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

Questions

PART B. LONG ANSWER. Shоw ALL yоur wоrk. Pаrtiаl mаrks 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)

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