Rice and perfluorocarbon liquid pads: Comparison of fat suppression effects

Moriya, Susumu; Miki, Yukio; Yokobayashi, Tsuneo; Yamamoto, Akira; Kanagaki, Mitsunori; Komori, Yoshiaki; Ishikawa, Mitsunori

doi:10.3109/02841851003645744

Cited by 10 publications

(8 citation statements)

References 24 publications

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“…Several studies [7][8][9] report that the use of rice pads improved magneticˆeld inhomogeneity, which supports ourˆnding of reduced geometric distortion on EPI DWI, and the pads did this by improv-ing the fat suppression eŠect using CHESS. Thus, ndings of the previous reports and the results of our study represent 2 diŠerent phenomena-improved inhomogeneity of the fat suppression eŠect in CHESS and reduced geometric distortion in DWI using EPI.…”

Section: Discussionsupporting

confidence: 51%

“…[2][3][4] One way to lessen the eŠect of magnetic susceptibility is to place a material with magnetic susceptibility similar to that of the human body at the boundary of the air and human body, [5][6][7][8][9] and the usefulness of rice pads for this purpose has recently been reported. [7][8][9] Because their similar magnetic susceptibility to that of the human body can improve susceptibility eŠect, we hypothesized that rice pads could reduce the geometric distortion in DWI using EPI.…”

Section: Introductionmentioning

confidence: 99%

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Rice Pads Reduce Geometric Distortion of Echo-planar Diffusion-weighted Images of the Cervical Spinal Cord

Moriya

Miki

Yokobayashi

et al. 2011

MRMS

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We investigated whether a rice pad could be used to reduce the geometric distortion in echo-planar diŠusion-weighted images of the cervical spinal cord. In 10 healthy volunteers, we obtained sagittal plane images using the same imaging parameters with and without a rice pad. Two reviewers classiˆed geometric distortion and visually assessed images. Use of a rice pad signiˆcantly reduced geometric distortion in the cervical spinal cord.

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Section: Discussionsupporting

confidence: 51%

Section: Introductionmentioning

confidence: 99%

Rice Pads Reduce Geometric Distortion of Echo-planar Diffusion-weighted Images of the Cervical Spinal Cord

Moriya

Miki

Yokobayashi

et al. 2011

MRMS

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“…Reported methods to improve CHESS imaging in MR imaging have included the use of pads filled with perfluorocarbon liquid, 13 physiological saline, 14 and rice, [7][8][9][10] but the use of flour has not been reported. When we used flour, lingering fat signals in CHESS decreased in number in the phantom experiment and disappeared in the popliteal space in human subjects.…”

Section: Discussionmentioning

confidence: 99%

“…Investigations performed with this method in the neck, shoulder, elbow, wrist, and knee have yielded good fat suppression. [7][8][9][10] Rice is widely consumed in such places as Japan, China, India, and other Asian countries, 11 but we questioned whether an alternative material similarly easy to obtain in other countries might be used for such pads to improve CHESS images. We hypothesized that flour from wheat would be a candidate because its raw material, wheat, is consumed around the world, 12 and flour is a processed food product, more easily purchased than unthreshed wheat, and inexpensive.…”

Section: Introductionmentioning

confidence: 99%

Flour Pads: Devices to Improve CHESS Fat Suppression

et al. 2014

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Purpose: We compared the suppression of lingering fat signals in chemical shift selective (CHESS) images by pads filled with flour and pads filled with rice in a phantom and human subjects.Materials and Methods: First, we prepared a phantom by creating an empty space in a mass of lard and filling the space with air, rice, or flour. Then, we obtained MR images of the phantoms in the center of the magnetic field and at a position 8 cm to the left (off-center) to compare lingering fat signals. MR images of the knee were obtained in 10 healthy volunteers using CHESS after placing a polyurethane sponge pillow, rice pad, or flour pad in the popliteal space under the flexed knee. We visually assessed the number of areas with lingering fat signals and the statistical differences among the groups were assessed using Tukey's test.Results: Similarly to rice, flour clearly decreased lingering fat signals in the phantom study. A similar effect was obtained in the off-center images. In the volunteer study, the mean number of areas with lingering fat signals was 2.5 with a sponge pillow, 0.5 with the rice pad, and 0.3 with the flour pad. Those numbers were significantly different using flour pad and rice pad compared with sponge pillow (P < 0.001). No significant differences were seen between flour pads and rice pads (P = 0.662).Conclusion: Flour pads can suppress lingering fat signals in CHESS images.

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“…41 There are other successful materials in this regard: Moriya et al reported in 2010 that bags of dried rice performed better for improving fat suppression near air interfaces than did the perfluorocarbon liquid. 42 Active strategies Local control of B 0 distortion through strategically placed electrical coil loops To combat field distortion in the inferior frontal lobe resulting from air pockets in the sinuses and nasal cavity, Hsu and Glover reported in 2005 on the use of a set of three small coil loops that could operate intraorally. 43 This part of the brain is a frequent site of B 0 field distortion, which is particularly problematic for fMRI studies.…”

Section: Susceptibility Matchingmentioning

confidence: 99%

Evaluation of active and passive shimming in magnetic resonance imaging

Wachowicz¹

2014

RRNM

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With higher magnet strengths for magnetic resonance imaging (MRI) units becoming more commonplace, both for animal imaging systems as well as whole-body in vivo systems, magnetic field distortions due to inhomogeneous distributions of magnetic susceptibility and air-tissue interfaces will become more intense. Further, the popularization of MRI-hybrid devices, such as positron emission tomography/MR or MR/radiotherapy hybrids, which rely on the assumption of geometric accuracy for their diagnostic or therapeutic effectiveness, will lead to greater restrictions on permissible geometric error. As a result, shimming procedures (methods by which the distortions induced on the main magnetic field, B 0 , are remedied) are requiring greater flexibility and corrective range. Shimming methods can be broadly classified into passive (using materials with magnetic properties to remedy field distortions through their passive response to B 0 ) and active techniques (utilizing strategically placed and energized electric coils to produce corrective magnetic fields). Both these techniques have promise to address the additional challenges brought about by the changing MRI landscape. This work reviews traditional shimming methods and principles, and gives an overview of new and novel approaches to this ever-important issue in MRI.

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Rice and perfluorocarbon liquid pads: Comparison of fat suppression effects

Abstract: The rice pad exhibited better performance in improving the fat suppression effect. Thus, the rice pad is a superior product that is inexpensive and simple to use.

Cited by 10 publications

References 24 publications

Rice Pads Reduce Geometric Distortion of Echo-planar Diffusion-weighted Images of the Cervical Spinal Cord

Rice Pads Reduce Geometric Distortion of Echo-planar Diffusion-weighted Images of the Cervical Spinal Cord

Flour Pads: Devices to Improve CHESS Fat Suppression

Evaluation of active and passive shimming in magnetic resonance imaging

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