Question 2 = a) If a material has a longitudinal relaxation time constant T1 = 150 msec, what will the MR signal S be 15

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Question 2 A If A Material Has A Longitudinal Relaxation Time Constant T1 150 Msec What Will The Mr Signal S Be 15 1 (119.86 KiB) Viewed 26 times

Question 2 = a) If a material has a longitudinal relaxation time constant T1 = 150 msec, what will the MR signal S be 150 ms after an RF pulse has flipped the bulk magnetization into the transverse plane? (2 marks) b) A sample of liver tissue has a longitudinal relaxation time constant T1 of 500 ms and a transverse relaxation time constant T2 of 40 ms. What will the MR signal be 40 ms after a 90° RF pulse? What will the MR signal be 500 ms after a 90° RF pulse? (4 marks) a a c) For a material having a T2 of 80 msec, 320 msec after a 90° pulse, what is the relative magnitude of the MR signal compared to the maximum signal? (2 marks)