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A comparison of shimming techniques for optimizing fat suppression in MR mammography

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Abstract

We evaluated the degree of inhomogeneities of fat suppression using the fully automated three-dimensional breast shimming technique (Image Based-Smart: IB-Smart) and manual setting of a rectangular parallelepiped shim (volume shimming) in MR mammography. Information on breast shape was collected from 9 patients whose images were insufficiently fat-suppressed. A breast phantom made of a thermoplastic sheet was used. Shimming of the magnetic field was done with IB-Smart and various dimensions of volume shims: the anterior to posterior/right to left/head to foot directions were set to 75–150/150–350/50–150 mm. The volumes of inhomogeneously suppressed fat were measured. The calculated volume with inhomogeneous fat suppression with use of IB-Smart was 13.3 × 104 mm3. The smallest volume of inhomogeneous fat suppression with volume shimming was 5.4 × 104 mm3 when the anterior–posterior/right–left/head–foot directions were set to 75/350/50 mm. Our results show that using optimized dimensions of volume shims enables better fat suppression than does IB-Smart.

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Acknowledgments

The author would like to thank Yoshinori Hirose and Tsuneyuki Tomita from the radiotherapy division of the department of radiology at the Osaka Red Cross Hospital for the construction of the phantom.

Conflict of interest

The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. Department of Radiology, Osaka Red Cross Hospital, 5-30 Fudegasaki, Tennouji-ku, Osaka, 543-8555, Japan

    Yasuo Takatsu & Kengo Nishiyama

  2. Division of Health Sciences, Graduate School of Medical Sciences, Kanazawa University, 5-11-80 Kodatsuno, Kanazawa, 920-0942, Japan

    Yasuo Takatsu & Tosiaki Miyati

  3. Department of Radiology, Toyonaka Municipal Hospital, 4-14-1 Shibahara-cho, Toyonaka, Osaka, 560-8565, Japan

    Hideto Miyano

  4. Department of Radiology, Kyoto City Hospital, 1-2 Takada-cho Mibuhigashi, Nakagyo-ku, Kyoto, 604-8845, Japan

    Mariko Kajihara

  5. Department of Radiology, Kishiwada City Hospital, 1001 Gakuhara-cho, Kishiwada, Osaka, 596-0822, Japan

    Thai Akasaka

Authors
  1. Yasuo Takatsu
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  2. Kengo Nishiyama
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  3. Tosiaki Miyati
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  4. Hideto Miyano
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  5. Mariko Kajihara
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  6. Thai Akasaka
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Corresponding author

Correspondence to Yasuo Takatsu.

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Takatsu, Y., Nishiyama, K., Miyati, T. et al. A comparison of shimming techniques for optimizing fat suppression in MR mammography. Radiol Phys Technol 6, 486–491 (2013). https://doi.org/10.1007/s12194-013-0224-3

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  • DOI: https://doi.org/10.1007/s12194-013-0224-3

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