• Object ID: 00000018WIA3094A870GYZ
  • Topic ID: id_40023355 Version: 1.1
  • Date: Feb 28, 2022 11:24:56 AM

Spin Echo flip angle

About this task

Select a Flip Angle for the desired image contrast weight and SNR for a Spin Echo pulse sequence.

Step-by-step instructions

  1. Scan selections: 2D Mode, Spin Echo family, Spin Echo pulse.
  2. At the bottom of the expanded Imaging Options/PSD screen, type t1memp In the PSD Name text box.
  3. From the TR menu, select a TR value.
  4. From the Flip Angle menu, select Auto.
    • The system automatically sets the Flip Angle from the TR value to provide optimal T1 image contrast.

    The following graph illustrates different flip angles correlated to different TR values.

    Note: that the optimum contrast with a varied flip angle is the same curve. Curves 4 and 6 illustrate that the lower the TR the higher the flip angle.
    Figure 1. Flip angle and TR
    Table 1. Table legend
    NumberDescription
    1Flip angle in degrees.
    2TR (repetition time) in ms.
    3Ernst angle to achieve highest signal for white matter.
    4Flip angle for t1memp PSD.
    5Spin Echo flip angle.
    6The optimum flip angle to achieve the best signal difference between gray and white matter.