1.Preparation,characterization and quantitative analysis of β-cyclodextrin inclusion complex with volatile oil from Qianghuo qushi qingwen granules
Yicheng SUN ; Lingrui QIN ; Kaiping ZOU ; Chenguang ZHAO ; Li DOU ; Shun LIU ; Lingang ZHAO
China Pharmacy 2026;37(6):746-751
OBJECTIVE To prepare the β -cyclodextrin ( β -CD) inclusion complex with volatile oil from Qianghuo qushi qingwen granules, and to characterize and quantitatively analyze the inclusion complex. METHODS The comprehensive scores calculated by inclusion rate and inclusion compound yield were used as indicators for screening the inclusion method. The single-factor experiments and Box-Behnken response surface experiments were used to op timize the inclusion conditions, with the above comprehensive score as response value, and taking the ratio of β -CD to volatile oil, inclusion temperature and inclusion time as indexes. The volatile oil inclusion complex of Qianghuo qushi qingwen granules was prepared according to the determined optimal process, followed by validation. Ultraviolet (UV)-visible spectroscopy, thin-layer chromatography (TLC), and microscopic imaging were also performed. Ultra-high performance liquid chromatography was used to determine the contents of perillaldehyde, pogostone and atractylodin. RESULTS The saturation aqueous solution method was adopted. The optimal inclusion process conditions were as follows: the ratio of β -CD to volatile oil was 7.5∶1, the inclusion temperature was 40 ℃, and the inclusion time was 2.2 h. In three verification experiments, the average inclusion rate was 72.32%, the average yield of inclusion compound was 74.45%, the average comprehensive score was 72.96 points, and the relative error with the predicted value (74.15 points) of the model was 1.61%. UV-visible spectroscopy, TLC and microscopic imaging showed that β -CD and volatile oil successfully formed a new inclusion complex. The average contents of perillaldehyde, pogostone and atractylodin were 4.498 2, 0.814 9, 0.905 7 mg/g, respectively, with RSDs of 0.31%, 0.56% and 0.63% ( n =3). CONCLUSIONS A stable and feasible preparation process of the volatile oil inclusion complex of Qianghuo qushi qingwen granules is successfully established.
2.Clinical characteristics and genetic analysis of 22 Chinese pedigrees affected with Neurofibromatosis type I.
Bingjie HU ; Xianhong DING ; Yang LU ; Hongliang CHEN ; Shuaishuai CHEN ; Mengyi XU ; Yicheng FANG ; Bo SHEN
Chinese Journal of Medical Genetics 2026;43(1):19-30
OBJECTIVE:
To explore the genetic variants and phenotypic characteristics of patients with Neurofibromatosis type I (NF1).
METHODS:
Twenty two NF1 patients who presented at Enze Medical (Center) Group in Taizhou between 2018 and 2024 were selected as the study subjects. Clinical phenotype and family history were collected for the patients. Whole exome sequencing (WES) was carried out for the 22 probands to screen the variants of NF1 gene. Candidate variants were verified by Sanger sequencing of their family members. This study was approved by the Medical Ethics Committee of the Hospital (Ethics No.: K20230902).
RESULTS:
The 22 probands were diagnosed between the age of 5 months to 47 years old, and have all shown cafe au lait spots on their skin. Seventeen patients exhibited the phenotype at birth, and 11 had various degrees of neurofibromatosis. Among them, probands 1 and 13 underwent surgical resection of the tumor but had recurred, while proband 12 had amputation due to the huge size and serious impact of the neurofibroma and had no recurrence. Five patients had various degrees of scoliosis. In total 22 germline mutations and one somatic mutation were identified among the 22 families, with 5 variants unreported previously, including 1 nonsense mutation c.1603C>T (Q535*), 3 frameshift mutations [c.7268_7269delCA (Thr2423fs), c.2293del (Arg765Alafs*26), and c.5433_5438delinsGC (Phe1812ArgfsTer50)], and 1 deletion involving exons 41-44 of the NF1 gene and adjacent introns. Proband 13 was found to harbor germline mutation c.6796C>T (Gln2266Ter) and somatic mutation c.1019_1020del (Ser340Cysfs Ter12) in the peripheral blood and tumor tissue, respectively. Among the 22 NF1 probands, 6 had received treatment due to severe illness. Proband 1 had tumor resection in the right upper limb, but was found to have malignant lung tumor and died during follow-up. Proband 12 had multiple recurrence of neurofibroma in the left ring finger. Proband 4 underwent spinal correction surgery due to severe scoliosis. Proband 11 had died due to a central nervous system disease. Among the 22 germline mutations, 6 had led to the occurrence of truncated proteins, which may have a more severe impact on the phenotype.
