Iterative Decomposition of Water and Fat with Echo Asymmetry and Least-Squares Estimation (IDEAL) Fast Spin-Echo Imaging of the Ankle: Initial Clinical Experience

Fuller, Samuel E.; Reeder, Scott B.; Shimakawa, Ann; Yu, Hong; Johnson, Jane W.; Beaulieu, Christopher; Gold, Garry E.

doi:10.2214/ajr.05.0930

Cited by 44 publications

(36 citation statements)

References 14 publications

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“…Several studies have reported on the usefulness of the IDEAL technique with respect to improving image quality by reducing artifacts in the extremities and spine (4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15). Previous reports have mentioned that the IDEAL technique improves visibility of the detailed anatomy (4)(5)(6)(7)(8)(9)(10)(11)(12), by enabling more homogeneous fat suppression and reducing tissue obscuring artifacts produced around metallic fixation devices in the spine.…”

Section: Discussionmentioning

confidence: 99%

“…1, 2). Several studies have reported on the effectiveness of IDEAL for reducing the degrees of susceptibility artifacts around areas exhibiting abrupt contour changes in the extremities (12)(13)(14). Metallic artifacts around metallic implants cause failed fat suppression and signal loss due to inadvertent water suppression caused by magnetic field inhomogeneity.…”

Section: Discussionmentioning

confidence: 99%

“…Iterative decomposition of water and fat with echo asymmetry and least-squares estimation (IDEAL) technique using three asymmetric echo times and the three-point Dixon method for separating fat and water was introduced as an alternative solution for homogeneous fat suppression and reducing metal induced artifacts (4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14). Calculation of the quantity of magnetic field inhomogeneity in each pixel from data is applied to generate the field map of IDEAL, by using asymmetric echoes to prevent fat-water "swapping", which is frequently encountered using symmetric echoes, and by using the least-squares method.…”

Section: Introductionmentioning

confidence: 99%

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Improvement of Fat Suppression and Artifact Reduction Using IDEAL Technique in Head and Neck MRI at 3T

Hong

Lee

Kang

et al. 2016

Investig Magn Reson Imaging

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Original ArticlePurpose: To quantitatively and qualitatively compare fat-suppressed MRI quality using iterative decomposition of water and fat with echo asymmetry and leastsquares estimation (IDEAL) with that using frequency selective fat-suppression (FSFS) T2-and postcontrast T1-weighted fast spin-echo images of the head and neck at 3T. Materials and Methods: The study was approved by our Institutional Review Board. Prospective MR image analysis was performed in 36 individuals at a single-center. Axial fat suppressed T2-and postcontrast T1-weighted images with IDEAL and FSFS were compared. Visual assessment was performed by two independent readers with respect to; 1) metallic artifacts around oral cavity, 2) susceptibility artifacts around upper airway, paranasal sinus, and head-neck junction, 3) homogeneity of fat suppression, 4) image sharpness, 5) tissue contrast of pathologies and lymph nodes. The signal-to-noise ratios (SNR) for each image sequence were assessed. Results: Both IDEAL fat suppressed T2-and T1-weighted images significantly reduced artifacts around airway, paranasal sinus, and head-neck junction, and significantly improved homogeneous fat suppression in compared to those using FSFS (P < 0.05 for all). IDEAL significantly decreased artifacts around oral cavity on T2-weighted images (P < 0.05, respectively) and improved sharpness, lesion-to-tissue, and lymph node-to-tissue contrast on T1-weighted images (P < 0.05 for all). The mean SNRs were significantly improved on both T1-and T2-weighted IDEAL images (P < 0.05 for all). Conclusion: IDEAL technique improves image quality in the head and neck by reducing artifacts with homogeneous fat suppression, while maintaining a high SNR.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Improvement of Fat Suppression and Artifact Reduction Using IDEAL Technique in Head and Neck MRI at 3T

Hong

Lee

Kang

et al. 2016

Investig Magn Reson Imaging

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“…Las secuencias convencionales fast spin echo en ponderación T1, T2 y STIR fueron reemplazadas por secuencias 3 D de alta resolución que derivan del método Dixon (13) , que trabaja en base a imágenes en fase/fuera de fase, con saturación de agua y/o de grasa. La secuencia IDEAL (Iterative Decomposition of water and fat with Echo Asymmetry and Least-squares estimation-GE Healthcare, USA), permite el empleo de imágenes en ponderación T1 y T2 con cuatro combinaciones de pulsos de saturación: supresión de agua, supresión de grasa y supresión combinada de agua y grasa en fase y fuera de fase (14,15) . En nuestro protocolo de estudio, ante la presencia de lesiones de aspecto tumoral/pseudotumoral se añaden secuencias de difusión (DWI) y tensor de difusión (DTI) (16,17) .…”

