Objective:To compare the treatment time stability, inter- and intra-fraction errors, and clinical target volume (CTV) to planning target volume (PTV) margin expansions under different gated window settings in deep inspiration breath hold (DIBH) radiotherapy for breast cancer, and to analyze the correlation between organ at risk (OAR) dose optimization and changes in lung volume.Methods:A retrospective analysis was conducted on 65 patients with left-sided breast cancer who received DIBH radiotherapy after modified radical mastectomy. CT simulation positioning was performed using 2 mm or 3 mm gated window for DIBH, followed by target delineation, treatment planning, and dose verification. During treatment, setup errors guided by cone beam CT (CBCT), intra-fraction monitoring errors, and treatment times were recorded. The coefficient of variation (CV) of treatment time was calculated for both gated window settings. Based on inter- and intra-fraction error distributions, the expansion distance of the CTV were determined using the van Herk formula. Dosimetric differences between DIBH and free-breathing (FB) plans for the left lung, heart, and left anterior descending coronary artery (LAD) were compared. Spearman correlation analysis was performed between the relative increase in left lung volume and the relative reduction in OAR dose. Paired t-tests were used for inter-group comparisons. Results:The mean CV of the 3 mm gated window group was 0.08±0.03, which was lower than that of the 2 mm group (0.10±0.04; t=-3.91, P<0.001). The setup errors of the 2 mm group in the X, Y, and Z directions were (1.27±1.03), (1.68±0.94), (1.90±1.25) mm, respectively-significantly smaller than those of the 3 mm group [(1.81±1.41), (2.07±1.69), (2.93±1.90) mm; t=-5.80, -2.33, -5.33; P<0.001,=0.014,<0.001). Setup errors for both groups were within the 25%-75% range and all below 5 mm. The intra-fraction deviations of the 2 mm group in the X, Y, and Z directions were (0.54±0.33), (0.79±0.44), (0.70±0.53) mm, respectively, significantly smaller than those of the 3 mm group [(0.62±0.43), (0.93±0.66), (0.87±0.67) mm; t=-3.87, -3.46, -2.71,all P<0.001). The mean intra-fraction errors of both groups were within 1 mm, with greater deviations in the Y and Z directions than those in the X direction. The CTV expansion margins for the 2 mm group in the X, Y, and Z directions were 4.21, 5.35, 5.99 mm, respectively, while those for the 3 mm group were 5.81, 6.89, 9.06 mm. Compared with FB, DIBH significantly reduced the doses to the left lung, heart, and LAD (all P<0.01). The increase in left lung volume was moderately negatively correlated with the reduction in left lung D mean ( r=-0.43, P=0.028), and highly negatively correlated with the dose reductions to the heart and LAD (both P<0.001). Conclusions:The variability in respiratory gated window settings can lead to differences in treatment time stability as well as inter- and intra-fraction errors, consequently affecting CTV-to-PTV margins. The DIBH technique demonstrates significant dosimetric benefits in reducing radiation exposure to the left lung, heart, and LAD. Volumetric expansion of the left lung is strongly and inversely correlated with the reduction in radiation dose to both the heart and LAD.

Radiation-induced adverse reactions in organs at risk(OAR) is recognized as a significant factor limiting doses to clinical target volumes(CTV). Magnetic ferrite nanoparticles, distinguished by their unique physicochemical properties such as ease of modification and high biocompatibility, have been extensively investigated in the biomedical field. This article reviews the latest advances in research on the application of magnetic ferrite nanoparticles in radiotherapy, focusing on their magnetothermal effect, dose enhancement effect, promotion of ferroptosis, regulation of the cell cycle, and improvement in image-guided quality. Furthermore, this article provides an outlook for future research.

Radiation-induced adverse reactions in organs at risk(OAR) is recognized as a significant factor limiting doses to clinical target volumes(CTV). Magnetic ferrite nanoparticles, distinguished by their unique physicochemical properties such as ease of modification and high biocompatibility, have been extensively investigated in the biomedical field. This article reviews the latest advances in research on the application of magnetic ferrite nanoparticles in radiotherapy, focusing on their magnetothermal effect, dose enhancement effect, promotion of ferroptosis, regulation of the cell cycle, and improvement in image-guided quality. Furthermore, this article provides an outlook for future research.

