Rim^(18)F-fluorodeoxyglucose uptake of hepatic cavernous hemangioma on positron emission tomography/computed tomography:A case report

BACKGROUND Peripheral FDG accumulation in a hepatic hemangioma presenting in a patient with prolonged fever is rare.Therefore,clinicians should pay close attention to patients with hepatic mass.CASE SUMMARY A 54-year-old woman with a 4-wk history of daily fevers was admitted to our hospital.A whole body^(18)-Fluordesoxyglucose(PET-FDG)positron emission tomography/computed tomography(PET/CT)was performed to elucidate the source of the fever.However,whole body^(18)-FDG PET/CT raised the suspicion of a malignant lesion because of peripheral FDG accumulation(SUVmax 3.5 g/mL)higher than that of the normal liver parenchyma(SUVmax 1.6 g/mL)surrounding a hypoactive area,and no other abnormalities were showed.Subsequently,the patient underwent liver mass resection.Histopathology showed a hepatic cavernous hemangioma with fatty infiltration around the lesion.The fever disappeared four days after surgery and the patient did not present any complications during follow-up.CONCLUSION Fatty infiltration in the peripheral parts of hepatic cavernous hemangioma may lead to subacute inflammation which further activate the Kupffer cells.This may cause prolonged fever and peripheral rim FDG accumulation on PET/CT.

^(18)F-fluorodeoxyglucose positron emission tomography in the diagnosis of small pancreatic cancer

AIM:To investigate the role of 18 F-fluorodeoxyglucose positron emission tomography(FDG-PET) in the diagnosis of small pancreatic cancer. METHODS:This study involved 31 patients with proven invasive ductal cancer of the pancreas.The patients were divided into 3 groups according to the maximum diameter of the tumor:TS1(maximum tumor size≤2.0 cm) ,TS2(>2.0 cm and≤4.0 cm) or TS3-4(>4.0 cm) .The relationships between the TS and various diagnostic tools,including FDG-PET with dual time point evaluation,were analyzed. RESULTS:The tumors ranged from 1.3 to 11.0 cm in diameter.Thirty of the 31 patients(97%) had a positive FDG-PET study.There were 5 patients classified as TS1,15 as TS2 and 11 as TS3-4.The sensitivity of FDG-PET,computed tomography(CT) and magnetic resonanceimaging(MRI) were 100%,40%,0%in TS1,93%,93%,89%in TS2 and 100%,100%,100%in TS3-4. The sensitivity of FDG-PET was significantly higher in comparison to CT and MRI in patients with TS1(P< 0.032) .The mean standardized uptake values(SUVs) did not show a significant difference in relation to the TS(TS1:5.8±4.5,TS2:5.7±2.2,TS3-4:8.2±3.9) ,respectively.All the TS1 tumors(from 13 to 20 mm) showed higher SUVs in FDG-PET with dual time point evaluation in the delayed phase compared with the early phase,which suggested the lesions were malignant. CONCLUSION:These results indicate that FDG-PET with dual time point evaluation is a useful modality for the detection of small pancreatic cancers with a diameter of less than 20 mm.

弥漫大B细胞淋巴瘤^(18)F-FDG PET/CT特点及预测骨髓浸润的价值

目的探讨弥漫大B细胞淋巴瘤(DLBCL)18氟-脱氧葡萄糖(^(18)F-FDG)正电子发射断层/计算机断层扫描(PET/CT)特点及预测骨髓浸润的价值。方法回顾性分析70例经病理确诊为DLBCL患者的^(18)F-FDG PET/CT影像资料,以PET/CT存在局灶性骨髓浸润灶认定为骨髓浸润,根据是否发生骨髓浸润分为骨髓浸润组和骨髓正常组。其中骨髓浸润组分为局部浸润、弥漫浸润、局部伴弥漫浸润三组。观察代谢参数最大标准化摄取值(SUVmax)、肿瘤代谢体积(MTV)、病灶糖酵解总量(TLG)值,使用Spearman分析影像参数与Ann Arbor分期的相关性。绘制受试者工作特征曲线(ROC)分析PET/CT对骨髓浸润的诊断价值。结果经^(18)F-FDG PET/CT检查发现,骨髓浸润16例(22.86%),骨髓正常54例(78.14%),骨髓浸润中,局部浸润2例(12.50%)、弥漫浸润4例(25.00%)、局部伴弥漫浸润10例(62.50%);对比骨髓浸润组与骨髓正常组的^(18)F-FDGPET/CT参数发现,骨髓浸润组SUVmax、MTV和TLG值均高于骨髓正常组(P<0.05);对比不同临床分期的^(18)F-FDG PET/CT参数发现,4个临床分期的SUVmax、MTV和TLG值差异显著,均随着临床分期的进程而升高(P<0.05);Spearman分析显示,SUVmax、MTV和TLG与临床分期均成正相关(r=0.944,r=0.569,r=0.982,P均<0,001);SUVmax、MTV和TLG诊断骨髓浸润的AUC的面积分别为0.999、0.700、0.994(P均<0.05)。结论^(18)F-FDG PET/CT诊断DLBCL患者效能较高,其影像参数均呈现较高水平,与临床分期具有相关性,且其对骨髓浸润诊断价值较高。

