Post-contrast T1-weighted sequences in pediatric abdominal imaging: comparative analysis of three different sequences and imaging approach

Roque, Andreia; Ramalho, Miguel; AlObaidy, Mamdoh; Herédia, Vasco; Burke, Lauren M. B.; Campos, Rafael O.P. de; Semelka, Richard C.

doi:10.1007/s00247-014-2969-1

Cited by 9 publications

(3 citation statements)

References 28 publications

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“…The multishot spin‐echo sequences with radial k ‐space sampling include BLADE (Siemens Healthcare); PROPELLER (GE Medical Systems); and Multi‐Vane (Philips). These sequences were widely employed to reduce movement artifacts in pediatric cardiovascular MRI and abdominal MRI, even fetal cardiac MRI . T 1 ‐weighted imaging using radial sampling of k ‐space can result in substantial improvement in image quality of postcontrast imaging with free breathing .…”

Section: Techniques To Minimize Sedation For Pediatric Mri Examinationsmentioning

confidence: 99%

Techniques for minimizing sedation in pediatric MRI

Dong

Zhu

Bulas

2019

Magnetic Resonance Imaging

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MRI is used widely in infants and young children. However, in these young cases deep sedation or general anesthesia is often required to minimize motion artifacts during MRI examinations. Although the benefits of MR typically outweigh the potential risks of sedation when delivered by an experienced team, there are increasing concerns regarding the affect of sedation on young children. There continues to be a push to develop various strategies that can minimize the need for sedation. The present review summarizes several technical and clinical approaches that can help decrease the need for sedation in the pediatric patient. Optimization of the MRI environment, the role of child life specialists, feed‐and‐bundle and distraction techniques, noise‐reduction methods, artificial intelligence, and MRI advances to decrease both scan times and motion artifacts will be discussed. Level of Evidence: 5 Technical Efficacy Stage: 1 J. Magn. Reson. Imaging 2019.

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Section: Techniques To Minimize Sedation For Pediatric Mri Examinationsmentioning

confidence: 99%

Techniques for minimizing sedation in pediatric MRI

Dong

Zhu

Bulas

2019

Magnetic Resonance Imaging

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“…High resolution, T1-weighted (T1w) imaging is widely used in neuroscientific and clinical applications, for example, with demyelinating diseases (e.g. multiple sclerosis) (Spies et al 2013), brain development and pediatric imaging (Roque et al 2014), brain aging (Maniega et al 2015). The most common way of generating T1w images is by magnetization-prepared rapid gradient-echo or fast spin echo (FSE) sequences.…”

Section: Introductionmentioning

confidence: 99%

“…Radial imaging has wide clinical applications because it is less sensitive to motion artifacts and allows for reduced field of view (FOV) imaging (Chandarana et al 2011). A study on pediatric abdominal imaging suggested that 3D radial outperforms its Cartesian counterpart due to motion insensitivity (Roque et al 2014). The disadvantages of radial imaging are complications in reconstruction and k-space trajectory design, sensitivity to gradient inaccuracy and off-resonance effect (Wright et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Silent 3D MR sequence for quantitative and multicontrast T1 and proton density imaging

Liu¹,

Gómez

Solana

et al. 2020

Phys. Med. Biol.

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This study aims to develop a silent, fast and 3D method for T1 and proton density (PD) mapping, while generating time series of T1-weighted (T1w) images with bias-field correction. Undersampled T1w images at different effective inversion times (TIs) were acquired using the inversion recovery prepared RUFIS sequence with an interleaved k-space trajectory. Unaliased images were reconstructed by constraining the signal evolution to a temporal subspace which was learned from the signal model. Parameter maps were obtained by fitting the data to the signal model, and bias-field correction was conducted on T1w images. Accuracy and repeatability of the method was accessed in repeated experiments with phantom and volunteers. For the phantom study, T1 values obtained by the proposed method were highly consistent with values from the gold standard method, R2 = 0.9976. Coefficients of variation (CVs) ranged from 0.09% to 0.83%. For the volunteer study, T1 values from gray and white matter regions were consistent with literature values, and peaks of gray and white matter can be clearly delineated on whole-brain T1 histograms. CVs ranged from 0.01% to 2.30%. The acoustic noise measured at the scanner isocenter was 2.6 dBA higher compared to the in-bore background. Rapid and with low acoustic noise, the proposed method is shown to produce accurate T1 and PD maps with high repeatability by reconstructing sparsely sampled T1w images at different TIs using temporal subspace. Our approach can greatly enhance patient comfort during examination and therefore increase the acceptance of the procedure.

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Advanced imaging techniques in pediatric body MRI

2017

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While there are many challenges specific to pediatric abdomino-pelvic MRI, many recent advances are addressing these challenges. It is therefore essential for radiologists to be familiar with the latest advances in MR imaging. Laudable efforts have also recently been implemented in many centers to improve the overall experience of pediatric patients, including the use of dedicated radiology child life specialists, MRI video goggles, and improved MR suite environments. These efforts have allowed a larger number of children to be scanned while awake, with fewer studies being done under sedation or anesthesia; this has resulted in additional challenges from patient motion and difficulties with breath-holding and tolerating longer scan times. In this review, we highlight common challenges faced in imaging the pediatric abdomen and pelvis and discuss the application of the newest techniques to address these challenges. Additionally, we highlight the newest advances in quantified imaging techniques, specifically in MR liver iron quantification. The techniques described in this review are all commercially available and can be readily implemented.

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Post-contrast T1-weighted sequences in pediatric abdominal imaging: comparative analysis of three different sequences and imaging approach

Abstract: Our preliminary results support the preference of fat-suppressed radial 3-D-GRE as the best post-contrast T1-weighted imaging approach for patients under the age of 5 years, when dynamic imaging is not essential.

Cited by 9 publications

References 28 publications

Techniques for minimizing sedation in pediatric MRI

Techniques for minimizing sedation in pediatric MRI

Silent 3D MR sequence for quantitative and multicontrast T1 and proton density imaging

Advanced imaging techniques in pediatric body MRI

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