RESUMO
OBJECTIVE: To investigate the feasibility of tissue similarity map (TSM)-based relative cerebral blood volume (rCBV) assessment in evaluating the hemodynamic characteristics of gliomas and in differentiating high-grade gliomas from low-grade ones without concentration time curve (CTC). MATERIALS AND METHODS: TSM-based rCBV (rCBV TSM ) and conventional rCBV (rCBV PWI ) maps were generated (n = 35). The differences in percentage and concordance correlation coefficient (CCC) of the rCBV TSM and rCBV PWI ratios were calculated. The Mann-Whitney test and the receiver operating characteristic (ROC) curve analysis were also performed to examine the relationships of rCBV ratios between high- and low-grade gliomas. The improvement factors of signal to noise ratio (SNR) of rCBV TSM maps were also calculated. RESULTS: The mean difference in percentage between rCBV TSM and rCBV PWI ratios was 4.29 ± 2.62%. The CCC of rCBV TSM and rCBV PWI ratios was 0.9974, with 95% confidence interval of 0.9948, 0.9987, which implied a high agreement between them. The Mann-Whitney test suggested that the rCBV TSM and rCBV PWI ratios of high-grade gliomas were significantly different from those of low-grade gliomas (P < 0.001). The improvement factors of SNR of the rCBV TSM map were 1.31 ± 0.24 for glioma and 1.28 ± 0.24 for normal white matter. CONCLUSION: It is feasible to use rCBV TSM in the evaluation of hemodynamic characteristics of gliomas and differentiation of high- and low-grade gliomas without CTC. Moreover, rCBV TSM maps possess a higher SNR, which allows potentially more accurate diagnosis compared with the conventional ones.
RESUMO
OBJECTIVE: To investigate the association of HLA-DQB1 alleles and artemisia pollen allergic patients of Han and Uygur people in the Xinjiang area. METHOD: PCR-SSP (sequence-specific primer polymerase chain reaction) were used to test fifty Uygur and fifty Han people with allergic rhinitis with hypersensitivity to artemisia pollen in the Xinjiang area. Fifty normal Uygur and fifty normal Han people in the Xinjiang region were enrolled in the control group. RESULT: The frequency of HLA-DQB1 * 05 in the Uygur group with allergic rhinitis was significantly higher (19.4%) than that in the Uygur control group (7%) (P < 0.05). There were no significant difference between in the allergic rhinitis group and in the control group. CONCLUSION: HLA-DQB1 * 05 might be the susceptibility genes of the Uygur patients with allergic rhinitis in the Xinjiang area.
