Parallel-transmit-accelerated spatially-selective excitation mri for reduced-fov diffusion-weighted-imaging of the pancreas

Thierfelder, Kolja M.; Sommer, Wieland H.; Dietrich, Olaf; Meinel, Felix G.; Theisen, Daniel; Paprottka, Philipp M.; Strobl, Frederik F.; Pfeuffer, Josef; Reiser, Maximilian; Nikolaou, Konstantin

doi:10.1016/j.ejrad.2014.06.006

Cited by 32 publications

(37 citation statements)

References 19 publications

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“…. Clinical implementations of PTX–LEx have also been demonstrated at 3 T, focusing on abdominal diffusion‐weighted imaging applications where smaller FOVs can be used, reducing the length of the utilised echo planar imaging (EPI) readouts .…”

Section: Dynamic Ptxmentioning

confidence: 99%

Parallel transmission for ultrahigh‐field imaging

et al. 2015

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The development of MRI systems operating at or above 7 T has provided researchers with a new window into the human body, yielding improved imaging speed, resolution and signal‐to‐noise ratio. In order to fully realise the potential of ultrahigh‐field MRI, a range of technical hurdles must be overcome. The non‐uniformity of the transmit field is one of such issues, as it leads to non‐uniform images with spatially varying contrast. Parallel transmission (i.e. the use of multiple independent transmission channels) provides previously unavailable degrees of freedom that allow full spatial and temporal control of the radiofrequency (RF) fields. This review discusses the many ways in which these degrees of freedom can be used, ranging from making more uniform transmit fields to the design of subject‐tailored RF pulses for both uniform excitation and spatial selection, and also the control of the specific absorption rate. © 2015 The Authors. NMR in Biomedicine published by John Wiley & Sons Ltd.

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Section: Dynamic Ptxmentioning

confidence: 99%

Parallel transmission for ultrahigh‐field imaging

et al. 2015

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“…In addition, conventional single-shot echo-planar imaging sequences are prone to susceptibility artifacts, which with regard to the pancreas are due to the adjacent duodenum and jejunum. To limit these artifacts, a reduced field of view along the phase-encoding direction can be used (34)(35)(36).…”

Section: Dw Mr Image Acquisitionmentioning

confidence: 99%

Diffusion-weighted MR Imaging of the Pancreas: Current Status and Recommendations

Barral¹,

Taouli²,

Guiu³

et al. 2015

Radiology

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Advances in image quality over the past few years, mainly due to refinements in hardware and coil systems, have made diffusion-weighted ( DW diffusion weighted ) magnetic resonance (MR) imaging a promising technique for the detection and characterization of pancreatic conditions. DW diffusion weighted MR imaging can be routinely implemented in clinical protocols, as it can be performed relatively quickly, does not require administration of gadolinium-based contrast agents, and enables qualitative and quantitative assessment of tissue diffusivity (diffusion coefficients). In this review, acquisition parameters, postprocessing, and quantification methods applied to pancreatic DW diffusion weighted MR imaging will be discussed. The current common clinical uses of DW diffusion weighted MR imaging (ie, pancreatic lesion detection and characterization) and the less-common applications of DW diffusion weighted MR imaging used for the diagnosis of pancreatic parenchymal diseases will be reviewed. Also, the limitations of the technique, mainly image quality and reproducibility of diffusion parameters, as well as future directions for pancreatic DW diffusion weighted MR imaging will be discussed. The utility of apparent diffusion coefficient ( ADC apparent diffusion coefficient ) measurement for the characterization of pancreatic lesions is now well accepted but there are a number of limitations. Future well-designed, multicenter studies are needed to better determine the most appropriate use of ADC apparent diffusion coefficient in the area of pancreatic disease.

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“…Other groups reported advantages in liver imaging [11] and breast imaging [22]. Dual-source transmission DWI imaging provides benefits in the assessment of phantom experiments [15], the liver [10,11], the pancreas [14,15,23] the spinal cord [12], the prostate [9,24], and head and neck imaging [25]. All these studies report benefits of dual-source transmission in image acquisition of a small region within the body.…”

Section: Discussionmentioning

confidence: 95%