Explain whether each of the following statements is true or false with one/two s

Question

Explain whether each of the following statements is true or false with one/two sentences of explanation. (a) Protons processing at a faster frequency relax back to equilibrium faster and so have a shorter T_1 relaxation time. (b) A higher strength of the RF field from the RF coil means that the duration of the 90 degree pulse decreases. (c) A longer T_1 relaxation time means that the voltage induced in the RF coil lasts longer and so a larger MRI signal is achieved. (d) One line of k-space data acquired for each value of the phase encoding gradient corresponds to one line of the image. (e) All other parameters being equal, a longer RF pulse in a spin-echo imaging sequence results in a lower signal-to-noise. (f) At very high magnetic fields the Ti values of all tissues approach the same value.

Explanation / Answer

a) Ans: TRUE

we know that T is directly inversely proportional to f   Protons processing at a higher frequency relax back to equilibrium faster

b) Ans: TRUE

Here B1 is inversely proportional to Tp

c) Ans: FALSE

In this, we know that with such a low-frequency strength of MRI signal is reduced and hence larger MRI is not achieved

d) Ans: TRUE

One line of k-space data acquired for each value of the phase encoding

Related Questions

Navigate

• Browse (All)
• Browse E
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.