Section: Consideraciones Técnicasunclassified

Neurografía por resonancia magnética en la evaluación de los nervios periféricos

Cejas

2015

Revista Chilena de Radiología

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IntroducciónLa neurografía por resonancia magnética (NRM) es el método por imágenes que permite el estudio de los nervios periféricos a través del empleo de secuencias dedicadas, de alta resolución. El término neurografía (Neurography) fue introducido por Chhabra en el año 2011(1) y en años posteriores surgieron numerosos trabajos avalando esta técnica (2)(3)(4)(5)(6) . Para interpretar la NRM es necesario contar con conocimientos generales de RM, así como de la anatomía y de las lesiones que afectan al sistema neuromuscular. La patología de los nervios y plexos puede dividirse en mononeuropatías y polineuropatías. En las mononeuropatías se encuentran causas como los procesos inflamatorios, el trauma, el atrapamiento, los tumores benignos y malignos de la vaina neural, así como aquellos tumores de estructuras adyacentes que pueden comprimir o invadir al nervio/plexo (7)(8)(9) . En las polineuropatías se destacan las formas hereditarias como la enfermedad de Charcot Marie Tooth y las adquiridas, entre las que se encuentran la poliradiculoneuropatía desmielinizante idiopática crónica, diabetes, vasculitis, inflamación (10)(11)(12) . El objetivo de esta revisión es explicar las consideraciones técnicas sobre la NRM, mencionar las características normales del nervio periférico por NRM y describir la apariencia de las lesiones más frecuentes que afectan a los nervios y plexos. Magnetic resonance neurography in the evaluation of peripheral nerves Abstract: Magnetic resonance neurography (MRN), with high resolution sequences, allows for a detailed study of the plexus and peripheral nerves. For its interpretation, it is necessary to have a general knowledge of MR, as well as of the anatomy of the neuromuscular system and lesions that affect it. Nerve and plexus pathology can be divided into mononeuropathies (for trauma, entrapment or tumors) and hereditary polyneuropathies (such as Charcot-Marie-Tooth disease) or acquired (for chronic idiopathic demyelinating polyradiculoneuropathy, diabetes, vasculitis or inflammation). The objective of this review is to describe the study technique of Magnetic Resonance Neurography as well as the characteristics of the normal and pathological peripheral nerve. Keywords: MRI, MR Neurography, Peripheral nervous system, Peripheral neuropathy. Resumen: La neurografía por resonancia magnética (NRM), con secuencias de alta resolución

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“…The Iterative Decomposition of Water and Fat with Echo Asymmetry and Least-Squares Estimation (IDEAL) FSE imaging has been shown to be a promising fat-suppression technique compared with conventional fat-suppressed FSE MRI of the ankle with excellent SNR and image quality. 12 Potential advantages compared with standard frequency-specific fat-suppression FSE include superior fat-water separation, improved diagnostic quality, superior fluid-cartilage contrast-to-noise ratio, and less image degradation caused by metallic hardware. Disadvantages include slightly longer imaging time and lack of a no-phase-wrap option.…”

Section: T Mri Technique and Artifactsmentioning

confidence: 99%

3T Magnetic Resonance Imaging of Ankle and Hindfoot Tendon Pathology

Collins

Felmlee²

2009

Topics in Magnetic Resonance Imaging

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Ankle tendon pathology is relatively common in the active adult population. Magnetic resonance imaging is often the preferred advanced imaging option for the evaluation of tendon pathology of the hindfoot and ankle. The almost linear increase in signal-to-noise ratio provided by higher field strength imaging allows for improved image resolution and decreased scan times. Newer systems with faster gradients allow for optimal fast spin-echo imaging with lower echo spacing for longer echo train lengths and minimal image blurring. The ability to comfortably scan the ankle within the magnet isocenter using high-field strength-compatible extremity coils further maximizes the image resolution. It is imperative for the radiologist to be aware of necessary protocol adjustments and potential imaging artifacts unique to high-field strength imaging of the ankle. Our review outlines high-field strength magnetic resonance imaging technique and artifacts and also details the specifics of our own methods of ankle imaging.

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Iterative Decomposition of Water and Fat with Echo Asymmetry and Least-Squares Estimation (IDEAL) Fast Spin-Echo Imaging of the Ankle: Initial Clinical Experience

Abstract: IDEAL fast spin-echo imaging is a promising technique for MRI of the ankle.

Cited by 44 publications

References 14 publications

Improvement of Fat Suppression and Artifact Reduction Using IDEAL Technique in Head and Neck MRI at 3T

Improvement of Fat Suppression and Artifact Reduction Using IDEAL Technique in Head and Neck MRI at 3T

Neurografía por resonancia magnética en la evaluación de los nervios periféricos

3T Magnetic Resonance Imaging of Ankle and Hindfoot Tendon Pathology

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