血清CXCL12、CCCK-18、MMP-9联合检测对急性出血性脑卒中患者近期预后不良的预测价值

目的 探讨血清CXC趋化因子配体12(CXCL12)、细胞角蛋白18裂解片段(CCCK-18)、基质金属蛋白酶-9(MMP-9)联合检测对急性出血性脑卒中患者近期预后不良的预测价值。方法 选取2021年10月至2023年3月该院收治的138例急性出血性脑卒中患者为研究对象。患者入院后治疗前检测血清CXCL12、CCCK-18、MMP-9水平。患者治疗后随访6个月,根据改良Rankin评分评估患者预后情况分为预后良好组与预后不良组。对比两组患者临床资料及血清CXCL12、CCCK-18、MMP-9水平,分析影响急性出血性脑卒中患者近期预后不良的因素,绘制受试者工作特征(ROC)曲线评价血清CXCL12、CCCK-18、MMP-9单项及联合检测对急性出血性脑卒中患者近期预后不良的预测价值。结果 138例患者中预后不良组52例,预后良好组86例,预后不良率为37.68%。预后不良组血清CXCL12、CCCK-18、MMP-9水平及年龄、入院时出血量、入院时美国国立卫生研究院卒中量表(NIHSS)评分、入院时收缩压、入院时舒张压均高于预后良好组,入院时格拉斯哥昏迷量表(GCS)评分低于预后良好组,差异有统计学意义(P<0.05)。多因素Logistic回归分析结果显示,血清CXCL12高水平、CCCK-18高水平、MMP-9高水平、高龄及入院时出血量大、NIHSS评分高、收缩压高均是急性出血性脑卒中近期预后不良的危险因素(P<0.05),入院时GCS评分高是保护因素(P<0.05)。ROC曲线分析显示,血清CXCL12、CCCK-18、MMP-9 3项联合预测曲线下面积高于各指标单独及两两联合预测(P<0.05)。结论 血清CXCL12、CCCK-18、MMP-9联合检测对急性出血性脑卒中患者近期预后不良具有较好的预测价值。

Clinical role of (18)~F-fluorodeoxyglucose positron emission tomography/computed tomography in post-operative follow up of gastric cancer: Initial results

AIM: To evaluate the clinical role of 18F-fluorodeo-xyglucose positron emission and computed tomography (18F-FDG PET/CT) in detection of gastric cancer recurrence after initial surgical resection. METHODS: In the period from January 2007 to May 2008, 23 patients who had previous surgical resection of histopathologically diagnosed gastric cancer underwent a total of 25 18F-FDG PET/CT scans as follow-up visits in our center. The standard of reference for tumor recurrence consisted of histopathologic confirmation or clinical follow-up information for at least 5 mo after PET/CT examinations. RESULTS: PET/CT was positive in 14 patients (61%) and negative in 9 (39%). When correlated with final diagnosis, which was confirmed by histopathologic evidence of tumor recurrence in 8 of the 23 patients (35%) and by clinical follow-up in 15 (65%), PET/CT was true positive in 12 patients, false positive in 2, true negative in 8 and false negative in 2. Overall, the accuracy of PET/CT was 82.6%, the negative predictive value (NPV) was 77.7%, and the positive predictive value (PPV) was 85.7%. The 2 false positive PET/CT findings were actually chronic inflammatory tissue lesions. For the two patients with false negativePET/CT, the f inal diagnosis was recurrence of mucinous adenocarcinoma in the anastomosis in one patient and abdominal wall metastasis in the other. Importantly, PET/CT revealed true-positive findings in 11 (47.8%) patients who had negative or no definite findings by CT. PET/CT revealed extra-abdominal metastases in 7 patients and additional esophageal carcinoma in one patient. Clinical treatment decisions were changed in 7 (30.4%) patients after introducing PET/CT into their conventional post-operative follow-up program. CONCLUSION: Whole body 18F-FDG PET/CT was highly effective in discriminating true recurrence in post-operative patients with gastric cancer and had important impacts on clinical decisions in a considerable portion of patients.

