Musculoskeletal MRI at 3.0 T: relaxation times and image contrast.

Musculoskeletal MRI at 3.0 T: relaxation times and image contrast. Research Abstract Details 

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Musculoskeletal MRI at 3.0 T: relaxation times and image contrast. Abstract Text:

Garry E Gold,Eric Han,Jeff Stainsby,Graham Wright,Jean Brittain,Christopher Beaulieu,

OBJECTIVE: The purpose of our study was to measure relaxation times in musculoskeletal tissues at 1.5 and 3.0 T to optimize musculoskeletal MRI methods at 3.0 T. MATERIALS AND METHODS: In the knees of five healthy volunteers, we measured the T1 and T2 relaxation times of cartilage, synovial fluid, muscle, marrow, and fat at 1.5 and 3.0 T. The T1 relaxation times were measured using a spiral Look-Locker sequence with eight samples along the T1 recovery curve. The T2 relaxation times were measured using a spiral T2 preparation sequence with six echoes. Accuracy and repeatability of the T1 and T2 measurement sequences were verified in phantoms. RESULTS: T1 relaxation times in cartilage, muscle, synovial fluid, marrow, and subcutaneous fat at 3.0 T were consistently higher than those measured at 1.5 T. Measured T2 relaxation times were reduced at 3.0 T compared with 1.5 T. Relaxation time measurements in vivo were verified using calculated and measured signal-to-noise results. Relaxation times were used to develop a high-resolution protocol for T2-weighted imaging of the knee at 3.0 T. CONCLUSION: MRI at 3.0 T can improve resolution and speed in musculoskeletal imaging; however, interactions between field strength and relaxation times need to be considered for optimal image contrast and signal-to-noise ratio. Scanning can be performed in shorter times at 3.0 T using single-average acquisitions. Efficient higher-resolution imaging at 3.0 T can be done by increasing the TR to account for increased T1 relaxation times and acquiring thinner slices than at 1.5 T.

Musculoskeletal MRI at 3.0 T: relaxation times and image contrast. Publishing Authors By Initials

GE Gold,E Han,J Stainsby,G Wright,J Brittain,C Beaulieu,

For similar investigative techniques: epidemiologic methods: epidemiologic research design: reproducibility of results research abstracts see: investigative techniques: epidemiologic methods: epidemiologic research design: reproducibility of results research

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Musculoskeletal MRI at 3.0 T: relaxation times and image contrast. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: AJR. American journal of roentgenology

VOLUME: 183

Page Numbers: 343-51

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ISSN: 0361-803X

DAY: 15

MONTH: Aug

YEAR: 2004

Musculoskeletal MRI at 3.0 T: relaxation times and image contrast. Information

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LANGUAGE: eng

NlmUniqueID: 7708173

Musculoskeletal MRI at 3.0 T: relaxation times and image contrast. Keywords Mesh Terms:

KEYWORDS: Reproducibility of Results

MESH TERMS: anatomy & histology

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Grant and Affiliation Information for Musculoskeletal MRI at 3.0 T: relaxation times and image contrast.

AFFILIATION: Department of Radiology, Stanford University, 300 Pasteur Dr., Grant Bldg. S0-68B, Stanford, CA 94305-5105, USA. gold@stanford.edu

Country: United States

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MEDLINETA: AJR Am J Roentgenol

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