Ultra–High-Field MRI of Knee Joint at 7.0T: Preliminary Experience
| Autor: | Renata La Rocca, Ravinder R. Regatte, Mark E. Schweitzer, Conrado Furtado de Albuquerque Cavalcanti, S. Kubilay Pakin |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Adult
Male musculoskeletal diseases Patellar cartilage Knee Joint Transducers Whole body imaging Fat suppression Radiation Dosage Sensitivity and Specificity Ultra high field Image Interpretation Computer-Assisted medicine Humans Whole Body Imaging Radiology Nuclear Medicine and imaging Cartilage tissues medicine.diagnostic_test business.industry Cartilage Reproducibility of Results Magnetic resonance imaging Equipment Design Anatomy Image Enhancement Magnetic Resonance Imaging Equipment Failure Analysis medicine.anatomical_structure Female business Nuclear medicine |
| Zdroj: | Academic Radiology. 13:1135-1142 |
| ISSN: | 1076-6332 |
| DOI: | 10.1016/j.acra.2006.06.007 |
| Popis: | Rationale and Objectives To measure signal-to-noise ratio (SNR), contrast, and relaxation times (T1 and T2) in human knee joint at 7.0T whole-body scanner. Materials and Methods MRI experiments were performed on a 7.0T Siemens whole-body scanner using an 18-cm diameter transmit/receive knee coil. Normalized SNR and relaxation times (T1 and T2) were computed on all volunteers (healthy, n = 5) for femoral, tibial, and patellar cartilage. Results Average T1 values of femoral, tibial, and patellar cartilages were found as 1.55, 1.76, and 1.62 seconds, respectively. Average T2 values of femoral, tibial, and patellar cartilages were found as 51.3, 43.9, and 39.7 milliseconds, respectively. No statistically significant differences were observed between T1 and T2 values of different cartilage tissues (P > .08 for all comparisons). Compared with previously reported relaxation times of cartilage tissue at 3.0T, an ∼35% increase was observed in T1 values, whereas no significant change was observed in T2. Regional analysis was also performed to investigate the change in relaxation parameters for weight-bearing vs. non–weight-bearing areas. A statistically significant difference was observed in T2 of tibial cartilage (P = .009). The rest of the comparisons yielded insignificant differences (P > .32). Conclusion Our preliminary results demonstrate the feasibility of acquiring high resolution three-dimensional images of knee joint (with and without fat suppression) at 7.0T whole-body scanner. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|