Magnetic Resonance Imaging (MRI) Practice Test

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Study for the Magnetic Resonance Imaging (MRI) Test. Utilize flashcards and multiple choice questions with detailed hints and explanations. Get thoroughly prepared for your MRI exam!

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Why is water typically bright on T2 weighted images?

It has a short relaxation time
It has a high density
It has a long relaxation time
It absorbs more protons

The correct answer is: It has a long relaxation time

Water appears bright on T2-weighted images primarily due to its long relaxation time. In MRI, T2-weighted imaging emphasizes differences in the transverse relaxation time of various tissues, which is influenced by how quickly protons in the tissue lose their coherence after being disturbed by the radiofrequency pulse. Since water has a long T2 relaxation time, it takes a greater amount of time for the protons in water to lose coherence compared to other tissues, resulting in a stronger signal when imaged. This longer relaxation time allows water to retain its signal longer, contributing to the bright appearance on T2-weighted images. In contrast, tissues with shorter T2 relaxation times will decay more rapidly and appear darker on these images. This knowledge is crucial as it helps in differentiating between various tissue types, such as distinguishing edema or fluid-filled structures from solid tissues in diagnostics. The focus on how T2 properties impact signal strength makes the recognition of water's brightness on T2-weighted images an essential concept in MRI.