Objective:To evaluate the imaging stability of a portable boom-type ophthalmic ultra-high-resolution optical coherence tomography (OCT) device in multiple application scenarios.Methods:The boom-type mode and handheld mode of the portable boom-type OCT and the desktop OCT were used to perform three-dimensional imaging tests on three healthy adults undergoing physical examinations at the Zhongshan Ophthalmic Center, Sun Yat-sen University as well as on OEMI-7 model eyes in a sitting position.The same two modes of the portable boom-type OCT were used to perform three-dimensional imaging on four awake non-sedated infants, two sedated infants and four healthy adults in the supine position.The obtained 3D imaging data were processed using a correlation analysis method between adjacent B-scans, and the offset of B-scan in the axial (z-axis) and the fast axis transverse (x-axis) were calculated.The procedures for in vivo human eye experiments followed the Declaration of Helsinki and were approved by the Ethics Committee of Zhongshan Ophthalmic Center, Sun Yat-sen University (No.2020 KYPJ154).All subjects and infant guardians signed the informed consent form. Results:Compared with the handheld imaging mode, the axial and fast axis lateral motion offsets of the model eye were significantly reduced in the boom-type imaging mode from (124.00±12.49)μm to (48.00±15.87)μm and from (24.00±1.00)μm to (2.67±0.57)μm, respectively ( t=2.932, 4.337; both P<0.001).In both human and model eyes, the axial and fast axis lateral motion offsets of the boom-type mode were significantly lower than in the traditional handheld operation mode (both P<0.001).The axial and lateral motion offsets between the boom-type mode and desk-top OCT imaging were comparable, without significant differences (both P>0.05).In both sedated and awake, non-sedated infants in the supine position, the axial offset of the portable boom-type OCT system was similar to that of the healthy adults, without significant difference in the overall comparison ( P=0.385), and the lateral offsets were higher than those of healthy adults, with statistically significant differences (both P=0.013).There was no significant difference in axial deviation between sedated and non-sedated infants ( P>0.05).The lateral deviation of non-sedated infants was higher than that of sedated infants, though the difference was not statistically significant ( P=0.247). Conclusions:The portable boom-type OCT system can maintain high-speed, high-resolution imaging performance while achieving imaging stability comparable to traditional desktop OCT systems.It is more suitable for bedside imaging of supine subjects, especially uncooperative infants, and has good clinical application prospects.

Objective To study the latent classification of medical service utilization behaviors among middle-aged and older chronic disease patients,providing a theoretical basis for the allocation of medical resources.Methods Using data from the 2018 China Health and Retirement Longitudinal Study(CHARLS)database,latent class analysis was employed to conduct subgroup analysis on the medical choice preferences of middle-aged and older chronic disease patients.Logistic regression was used to analyze the influence of various factors on medical preference subgroups.Results The medical choice preferences of middle-aged and older chronic disease patients were classified into three latent subgroups:public hospital treatment preference type,non-public hospital treatment preference type,and public hospital consultation preference type.Compared to the public hospital treatment preference type,patients under 60 years old(OR=0.456,P=0.034),those living in rural areas(OR=0.256,P=0.006),and those with smoking habits(OR=3.11,P＜0.001)were more inclined to choose non-public hospitals for treatment.In contrast,patients over 60 years old(OR=1.916,P=0.015),those with an education level of primary school or above(OR=2.595,P=0.004),and those with smoking habits(OR=2.591,P=0.044)tended to choose public hospitals for consultation or physical examinations.Conclusion Currently,private hospitals play an increasingly prominent role in chronic disease treatment.However,the utilization rate of traditional Chinese medicine among middle-aged and older chronic disease pa-tients is relatively low,and health awareness remains weak.It is recommended to strengthen the regulation of private hospitals,enhance the credibility and accessibility of traditional Chinese medicine,and intensify health education in communities to meet the growing health demands of middle-aged and older chronic disease patients.

