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Comparison of MR pulse sequences in the detection of multiple sclerosis lesions
T A Yousry1, M Filippi, C Becker
1Department of Neuroradiology, Klinikum Grosshadern, Ludwig-Maximilian University, Munich, Germany.
Purpose:
To compare the sensitivity of conventional spin-echo, fast spin-echo, fast fluid-attenuated inversion recovery (FLAIR), and turbo gradient spin-echo MR sequences in the detection of multiple sclerosis lesions.
Methods:
Conventional spin-echo, fast spin-echo, fast FLAIR, and turbo gradient spin-echo sequences were performed on a 1.0-T MR imager in seven patients with clinically definite multiple sclerosis. The images in each sequence were evaluated by two raters and consensus was reached by agreement.
Results:
In comparing conventional spin-echo with fast spin-echo sequences, five lesions were seen only by conventional spin-echo and 63 were seen only by fast spin-echo; in comparing conventional spin-echo with fast FLAIR sequences, 18 lesions were seen only by conventional spin-echo and 109 only by fast FLAIR; in comparing conventional spin-echo with turbo gradient spin-echo sequences, 51 lesions were seen only by conventional spin-echo and seven only by turbo gradient spin-echo; in comparing fast spin-echo with fast FLAIR sequences, 45 lesions were seen only by fast spin-echo and 52 only by fast FLAIR.
Conclusion:
Fast spin-echo and fast FLAIR sequences improve the sensitivity of MR imaging in the detection of multiple sclerosis lesions with reduced acquisition time as compared with conventional spin-echo sequences. These sequences should therefore be considered for serial studies in patients with multiple sclerosis. The sensitivity of turbo gradient spin-echo was inferior to the other sequences, but its reduced acquisition time could make this technique the ideal choice for patients who cannot tolerate longer examination times.
Insights
Fast spin-echo and fast FLAIR MRI sequences significantly improve multiple sclerosis lesion detection compared to conventional spin-echo. Turbo gradient spin-echo is less sensitive but offers faster scan times for patient tolerance.
Area of Science:
- Radiology
- Neurology
- Medical Imaging
Background:
- Multiple sclerosis (MS) is a chronic inflammatory demyelinating disease of the central nervous system.
- Accurate detection of MS lesions is crucial for diagnosis, monitoring disease progression, and evaluating treatment efficacy.
- Magnetic Resonance Imaging (MRI) is the primary modality for visualizing MS lesions, but sequence selection impacts sensitivity.
Purpose of the Study:
- To compare the diagnostic sensitivity of four MRI sequences for detecting multiple sclerosis lesions.
- Evaluate conventional spin-echo (CSE), fast spin-echo (FSE), fast fluid-attenuated inversion recovery (FLAIR), and turbo gradient spin-echo (TGSE) sequences.
Main Methods:
- Seven patients with clinically definite multiple sclerosis underwent MRI on a 1.0-T imager.
- Images were acquired using CSE, FSE, fast FLAIR, and TGSE sequences.
- Two independent raters evaluated lesion detection, with consensus reached by agreement.
Main Results:
- Fast FLAIR detected the most lesions (109) compared to CSE.
- FSE also showed improved lesion detection (63) over CSE.
- TGSE demonstrated lower sensitivity than FSE and fast FLAIR, detecting only seven lesions compared to CSE's 51.
Conclusions:
- Fast spin-echo and fast FLAIR sequences enhance sensitivity for detecting multiple sclerosis lesions, offering reduced scan times.
- These advanced sequences are recommended for serial MRI studies in MS patients.
- Turbo gradient spin-echo, while less sensitive, provides a valuable option for patients with limited examination tolerance due to its speed.