Nonenhanced ECG-gated time-resolved 4D steady-state free precession (SSFP) MR angiography (MRA) of cerebral arteries: Comparison at 1.5 T and 3 T

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• 作者：R.S. Lanzman^a ; ^{Rotem.Lanzman@med.uni-duesseldorf.de} ; P. Krö ; pil^a ; ¹ ; P. Schmitt^b ; ² ; H.J. Wittsack^a ; ¹ ; D. Orzechowski^a ; ¹ ; J. Kuhlemann^a ; ¹ ; C. Buchbender^a ; ¹ ; F.R. Miese^a ; ¹ ; G. Antoch^a ; ¹ ; D. Blondin^a ; ¹
• 关键词：Nonenhanced MRA ; Steady-state free precession (SSFP) ; 3&#xA0 ; T ; Cerebral artery
• 刊名：European Journal of Radiology
• 出版年：2012
• 期刊代码：93_0720048x
• 类别：med
• 出版时间：April, 2012
• 卷：81
• 期：4
• 页码：e531-e535
• 文件大小：709 K

摘要

Purpose

To compare image quality of nonenhanced time-resolved 4D steady-state free precession MR angiography (4D SSFP MRA) of cerebral arteries at 1.5 T and 3 T.

Materials and methods

12 healthy subjects (mean age 29.4 卤 6.9 years) were studied at both 1.5 T and 3 T. Two different positions of the acquisition slab were evaluated; in one acquisition the imaging slab included the carotid siphon (鈥淪_low鈥?, in the other acquisition the imaging slab was placed superior to the carotid siphon (鈥淪_high鈥?. Subjective image quality of cerebral arteries was assessed independently by two readers on a 4-point scale. Relative Signal-to-Noise-Ratio (SNR) was determined for the M1 segment of the middle cerebral artery.

Results

Subjective image quality of the anterior cerebral artery (segments A1, A2) was significantly higher at 1.5 T as compared to 3 T, while 3 T provided significantly higher image quality for segment P3 of the posterior cerebral artery. For the middle cerebral artery (segments M1-M3), image quality was significantly higher at 1.5 T than at 3 T when the carotid siphon was included in the acquisition slab (鈥淪_low鈥?, while no significant difference was found between 1.5 T and 3 T with 鈥淪_high鈥? Relative SNR was significantly higher at 1.5 T (23.1 卤 5.1) as compared to 3 T (12.1 卤 7.8) for 鈥淪_low鈥?and significantly higher at 3 T (29.8 卤 5.9) than at 1.5 T (24.2 卤 3.6) for 鈥淪_high鈥?

Conclusion

Our results indicate that 4D SSFP MRA should preferably be performed at 1.5 T with inclusion of the carotid siphon in the acquisition slab, which might be required for the assessment of intracranial collateral flow.