Journal of Medical Physics
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TECHNICAL NOTE
Year : 2022  |  Volume : 47  |  Issue : 1  |  Page : 93-98

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


1 Department of Radiological Sciences, Ibaraki Prefectural University of Health Sciences, Kashiwa, Japan
2 Department of Radiology, The Jikei University Kashiwa Hospital, Kashiwa, Japan

Correspondence Address:
Dr. Yoshiyuki Ishimori
4669-2 Ami, Ami-Machi, Inashiki-Gun, Ibaraki 300-0394
Japan
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/jmp.jmp_78_21

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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) α and double FA 2α 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 CuSO4-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.


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