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!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

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What is the general effect of increasing TR on SNR?

It does not affect SNR
It decreases SNR
It increases SNR
It yields inconsistent outcomes

The correct answer is: It increases SNR

Increasing the repetition time (TR) in an MRI sequence generally leads to an increase in the signal-to-noise ratio (SNR). This occurs because a longer TR allows more time for the longitudinal magnetization of the tissue to recover before the next excitation pulse is applied. When the TR is increased, tissues have more time to regain their magnetization after being excited, which results in a stronger signal being detected during the next readout. A higher SNR is desirable in MRI because it enhances image quality, making it easier to differentiate between normal and abnormal tissue. In summary, a longer TR typically results in greater SNR due to the improved recovery of magnetization, thereby enhancing the quality of the images produced.