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What does increased NEX primarily affect in an MRI scan?

Scan time

In an MRI scan, increasing the number of excitations (NEX) primarily affects scan time. NEX refers to the number of times the same slice of tissue is sampled to improve the Signal-to-Noise Ratio (SNR) of the acquired images. By acquiring more data points from the same slice, the scan takes longer, as it requires multiple repetitions of the imaging sequence.

This repetition helps enhance the quality of the final image, resulting in clearer visualization of anatomical details. While increasing NEX can contribute to better SNR and overall image quality, it does so at the expense of longer examination times, making it a crucial consideration in balancing image quality with patient throughput.

Other factors, such as image contrast and spatial resolution, are influenced by different parameters like the choice of pulse sequences, the magnetic field strength, or values like matrix size and voxel dimensions, rather than simply increasing NEX.

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Image contrast

Spatial resolution

Magnetic field strength

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