Objective To explore the predictive value of a model established by combining MRI radiomics with clinical features for lymphovascular space invasion(LVSI)and lymph node metastasis(LNM)in early-stage cervical cancer.Methods A retrospective analysis was conducted on relevant data from 123 patients with early-stage cervical cancer confirmed by surgical pathology.They were randomly divided into training set(n=74)and testing set(n=49)in a 6∶4 ratio.The tumor regions in the T2WI-fat suppression(FS),diffusion weighted imaging(DWI),and T1WI with enhancement sequences were segmented and radiomics features were extracted.After screening and dimensionality reduction,the most relevant features were retained.The effectiveness of the model was evaluated using the area under the curve(AUC)of the receiver operating characteristic(ROC)curve.Results The combined model of MRI radiomics-clinical-MRI features had the best predictive performance for early-stage cervical cancer LVSI,with AUC of 0.848 and 0.821 in the training and testing sets,respectively.The predictive performance of various MRI radiomics models for early-stage cervical cancer LNM was superior to the clinical model.Conclusion The MRI radiomics model and clinical model have certain predictive value for early-stage cervical cancer LVSI and LNM,and the combined model performs the best.Radiomics will provide a basis for developing individualized treatment plans in clinical practice.

Objective To investigate the clinical and CT findings features of nonaneurysmal perimesencephalic subarachnoid hem-orrhage(NAPSAH).Methods A retrospective analysis was conducted on 19 cases of NAPSAH confirmed by clinical treatment and follow-up,and their clinical and CT findings features were summarized.Results All patients exhibited mild clinical symptoms and had a good prognosis without complications.The sites of NAPSAH involved the anterior cistern in 17 cases,the suprasellar cistern in 8 cases,the interpeduncular cistern in 7 cases,the anterior cistern only in 1 case,and the suprasellar cistern only in 1 case;Among them,4 cases had vertebrobasilar dolichoectasia(VBD)and 3 cases had tortuous prolongation of vertebrobasilar artery.Conclusion The incidence of NAPSAH is low,the clinical symptoms are mild and good prognosis.It has typical imaging features.Most of its hemorrhage sites are confined to the anterior cistern,suprasellar cistern and interpeduncular cistern.Combining clinical and CT find-ings helpful to improve the accuracy of diagnosis.

Objective To compare the image quality of readout-segmented diffusion weighted imaging(RESOLVE-DWI)and integrated slice-by-slice shimming diffusion weighted imaging(iShim-DWI)in patients with nasopharyngeal carcinoma.Methods A retrospective study was conducted on 26 patients with nasopharyngeal carcinoma confirmed by pathology.The imaging data included RESOLVE-DWI and iShim-DWI.The signal-to-noise ratio(SNR)and contrast-to-noise ratio(CNR)of the two sequences were compared by one deputy chief imaging technician.And two experienced radiologists used the 5-point scoring scheme to compare the lesion clarity,image artifacts,and antideformation ability of the two sequences,repectively.Results The SNR and CNR of the iShim-DWI sequence were significantly higher than those of RESOLVE-DWI sequence(P＜0.01).While the subjective scores of lesion clarity,image artifacts,and antideformation ability on RESOLVE-DWI were significantly better than those of iShim-DWI,and the differences were statistically significant(P＜0.01).Conclusion Both RESOLVE-DWI and iShim-DWI obtained good images.With sufficient SNR and CNR,RESOLVE-DWI has clearer lesions and surrounding structures,higher image resolution,fewer artifacts,and better antideformation ability,thus providing clinical advantages in evaluating patients with good physical tolerance.

Objective To investigate the clinical and CT findings features of nonaneurysmal perimesencephalic subarachnoid hem-orrhage(NAPSAH).Methods A retrospective analysis was conducted on 19 cases of NAPSAH confirmed by clinical treatment and follow-up,and their clinical and CT findings features were summarized.Results All patients exhibited mild clinical symptoms and had a good prognosis without complications.The sites of NAPSAH involved the anterior cistern in 17 cases,the suprasellar cistern in 8 cases,the interpeduncular cistern in 7 cases,the anterior cistern only in 1 case,and the suprasellar cistern only in 1 case;Among them,4 cases had vertebrobasilar dolichoectasia(VBD)and 3 cases had tortuous prolongation of vertebrobasilar artery.Conclusion The incidence of NAPSAH is low,the clinical symptoms are mild and good prognosis.It has typical imaging features.Most of its hemorrhage sites are confined to the anterior cistern,suprasellar cistern and interpeduncular cistern.Combining clinical and CT find-ings helpful to improve the accuracy of diagnosis.

