Choose the correct explanation.
In MRI, the terms T1 and T2 time constants are crucial for obtaining suitable weighted images. Choose the correct explanation.
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T1 → longitudinal recovery.
T2 → transverse decay.
T2 → transverse decay.
Updated On: Dec 4, 2025
- T1 is the spin-lattice or longitudinal relaxation time, and T2 is the spin-spin or transverse relaxation time
- T1 and T2 indicate durations of FID signals in x and y directions
- T1 and T2 refer to flipping pulse durations
- T1 is transverse relaxation time, and T2 is longitudinal relaxation time
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The Correct Option is A
Solution and Explanation
Step 1: Understanding T1 Relaxation
T1 relaxation is the recovery of longitudinal magnetization along the main magnetic field. It involves energy transfer between nuclei and the surrounding lattice (spin-lattice relaxation).
Step 2: Understanding T2 Relaxation
T2 relaxation represents the decay of transverse magnetization as spins lose phase coherence. This is due to interactions among spins, hence called spin-spin relaxation.
Step 3: Eliminating Wrong Options
- T1 and T2 are not FID durations nor RF pulse durations.
- Option (D) reverses the definitions.
Thus, option (A) is the only correct statement.
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