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  Which method provides most insight into tumors ! 3T (fluid suppr.) APTw, 3T CEST-MRF or 7T multi-pool CEST?

Sedykh, M., Fabian, M., Herz, K., Perlman, O., Farrar, C., Mennecke, A., et al. (2022). Which method provides most insight into tumors! 3T (fluid suppr.) APTw, 3T CEST-MRF or 7T multi-pool CEST? In 9th International Workshop on Chemical Exchange Saturation Transfer Imaging (CEST 2022) (pp. 10).

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Sedykh, M, Author
Fabian, M, Author
Herz, K1, Author           
Perlman, O, Author
Farrar, C, Author
Mennecke, A, Author
Schmidt, M, Author
Dörfler, A, Author
Zaiss, M1, Author           
Affiliations:
1Department High-Field Magnetic Resonance, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497796              

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 Abstract: Which method provides most insight into tumors ! 3T (fluid suppr.) APTw, 3T CEST-MRF or 7T multi-pool CEST? Maria Sedykh1, Moritz Fabian1, Kai Herz2,3, Or Perlman4, Chris Farrar4, Angelika Mennecke1, Manuel Schmidt1, Arnd Dörfler1, and Moritz Zaiss1,2 1Institute of Neuroradiology, Universitätsklinikum Erlangen, Friedrich-Alexander Universität Erlangen Nürnberg, Germany, 2Magnetic Resonance Center, Max-Planck-Institute for Biological Cybernetics, Tübingen, Germany, 3 Department of Biomedical Magnetic Resonance, University of Tübingen, Tübingen, Germany, 4 Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA, USA ! Oral or Poster | Contact Email: moritz.zaiss@fau.de KEYWORD: ! Tumor ! Novel Acquistion INTRODUCTION: Many CEST techniques were shown to provide insight into tumors, e.g. 3T APTw imaging, 3T CEST fingerprinting, and 7T multi-pool CEST. Herein we report one case of a patient diagnosed with glioblastoma, WHO grade IV, who could be measured with all above mentioned techniques to reveal their relative performance and correlations. METHODS: The patient was measured at a Siemens PRISMA scanner (3T, 64-Rx, 1Tx) and Siemens TERRA scanner (7T, 32-Rx, 8 pTx coil) after written informed consent. The 3T APTw following the standard APTw_001(3) (pulsed rf irradiation of 2 s duration at DC = 90% and a 2 μT B1 level) was applied followed by a 3D snapshot GRE readout. The 3T CEST MRF pulseq-files(1, 2) were played out followed by a 3D-EPI readout. The post-processing of the data included the usage of neural networks and was performed according to (2), generating maps for MT pool fraction fmt and exchange rate kmt, and solute amide fraction fs and exchange rate ks. The 7T multi-pool CEST protocol was measured with the MIMOSA approach (4) at 0.72 !T and 1.00 !T followed by a 3D snapshot GRE. Figure 1 shows data of the techniques in tumor and WM ROIs. ! RESULTS: The tumor area can be outlined in all presented maps Figure 2, but with different apparent features. The 3T-APTw highlights the overall tumor area, including necrotic and the liquefied tissue in the cyst, identified on the MPRAGE in Figure 2a. The fluid suppressed APTw FS-APTw (see separate abstract) the liquid areas are suppressed. In most 3T MRF and all 7T multi-pool contrasts, the cyst and the necrotic area are hypo-intense, in 3T MRF kmt necrosis is hyper-intense. While the selective 7T-amide-CEST shows similar areas highlighted as 3T-APTw (except for cyst and necrosis) and as 3T FS-APTw, the quantitative MRF amide exchange rate ks and concentration fs do not show elevated signals. Most contrast in 3T MRF is seen in the MT pool fraction fmt and exchange rate kmt, the latter correlated to the MT line-width. The most plausible correlation is observed between fmt, 7T MT and 7T NOE and T1 and T2, as lowered MT pool size fmt is (anti-)correlated with all values: fmt, 7T MT and 7T NOE all are hypo-intense in the tumor region, and WM brighter than GM, T1 and T2 the other way around. The 3T MRF MT exchange rate map shows increased values in the tumor area, but kmt was found to be decreased in animal tumors(2). DISCUSSION: Most prominent findings are (i) that 3T APTw has a strong relaxation and MT contribution and shows a liquid artifact. Interestingly, 3T FS-APTw and isolated Lorentzian 7T amide CEST partly correlate in the tumor area, but 7T shows finer structures. (ii) 7T and most MRF maps identify the necrosis and the cyst properly hypointense, while APTw shows the cyst even brighter than the contrast enhancing tumor area. (iii) The MRF fmt contrast is in line with MT and relaxation findings, however, the outcome of MRF kmt, fs and ks is unexpected compared to previous animal data, as well as compared to the 7T insights. As MRF has the most complicated pipeline, further investigations are needed for a better interpretation of the method. CONCLUSION: We showed an unseen variety of CEST imaging methods applied in the same brain tumor patient. Coarse features can be observed in all methods, with MRF and 7T CEST being more versatile in some tumor parts. Isolation, separation and smarter combination of different contrast is still needed to improve the diagnostic performance of CEST.

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 Dates: 2022-08
 Publication Status: Published online
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Title: 9th International Workshop on Chemical Exchange Saturation Transfer Imaging (CEST 2022)
Place of Event: Atlanta, GA, USA
Start-/End Date: 2022-08-07 - 2022-08-10

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Title: 9th International Workshop on Chemical Exchange Saturation Transfer Imaging (CEST 2022)
Source Genre: Proceedings
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Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 10 Identifier: -