Objective To explore the predictive value of a model established by combining MRI radiomics with clinical features for lymphovascular space invasion(LVSI)and lymph node metastasis(LNM)in early-stage cervical cancer.Methods A retrospective analysis was conducted on relevant data from 123 patients with early-stage cervical cancer confirmed by surgical pathology.They were randomly divided into training set(n=74)and testing set(n=49)in a 6∶4 ratio.The tumor regions in the T2WI-fat suppression(FS),diffusion weighted imaging(DWI),and T1WI with enhancement sequences were segmented and radiomics features were extracted.After screening and dimensionality reduction,the most relevant features were retained.The effectiveness of the model was evaluated using the area under the curve(AUC)of the receiver operating characteristic(ROC)curve.Results The combined model of MRI radiomics-clinical-MRI features had the best predictive performance for early-stage cervical cancer LVSI,with AUC of 0.848 and 0.821 in the training and testing sets,respectively.The predictive performance of various MRI radiomics models for early-stage cervical cancer LNM was superior to the clinical model.Conclusion The MRI radiomics model and clinical model have certain predictive value for early-stage cervical cancer LVSI and LNM,and the combined model performs the best.Radiomics will provide a basis for developing individualized treatment plans in clinical practice.

Objective To compare the image quality of readout-segmented diffusion weighted imaging(RESOLVE-DWI)and integrated slice-by-slice shimming diffusion weighted imaging(iShim-DWI)in patients with nasopharyngeal carcinoma.Methods A retrospective study was conducted on 26 patients with nasopharyngeal carcinoma confirmed by pathology.The imaging data included RESOLVE-DWI and iShim-DWI.The signal-to-noise ratio(SNR)and contrast-to-noise ratio(CNR)of the two sequences were compared by one deputy chief imaging technician.And two experienced radiologists used the 5-point scoring scheme to compare the lesion clarity,image artifacts,and antideformation ability of the two sequences,repectively.Results The SNR and CNR of the iShim-DWI sequence were significantly higher than those of RESOLVE-DWI sequence(P＜0.01).While the subjective scores of lesion clarity,image artifacts,and antideformation ability on RESOLVE-DWI were significantly better than those of iShim-DWI,and the differences were statistically significant(P＜0.01).Conclusion Both RESOLVE-DWI and iShim-DWI obtained good images.With sufficient SNR and CNR,RESOLVE-DWI has clearer lesions and surrounding structures,higher image resolution,fewer artifacts,and better antideformation ability,thus providing clinical advantages in evaluating patients with good physical tolerance.

Objective To investigate the influence of different contrast agent injection schemes on imaging quality in neck enhanced CT examination.Methods A total of 150 patients who underwent neck enhanced CT examination were selected and randomly divided into three groups:groups A,B,and C,with 50 cases in each group.Group A adopted individualized injection scheme,group B used three-phase dual-flow contrast agent injection scheme,and group C used measured constant-speed injection scheme,respectively.The objective and subjective evaluation methods were used to assess the image quality of cervical vessel and non-vessel structures.Results Among the three groups of contrast agent injection schemes,the CT values of group A and group B were higher than those of group C except for the aortic arch and submandibular gland in objective evaluation,and the contrast-to-noise ratio(CNR)of group A and group B except for the left common carotid artery and right common carotid artery bifurcation was higher than that of group C.In subjective evaluation,there was no statistically significant difference in image quality among the three groups(P＞0.05),and group B effectively reduced the impact of hardening artifacts.Conclusion The post-injection dual-flow contrast agent injection scheme can achieve the same enhancement effect as other injection schemes while ensuring image quality and reducing the amount of contrast agent used in the examination.

Objective To explore the factors influencing the image quality of thyroid CT and the application value of optimization schemes in reducing streak artifacts in thyroid CT examinations.Methods A retrospective review of the data of 141 patients who underwent thyroid enhanced CT examinations was conducted to analyze the factors affecting image quality.After determining the influencing factors,a self-controlled study was conducted on 48 patients who underwent thyroid CT examinations to analyze the feasibility of the optimization scheme.Results The patients'body mass index(BMI),neck circumference,pharynx-jaw angle,and pharynx-jaw angle-to-neck circumference ratio showed statistically significant differences in their impact on image quality(P<0.05).Compared to the conventional scheme,the optimization scheme showed significantly higher subjective and objective image evaluations.The optimization scheme also significantly improved the diagnostic performance of the images,with statistically significant differences(P<0.05).There was no statistically significant difference in radiation dose between the two positions(P>0.05).Conclusion The optimization scheme can effectively reduce streak artifacts in thyroid CT examinations.

