The time required for precessing spins to align with the constant external field to 63% of the maximum possible strength is A)spin density ($\rho$). B)repetition time (TR). C)echo time (TE). D)spin-lattice relaxation time (T₁).

Question

Quizplus · Accepted Answer

The time required for precessing spins to align with the constant external field to 63% of the maximum possible strength is governed by the spin-lattice relaxation time (T1). Option D represents T1, which is the correct answer. Option A refers to spin density, which is the number of spins per unit volume, and is not relevant to the question. Options B and C refer to the timing parameters in MRI, but do not relate to the time it takes for precessing spins to align with the external field.

The Time Required for Precessing Spins to Align with the Constant