基于联邦学习与改进IS-ResNet18的人脸识别

在人脸识别场景中,边缘端的人脸数据采集与云端的数据处理之间存在着隐私泄漏风险,同时为了保证人脸识别准确高效,提出了一种基于联邦学习与改进IS-ResNet18的人脸识别方法.该方法通过联邦学习框架在不需要获取边缘端人脸数据的情况下进行模型训练,优化ResNet18模型,采用Leaky-ReLU激活函数代替ReLU激活函数以减轻神经元死亡,添加了Inception模块,优化注意力机制SE模块,增强模型对重要特征的关注程度,提高模型的表达能力和性能,缓解梯度消失和梯度爆炸的问题,增强模型的稳定性.经实验验证,该方法不仅保护了用户隐私,还保持了较高的识别准确率,具备良好的可行性和实用性.

^(18)F-Fluorodeoxyglucose positron emission tomography/computed tomography comparison of gastric lymphoma and gastric carcinoma

AIM To compare ^(18)F-fluorodeoxyglucose positron emission tomography/computed tomography(^(18)F-FDG PET/CT) features in gastric lymphoma and gastric carcinoma.METHODS Patients with newly diagnosed gastric lymphoma or gastric carcinoma who underwent ^(18)F-FDG PET/CT prior to treatment were included in this study. We reviewed and analyzed the PET/CT features of gastric wall lesions,including FDG avidity,pattern(focal/diffuse),and intensity [maximal standard uptake value:(SUVmax)]. The correlation of SUVmax with gastricclinicopathological variables was investigated by χ~2 test,and receiver-operating characteristic(ROC) curve analysis was performed to determine the differential diagnostic value of SUVmax-associated parameters in gastric lymphoma and gastric carcinoma. RESULTS Fifty-two patients with gastric lymphoma and 73 with gastric carcinoma were included in this study. Abnormal gastric FDG accumulation was found in 49 patients(94.23%) with gastric lymphoma and 65 patients(89.04%) with gastric carcinoma. Gastric lymphoma patients predominantly presented with type Ⅰ and type Ⅱ lesions,whereas gastric carcinoma patients mainly had type Ⅲ lesions. The SUVmax(13.39 ± 9.24 vs 8.35 ± 5.80,P < 0.001) and SUVmax/THKmax(maximal thickness)(7.96 ± 4.02 vs 4.88 ± 3.32,P < 0.001) were both higher in patients with gastric lymphoma compared with gastric carcinoma. ROC curve analysis suggested a better performance of SUVmax/THKmax in the evaluation of gastric lesions between gastric lymphoma and gastric carcinoma in comparison with that of SUVmax alone.CONCLUSION PET/CT features differ between gastric lymphoma and carcinoma,which can improve PET/CT evaluation of gastric wall lesions and help differentiate gastric lymphoma from gastric carcinoma.

