Magnetic Resonance Imaging (MRI) Practice Test

What technique is used for CSF suppression in MRI?

1. SE

2. FLAIR

3. DWI

4. GRE

The correct answer is: FLAIR

The technique used for CSF (cerebrospinal fluid) suppression in MRI is FLAIR (Fluid-Attenuated Inversion Recovery). FLAIR is specifically designed to suppress the signal from fluids, such as cerebrospinal fluid, which can enhance the visibility of other structures and abnormalities in the brain. This is particularly useful in identifying lesions or conditions that might be obscured by the bright signal of CSF in standard MRI sequences. In FLAIR, an inversion recovery pulse sequence is used to nullify the signal from the fluid, allowing pathologies in the surrounding tissues to be more clearly delineated. This technique is helpful in various clinical scenarios, such as evaluating multiple sclerosis lesions, assessing stroke, and identifying other brain abnormalities. The other techniques listed serve different purposes: SE (Spin Echo) is primarily used for producing standard images without any specific suppression, DWI (Diffusion Weighted Imaging) focuses on the movement of water molecules within tissues, and GRE (Gradient Echo) sequences provide images in a way that is sensitive to different types of tissue contrast but do not specifically suppress CSF signals.