Musculoskeletal MR imaging at 4 T and at 1.5 T: comparison of relaxation times and image contrast
| Autor: | Farouc A. Jaffer, Stefan Duewell, Robert S. Balaban, S A Chesnick, T L Ceckler, Han Wen, K Ong |
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| Rok vydání: | 1995 |
| Předmět: |
Cartilage
Articular Knee Joint medicine.diagnostic_test business.industry media_common.quotation_subject Relaxation (NMR) Magnetic resonance imaging Champ magnetique Image Enhancement Magnetic Resonance Imaging Mr imaging Image contrast Intensity (physics) Models Structural Nuclear magnetic resonance medicine Humans Contrast (vision) Knee Radiology Nuclear Medicine and imaging High field Muscle Skeletal business media_common |
| Zdroj: | Radiology. 196:551-555 |
| ISSN: | 1527-1315 0033-8419 |
| DOI: | 10.1148/radiology.196.2.7617876 |
| Popis: | PURPOSE: To evaluate the relaxation time-based contrast between the main tissues of the musculoskeletal system as measured in the human knee with magnetic resonance imaging at 4 T and 1.5 T. MATERIALS AND METHODS: Five volunteers underwent 4-T and 1.5-T imaging. Inversion-recovery series were used to measure T1 values, and T2 values were measured with a spin-echo sequence. RESULTS: T1 values increased in all tissues with 4-T imaging. Values increased in muscle from 1 to 1.8 seconds, in fat from 0.3 to 0.4 seconds, and in cartilage from 0.8 to 1.5 seconds. T2 values were 10%-20% shorter in all tissues at 4 T. CONCLUSION: Advantages of 4-T imaging compared with 1.5-T imaging include a higher signal-to-noise ratio and an improved signal difference-to-noise ratio. However, any improvement in signal-to-noise ratio at high field strengths can partially be reduced by the increase in the T1 value. The slightly shorter T2 values at 4 T do not affect image contrast. |
| Databáze: | OpenAIRE |
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