Predictive value of ^(18)F-fluorodeoxyglucose PET/CT for transarterial chemolipiodolization of hepatocellular carcinoma

AIM： To investigate the correlation of 18F-fluorodeoxy- glucose （18F-FDG） positron emission tomography （PET） with clinical features and the prediction of treatment response. METHODS： A total of 83 hepatocellular carcinoma （HCC） patients undergoing 18F-FDG PET before transar- terial chemolipiodolization with systemic chemo-infusion between October, 2006 and May, 2009 were retrospec-tively enrolled. The patients included 68 men and 15 women （mean age, 60 ~ 10.7 years）. The effect of 18F- FDG-monitored PET uptake on clinical features and on the evaluated treatment response was ascertained with modified Response Evaluation Criteria in Solid Tumors. The PET parameters of maximal standardized uptake value of the tumor （Tsuvmax）, the ratio of the tumor maximal standardized uptake value （SUV） to the liver maximal SUV （Tsuvmax/Lsuwax） and the ratio of tumor maximal SUV to the liver mean SUV （msuvmax/LSUVrnean） were tested as predictive factors. RESULTS： Among the 3 SUV parameters, the TSUV- =maxdLsuvmean ratio （cutoff value of 1.90） was significantly associated with tumor burden including tumor size, tu- mor number, α-fetoprotein levels and tumor stage （P 〈 0.001, P = 0.008, P = 0.011, P 〈 0.001, respectively）. The objective response rates in patients with a high SUV ratio （≥ 1.90） were significantly better than those with a low SUV ratio （〈 1.90） （P = 0.020）. The overall survival rates of patients exhibiting a low Tsuvmax/Lsu- Vmean ratio （〈 1.90） and those with a high SUV ratio （≥1.90） was 38.2 and 10.3 mo, respectively （P 〈 0.01）. However, the time to progression showed no significant difference between the groups （P = 0.15）. CONCLUSION： 18F-FDG PET can be an important predictor of HCC treatment. In particular, the Tsuvmax/ Lsuwean ratio （cutoff value of 1.90） can provide useful information in treatment prognosis for HCC patients treated with Iocoregional therapy.

Prognostic value of pre-and post-transplantation 18F-fluorodeoxyglucose positron emission tomography results in non-Hodgkin lymphoma patients receiving autologous stem cell transplantation

Objective： High-dose chemotherapy （HDC） followed by autologous stem cell transplantation （ASCT） is the standard of care in the upfront or relapsed/refractory setting in some patients with non-Hodgkin lymphoma （NHL）. However, a proportion of patients do not respond to ASCT. lSF-fluorodeoxyglueose （FDG） positron emission tomography （PET）/computed tomography （CT） has been widely used for staging, response evaluation, and prognosis prediction. Here, we investigated the prognostic role of PET/CT in NHL patients before and after ASCT. Methods： A retrospective study was conducted at Peking University Cancer Hospital. All NHL patients who underwent ASCT between March 2010 and July 2016 were identified. Patients who had PET/CT scan before and after ASCT were included. Deauville criteria （5-point scale） were used to interpret PET scans. Univariate and multivariate survival analyses were performed using Cox regression. The predictive value of PET scanning was estimated by comparing the area under the receiver operating characteristic （ROC） curve. Results： In total, 79 patients were enrolled in this study. In univariate analysis, pre- and post-ASCT PET result was identified as prognostic factors for 3-year progression-free survival （PFS） and overall survival （OS）. Patients with negative pre-ASCT PET result demonstrated significantly better PFS （84.2% vs. 54.2%） and OS （89.2% vs. 63.6%） than patients with positive pre-ASCT PET result. PFS （91.6% vs. 25.3%） and OS （96.5% vs. 36.8%） were also significantly different between patients with negative and positive post-ASCT PET result. Multivariate analysis also showed a significant association between survival and post-ASCT PET result. ROC analysis revealed that the predictive value of post-ASCT PET result was superior to that of pre-ASCT PET result alone. Combined pre- and post-ASCT PET result is better for predicting outcomes in patients with NHL receiving transplantation. Deauville criteria score 〉3 was identified as the best cutoffvalue for post-ASCT PET. Conclusions： Post-ASCT PET result was more important than pre-ASCT PET result in predicting outcomes for NHL patients who underwent ASCT. The prognostic significance can be improved when combining pre- ASCT PET result with post-ASCT PET result. Deauville criteria can be used for interpreting PET scans in this scenario.