CONCLUSION
This study investigated the genetic variants and clinical phenotypes of 22 NF1 families and identified 5 novel variants of the NF1 gene, which has expanded the genotypic and phenotypic spectra of the NF1. Preliminary studies have identified an association between truncated mutations, young age, and severe phenotypes, which may provide important clues for prognosis evaluation. For the clinical diagnosis and treatment of NF1, it is necessary to consider the phenotypic characteristics and genetic testing in combination with genetic counseling and long-term follow-up.
Humans
;
Neurofibromatosis 1/pathology*
;
Male
;
Female
;
Pedigree
;
Adult
;
Child
;
Child, Preschool
;
Middle Aged
;
Adolescent
;
Infant
;
Young Adult
;
Neurofibromin 1/genetics*
;
Phenotype
;
Asian People/genetics*
;
Mutation
;
Exome Sequencing
;
East Asian People
3.Effect of exercise on cancer patients with anxiety and depression during chemotherapy: a meta-analysis
Yicheng YANG ; Dandan WANG ; Qunce SHEN ; Lei ZHANG ; Xueping WU
Chinese Journal of Rehabilitation Theory and Practice 2025;31(2):184-193
ObjectiveTo explore the effect of exercise on anxiety and depression in cancer patients during chemotherapy, as well as the optimal exercise dosage. MethodsA PICO framework was constructed, and randomized controlled trials (RCTs) on the effect of exercise on anxiety and depression in cancer patients during chemotherapy were retrieved from databases of PubMed, Web of Science, Cochrane Library, Embase, Medline, CNKI, VIP and Wanfang data, from the establishment to November, 2023. The quality of the literature was evaluated with Cochrane Risk of Bias Tool and Physiotherapy Evidence Database (PEDro) scale. Data were synthesized and analyzed using RevMan 5.3, and the risk of bias was evaluated using Stata 18.0. ResultsA total of 13 RCTs involving 1 340 subjects were included. The scores of PEDro scale were five to eight. Exercise interventions significantly improved anxiety (SMD = -0.70, 95%CI -1.18 to -0.22, P = 0.004) and depression (SMD = -0.89, 95%CI -1.43 to -0.34, P = 0.002) compared to the control group. Subgroup analyses showed that, the exercise effect on anxiety was less than 45 minutes a time (SMD = -0.26, 95%CI -0.46 to -0.05, P = 0.01), more than three times a week (SMD = -0.26, 95%CI -0.46 to -0.05, P = 0.01), and less than twelve weeks (SMD = -0.21, 95%CI -0.36 to -0.07, P = 0.005). For depression, it was less than 45 minutes a time (SMD = -0.69, 95%CI -1.29 to -0.08, P = 0.03), more than three times a week (SMD = -0.69, 95%CI -1.29 to -0.08, P = 0.03), and less than twelve weeks (SMD = -0.52, 95%CI -0.92 to -0.13, P = 0.01). Moderate to high-intensity exercise interventions significantly outperformed the control group in improving anxiety (SMD = -0.21, 95%CI -0.37 to -0.06, P = 0.007) and depression (SMD = -0.21, 95%CI -0.41 to -0.01, P = 0.04). ConclusionExercise interventions can effectively improve anxiety and depression in cancer patients during chemotherapy, and it suggests for high-intensity exercise, less than 45 minutes a time, more than three times a week, and less than twelve weeks.
