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

Yasuo Takatsu; Kengo Nishiyama; Tosiaki Miyati; Hideto Miyano; Mariko Kajihara; Thai Akasaka

doi:10.1007/s12194-013-0224-3

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

Yasuo Takatsu, Kengo Nishiyama, Tosiaki Miyati, Hideto Miyano, Mariko Kajihara, Thai Akasaka

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

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 × 10 ⁴ 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.

Original language	English
Pages (from-to)	486-491
Number of pages	6
Journal	Radiological Physics and Technology
Volume	6
Issue number	2
DOIs	https://doi.org/10.1007/s12194-013-0224-3
Publication status	Published - 07-2013
Externally published	Yes

All Science Journal Classification (ASJC) codes

Radiation
Physical Therapy, Sports Therapy and Rehabilitation
Radiology Nuclear Medicine and imaging

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10.1007/s12194-013-0224-3

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title = "A comparison of shimming techniques for optimizing fat suppression in MR mammography",

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 × 10 4 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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AU - Takatsu, Yasuo

AU - Nishiyama, Kengo

AU - Miyati, Tosiaki

AU - Miyano, Hideto

AU - Kajihara, Mariko

AU - Akasaka, Thai

PY - 2013/7

Y1 - 2013/7

N2 - 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 × 10 4 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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A comparison of shimming techniques for optimizing fat suppression in MR mammography

Abstract

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