Objective:To explore the protective effects of hematoma aspiration combined with hyperbaric oxygen（HBO）therapy on the brain tissue of rats after cerebral hemorrhage.Methods:A total of 40 rats were randomly divided into four groups：sham operation group，model group，operation group（hematoma aspiration），and combined treatment group（minimally invasive hematoma aspiration + HBO），with 10 rats in each group. The neurological deficits of rats in each group were scored by Longa scoring method. The water content of the brain tissue of rats in each group was detected by dry/wet weight measurement. The pathological changes in the hippocampus tissue of rats in each group were observed by H&E staining. The number of hippocampal neuronal apoptosis of rats in each group was detected by TUNEL assay. The expression levels of brain derived neurotrophic factor（BDNF）and Aquaporin-4（AQP4）in the hippocampus of rats in each group were detected by qRT-PCR and Western blotting. The protein expressions of Bax，Bcl-2，JAK2，p-JAK2，STAT3，and p-STAT3 in the brain tissue of rats in each group were detected by Western blotting.Results:Compared with the sham operation group，the model group had significantly higher nerve injury function scores and brain tissue water content，and showed brain tissue hemorrhage，cell pyknosis，enlarged intercellular space，increased glial cells，and decreased neurons；the apoptosis level of hippocampal neurons in the model group increased（ P<0.05）；the AQP4，p-JAK2，and p-STAT3 expressions in the model group increased，while the BDNF expression in the model group decreased（ P<0.05）. Compared with the model group，the operation group and the combined treatment group had lower nerve injury function scores and less brain tissue water content，and the brain tissue injury in the two groups was reduced. In both groups，the apoptosis level of hippocampal neurons decreased（ P<0.05）；the AQP4，p-JAK2，and p-STAT3 expressions decreased，while the BDNF expression increased（ P<0.05）. Compared with the operation group，the combined treatment group had significantly lower nerve injury function score and less brain water content，and its cell pyknosis，edema，and other conditions significantly subsided. In the combined treatment group，the apoptosis level of hippocampal neurons decreased（ P<0.05）；the AQP4，p-JAK2，and p-STAT3 expressions decreased，while the BDNF expression increased（ P<0.05）. Conclusion:Hematoma aspiration combined with HBO therapy has a protective effect on rat brain with injury due to cerebral hemorrhage，and the protective mechanism may be related to the inhibition of JAK2/STAT3 signaling pathway．

Objective:To explore the protective effects of hematoma aspiration combined with hyperbaric oxygen（HBO）therapy on the brain tissue of rats after cerebral hemorrhage.Methods:A total of 40 rats were randomly divided into four groups：sham operation group，model group，operation group（hematoma aspiration），and combined treatment group（minimally invasive hematoma aspiration + HBO），with 10 rats in each group. The neurological deficits of rats in each group were scored by Longa scoring method. The water content of the brain tissue of rats in each group was detected by dry/wet weight measurement. The pathological changes in the hippocampus tissue of rats in each group were observed by H&E staining. The number of hippocampal neuronal apoptosis of rats in each group was detected by TUNEL assay. The expression levels of brain derived neurotrophic factor（BDNF）and Aquaporin-4（AQP4）in the hippocampus of rats in each group were detected by qRT-PCR and Western blotting. The protein expressions of Bax，Bcl-2，JAK2，p-JAK2，STAT3，and p-STAT3 in the brain tissue of rats in each group were detected by Western blotting.Results:Compared with the sham operation group，the model group had significantly higher nerve injury function scores and brain tissue water content，and showed brain tissue hemorrhage，cell pyknosis，enlarged intercellular space，increased glial cells，and decreased neurons；the apoptosis level of hippocampal neurons in the model group increased（ P<0.05）；the AQP4，p-JAK2，and p-STAT3 expressions in the model group increased，while the BDNF expression in the model group decreased（ P<0.05）. Compared with the model group，the operation group and the combined treatment group had lower nerve injury function scores and less brain tissue water content，and the brain tissue injury in the two groups was reduced. In both groups，the apoptosis level of hippocampal neurons decreased（ P<0.05）；the AQP4，p-JAK2，and p-STAT3 expressions decreased，while the BDNF expression increased（ P<0.05）. Compared with the operation group，the combined treatment group had significantly lower nerve injury function score and less brain water content，and its cell pyknosis，edema，and other conditions significantly subsided. In the combined treatment group，the apoptosis level of hippocampal neurons decreased（ P<0.05）；the AQP4，p-JAK2，and p-STAT3 expressions decreased，while the BDNF expression increased（ P<0.05）. Conclusion:Hematoma aspiration combined with HBO therapy has a protective effect on rat brain with injury due to cerebral hemorrhage，and the protective mechanism may be related to the inhibition of JAK2/STAT3 signaling pathway．