4.Digital-Intellectualized Upgrade and Clinical Application of National Rare Diseases Registry System of China
Jian GUO ; Ye JIN ; Peng LIU ; Dingding ZHANG ; Limeng CHEN ; Yicheng ZHU ; Shuyang ZHANG
JOURNAL OF RARE DISEASES 2025;4(1):54-60
Since its establishment in 2016, the National Rare Diseases Registry System of China (NRDRS) has accumulated valuable case data and bio-specimen for basic and clinical research on rare diseases in China. However, the emerging challenges in clinical diagnosis and treatment of rare diseases make it unable for data and resource platform to fully meet the diversified needs. Under this backdrop, we have developed a protocol to optimize and upgrade the system based on the core functions of the NRDRS platform. The goal is to leverage intelligent digital technologies to transform NRDRS into a new platform integrating multimodal data and auxiliary diagnostic and treatment functions. It is specified as the development and construction of "one platform and four intelligent tools." Currently, we have upgraded and developed NRDRS platform, intelligent tool for genotype-phenotype analysis of rare diseases, AI-assisted diagnostic tool for rare diseases, remote multidisciplinary diagnosis and teaching tool for rare diseases, drug screening and validation tool for rare diseases. The next step will focus on the promotion of the application of these tools in clinical settings in order to address the issue of severe imbalance in the allocation of resources for the diagnosis and treatment of rare diseases. This article provides an overview of the digital and intelligent upgrades of the NRDRS, the trials in applications in clinical settings, and direction in the future.
5.Characterization of the shared microbial profile between infected extraction socket and maxillary sinus in patients with odontogenic maxillary sinusitis
LU Chang ; QIN Yicheng ; WANG Ye ; XU Min ; LIN Jiang
Journal of Prevention and Treatment for Stomatological Diseases 2025;33(12):1041-1052
Objective:
To explore whether infected granulation tissue in tooth extraction sockets and maxillary sinus pus share a common microbial profile at the subspecies-strain level in patients with odontogenic maxillary sinusitis (OMS), providing evidence for infection origin tracing and precise antimicrobial therapy in OMS.
Methods:
This study was reviewed and approved by the institutional ethics committee. Nine consecutive OMS patients who underwent synchronous endoscopic sinus surgery and tooth extraction from October 2020 to August 2022 were prospectively enrolled. Under general anesthesia, paired specimens were collected from infected extraction-socket granulation tissue and maxillary sinus pus. Bacterial DNA was extracted, and the full-length 16S rRNA gene was sequenced on the Illumina MiSeq platform. Amplicon sequence variants (ASVs) were generated using the DADA2 algorithm and taxonomically annotated to the subspecies level against the Human Oral Microbiome Database. The detection rate of shared ASVs between the two sites and their relative abundance in sinus pus were compared. Functional profiles were predicted using Phylogenetic Investigation of Communities by Reconstruction of Unobserved States 2 (PICRUSt2).
Results:
Shared ASVs were identified in seven of the nine patients. Fusobacterium, Parvimonas, Porphyromonas, and Prevotella were the most prevalent genera. Porphyromonas gingivalis and Fusobacterium nucleatum were co-detected in multiple patients, with relative abundances exceeding 5% in sinus pus of several cases. Identical ASVs of F. nucleatum or Porphyromonas spp. were detected in six patients; the ASVs corresponding to F. nucleatum subsp. nucleatum and Porphyromonas endodontalis were significantly more abundant in sinus pus than in extraction-socket granulation tissue. PICRUSt2 functional profiling revealed that the proportion of socket-derived microbes in sinus pus was strongly correlated with 10 pathways, including ferroptosis, adipocytokine signaling, and apoptosis, et al. Except for biotin metabolism, the remaining pathways showed weak correlation with the proportion of extraction socket-derived ASVs in the extraction-socket granulation tissue and maxillary sinus pus. Removing F. nucleatum ASVs markedly attenuated these associations
Conclusion
At the subspecies-strain level, this study confirmed the presence of a shared microbial profile between infected extraction-socket granulation tissue and maxillary sinus pus in patients with odontogenic maxillary sinusitis. The co-detected subspecies-strains with high relative abundance in maxillary sinus pus included Fusobacterium nucleatum subsp. nucleatum and Porphyromonas endodontalis, thus providing strain-level microbiological evidence for infection source tracing in OMS.
