2014
DOI: 10.1097/rli.0000000000000049
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Ophthalmic Magnetic Resonance Imaging at 7 T Using a 6-Channel Transceiver Radiofrequency Coil Array in Healthy Subjects and Patients With Intraocular Masses

Abstract: ObjectivesThis study is designed to examine the feasibility of ophthalmic MRI at 7.0 T using a local six-channel transmit/receive radiofrequency (RF) coil array in healthy volunteers and patients with intraocular masses. Materials and MethodsA novel six-element transceiver RF coil array that makes uses of loop elements and that is customized for eye imaging at 7.0 T is proposed. Considerations influencing the RF coil design and the characteristics of the proposed RF coil array are presented. Numerical electro-… Show more

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Cited by 33 publications
(30 citation statements)
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“…These challenges are continually being addressed, for example, by optimizing MRI hardware settings, or developing gaze fixation schemes that improve image quality at submillimeter resolution within clinically acceptable scan time (Stachs O, et al IOVS 2014;55:ARVO E-Abstract 5843 and Refs. [72][73][74]. Further work is also needed to refine the sensitivity of our technique to detect more subtle differences in MR signals that are likely to be associated with more graded pressure differences in both young and aged human eyes in nonfixed fresh tissues or in vivo.…”
Section: Discussionmentioning
confidence: 95%
“…These challenges are continually being addressed, for example, by optimizing MRI hardware settings, or developing gaze fixation schemes that improve image quality at submillimeter resolution within clinically acceptable scan time (Stachs O, et al IOVS 2014;55:ARVO E-Abstract 5843 and Refs. [72][73][74]. Further work is also needed to refine the sensitivity of our technique to detect more subtle differences in MR signals that are likely to be associated with more graded pressure differences in both young and aged human eyes in nonfixed fresh tissues or in vivo.…”
Section: Discussionmentioning
confidence: 95%
“…This finding is in alignment with a recent in vivo study performed at The results reported for this feasibility study are likely to pave the way for further advances in RF coil technology tailored for assessment of skin sodium content. These efforts will help to further gain sensitivity by reducing loop element size and by including more loop elements as recently demonstrated for transceiver arrays customized for proton MRI at 7.0 T (41)(42)(43)(44)(45)(46), and hence will contribute to further improvements of in-plane resolution. The use of a large slice thickness for transversal slices of skin in the lower leg implies perfect orientation of the calf-skin and agarose standards parallel to the main axis of the MR scanner to reduce partial volume effects of skin Na + signal, Na + free environment and low Na + subcutaneous fat tissue.…”
Section: Discussionmentioning
confidence: 99%
“…For example, a two‐channel transmit loop together with an eight‐channel receive array was reported to be feasible for sodium cardiac imaging at 3.0 T . The measured Q ‐ratio of 8 for the proposed four‐channel transceiver array leaves reasonable space for further subdivision of the elements into an array of eight or more transmission/reception elements, as recently demonstrated for transceiver arrays customized for 1 H MRI at 7.0 T . To advance the proton imaging capabilities, it stands to reason to incorporate multiple 1 H elements into the anterior and posterior sections of the 23 Na array to support high spatial resolution and accelerated imaging of the heart .…”
Section: Discussionmentioning
confidence: 81%