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This study aims to conduct an analysis in order to compare the differences in thegeneration of artifacts occurring due to the difference between 1.5 T and 3.0 T MRI equipmentwith three types of pulse sequence applied to the knee MRI. with data on 121 patients transmittedto PACS, this study qualitatively analyzed SNRs and carried out a qualitative evaluation, dividingAC, ACL and PCL into three steps. In the quantitative analysis, The SNRs of 3.0 T MRI showeda more significant result, which was higher than that measured in the 1.5 T MRI (p<0.05). Inthe qualitative analysis, also showed similar to results when compared with 1.5 T (p<0.05). In conclusion, the increased signal to noise ratio at 3.0 T resulted in a better visibility of themajority of AC, ACL, PCL structures as compared to 1.5 T equipment. This study will becomethe guidelines for musculoskeletal system when examining the patients in knee MRI using the twotypes of equipment in the clinical setting in the future.
DWI of biological effects are independent of magnetic field strength in various regions. High field strength, however, does affect the signal to noise ratio (SNR) and artifacts of diffusion weighted imaging (DWI) images, which ultimately will influence the quantitative of diffusion imaging . In this study, the effects of field strength on DWI are reviewed. The effects of the diseases also are discussed. Comparing DWI in cerebellum, WM, GM, Hyperacute region measurements both as a function of field strength (1.5 T and 3.0 T). Overall, the SNR of the DWI roughly doubled going from 1.5 T to 3.0 T. In summary, DWI studies at 3.0 T is provided significantly improved DWI measurements relative to studies at 1.5 T.
Perfusion magnetic resonance image of biological mechanism are independent of magnetic field strength in hyper acute ischemic stroke. 3.0 T magnetic field, however, does affect the SNRs (signal to noise ratio) and artifacts of PMRI (perfusion magnetic resonance image), which basically will influence the quantitative of PMRI. In this study, the effects of field strength on PMRI are analyzed. The effects of the diseases also are discussed. PMRI in WM (white matter), GM (gray matter), hyper acute ischemic stroke were companied with 1.5 T and 3.0 T on SNR. PMRI also was compared to the SI difference after setting ROI (region of interest) in left and right side of the brain. In conclusion, the SNRs and SI of the 3.0 T PMRI showed higher than those at 1.5 T. In summary, PMRI studies at 3.0 T is provided significantly improved perfusion evaluation when comparing with 1.5 T.
Perfusion MRI is useful for pathological changes and provides quantitative informationabout cerebral blood vessels. Perfusion has an exogenous perfusion imaging techniqueusing the first-pass technique, which have an endogenous perfusion imaging technique usingmagnetization transfer, the spin tagging (ST) technique. There are DSC and DCE methods for theuse of exogenous contrast medium, and there are PASL and CASL for the endogenous methodwithout using contrast medium. These two types of techniques require selective screening ofthe patient̓s condition or the information they wish to provide. In general, DSC techniques areapplied to patients with acute cerebral hemolytic disease, and DSE methods are provided forpatients with brain tumors. In addition, CASL is applied to allergy, fertile women, nephropathy,and pediatric patients with ST techniques. Perfusion MRI, unlike SPECT, is useful in an agingsociety with differentiated techniques that do not use radioactive materials and will be applied toquantitatively analyze various diseases in the future.