6.Effect of heat-sensitive moxibustion at "Feishu" (BL13) on immunoinflammatory response in allergic rhinitis rats based on PI3K/AKT signaling pathway.
Yicheng LI ; Jun XIONG ; Meng LIN ; Han HU ; Lijun YAO
Chinese Acupuncture & Moxibustion 2025;45(7):957-966
OBJECTIVE:
To observe the effect of heat-sensitive moxibustion at "Feishu" (BL13) on immunoinflammatory response in rats with allergic rhinitis (AR) based on phosphatidylinositol 3-kinase (PI3K)/protein kinase B (AKT) signaling pathway, so as to explore its underlying mechanism.
METHODS:
Thirty-two male SD rats were randomly divided into a blank group (6 rats) and a modeling group (26 rats). In the modeling group, AR model was prepared using systemic and local attack sensitization method with ovalbumin. The successfully-modeled rats were randomized into a model group (6 rats), a medication group (6 rats) and a moxibustion group (14 rats). In the moxibustion group, the suspending moxibustion was operated at bilateral "Feishu" (BL13), 40 min each time, once daily, for 21 consecutive days; during which, the temperature of the body and tail was recorded. During intervention, if the temperature of the body and tail increased by >1 ℃, the heat-sensitive reaction at the point was determined in the rats of the moxibustion group, and these rats were collected in a heat-sensitive moxibustion group (8 rats involved and 6 rats of them were randomly collected to ensure the sample-size consistency); and those without heat-sensitive moxibustion reaction were assigned to a traditional moxibustion group (6 rats). In the medication group, fluticasone propionate nasal spray was applied, 8 μL on each side, once daily and for 21 days. The behavioral score for AR symptoms after modeling and intervention, and the content of serum immunoglobulin E (IgE) after modeling were observed. After intervention, the histological morphology of the nasal mucosa was observed using HE staining, the positive expression of thymic stromal lymphopoietin (TSLP) in the nasal mucosa was detected using immunohistochemistry, the levels of IgE, interleukin (IL)-4, IL-5, IL-13 and interferon-γ (IFN-γ) were detected by ELISA, and the protein expression of the member 4 of tumor necrosis factor receptor superfamily (OX40), phosphorylated protein kinase B (p-AKT), phosphorylated phosphatidylinositol 3-kinase (p-PI3K) in nasal mucosa was detected by Western blotting.
RESULTS:
After modeling, the behavioral score of AR symptoms and serum IgE level in the modeling group were higher than those of the blank group (P<0.01), suggesting the success of AR modeling. After intervention, compared with the blank group, the behavioral score of AR symptoms was increased (P<0.01);the nasal mucosa structure was disordered, the inflammatory infiltration was severe; the positive expression of TSLP in the nasal mucosa increased (P<0.01), the levels of serum IgE, IL-4, IL-5, and IL-13 elevated (P<0.01), and the level of IFN-γ decreased (P<0.01); and the protein expression of OX40, p-AKT, and p-PI3K in the nasal mucosa increased (P<0.05) in the model group. Compared with the model group, the behavioral score of AR symptoms was reduced (P<0.01); the nasal mucosa structure, inflammatory infiltration, and vascular dilation were ameliorated to varying degrees; the positive expression of TSLP in the nasal mucosa decreased (P<0.01); the content of serum IgE, IL-4, IL-5, and IL-13 decreased (P<0.05), and that of IFN-γ increased (P<0.05) in the medication, traditional moxibustion, and heat-sensitive moxibustion groups. Compared with the model group, the protein expression of p-AKT was reduced in the medication and traditional moxibustion groups (P<0.05), the protein expression of OX40, p-AKT, and p-PI3K in the nasal mucosa decreased in the heat-sensitive moxibustion group (P<0.05). When compared with the medication group, the positive expression of TSLP in the nasal mucosa was reduced (P<0.05) in the heat-sensitive moxibustion group. In comparison with the traditional moxibustion group, the content of serum IL-13 was reduced and the content of IFN-γ elevated in the heat-sensitive moxibustion and the medication groups (P<0.05), the protein expression of p-PI3K reduced in the medication group (P<0.05), and the positive expression of TSLP and the protein expression of OX40 and p-PI3K in the nasal mucosa were reduced in the heat-sensitive moxibustion group (P<0.05).