Objective:To compare the treatment time stability, inter- and intra-fraction errors, and clinical target volume (CTV) to planning target volume (PTV) margin expansions under different gated window settings in deep inspiration breath hold (DIBH) radiotherapy for breast cancer, and to analyze the correlation between organ at risk (OAR) dose optimization and changes in lung volume.Methods:A retrospective analysis was conducted on 65 patients with left-sided breast cancer who received DIBH radiotherapy after modified radical mastectomy. CT simulation positioning was performed using 2 mm or 3 mm gated window for DIBH, followed by target delineation, treatment planning, and dose verification. During treatment, setup errors guided by cone beam CT (CBCT), intra-fraction monitoring errors, and treatment times were recorded. The coefficient of variation (CV) of treatment time was calculated for both gated window settings. Based on inter- and intra-fraction error distributions, the expansion distance of the CTV were determined using the van Herk formula. Dosimetric differences between DIBH and free-breathing (FB) plans for the left lung, heart, and left anterior descending coronary artery (LAD) were compared. Spearman correlation analysis was performed between the relative increase in left lung volume and the relative reduction in OAR dose. Paired t-tests were used for inter-group comparisons. Results:The mean CV of the 3 mm gated window group was 0.08±0.03, which was lower than that of the 2 mm group (0.10±0.04; t=-3.91, P<0.001). The setup errors of the 2 mm group in the X, Y, and Z directions were (1.27±1.03), (1.68±0.94), (1.90±1.25) mm, respectively-significantly smaller than those of the 3 mm group [(1.81±1.41), (2.07±1.69), (2.93±1.90) mm; t=-5.80, -2.33, -5.33; P<0.001,=0.014,<0.001). Setup errors for both groups were within the 25%-75% range and all below 5 mm. The intra-fraction deviations of the 2 mm group in the X, Y, and Z directions were (0.54±0.33), (0.79±0.44), (0.70±0.53) mm, respectively, significantly smaller than those of the 3 mm group [(0.62±0.43), (0.93±0.66), (0.87±0.67) mm; t=-3.87, -3.46, -2.71,all P<0.001). The mean intra-fraction errors of both groups were within 1 mm, with greater deviations in the Y and Z directions than those in the X direction. The CTV expansion margins for the 2 mm group in the X, Y, and Z directions were 4.21, 5.35, 5.99 mm, respectively, while those for the 3 mm group were 5.81, 6.89, 9.06 mm. Compared with FB, DIBH significantly reduced the doses to the left lung, heart, and LAD (all P<0.01). The increase in left lung volume was moderately negatively correlated with the reduction in left lung D mean ( r=-0.43, P=0.028), and highly negatively correlated with the dose reductions to the heart and LAD (both P<0.001). Conclusions:The variability in respiratory gated window settings can lead to differences in treatment time stability as well as inter- and intra-fraction errors, consequently affecting CTV-to-PTV margins. The DIBH technique demonstrates significant dosimetric benefits in reducing radiation exposure to the left lung, heart, and LAD. Volumetric expansion of the left lung is strongly and inversely correlated with the reduction in radiation dose to both the heart and LAD.

Objective To assess the value of magnetic resonance imaging compilation(MAGiC)sequence in predicting lympho-vascular space invasion(LVSI)in early cervical cancer.Methods The data of 48 patients with cervical cancer confirmed by pathology were collected retrospectively,and classified into LVSI-positive group(n=29)and LVSI-negative group(n=19)according to postop-erative pathological results.MAGiC sequence images of patients were obtained before injecting contrast agents,then the region of interest(ROI)was delineated along the largest dimension edge of the lesion,and T1,T2 and proton density(PD)values were automatically generated by the software.Predictors were screened by univariate analysis and receiver operating characteristic(ROC)curves were drawn to assess their diagnostic efficacy for predicting LVSI in cervical cancer.Results Significant differences were found in T1 and PD values between LVSI-positive and LVSI-negative groups(P=0.003,P=0.017).There were no significant differences in T2 values between the two groups(P=0.414).The area under the curve(AUC)for T1 and PD values to predict LVSI status were 0.73 and 0.721,respectively.Conclusion LVSI-positive group of cervical cancer has lower T1 and PD values than LVSI-negative group based on MAGiC sequence.The MAGiC sequence has a certain application value for predicting LVSI status in early cervical cancer.

In order to solve the problems in traditional health management experimental teaching, such as high cost, safety and difficult repeatability, a virtual simulation experimental teaching platform for health management combined with Traditional Chinese Medicine (TCM) characteristics has been constructed by using virtual simulation, multimedia, and human-computer interaction technologies, which comprises TCM constitution identification, TCM health management and health management service process. Through the combination of virtual simulation and reality situation, the platform has formed an online and offline model of experimental teaching, which has improved the innovation and practice ability of students and enhanced the teaching quality.

Objective:To explore the application effect of rotating skin flap in the repair of skin and soft tissue defects in the perineum.Methods:A retrospective analysis was conducted on the data of 9 patients with perineal soft tissue defects treated in the Department of the First Affiliated Hospital, Wenzhou Medical University from January 2022 to March 2024. Among them, 8 cases were soft tissue defects after extensive resection of Paget′s disease in the perineum, and 1 case was soft tissue defects after treatment of severe urethral stricture. The defect area ranged from 4 cm×1.5 cm to 30 cm×35 cm, and all wounds were repaired with rotating skin flaps, For patients with excessive area, rotating skin flaps were used to cover important areas, combined with autologous skin and artificial skin to cover the remaining wounds. Patients with urethral stricture were treated with free oral mucosal reconstruction of the urethra combined with rotational skin flap coverage. The donor site was directly sutured or autologous skin was transplanted.Results:After surgery, the recipient skin flaps of 9 patients survived and the donor area healed. After a follow-up of 9-15 months, the skin flap survived well, with skin color approaching normal, and the donor site wound healed well. Eight patients with Paget′s disease did not show any recurrence, among which one patient with extensive wound expansion had good recovery of the perineal skin flap coverage area, and small-scale chronic ulcers appeared in the skin graft area. The skin flap of the patient with urethral stricture had recovered well, and the shape of the penis was good, without any urethral stricture, urinary fistula, sinus tract, etc.Conclusions:The rotational skin flap has a clear therapeutic effect on perineal soft tissue defects and is suitable for repairing perineal skin and soft tissue defects.

