PART B. LONG ANSWER. Show ALL your work. Partial marks award…

PART B. LONG ANSWER. Show ALL your work. Partial marks awarded. State answers to the correct number of significant digits. In a particular pulse sequence, a 1.0 T MR imager utilizes a flip angle of 30.0º, a TR of 270 ms, and a TE of 16.0 ms. Spleen tissue has the following parameters: Proton Density 0.90, T1 = 480 ms, T2 = 80.0 ms. (Assume all the given values have three significant digits) a) Find the value of the longitudinal and transverse magnetizations immediately after the first RF pulse in the sequence for spleen tissue. (2 marks) b) Calculate the value of the longitudinal magnetization after a time equal to the repetition time (TR) has elapsed relative to the 1st RF pulse for spleen tissue. (3 marks) c)    A 2nd RF pulse is now transmitted at this time.   Determine the value of the longitudinal and transverse magnetization for spleen tissue immediately after the 2nd RF pulse. (2 marks) d)    Determine the amplitude of the echo received at time TE after the 2nd RF pulse. (2 marks)

Nucleus A has a gyromagnetic ratio γA\gamma_A​ that is half…

Nucleus A has a gyromagnetic ratio γA\gamma_A​ that is half the gyromagnetic ratio γB\gamma_B​ of nucleus B (i.e., γA=12γB\gamma_A = \frac{1}{2} \gamma_B​). Both nuclei are placed in the same static magnetic field of 1.5 T. Which of the following statements about their precessional frequencies fAf_A and fBf_B is TRUE?

Reread Book VIII Sections 11. 25-27 and describe how Augusti…

Reread Book VIII Sections 11. 25-27 and describe how Augustine explains his personal convictions about his sexual impurity and lack of self-control. Who is it that reminds Augustine that countless men and women have also dealt with the same sins and overcame them by coming to God? What does this woman tell him to do about his sins?