Positron emission tomography/computed tomography with ^(18)F-fluorodeoxyglucose identifies tumor growth or thrombosis in the portal vein with hepatocellular carcinoma

Patients suffering from hepatocellular carcinoma (HCC) with tumor thrombus in the portal vein generally have a poor prognosis. Portal vein tumor thrombus must be distinguished from portal vein blood thrombus, and this identification plays a very important role in management of HCC. Conventional imaging modalities have limitations in discrimination of portal vein tumor thrombus. The application of positron emission tomography (PET) with 18F-fluorodeoxyglucose (18F-FDG) for discrimination between tumor extension and blood thrombus has been reported in few cases of HCC, while portal tumor thrombosis and portal vein clot identified by 18F-FDG PET/CT in HCC patients has not been reported so far. We present two HCC cases, one with portal vein tumor thrombus and one thrombosis who were identified with 18F-FDG PET/CT. This report illustrates the complimentary value of combining the morphological and functional imaging in achieving a correct diagnosis in such clinical situations.

Clinical applications of 18 F-fluorodeoxyglucose positron emission tomography/computed tomography in carcinoma of unknown primary

Background Carcinoma of unknown primary （CUP） encompasses a heterogeneous group of tumors with varying clinical features. The management of patients of CUP remains a clinical challenge. The purpose of this study was to evaluate the clinical applications of integrated 18F-fluorodeoxyglucose positron emission tomography/computed tomography （FDG PET/CT） information in patients with CUP, including detecting the occult primary tumor and effecting on disease therapy.

18F-FCH PET/CT在原发与继发性甲状旁腺功能亢进中的对比研究

目的:对比18F-FCH PET/CT在原发性甲状旁腺功能亢进(PHPT)与继发性甲状旁腺功能亢进(SHPT)中的应用价值,并比较18F-FCH PET/CT影像参数在两者间的差异。方法:回顾性搜集行18F-FCH PET/CT显像的甲状旁腺亢进症患者50例(PHPT 28例,SHPT 22例)。通过t检验或非参数检验、Spearman相关性分析比较其临床生化指标、18F-FCH PET/CT显像参数及其诊断效能等方面的差异,比较18F-FCH PET/CT相关参数在PHPT与SHPT间的差异,同时探讨临床生化指标与PET参数间的相关性。结果:血钙、血磷、甲状旁腺激素、降钙素、MTV总和、TLFM总和在PHPT与SHPT两组间差异有统计学意义(P均<0.05),而SUV_(max)差异无统计学意义(P=0.072)。18F-FCH PET/CT检测PHPT更具优势,其诊断敏感度(分别为96.8%和74.6%)和阳性预测值(分别为96.8%和89.8%)均高于SHPT。血磷水平、SUV_(mean)总和鉴别诊断PHPT与SPHT的效能优于其他指标,其截断值分别为1.175(AUC=0.918)、3.4(AUC=0.8417)。PTH与SUV_(max)、MTV总和、TLFM总和等PET参数存在正相关性,其余临床指标与PET参数无明显相关性。结论:部分18F-FCH PET/CT影像参数及临床生化指标在PHPT与SHPT间差异有统计学意义,且PET/CT影像参数对PHPT的检测效能明显高于SHPT。在甲状旁腺功能亢进患者中,甲状旁腺激素与SUV_(max)、MTV总和、TLFM总和具有正相关性。

白细胞介素18在低氧暴露大鼠骨髓及外周血中表达的意义

背景:低氧暴露下大鼠外周血红细胞水平明显升高,而骨髓有核红细胞增殖可能是导致外周血红细胞增加的直接原因之一,既往研究着重于促红细胞生成素、低氧诱导因子等因素的影响,对炎症、免疫等相关因素的研究甚少。目的:研究低氧暴露后大鼠骨髓有核红细胞、骨髓上清液及外周血中白细胞介素18的表达,探讨白细胞介素18在慢性高原病发病过程中可能发挥的作用。方法:16只健康雄性SD大鼠随机分为2组:实验组在模拟海拔5000 m低压氧舱中饲养28 d,对照组在海拔2260 m的实验室内饲养28 d,检测两组大鼠血常规,流式测定两组大鼠骨髓CD71^(+)有核红细胞比例,RT-qPCR、Western blot测定两组大鼠骨髓CD71^(+)有核红细胞中白细胞介素18 mRNA和蛋白表达,免疫荧光测定两组大鼠胸骨中白细胞介素18蛋白表达,ELISA测定两组大鼠外周血、骨髓上清液中白细胞介素18水平。结果与结论:①实验组大鼠外周血红细胞计数、血红蛋白、红细胞压积、平均血红蛋白含量等指标均较对照组增高(P<0.05);②实验组大鼠骨髓CD71^(+)有核红细胞比例较对照组显著增高(P<0.05);③RT-qPCR结果显示,实验组大鼠骨髓CD71^(+)有核红细胞中白细胞介素18 mRNA表达较对照组显著增高(P<0.05);④Western blot结果显示,实验组大鼠骨髓CD71^(+)有核红细胞中白细胞介素18蛋白表达较对照组显著增高(P<0.05);⑤免疫荧光结果显示,实验组大鼠胸骨中白细胞介素18蛋白表达较对照组显著增高(P<0.05);⑥ELISA结果显示,实验组大鼠血清中白细胞介素18水平较对照组增高(P<0.05),但实验组大鼠骨髓上清液中白细胞介素18水平较对照组下降(P<0.05)。结果表明低氧暴露后大鼠骨髓CD71^(+)有核红细胞、外周血中白细胞介素18表达增高可能参与骨髓有核红细胞的增殖过程。

