• Object ID: 00000018WIA30AB5970GYZ
  • Topic ID: id_40023465 Version: 1.4
  • Date: May 12, 2022 11:36:07 PM

Select RSP variables in Manual Prescan for water suppression

About this task

RSP variables are variables within the pulse sequences that can be modified while a sequence is acquiring data. There are three RSP variables that can be used to optimize or modify the water suppression portion of the spectroscopy pulse sequences. The RSP variables, f01, f02, and f03, correspond to the flip angles (powers) of the first, second, and third water suppression RF pulses, respectively. It is possible to modify these variables to optimize water suppression on the Spectroscopy screen.

Experience has shown that water suppression is best optimized by adjusting the value of the third RSP variable (f03). To optimize water suppression using the f03 RSP variable use the following procedure.

Step-by-step instructions

  1. Click Auto Prescan to optimize the acquisition parameters.
  2. Click Spectro Prescan to invoke the Spectroscopy screen and click Start with single1 as the active entry point.
  3. Select Options > Display RSPs.
  4. In the RSP Name text box, type f03. Then type a numerical value for the variable. The flip angle is entered in tenths of a degree, i.e., 90º is entered as 900.
    Water suppression can be turned off by setting all three variables to zero. However, the RF amplifier is still unblanked – the RF pulses are transmitted, but with no (0) power.