ABSTRACT
Objective To investigate the application significance of 3.0T MR three dimensional double-echo steady state(3D-DESS) and three dimensional-true fast imaging with steady-state procession(3D-True FISP) sequences in diagnosis of wrist cartilage of rheumatoid arthritis (RA).Methods 26 patients who were clinically diagnosed with RA underwent wrist MR scans with 3D-DESS and 3D-True FISP sequences, while both sequences' scanning were achieved on 20 of them.340 articular-surface morphological conditions' were observed,which were divided into level 0, level 1 and level 2 damages according to morphological performance,and recorded on 3D-DESS and 3D-True FISP sequence respectively.The diagnostic differences in the number of lesions were compared for two sequences.Results The numbers were 79 and 50 for level 1 damage and 23 and 33 for level 2 damage on 3D-DESS and 3D-True FISP sequence respectively (P<0.05).The artifacts were showed in 14 patients on 3D-True FISP,and only two patients on 3D-DESS.Conclusion 3D-DESS sequence does better than 3D-True FISP in displaying RA wrist cartilage,which is able to provide certain help for treatment and prognosis evaluation of RA.
ABSTRACT
Objective To compare the imaging quality of articular cartilage of the knee with 3D-sampling perfection with applica-tion optimized contrast using different flip angle evolutions (3D-SPACE),3D-true fast imaging with steady-state precession (3D-True FISP)and 2D-fast-spin-echo-proto-density(2D-FSE-PD)sequences.Methods 40 healthy volunteers and 20 patients of knee joints were examined with 3D-SPACE,3D-True FISP and 2D-FSE-PD sequences at 1.5T MRI.Signal-noise ratio (SNR),contrast-to-noise ratio (CNR)and lesion visualization of articular cartilage were compared.Results 3D-SPACE showed the highest SNR of cartilage and CNR of fluid/cartilage among the three sequences (P <0.05).3D-SPACE had the better capability for showing the lev-el I 、level Ⅱcartilage injury comparing with 3D-True FISP,but no significant difference between the cartilage injury at level Ⅲ and level Ⅳ.For all levels of cartilage injury,3D sequence was better than the 2D sequence.Conclusion Compared with the 3D-True FISP sequence and 2D-FSE-PD sequence,3D-SPACE sequence can show the structure of knee and knee cartilage injury better.