Diagnostic role of 18F-fluorodeoxyglucose positron emission tomography for follicular lymphoma with gastrointestinal involvement

AIM:To investigate the capacity for 18F-fluorodeoxyglucose(18F-FDG) positron emission tomography(PET) to evaluate patients with gastrointestinal lesions of follicular lymphoma.METHODS:This retrospective case series consisted of 41 patients with follicular lymphoma and gastrointestinal involvement who underwent 18F-FDG-PET and endoscopic evaluations at ten different institutions between November 1996 and October 2011.Data for endoscopic,radiological,and biological examinations performed were retrospectively reviewed from clinical records.A semi-quantitative analysis of 18F-FDG uptake was performed for each involved area by calculating the maximum standardized uptake value(SUVmax).Based on the positivity of 18F-FDG uptake in the gastrointestinal lesions analyzed,patients were subdivided into two groups.To identify potential predictive factors for 18F-FDG positivity,these two groups were compared with respect to gender,age at diagnosis of lymphoma,histopathological grade,pattern of follicular dendritic cells,mitotic rate,clinical stage,soluble interleukin-2 receptor levels detected by 18F-FDG-PET,lactate dehydrogenase(LDH) levels,hemoglobin levels,bone marrow involvement,detectability of gastrointestinal lesions by computed tomography(CT) scanning,and follicular lymphoma international prognostic index(FLIPI) risk.RESULTS:Involvement of follicular lymphoma in the stomach,duodenum,jejunum,ileum,cecum,colon,and rectum was identified in 1,34,6,3,2,3,and 6 patients,respectively.No patient had esophageal involvement.In total,19/41(46.3%) patients exhibited true-positive 18F-FDG uptake in the lesions present in their gastrointestinal tract.In contrast,false-negative 18F-FDG uptake was detected in 24 patients(58.5%),while false-positive 18F-FDG uptake was detected in 5 patients(12.2%).In the former case,2/19 patients had both 18F-FDG-positive lesions and 18F-FDGnegative lesions in the gastrointestinal tract.In patients with 18F-FDG avidity,the SUVmax value of the involved gastrointestinal tract ranged from 2.6 to 17.4(median:4.7).For the 18F-FDG-negative(n = 22) and-positive(n = 19) groups,there were no differences in the male to female ratios(10/12 vs 4/15,P = 0.186),patient age(63.6 ± 2.4 years vs 60.1 ± 2.6 years,P = 0.323),presence of histopathological grade 1 vs 2(20/2 and 17/2,P = 1.000),follicular dendritic cell pattern(duodenal/nodal:13/5 vs 10/3,P = 1.000),mitotic rate(low/partly high,14/1 vs 10/3,P = 0.311),clinical stage according to the Ann Arbor system(stages ⅠE and ⅡE/other,15/7 vs 15/4,P = 0.499),clinical stage according to the Lugano system(stages Ⅰ and Ⅱ-1/other,14/8 vs 14/5,P = 0.489),soluble interleukin-2 receptor levels(495 ± 78 vs 402 ± 83,P = 0.884),LDH levels(188 ± 7 vs 183 ± 8,P = 0.749),hemoglobin levels(13.5 ± 0.3 vs 12.8 ± 0.4,P = 0.197),bone marrow involvement(positive/negative,1/8 vs 1/10,P = 1.000),detectability by CT scanning(positive/negative,1/16 vs 4/13,P = 0.335),and FLIPI risk(low risk/other,16/6 vs 13/6,P = 0.763),respectively in each case.CONCLUSION:These findings indicate that it is not feasible to predict 18F-FDG-avidity.Therefore,18FFDG-PET scans represent a complementary modality for the detection of gastrointestinal involvements in follicular lymphoma patients,and surveillance of the entire gastrointestinal tract by endoscopic examinations is required.