CONCLUSION
Heat-sensitive moxibustion at "Feishu" (BL13) can alleviate the symptoms of AR rats, ameliorate the inflammatory infiltration and telangiectasia of nasal mucosa, and inhibit immunoinflammatory response, which may be obtained by regulating PI3K/AKT signal pathway.
Animals
;
Moxibustion
;
Male
;
Rats
;
Signal Transduction
;
Rats, Sprague-Dawley
;
Rhinitis, Allergic/genetics*
;
Proto-Oncogene Proteins c-akt/immunology*
;
Acupuncture Points
;
Humans
;
Phosphatidylinositol 3-Kinases/immunology*
;
Phosphatidylinositol 3-Kinase/immunology*
7.Inflammatory disorders that affect the cerebral small vessels.
Fei HAN ; Siyuan FAN ; Bo HOU ; Lixin ZHOU ; Ming YAO ; Min SHEN ; Yicheng ZHU ; Joanna M WARDLAW ; Jun NI
Chinese Medical Journal 2025;138(11):1301-1312
This comprehensive review synthesizes the latest advancements in understanding inflammatory disorders affecting cerebral small vessels, a distinct yet understudied category within cerebral small vessel diseases (SVD). Unlike classical SVD, these inflammatory conditions exhibit unique clinical presentations, imaging patterns, and pathophysiological mechanisms, posing significant diagnostic and therapeutic challenges. Highlighting their heterogeneity, this review spans primary angiitis of the central nervous system, cerebral amyloid angiopathy-related inflammation, systemic vasculitis, secondary vasculitis, and vasculitis in autoinflammatory diseases. Key discussions focus on emerging insights into immune-mediated processes, neuroimaging characteristics, and histopathological distinctions. Furthermore, this review underscores the importance of standardized diagnostic frameworks, individualized immunomodulation approaches, and novel targeted therapies to address unmet clinical demands.
Humans
;
Cerebral Small Vessel Diseases/pathology*
;
Inflammation/pathology*
;
Cerebral Amyloid Angiopathy/pathology*
;
Vasculitis, Central Nervous System/pathology*
;
Vasculitis/pathology*
8.Analgesic effect of "cocktail" analgesia containing high-dose compound betamethasone after revision hip arthroplasty and the use of opioid drugs.
Ning YANG ; Wulamu WUHUZI ; Xiaobin GUO ; Yicheng LI ; Xiaogang ZHANG
Chinese Journal of Reparative and Reconstructive Surgery 2025;39(3):314-319
OBJECTIVE:
To investigate the analgesic effect of locally injecting a "cocktail" analgesia containing a high-dose compound betamethasone during revision hip arthroplasty, and also to study the usage of opioid drugs.