Objective:To evaluate the imaging stability of a portable boom-type ophthalmic ultra-high-resolution optical coherence tomography (OCT) device in multiple application scenarios.Methods:The boom-type mode and handheld mode of the portable boom-type OCT and the desktop OCT were used to perform three-dimensional imaging tests on three healthy adults undergoing physical examinations at the Zhongshan Ophthalmic Center, Sun Yat-sen University as well as on OEMI-7 model eyes in a sitting position.The same two modes of the portable boom-type OCT were used to perform three-dimensional imaging on four awake non-sedated infants, two sedated infants and four healthy adults in the supine position.The obtained 3D imaging data were processed using a correlation analysis method between adjacent B-scans, and the offset of B-scan in the axial (z-axis) and the fast axis transverse (x-axis) were calculated.The procedures for in vivo human eye experiments followed the Declaration of Helsinki and were approved by the Ethics Committee of Zhongshan Ophthalmic Center, Sun Yat-sen University (No.2020 KYPJ154).All subjects and infant guardians signed the informed consent form. Results:Compared with the handheld imaging mode, the axial and fast axis lateral motion offsets of the model eye were significantly reduced in the boom-type imaging mode from (124.00±12.49)μm to (48.00±15.87)μm and from (24.00±1.00)μm to (2.67±0.57)μm, respectively ( t=2.932, 4.337; both P<0.001).In both human and model eyes, the axial and fast axis lateral motion offsets of the boom-type mode were significantly lower than in the traditional handheld operation mode (both P<0.001).The axial and lateral motion offsets between the boom-type mode and desk-top OCT imaging were comparable, without significant differences (both P>0.05).In both sedated and awake, non-sedated infants in the supine position, the axial offset of the portable boom-type OCT system was similar to that of the healthy adults, without significant difference in the overall comparison ( P=0.385), and the lateral offsets were higher than those of healthy adults, with statistically significant differences (both P=0.013).There was no significant difference in axial deviation between sedated and non-sedated infants ( P>0.05).The lateral deviation of non-sedated infants was higher than that of sedated infants, though the difference was not statistically significant ( P=0.247). Conclusions:The portable boom-type OCT system can maintain high-speed, high-resolution imaging performance while achieving imaging stability comparable to traditional desktop OCT systems.It is more suitable for bedside imaging of supine subjects, especially uncooperative infants, and has good clinical application prospects.

Objective To study the latent classification of medical service utilization behaviors among middle-aged and older chronic disease patients,providing a theoretical basis for the allocation of medical resources.Methods Using data from the 2018 China Health and Retirement Longitudinal Study(CHARLS)database,latent class analysis was employed to conduct subgroup analysis on the medical choice preferences of middle-aged and older chronic disease patients.Logistic regression was used to analyze the influence of various factors on medical preference subgroups.Results The medical choice preferences of middle-aged and older chronic disease patients were classified into three latent subgroups:public hospital treatment preference type,non-public hospital treatment preference type,and public hospital consultation preference type.Compared to the public hospital treatment preference type,patients under 60 years old(OR=0.456,P=0.034),those living in rural areas(OR=0.256,P=0.006),and those with smoking habits(OR=3.11,P＜0.001)were more inclined to choose non-public hospitals for treatment.In contrast,patients over 60 years old(OR=1.916,P=0.015),those with an education level of primary school or above(OR=2.595,P=0.004),and those with smoking habits(OR=2.591,P=0.044)tended to choose public hospitals for consultation or physical examinations.Conclusion Currently,private hospitals play an increasingly prominent role in chronic disease treatment.However,the utilization rate of traditional Chinese medicine among middle-aged and older chronic disease pa-tients is relatively low,and health awareness remains weak.It is recommended to strengthen the regulation of private hospitals,enhance the credibility and accessibility of traditional Chinese medicine,and intensify health education in communities to meet the growing health demands of middle-aged and older chronic disease patients.