Dark Blood Contrast-Enhanced Brain MRI Using Echo-uT 1 RESS.

Autor: Edelman RR; Radiology, NorthShore University HealthSystem, Evanston, Illinois, USA.; Radiology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA., Leloudas N; Radiology, NorthShore University HealthSystem, Evanston, Illinois, USA., Ankenbrandt WJ; Radiology, NorthShore University HealthSystem, Evanston, Illinois, USA., Walker MT; Radiology, NorthShore University HealthSystem, Evanston, Illinois, USA., Bobustuc GC; Neurology, NorthShore University HealthSystem, Evanston, Illinois, USA., Bailes JE; Neurosurgery, NorthShore University HealthSystem, Evanston, Illinois, USA., Pruitt AA; Siemens Medical Solutions, Chicago, Illinois, USA., Koktzoglou I; Radiology, NorthShore University HealthSystem, Evanston, Illinois, USA.; Radiology, Pritzker School of Medicine, University of Chicago, Chicago, Illinois, USA.
Jazyk: angličtina
Zdroj: Journal of magnetic resonance imaging : JMRI [J Magn Reson Imaging] 2024 Aug; Vol. 60 (2), pp. 789-797. Date of Electronic Publication: 2023 Nov 10.
DOI: 10.1002/jmri.29124
Abstrakt: Background: The widely used magnetization-prepared rapid gradient-echo (MPRAGE) sequence makes enhancing lesions and blood vessels appear bright after gadolinium administration. However, dark blood imaging using T1-weighted Sampling Perfection with Application optimized Contrast using different flip angle Evolution (T1 SPACE) can be advantageous since it improves the conspicuity of small metastases and leptomeningeal disease. As a potential alternative to T1 SPACE, we evaluated a new dark blood sequence called echo-uT 1 RESS (unbalanced T1 Relaxation-Enhanced Steady-State).
Purpose: We compared the performance of echo-uT 1 RESS with Dixon fid-uT 1 RESS, MPRAGE, and T1 SPACE.
Study Type: Retrospective, IRB approved.
Subjects/phantom: Phantom to assess flow properties of echo-uT 1 RESS. Twenty-one patients (14 female, age range 35-82 years) with primary and secondary brain tumors.
Field Strength/sequences: 3 Tesla/MPRAGE, T1 SPACE, Dixon fid-uT 1 RESS, echo-uT 1 RESS.
Assessment: Flow phantom signal vs. velocity as a function of flip angle and sequence. Qualitative image assessment on 4-point scale. Quantitative evaluation of tumor-to-brain contrast, apparent contrast-to-noise ratio (aCNR), and vessel-to-brain aCNR.
Statistical Tests: Friedman and Mann-Whitney U tests. A P value <0.05 was considered statistically significant.
Results: In the phantom, echo-uT 1 RESS showed greater flow-dependent signal loss than fid-uT 1 RESS. In patients, blood vessels appeared bright with MPRAGE, gray with fid-uT 1 RESS, and dark with T1 SPACE and echo-uT 1 RESS. For MPRAGE, Dixon fid-uT 1 RESS, echo-uT 1 RESS, and T1 SPACE, respective tumor-to-brain contrast values were 0.6 ± 0.3, 1.3 ± 0.5, 1.0 ± 0.4, and 0.6 ± 0.4, while normalized aCNR values were 68.9 ± 50.9, 128.4 ± 59.2, 74.2 ± 42.1, and 99.4 ± 73.9.
Data Conclusion: Volumetric dark blood contrast-enhanced brain MRI is feasible using echo-uT 1 RESS. The dark blood effect was improved vs. fid-uT 1 RESS, while both uT 1 RESS versions provided better tumor-to-brain contrast than MPRAGE. Whereas T1 SPACE provided better tumor aSNR, echo-uT 1 RESS provided better Weber contrast, lesion sharpness and a more consistent dark blood effect.
Evidence Level: 3 TECHNICAL EFFICACY: Stage 1.
(© 2023 The Authors. Journal of Magnetic Resonance Imaging published by Wiley Periodicals LLC on behalf of International Society for Magnetic Resonance in Medicine.)
Databáze: MEDLINE
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