Magnetic Resonance Imaging (MRI) Practice Test

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What would likely happen if the TE is decreased too much?

  1. Increase T1 weighted images

  2. Lower SNR

  3. Alter the chemical shift

  4. Decrease T2 information

The correct answer is: Decrease T2 information

Decreasing the echo time (TE) too much primarily affects T2-weighted imaging. T2-weighted images utilize longer TE values to allow for the full decay of T2 signal, which reflects the differences in relaxation times of various tissues. If the TE is reduced significantly, there is less time for T2 relaxation to occur before the echo is measured. As a result, the differences between tissues based on their T2 relaxation characteristics become less pronounced, leading to a reduction in the quality and quantity of T2 contrast in the images. This decrease in T2 information can result in images that do not effectively highlight the pathology or tissue differences that are typically assessed in T2-weighted sequences. Therefore, a very low TE compromises the intent of obtaining T2-weighted images, diminishing their diagnostic utility.

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