METHODS:
A retrospective analysis was conducted on the clinical data of 180 patients who underwent revision hip arthroplasty due to aseptic loosening of the hip prosthesis between January 2015 and December 2021. Among them, 95 patients received intraoperative injection of "cocktail" analgesia containing high-dose compound betamethasone (group A), and 85 patients received intraoperative injection of traditional "cocktail" analgesia (group B). There was no significant difference in baseline data such as gender, age, body mass index, presence or absence of diabetes mellitus between the two groups ( P>0.05). The hospital stay, use of opioid drugs within 72 hours, and the incidence of adverse reactions within 72 hours after operation [including nausea and vomiting, insomnia, deep venous thrombosis (DVT), infection, etc.] were recorded and compared between the two groups. The pain relief of patients was evaluated using the static and dynamic visual analogue scale (VAS) scores at 12, 24, 48, and 72 hours after operation. The incidence of complications (including prosthesis re-loosening, hip joint dislocation, hip joint stiffness, limping, chronic pain, etc.) at 2 years after operation was recorded, and the Harris Hip Score (HHS) was used to evaluate the function at 2 years after operation.
RESULTS:
In group A, the utilization rate of opioid drugs within 72 hours after operation was significantly lower than that in group B ( P<0.05). However, there was no significant difference between the two groups in terms of hospital stay, as well as the incidence of adverse reactions such as nausea and vomiting, insomnia, DVT, and infection within 72 hours after operation ( P>0.05). The VAS scores of both groups decreased with time, and the differences between different time points were significant ( P<0.05). The static and dynamic VAS scores of group A were significantly lower than those of group B at 12, 24, and 48 hours after operation ( P<0.05), but there was no significant difference in static and dynamic VAS scores between the two groups at 72 hours after operation ( P>0.05). All patients in both groups were followed up 2-8 years, with an average of 5.73 years. At 2 years after operation, no significant difference was found between the two groups in the incidence of complications and HHS score ( P>0.05).
CONCLUSION
"Cocktail" analgesia containing a high-dose compound betamethasone for early analgesia after revision hip arthroplasty can effectively reduce postoperative pain and the use of opioid drugs, but will not increase the incidence of infection and DVT after operation.
Humans
;
Arthroplasty, Replacement, Hip/adverse effects*
;
Betamethasone/therapeutic use*
;
Retrospective Studies
;
Male
;
Female
;
Analgesics, Opioid/administration & dosage*
;
Pain, Postoperative/prevention & control*
;
Middle Aged
;
Reoperation
;
Aged
;
Analgesia/methods*
;
Adult
;
Pain Measurement
;
Pain Management/methods*
;
Prosthesis Failure
;
Hip Prosthesis
9.Effectiveness of three-dimensional-printed microporous titanium prostheses combined with flap implantation in treatment of large segmental infectious bone defects in limbs.
Yongqing XU ; Xinyu FAN ; Teng WANG ; Shaoquan PU ; Xingbo CAI ; Xiangwen SHI ; Wei LIN ; Xi YANG ; Jian LI ; Min LIU
Chinese Journal of Reparative and Reconstructive Surgery 2025;39(5):521-528
OBJECTIVE:
To analyze the effectiveness of single three-dimensional (3D)-printed microporous titanium prostheses and flap combined prostheses implantation in the treatment of large segmental infectious bone defects in limbs.
METHODS:
A retrospective analysis was conducted on the clinical data of 76 patients with large segmental infectious bone defects in limbs who were treated between January 2019 and February 2024 and met the selection criteria. Among them, 51 were male and 25 were female, with an age of (47.7±9.4) years. Of the 76 patients, 51 had no soft tissue defects (single prostheses group), while 25 had associated soft tissue defects (flap combined group). The single prostheses group included 28 cases of tibial bone defects, 11 cases of femoral defects, 5 cases of humeral defects, 4 cases of radial bone defects, and 3 cases of metacarpal, or carpal bone defects, with bone defect length ranging from 3.5 to 28.0 cm. The flap combined group included 3 cases of extensive dorsum of foot soft tissue defects combined with large segmental metatarsal bone defects, 19 cases of lower leg soft tissue defects combined with large segmental tibial bone defects, and 3 cases of hand and forearm soft tissue defects combined with metacarpal, carpal, or radial bone defects, with bone defect length ranging from 3.8 to 32.0 cm and soft tissue defect areas ranging from 8 cm×5 cm to 33 cm×10 cm. In the first stage, vancomycin-loaded bone cement was used to control infection, and flap repair was performed in the flap combined group. In the second stage, 3D-printed microporous titanium prostheses were implanted. Postoperative assessments were performed to evaluate infection control and bone integration, and pain release was evaluated using the visual analogue scale (VAS) score.