Objective To observe the value of MRI for differential diagnosis of ovarian granulosa cell tumor(OGCT)and ovarian thecoma-fibroma(OTF).Methods Data of 37 females with OGCT(OGCT group)and 74 with OTF(OTF group)were retrospectively analyzed.MRI parameters were compared between groups.Multiple logistic regression analysis was performed,and the efficacy of each parameter alone and their combination for distinguishing OGCT and OTF were observed.Results Significant differences of cystic-solid classification,degree of cystic changes,the maximum diameter of cyst area of lesions,T2WI signal,enhancement degree and apparent diffusion coefficient(ADC)of the solid part of lesions,presence of honeycomb sign/cheese sign,presence of tumor blood vessels and bleeding were found between groups(all P＜0.05).Degree of cystic changes,ADC and presence of honeycomb sign/cheese sign were impact factors of MRI for distinguishing OGCT and OTF.The area under the curve(AUC)of the above three for distinguishing OGCT and OTF was 0.834,0.868 and 0.744,respectively,and of the combination was 0.934,greater than any alone(all P＜0.05).Conclusion MRI features such as degree of cystic changes,ADC and presence of honeycomb sign/cheese sign were helpful for distinguishing OGCT and OTF.

Objective To analyze the perioperative outcomes of cardiac valve surgery in patients with asymptomatic SARS-CoV-2 infection. Methods The perioperative clinical data of patients receiving heart valve replacement in the Department of Cardiovascular Surgery, the First Affiliated Hospital of University of Science and Technology of China from November 2022 to February 2023 were retrospectively analyzed. According to whether the patients were infected with SARS-CoV-2, they were divided into a non-infected group and an asymptomatic group. The perioperative data of the patients were compared between the two groups, and the effect of asymptomatic infection on the result of heart valve replacement surgery was analyzed. Results A total of 66 patients were enrolled including 36 males and 30 females with a mean age of 58.0±11.1 years. There were 51 patients in the non-infected group and 15 patients in the asymtomatic group. There were 2 patients of mitral valve replacement, 20 patients of aortic valve replacement, 1 patient of double valve replacement, 3 patients of aortic valve replacement with tricuspid valvoplasty, 22 patients of mitral valve replacement and tricuspid valvoplasty, 18 patients of double valve replacement and tricuspid valvoplasty. Asymptomatic infected patients received more emergency surgery than uninfected patients (26.7% vs. 0.0%, P<0.01). There was no statistical difference in the duration of extracorporeal circulation, aortic occlusion, mechanical ventilation time after the surgery, ICU stay, postoperative drainage volume, or postoperative complications between the two groups. Conclusion Perioperative results of cardiac valve surgery in patients with asymptomatic SARS-CoV-2 infection and non-infection are almost the same.

Objective:To explore the application and effect of scenario simulation teaching in ST-segment elevation myocardial infarction (STEMI) course for emergency training of "5+3" professional master.Methods:A randomized controlled trial was conducted among 48 "5+3" professional masters who would rotate in the emergency department, to compare the test results of the total and three scenes between scenario simulation teaching group ( n=24) and traditional teaching group ( n=24). The STEMI teaching was carried out through simulating the emergency room, standardized patients and first-aid simulators in the simulation teaching group, and the traditional teaching group was taught by conventional classroom teaching. After the class, "Theoretical Examination" and "Questionnaire Survey" were used to evaluate the teaching effect. The former was further divided into "first diagnosis and differential diagnosis of chest pain", "fast identification and processing of STEMI" and "rescue of cardiac arrest" for inter-group and intra-group evaluation. SPSS 20.0 was used to conduct t-test. Results:In the theoretical examination, the scenario simulation teaching group was superior to the traditional teaching group in the test of emergency processing for STEMI course [(82.38±2.41) vs . (68.00±1.95), t=4.64, P<0.001]. In the sub-analysis of scenario simulation teaching group, students in the role-play group had significantly higher scores than others in the non-role-play group [(90.50±3.04) vs . (79.67±2.79), t=2.09, P=0.049]. Scenario simulation teaching group was also superior to traditional teaching group in the "Questionnaire Survey". Conclusion:In the training and teaching of STEMI emergency processing, scenario simulation teaching group proves to be superior to traditional teaching, which deserves further promotion.