General
- Fat suppression
- A T2 based sq
- Also used in T1+C images to improve contrast of lesions surrounded by fat (orbital lesions)
Process
- Inversion Pulse
- A 180° radiofrequency pulse is applied to invert the magnetization of the protons in the fat tissue.
- Inversion Time (TI)
- After the inversion pulse, there is a delay known as the inversion time. During this time, the protons in fat recover their longitudinal magnetization.
- The key feature of STIR is that the inversion time is set to nullify the signal from fat, making it appear dark on the resulting images.
- This enhances the contrast between fat and other tissues, making fluid-filled regions, edema, and inflammation stand out more prominently.
- Excitation Pulse
- A 90° radiofrequency pulse is then applied to excite the protons.
- Signal Measurement
- The MRI scanner measures the resulting signal.
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