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The LSAs are located in the central “bright spot” of the B1+ field due to standing wave shading artifacts (dielectric effects, red arrow) at 7T, which is favorable for enhancing the CNR of LSAs but problematic for evaluating larger vessels at the base of the brain or perforating arteries in the parenchyma. With the use of pTx B1 shimming, the dielectric effects toward the base of the brain are reduced, improving overall SNR and enabling concurrent vessel wall assessment.
