Non-enhanced magnetic resonance imaging of the small bowel at 7 Tesla in comparison to 1.5 Tesla: First steps towards clinical application

Hahnemann, Maria L.; Kraff, Oliver; Maderwald, Stefan; Johst, Sören; Orzada, Stephan; Umutlu, Lale; Ladd, Mark E.; Quick, Harald H.; Lauenstein, Thomas C.

doi:10.1016/j.mri.2015.11.012

Cited by 9 publications

(6 citation statements)

References 23 publications

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“…Our results, in accordance with previous comparison studies, showed that susceptibility artifacts and B1 inhomogeneities of T2-weighted images were significantly increased as compared to lower field strengths [12,29]. Nevertheless, the image quality of T2-weighted images at 5 T was scored as high as for 3 T. The possible explanation is that the overall image quality of the T2-weighted FSE sequence was evaluated based on the corticomedullary differentiation and the delineation of adrenal glands, proximal ureter, renal arteries, and renal veins.…”

Section: Discussionsupporting

confidence: 93%

Renal imaging at 5 T versus 3 T: a comparison study

et al. 2022

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Background Recently, a whole-body 5 T MRI scanner was developed to open the door of abdominal imaging at high-field strength. This prospective study aimed to evaluate the feasibility of renal imaging at 5 T and compare the image quality, potential artifacts, and contrast ratios with 3 T. Methods Forty healthy volunteers underwent MRI examination both at 3 T and 5 T. MRI sequences included T1-weighted gradient-echo (GRE), T2-weighted fast spin echo, diffusion-weighted imaging, and multi-echo GRE T2* mapping. Image quality and presence of artifacts were assessed for all sequences using four-point scales. For anatomical imaging, the signal-to-noise ratio (SNR) and contrast ratio (CR) of abdomen organ tissues were calculated. Besides, for functional imaging, the contrast-to-noise ratio of cortex/medulla was calculated. Wilcoxon signed rank-sum test was used to compare the visual evaluation scores and quantitative measurements between 3 and 5 T images. Results Compared to 3 T examination, T1-weighted sequence at 5 T showed significantly better image quality with higher conspicuity of the renal veins and arteries, and comparable artifacts. Image quality was comparable between both field strengths on T2-weighted images, whereas a significantly higher level of artifacts was observed at 5 T. Besides, 5 T MRI contributed to higher SNR and CR for abdomen organ tissues. For functional imaging, 5 T MRI showed improved corticomedullar discrimination. There was no significant difference between apparent diffusion coefficient of renal at 3 T and 5 T, while 5 T MRI resulted in significantly shorter T2* values in both cortex and medulla. Conclusions 5 T MRI provides anatomical and functional images of the kidney with sufficient image quality.

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Section: Discussionsupporting

confidence: 93%

Renal imaging at 5 T versus 3 T: a comparison study

et al. 2022

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“…As the 8Tx/Rx body array, which served as the standard of reference in this work, has already been used in a broad variety of clinical 7T MRI investigations, [32][33][34][35][36][37][38][39][40] the improved performance of the new combined array holds great promise for 7T UHF body MRI, increasing either the spatial resolution of these examinations or speeding up the acquisition time through use of higher parallel imaging factors. Imaging results in the pelvis of a female volunteer showed high homogeneity at a very high resolution of 0.68 9 0.68 9 0.68 mm³, which was achieved within less than 10 min acquisition time.…”

Section: Discussionmentioning

confidence: 99%

7T ultra‐high field body MR imaging with an 8‐channel transmit/32‐channel receive radiofrequency coil array

et al. 2018

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“…Although the progress in demonstrating the capabilities of UHF MRI body imaging has not advanced as fast as for neuroimaging, at least initial hints at its clinical potential have been revealed. Two recent studies investigated the technical feasibility to image the small bowel with 7T UHF MRI . The authors used an 8‐channel transmit/receive body array RF coil in combination with RF shimming to homogenize the signal in this challenging body region and across the relatively large FOV for small bowel volume coverage (Fig.…”

Section: Abdomenmentioning

confidence: 99%

“…In both studies conducted on healthy volunteers, the authors found good image quality of the small bowel imaged at 7T, which was comparable to the 1.5T findings. Artifacts and residual RF signal inhomogeneities at 7T, however, limited the image quality in single cases, which indicates that body imaging with large FOVs is still the most challenging application of 7T UHF MRI (Fig. ).…”

Section: Abdomenmentioning

confidence: 99%