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Erschienen in: European Radiology 6/2016

03.09.2015 | Hepatobiliary-Pancreas

Chemical exchange saturation transfer (CEST) MR technique for in-vivo liver imaging at 3.0 tesla

verfasst von: Shu-Zhong Chen, Jing Yuan, Min Deng, Juan Wei, Jinyuan Zhou, Yì-Xiáng J. Wáng

Erschienen in: European Radiology | Ausgabe 6/2016

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Abstract

Purpose

To evaluate Chemical Exchange Saturation Transfer (CEST) MRI for liver imaging at 3.0-T.

Materials and methods

Images were acquired at offsets (n = 41, increment = 0.25 ppm) from −5 to 5 ppm using a TSE sequence with a continuous rectangular saturation pulse. Amide proton transfer-weighted (APTw) and GlycoCEST signals were quantified as the asymmetric magnetization transfer ratio (MTRasym) at 3.5 ppm and the total MTRasym integrated from 0.5 to 1.5 ppm, respectively, from the corrected Z-spectrum. Reproducibility was assessed for rats and humans. Eight rats were devoid of chow for 24 hours and scanned before and after fasting. Eleven rats were scanned before and after one-time CCl4 intoxication.

Results

For reproducibility, rat liver APTw and GlycoCEST measurements had 95 % limits of agreement of −1.49 % to 1.28 % and −0.317 % to 0.345 %. Human liver APTw and GlycoCEST measurements had 95 % limits of agreement of −0.842 % to 0.899 % and −0.344 % to 0.164 %. After 24 hours, fasting rat liver APTw and GlycoCEST signals decreased from 2.38 ± 0.86 % to 0.67 ± 1.12 % and from 0.34 ± 0.26 % to −0.18 ± 0.37 % respectively (p < 0.05). After CCl4 intoxication rat liver APTw and GlycoCEST signals decreased from 2.46 ± 0.48 % to 1.10 ± 0.77 %, and from 0.34 ± 0.23 % to −0.16 ± 0.51 % respectively (p < 0.05).

Conclusion

CEST liver imaging at 3.0-T showed high sensitivity for fasting as well as CCl4 intoxication.

Key Points

CEST MRI of in-vivo liver was demonstrated at clinical 3 T field strength.
After 24-hour fasting, rat liver APTw and GlycoCEST signals decreased significantly.
After CCl4 intoxication both rat liver APTw and GlycoCEST signals decreased significantly.
Good scan–rescan reproducibility of liver CEST MRI was shown in healthy volunteers.
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Metadaten
Titel
Chemical exchange saturation transfer (CEST) MR technique for in-vivo liver imaging at 3.0 tesla
verfasst von
Shu-Zhong Chen
Jing Yuan
Min Deng
Juan Wei
Jinyuan Zhou
Yì-Xiáng J. Wáng
Publikationsdatum
03.09.2015
Verlag
Springer Berlin Heidelberg
Erschienen in
European Radiology / Ausgabe 6/2016
Print ISSN: 0938-7994
Elektronische ISSN: 1432-1084
DOI
https://doi.org/10.1007/s00330-015-3972-0

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