Magnetic Resonance Imaging (MRI) Practice Test

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In a FSE sequence acquiring T1 or PD weighted images with a short TE, how can blurring be minimized?

Using a longer ETL
Using a shorter ETL
Increasing the TE
Utilizing fat suppression

The correct answer is: Using a shorter ETL

In a Fast Spin Echo (FSE) sequence, minimizing blurring in T1 or Proton Density (PD) weighted images with a short Echo Time (TE) can effectively be achieved by using a shorter Echo Train Length (ETL). A shorter ETL reduces the number of echoes collected within a single repetition time (TR). This means that each echo is acquired with higher resolution, resulting in improved spatial fidelity and reduced blurring. When a longer ETL is used, more echoes are acquired during a single TR, which can introduce motion artifacts or compounding effects that lead to blurriness in the image. Hence, for optimal imaging quality in T1 and PD weighted sequences, selecting a shorter ETL is critical, as it ensures that each echo contributes to the image more clearly and distinctly. Increasing the TE or utilizing fat suppression does not directly relate to the minimization of blurring in the context of acquiring T1 or PD weighted images; these techniques serve different purposes, such as improving tissue contrast or reducing fat signal.