Fast B1 mapping based on double-angle method with T1 correction using standard pulse sequence

Yoshiyuki Ishimori, Takeshi Shimanuki, Tomoya Kobayashi, Masahiko Monma

Research output: Contribution to journalArticlepeer-review


Radiofrequency (RF) field (B1) mapping by combining the double-angle method (DAM) and T1 correction was investigated. The signal intensities S1 and S2 acquired by flip angle (FA) - and double FA 2- at short repetition time (TR) were converted to a signal intensity at TR=∞ by T1 correction. Then, these were used for DAM calculation. The T1 values are measured from two different images acquired with different TRs based on the saturation recovery (SR) method preliminarily. The effects of imaging parameters for T1 estimation and measured FA were investigated using CuSO 4 -doped water phantoms. A two-dimensional gradient echo type echo planar imaging pulse sequence was used. T1 values obtained by the 2-SR method were underestimated compared to the multipoint inversion recovery method. FA error was less than 5% when the appropriate imaging parameters were used. The acquisition time could be shortened to under 25 s by the use of T1-corrected DAM.

Original languageEnglish
Pages (from-to)93-98
Number of pages6
JournalJournal of Medical Physics
Issue number1
Publication statusPublished - 2022 Jan 1
Externally publishedYes


  • B1 map
  • T1 correction
  • double-angle method
  • flip angle
  • radio frequency

ASJC Scopus subject areas

  • Biophysics
  • Radiology Nuclear Medicine and imaging


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