目的探讨超声微血流成像联合剪切波弹性成像在鉴别甲状腺超声影像报告和数据系统(thyroid imaging reporting and data system,TI-RADS)4类结节良恶性的应用价值。方法回顾性选取2021年11月至2022年12月在杭州市中医院诊断为美国放射学...目的探讨超声微血流成像联合剪切波弹性成像在鉴别甲状腺超声影像报告和数据系统(thyroid imaging reporting and data system,TI-RADS)4类结节良恶性的应用价值。方法回顾性选取2021年11月至2022年12月在杭州市中医院诊断为美国放射学会(American College of Radiology,ACR)TI-RADS 4类的114个甲状腺结节,所有结节均行超声微血流成像及剪切波弹性成像检查,并与手术病理结果对比,评估微血流成像、剪切波弹性成像及二者联合应用的诊断效能。结果114例甲状腺TI-RADS 4类结节中,良性结节35例,恶性结节79例,恶性结节微血流成像模式多为聚集中断征及穿支血管征,剪切波弹性成像Emax值对鉴别良恶性差异有统计学意义(P<0.05),并且恶性结节SWE Emax≥41.6 kPa;超声微血流成像联合剪切波弹性成像诊断甲状腺TI-RADS 4类结节的敏感度、特异性和准确性分别为96.20%、65.72%、86.84%,曲线下面积为0.810,敏感度、准确性均高于单一诊断模式,差异有统计学意义(P<0.05)。结论超声微血流成像联合剪切波弹性成像能提高甲状腺TI-RADS 4类结节的良恶性诊断效能,具有较高的诊断敏感度及准确性,有助于此类结节的无创性鉴别诊断,避免不必要的穿刺活检。展开更多
Background Mepiquat chloride(MC)application and plant population density(PPD)increasing are required for modern cotton production.However,their interactive effects on leaf physiology and carbohydrate metabolism remain...Background Mepiquat chloride(MC)application and plant population density(PPD)increasing are required for modern cotton production.However,their interactive effects on leaf physiology and carbohydrate metabolism remain obscure.This study aimed to examine whether and how MC and PPD affect the leaf morpho-physiological characteristics,and thus final cotton yield.PPD of three levels(D1:2.25 plants·m^(-2),D2:4.5 plants·m^(-2),and D3:6.75 plants·m^(-2))and MC dosage of two levels(MC0:0 g·ha^(-2),MC1:82.5 g·ha^(-2))were combined to create six treatments.The dynamics of nonstructual carbohydrate concentration,carbon metabolism-related enzyme activity,and photosynthetic attributes in cotton leaves were examined during reproductive growth in 2019 and 2020.Results Among six treatments,the high PPD of 6.75 plants·m^(-2)combined with MC application(MC1D3)exhibited the greatest seed cotton yield and biological yield.The sucrose,hexose,starch,and total nonstructural carbohydrate(TNC)concentrations peaked at the first flowering(FF)stage and then declined to a minimum at the first boll opening(FBO)stage.Compared with other treatments,MC1D3 improved starch and TNC concentration by 5.4%~88.4%,7.8%~52.0% in 2019,and by 14.6%~55.9%,13.5%~39.7% in 2020 at the FF stage,respectively.Additionally,MC1D3 produced higher transformation rates of starch and TNC from the FF to FBO stages,indicating greater carbon production and utilization efficiency.MC1D3 displayed the maximal specific leaf weight(SLW)at the FBO stage,and the highest chlorophyll a(Chl a),Chl b,and Chl a+b concentration at the mid-late growth phase in both years.The Rubisco activity with MC1D3 was 2.6%~53.2% higher at the flowering and boll setting stages in both years,and 2.4%~52.7% higher at the FBO stage in 2020 than those in other treatments.These results provided a explanation of higher leaf senescence-resistant ability in MC1D3.Conclusion Increasing PPD coupled with MC application improves cotton yield by enhancing leaf carbohydrate production and utilization efficiency and delaying leaf senescence.展开更多
文摘目的探讨超声微血流成像联合剪切波弹性成像在鉴别甲状腺超声影像报告和数据系统(thyroid imaging reporting and data system,TI-RADS)4类结节良恶性的应用价值。方法回顾性选取2021年11月至2022年12月在杭州市中医院诊断为美国放射学会(American College of Radiology,ACR)TI-RADS 4类的114个甲状腺结节,所有结节均行超声微血流成像及剪切波弹性成像检查,并与手术病理结果对比,评估微血流成像、剪切波弹性成像及二者联合应用的诊断效能。结果114例甲状腺TI-RADS 4类结节中,良性结节35例,恶性结节79例,恶性结节微血流成像模式多为聚集中断征及穿支血管征,剪切波弹性成像Emax值对鉴别良恶性差异有统计学意义(P<0.05),并且恶性结节SWE Emax≥41.6 kPa;超声微血流成像联合剪切波弹性成像诊断甲状腺TI-RADS 4类结节的敏感度、特异性和准确性分别为96.20%、65.72%、86.84%,曲线下面积为0.810,敏感度、准确性均高于单一诊断模式,差异有统计学意义(P<0.05)。结论超声微血流成像联合剪切波弹性成像能提高甲状腺TI-RADS 4类结节的良恶性诊断效能,具有较高的诊断敏感度及准确性,有助于此类结节的无创性鉴别诊断,避免不必要的穿刺活检。
基金supported by the National Natural Science Foundation of China(grant no.31960385)the Natural Science Foundation of Jiangxi,China(grant no.20212BAB215009)。
文摘Background Mepiquat chloride(MC)application and plant population density(PPD)increasing are required for modern cotton production.However,their interactive effects on leaf physiology and carbohydrate metabolism remain obscure.This study aimed to examine whether and how MC and PPD affect the leaf morpho-physiological characteristics,and thus final cotton yield.PPD of three levels(D1:2.25 plants·m^(-2),D2:4.5 plants·m^(-2),and D3:6.75 plants·m^(-2))and MC dosage of two levels(MC0:0 g·ha^(-2),MC1:82.5 g·ha^(-2))were combined to create six treatments.The dynamics of nonstructual carbohydrate concentration,carbon metabolism-related enzyme activity,and photosynthetic attributes in cotton leaves were examined during reproductive growth in 2019 and 2020.Results Among six treatments,the high PPD of 6.75 plants·m^(-2)combined with MC application(MC1D3)exhibited the greatest seed cotton yield and biological yield.The sucrose,hexose,starch,and total nonstructural carbohydrate(TNC)concentrations peaked at the first flowering(FF)stage and then declined to a minimum at the first boll opening(FBO)stage.Compared with other treatments,MC1D3 improved starch and TNC concentration by 5.4%~88.4%,7.8%~52.0% in 2019,and by 14.6%~55.9%,13.5%~39.7% in 2020 at the FF stage,respectively.Additionally,MC1D3 produced higher transformation rates of starch and TNC from the FF to FBO stages,indicating greater carbon production and utilization efficiency.MC1D3 displayed the maximal specific leaf weight(SLW)at the FBO stage,and the highest chlorophyll a(Chl a),Chl b,and Chl a+b concentration at the mid-late growth phase in both years.The Rubisco activity with MC1D3 was 2.6%~53.2% higher at the flowering and boll setting stages in both years,and 2.4%~52.7% higher at the FBO stage in 2020 than those in other treatments.These results provided a explanation of higher leaf senescence-resistant ability in MC1D3.Conclusion Increasing PPD coupled with MC application improves cotton yield by enhancing leaf carbohydrate production and utilization efficiency and delaying leaf senescence.