RESULTS:
All patients were followed up postoperatively, with an average follow-up time of (35.2±13.4) months. In the 61 lower limb injury patients, the time of standing, walk with crutches, and fully bear weight were (2.2±0.6), (3.9±1.1), and (5.4±1.1) months, respectively. The VAS score at 1 year postoperatively was significantly lower than preoperative one ( t=-10.678, P<0.001). At 1 year postoperatively, 69 patients (90.8%) showed no complication such as infection, fracture, prosthesis displacement, or breakage, and X-ray films indicated good integration at the prosthesis-bone interface. According to the Paley scoring system for the healing of infectious bone defects, the results were excellent in 37 cases, good in 29 cases, fair in 3 cases, and poor in 7 cases. In the single prostheses group, during the follow-up, there was 1 case each of femoral prostheses fracture, femoral infection, and tibial infection, with a treatment success rate of 94.1% (48/51). In lower limb injury patients, the time of fully bear weight was (5.0±1.0) months. In the flap combined group, during the follow-up, 1 case of tibial fixation prostheses screw fracture occurred, along with 2 cases of recurrent foot infection in diabetic patients and 1 case of tibial infection. The treatment success rate was 84.0% (21/25). The time of fully bear weight in lower limb injury patients was (5.8±1.2) months. The overall infection eradication rate for all patients was 93.4% (71/76).
CONCLUSION
The use of 3D-printed microporous titanium prostheses, either alone or in combination with flaps, for the treatment of large segmental infectious bone defects in the limbs results in good effectiveness with a low incidence of complications. It is a feasible strategy for the reconstruction of infectious bone defects.
Humans
;
Male
;
Female
;
Middle Aged
;
Printing, Three-Dimensional
;
Titanium
;
Retrospective Studies
;
Surgical Flaps
;
Adult
;
Prosthesis Implantation/methods*
;
Plastic Surgery Procedures/methods*
;
Treatment Outcome
;
Prostheses and Implants
;
Bone Diseases, Infectious/surgery*
;
Extremities/surgery*
;
Prosthesis Design
10.Research on MRI Gradient Coil Magnetic Field Induced Eddy Current Method.
Xiaotao ZHANG ; Yicheng LI ; Zhanping ZHENG ; Mingke WANG ; Like FENG ; Congbo LI
Chinese Journal of Medical Instrumentation 2025;49(3):263-268
After the production of the gradient coil of the magnetic resonance imaging system, electromagnetic field testing is required to verify whether the assembly accuracy meets the electromagnetic field requirements. Since the passive magnetic field B z satisfies the Laplace ,s equation and is a harmonic function, and according to the extreme value principle of harmonic function, the maximum or minimum values of B z can only appear on the boundaries, so the observation points of the magnetic field are generally selected on the surface of the spherical imaging area. For superconducting magnets used for human body magnetic resonance imaging, a spherical area with a center diameter of 40~50 cm is generally selected as the shimming target area. Only the field value of the target area needs to be measured, and the spherical harmonic coefficients obtained after data processing are used to determine the magnetic field performance of the gradient coil. There are many testing principles and methods for electromagnetic fields, so there is no unified way and method in the field of commercial applications. This article is based on the Gauss-Legendre numerical integration, measures and analyzes the magnetic field performance of gradient coils by building a data acquisition system, and this article applies numerical analysis methods to calculate the spherical harmonic coefficients of the magnetic field using discrete test data, providing a feasible method for the production and testing of gradient coils.
Magnetic Resonance Imaging/methods*
;
Magnetic Fields
;
Electromagnetic Fields
;
Equipment Design


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