Fat and water magnetic resonance imaging

Bley, Thorsten Alexander; Wieben, Oliver; François, Christopher J.; Brittain, Jean H.; Reeder, Scott B.

doi:10.1002/jmri.21895

Cited by 321 publications

(306 citation statements)

References 68 publications

Supporting

Mentioning

296

Contrasting

Unclassified

Order By: Relevance

“…Our results show that hydrogen content can be calibrated on an MRI and additional pulse sequences can be used to separate out water from other organic molecules (Bernard et al, 2008;Bley et al, 2010), the two components necessary for UC model computation in soft…”

Section: Discussionmentioning

confidence: 92%

Determination of mean ionization potential using magnetic resonance imaging for the reduction of proton beam range uncertainties: theory and application

Sudhyadhom¹

2017

Phys. Med. Biol.

View full text Add to dashboard Cite

Accurate determination of mean ionization potential (Im) has the potential to reduce range uncertainty based margins and therefore allow for more focal treatments in proton radiotherapy. Many methods have been proposed to reduce uncertainty in Im and stopping power ratios (SPR) each with varying degrees of accuracy and issues. In this work, we present on a simple parameterized model to determine Im in human biological tissue, which allows for computation of patient-specific Im at the voxel level using magnetic resonance imaging (MRI). The model requires the measurement of three parameters by MRI with only two parameters, mass percent water content and mass percent hydrogen content in organic molecules, required for the special case of soft tissues. The accuracy of this Im determination method was evaluated in available "standard" (ICRU Report #44) human tissues. The sensitivity of this Im determination method to in-vivo perturbations was also tested by calculating the effect of 10% variations of the experimentally measurable parameters on Im and SPR. For the human tissues modeled in this work, a high level of accuracy with low susceptibility to perturbations in measurement error was achieved in the prediction of Im. Root-mean-square errors (RMSE) in Im were within 0.77% and 1.8% for both soft and bony tissues and were 0.09% and 0.2% for soft and bony tissues SPR, respectively, assuming knowledge of electron density.Proof of principle MR measurements and model-based computations of Im and SPR were taken in phantom for a series of hydrogenous solutions and compared against expected Im and SPR calculations from known elemental composition. MR determined Im and SPR values in a known composition solution were determined to within 5% and 0.52%, respectively. We present on a novel model to accurately calculate mean ionization potential from measurements acquirable by MRI and show feasibility in phantom.

show abstract

Section: Discussionmentioning

confidence: 92%

Determination of mean ionization potential using magnetic resonance imaging for the reduction of proton beam range uncertainties: theory and application

Sudhyadhom¹

2017

Phys. Med. Biol.

View full text Add to dashboard Cite

show abstract

“…An alternative method for fat suppression is the use of short inversion time inversion recovery imaging which is less dependent on the homogeneity of the main magnetic field [47,61,69] . However, decreased signal-to-noise ratio with loss of tissue signal resolution and grainy appearance of final images is a compromise [52,75] . Lee et al [76] and Potter et al [77] described a 'view angle tilting' technique to decrease metallic artifacts by the application of a ''compensatory gradient'' during imaging acquisitions, to correct for inhomogeneous perturbations in the local magnetic field in the vicinity of a metallic device.…”

Section: Magnetic Resonance Imagingmentioning

confidence: 99%

Spinal fusion-hardware construct: Basic concepts and imaging review

Nouh¹

2012

WJR

View full text Add to dashboard Cite

The interpretation of spinal images fixed with metallic hardware forms an increasing bulk of daily practice in a bus�� imaging department. Radio�ogists are required to be familiar with the instrumentation and operative options used in spinal fixation and fusion procedures, especia�� in his or her institute. This is critica� in eva�uat-ing the position of imp�ants and potentia� comp�ications associated with the operative approaches and spinal fixation devices used. Thus, the radiologist can play an important role in patient care and outcome. This review out�ines the advantages and disadvantages of common�� used imaging methods and reports on the best yield for each modality and how to overcome the problematic issues associated with the presence of metallic hardware during imaging. Baseline radiographs are essentia� as the�� are the base�ine point for eva�uation of future studies shou�d patients deve�op s��mptoms suggesting possib�e comp�ications. The�� ma�� justif�� further imaging workup with computed tomography, magnetic resonance and/or nuc�ear medicine studies as the eva�u-ation of a patient with a spinal implant involves a multimodality approach. This review describes imaging features of potential complications associated with spinal fusion surgery as well as the instrumentation used. This basic knowledge aims to help radiologists approach ever��da�� practice in c�inica� imaging.

show abstract

“…Reliable fat-water separation in magnetic resonance imaging (MRI) has a wide range of clinical applications [1]. As the fat signal has a relatively short T1 relaxation time, its bright appearance, without separation or suppression, can obscure pathological structures and patterns of edema, inflammation, or enhancing tumors [1].…”

Section: Introductionmentioning

confidence: 99%

“…As the fat signal has a relatively short T1 relaxation time, its bright appearance, without separation or suppression, can obscure pathological structures and patterns of edema, inflammation, or enhancing tumors [1]. Additionally, if separated, the fat signal can highlight pathologies such as fatty tumors.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Correction of Fat-Water Swaps in Dixon MRI

Glocker

Konukoğlu

Lavdas

et al. 2016

Lecture Notes in Computer Science

View full text Add to dashboard Cite

Abstract. The Dixon method is a popular and widely used technique for fat-water separation in magnetic resonance imaging, and today, nearly all scanner manufacturers are offering a Dixon-type pulse sequence that produces scans with four types of images: in-phase, out-of-phase, fatonly, and water-only. A natural ambiguity due to phase wrapping and local minima in the optimization problem cause a frequent artifact of fat-water inversion where fat-and water-only voxel values are swapped. This artifact affects up to 10% of routinely acquired Dixon images, and thus, has severe impact on subsequent analysis. We propose a simple yet very effective method, Dixon-Fix, for correcting fat-water swaps. Our method is based on regressing fat-and water-only images from in-and out-of-phase images by learning the conditional distribution of image appearance. The predicted images define the unary potentials in a globally optimal maximum-a-posteriori estimation of the swap labeling with spatial consistency. We demonstrate the effectiveness of our approach on whole-body MRI with various types of fat-water swaps.

show abstract

Fat and water magnetic resonance imaging

Cited by 321 publications

References 68 publications

Determination of mean ionization potential using magnetic resonance imaging for the reduction of proton beam range uncertainties: theory and application

Determination of mean ionization potential using magnetic resonance imaging for the reduction of proton beam range uncertainties: theory and application

Spinal fusion-hardware construct: Basic concepts and imaging review

Correction of Fat-Water Swaps in Dixon MRI

Contact Info

Product

Resources

About