Positive Visualization of Implanted Devices With Susceptibility Gradient Mapping Using the Original Resolution

Gopal Varma; Rachel Clough; Peter Acher; Julien Senegas; Hannes Dahnke; Stephen F. Keevil; Tobias Schaeffter

doi:10.1002/mrm.22710

Positive Visualization of Implanted Devices With Susceptibility Gradient Mapping Using the Original Resolution

Gopal Varma, Rachel Clough, Peter Acher, Julien Senegas, Hannes Dahnke, Stephen F. Keevil, Tobias Schaeffter

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

19 Citations (Scopus)

Abstract

In magnetic resonance imaging, implantable devices are usually visualized with a negative contrast. Recently, positive contrast techniques have been proposed, such as susceptibility gradient mapping (SGM). However, SGM reduces the spatial resolution making positive visualization of small structures difficult. Hers, a development of SGM using the original resolution (SUMO) is presented. For this, a filter is applied in k-space and the signal amplitude is analyzed in the image domain to determine quantitatively the susceptibility gradient for each pixel. It is shown in simulations and experiments that SUMO results in a better visualization of small structures in comparison to SGM. SUMO is applied to patient datasets for visualization of stent and Prostate brachytherapy seeds. In addition, SUMO also provides quantitative information about the number of prostate brachytherapy seeds. The method might be extended to application for visualization of other interventional devices, and, like SGM, it might also be used to visualize magnetically labelled cells. Magn Reson Med 65:1483-1490, 2011. (C) 2010 Wiley-Liss, Inc.

Original language	English
Pages (from-to)	1483 - 1490
Number of pages	8
Journal	Magnetic Resonance in Medicine
Volume	65
Issue number	5
Early online date	16 Dec 2010
DOIs	https://doi.org/10.1002/mrm.22710
Publication status	Published - May 2011

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title = "Positive Visualization of Implanted Devices With Susceptibility Gradient Mapping Using the Original Resolution",

abstract = "In magnetic resonance imaging, implantable devices are usually visualized with a negative contrast. Recently, positive contrast techniques have been proposed, such as susceptibility gradient mapping (SGM). However, SGM reduces the spatial resolution making positive visualization of small structures difficult. Hers, a development of SGM using the original resolution (SUMO) is presented. For this, a filter is applied in k-space and the signal amplitude is analyzed in the image domain to determine quantitatively the susceptibility gradient for each pixel. It is shown in simulations and experiments that SUMO results in a better visualization of small structures in comparison to SGM. SUMO is applied to patient datasets for visualization of stent and Prostate brachytherapy seeds. In addition, SUMO also provides quantitative information about the number of prostate brachytherapy seeds. The method might be extended to application for visualization of other interventional devices, and, like SGM, it might also be used to visualize magnetically labelled cells. Magn Reson Med 65:1483-1490, 2011. (C) 2010 Wiley-Liss, Inc.",

author = "Gopal Varma and Rachel Clough and Peter Acher and Julien Senegas and Hannes Dahnke and Keevil, {Stephen F.} and Tobias Schaeffter",

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T1 - Positive Visualization of Implanted Devices With Susceptibility Gradient Mapping Using the Original Resolution

AU - Varma, Gopal

AU - Clough, Rachel

AU - Acher, Peter

AU - Senegas, Julien

AU - Dahnke, Hannes

AU - Keevil, Stephen F.

AU - Schaeffter, Tobias

PY - 2011/5

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N2 - In magnetic resonance imaging, implantable devices are usually visualized with a negative contrast. Recently, positive contrast techniques have been proposed, such as susceptibility gradient mapping (SGM). However, SGM reduces the spatial resolution making positive visualization of small structures difficult. Hers, a development of SGM using the original resolution (SUMO) is presented. For this, a filter is applied in k-space and the signal amplitude is analyzed in the image domain to determine quantitatively the susceptibility gradient for each pixel. It is shown in simulations and experiments that SUMO results in a better visualization of small structures in comparison to SGM. SUMO is applied to patient datasets for visualization of stent and Prostate brachytherapy seeds. In addition, SUMO also provides quantitative information about the number of prostate brachytherapy seeds. The method might be extended to application for visualization of other interventional devices, and, like SGM, it might also be used to visualize magnetically labelled cells. Magn Reson Med 65:1483-1490, 2011. (C) 2010 Wiley-Liss, Inc.

AB - In magnetic resonance imaging, implantable devices are usually visualized with a negative contrast. Recently, positive contrast techniques have been proposed, such as susceptibility gradient mapping (SGM). However, SGM reduces the spatial resolution making positive visualization of small structures difficult. Hers, a development of SGM using the original resolution (SUMO) is presented. For this, a filter is applied in k-space and the signal amplitude is analyzed in the image domain to determine quantitatively the susceptibility gradient for each pixel. It is shown in simulations and experiments that SUMO results in a better visualization of small structures in comparison to SGM. SUMO is applied to patient datasets for visualization of stent and Prostate brachytherapy seeds. In addition, SUMO also provides quantitative information about the number of prostate brachytherapy seeds. The method might be extended to application for visualization of other interventional devices, and, like SGM, it might also be used to visualize magnetically labelled cells. Magn Reson Med 65:1483-1490, 2011. (C) 2010 Wiley-Liss, Inc.

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Positive Visualization of Implanted Devices With Susceptibility Gradient Mapping Using the Original Resolution

Abstract

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