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• W2166518211 abstract "Purpose Zero echo time (ZTE) imaging with single‐pulse excitation is a fast, robust, and silent three‐dimensional (3D) method for MRI of short T 2 tissues. In this technique, algebraic reconstruction serves to fill gaps in the center of k‐space due to finite acquisition dead time. The purpose of this study was to investigate the effect of this operation on depiction characteristics, noise behavior, and achievable bandwidth. Methods The spatial response function (SRF) and noise covariance resulting from ZTE reconstruction were studied using formal analysis, simulations, and phantom experiments. Results Three prominent limiting phenomena were identified: SRF behavior within the field of view, heightened sensitivity to out‐of‐band signal sources, and noise amplification. The related errors all appear as image distortions of low spatial frequency and are strongly attenuated upon the transition from one‐dimensional projections to 3D image data. Relying on these observations, ZTE imaging was accomplished with a previously unreached gap size, permitting the depiction of a solid sample with T 2 ≈ 25 µs at a bandwidth of 500 kHz. Conclusion The tightest bandwidth limits in ZTE arise from background signal and radiofrequency (RF) switching transients. Significant advances in ZTE performance will be afforded by faster transmit‐receive (T/R) switching with negligible transients and RF coils free of background signal. Magn Reson Med 74:1236–1247, 2015. © 2014 Wiley Periodicals, Inc." @default.
• W2166518211 created "2016-06-24" @default.
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• W2166518211 date "2014-10-30" @default.
• W2166518211 modified "2023-10-16" @default.
• W2166518211 title "Exploring the bandwidth limits of ZTE imaging: Spatial response, out-of-band signals, and noise propagation" @default.
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• W2166518211 doi "https://doi.org/10.1002/mrm.25509" @default.
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