Magnetic Resonance Imaging (MRI) Practice Test

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Study for the Magnetic Resonance Imaging Test. Prepare with flashcards and multiple choice questions, each question has hints and explanations. Be exam-ready!

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If ETL is increased, what is the general impact on scan time?

Scan time increases
Scan time decreases
No effect on scan time
Scan time becomes variable

The correct answer is: Scan time decreases

Increasing the Echo Train Length (ETL) in MRI imaging typically results in a decrease in scan time. ETL refers to the number of echoes collected following a single excitation pulse. When ETL is increased, more data points are acquired within a single repetition time (TR), meaning that the machine can gather more information more quickly. This enhancement allows for a more efficient use of time during scanning, enabling images to be produced faster without compromising the overall quality, as long as other parameters are appropriately managed. It's important to consider that while increasing ETL can reduce scan times, this must be balanced with factors such as the potential for increased imaging artifacts and decreased signal-to-noise ratio. Therefore, understanding the optimal settings for ETL in relation to scan time is crucial for achieving high-quality imaging in MRI studies.