Abstract #1877

Improvement of the Reproducibility of Parallel Transmission at 7T by Breath-Holding During the Calibration Scan

Taisuke Harada^1,2, Kohsuke Kudo¹, Ikuko Uwano³, Fumio Yamashita³, Hiroyuki Kameda^1,3, Tsuyoshi Matuda⁴, Makoto Sasaki³, and Hiroki Shirato²

¹Department of Diagnostic and Interventional Radiology, Hokkaido University Hospital, Sapporo, Japan, ²Department of Radiation Medicine, Hokkaido University Graduate School of Medicine, Sapporo, Japan, ³Division of Ultrahigh Field MRI, Institute for Biomedical Sciences, Iwate Medical University, Yahaba, Japan, ⁴MR Applications and Workflow, GE Healthcare, Tokyo, Japan

The aim of our study was to compare the reproducibility of those maps and GRASS images of brain scanned with pTx at 7T between free-breathing (FB) and breath-holding (BH) during the calibration scan. Nine healthy volunteers were scanned by 7T MRI with RF shimming, RF design of pTx, and quadrature transmission (qTx). The reproducibility of B0 and B1+ were better in BH than FB, and the same results was seen in GRASS images. The intensity homogeneity was not different between qTx and RF shimming however was better in RF design than qTx. These results might facilitate the development of pTx.

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