Improving B1+$$ {B}_1^{+} $$‐inhomogeneity tolerance by resolving non‐bijection in <scp> MP2RAGE <i>R</i> ₁ </scp> mapping: A <scp>2D</scp> look‐up table approach demonstrated at <scp>3 T</scp>

We show that it is possible to optimize for <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:semantics> <mml:mrow><mml:msubsup><mml:mi>B</mml:mi> <mml:mn>1</mml:mn> <mml:mo>+</mml:mo></mml:msubsup> </mml:mrow> <mml:annotation>$$ {B}_1^{+} $$</mml:annotation></mml:semantics> </mml:math> -inhomogeneity tolerance in MP2RAGE through sequence-parameter settings, while still successfully estimating the R₁ map with a two-dimensional look-up table approach. This without the need for an additional <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:semantics> <mml:mrow><mml:msubsup><mml:mi>B</mml:mi> <mml:mn>1</mml:mn> <mml:mo>+</mml:mo></mml:msubsup> </mml:mrow> <mml:annotation>$$ {B}_1^{+} $$</mml:annotation></mml:semantics> </mml:math> map. The increased parameter space enabled by the two-dimensional look-up table approach may further be used to adjust MP2RAGE acquisitions for improved scan times, signal-to-noise ratio, and/or contrast-to-noise ratio.