Magnetic Resonance Imaging (MRI) Practice Test

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Which technique is typically not employed to suppress signals from specific tissues in MRI?

  1. Fat suppression

  2. STIR sequence

  3. Gadolinium contrast

  4. Inversion recovery

The correct answer is: Gadolinium contrast

The technique not typically employed to suppress signals from specific tissues in MRI is the use of gadolinium contrast. Gadolinium is a paramagnetic contrast agent used to enhance the visibility of structures or abnormalities within the body, particularly in areas where the differentiation between tissues may be challenging. It increases the relaxation rates of nearby protons, thereby enhancing the signal from certain tissues rather than suppressing them. In contrast, the other techniques mentioned are specifically designed to suppress signals from certain tissues. Fat suppression is a method that reduces the signal from fat within MR images, allowing for better visualization of adjacent structures. The STIR (Short Tau Inversion Recovery) sequence is particularly effective in fat suppression and is often used in musculoskeletal imaging to nullify the fat signal. Inversion recovery is a broader technique that can be tailored to suppress signals from specific tissues, depending on the inversion time selected.