^(18)F-PSMA-1007不同的重建算法对前列腺癌图像质量影响的初步探索

目的:本研究旨在评估不同重建算法对^(18)F-PSMA-1007 PET/CT在前列腺癌诊断中的半定量准确性和图像质量的影响,探讨其在提高诊断效能方面的潜力。方法:回顾性分析2022年4月至2024年4月期间,97例疑似前列腺癌患者的^(18)F-PSMA-1007 PET/CT数据。数据采用Iterative+VUE Point、3D-Reprojection、3D-FORE-FBP及3D-FOREIterative四种算法进行重建。以穿刺或手术病理结果为“金标准”,比较不同算法下的诊断效能(灵敏度、特异度、准确度)及半定量参数(SUVmax、SUVmean、SUVpeak)。结果:3D-FORE-Iterative算法在阳性率、准确度、灵敏度、特异度、阳性及阴性预测值方面均优于其他算法(P<0.05)。SUVmean、SUVmax、SUVpeak及Std在3D-FORE-Iterative算法下均低于其他算法(P<0.05)。图像质量评分显示,3D-FORE-Iterative算法在图像质量、清晰度和病变显著性方面得分最高(P<0.05)。结论:3D-FORE-Iterative算法在前列腺癌^(18)F-PSMA-1007 PET/CT诊断中显示出最高的诊断效能和图像质量,为临床提供了更精确的诊断工具。未来的研究应关注该算法在不同患者群体中的普适性和长期临床效果。

Dynamic ^(18)F-fluorodeoxyglucose positron emission tomography/CT in hibernoma: enhanced tracer uptake mimicking liposarcoma

We report on two cases of patients with fat-equivalent masses in computed tomography(CT),referred to our department for dynamic positron emission tomography/CT(dPET/CT)with18F-fluorodeoxyglucose(18FFDG)in order to investigate their dignity.Both qualitative and quantitative information,as derived from dPET/CTs,couldn’t exclude a high-grade liposarcoma:Visual evaluation,revealed a large hypermetabolic focus of intense18F-FDG uptake in each patient(average SUVs 8.3 and 11.3).Regression-based parametric imaging demonstrated an enhanced distribution volume,which correlates to perfusion,and a high phosphorylation rate that correlates to cell viability.Kinetic analysis,based on a two-tissue compartment model demonstrated an enhanced FDG transport k1and an enhanced phosphorylation rate k3.A non-compartmental approach based on fractal dimension revealed also enhanced values.However,final diagnosis was based on biopsy,which revealed hibernoma,a benign brown fat tumor.Brown adipose contains increased numbers of mitochondria and a high-rate of glucose metabolism.Therefore,they have increased FDG uptake.The evaluation of lipomatous lesions on CT,with high FDG uptake,should include the possibility of hibernoma as a differential diagnosis.

Emerging role of ^(18)F-fluorodeoxyglucose positron emission tomography for guiding management of hepatocellular carcinoma

Hepatocellular carcinoma(HCC) is one of major causes of cancer mortality worldwide. For decades, ^(18)F-fluorodeoxyglucose(FDG) positron emission tomography(PET) has been widely used for staging, predicting prognosis, and detecting cancer recurrence in various types of malignant diseases. Due to low sensitivity of FDG PET for detecting intrahepatic HCC lesions, the clinical value of FDG PET in HCC patients has been limited. However, recent studies with diverse analytic methods have shown that FDG PET has promising role in aiding management of HCC patients. In this review, we will discuss the clinical role of FDG PET for staging, predicting prognosis, and evaluating treatment response in HCC. Further, we will focus on recent clinical studies regarding implication of volumetric FDG PET parameters, the significance of FDG uptake in HCC for selecting treatment and predicting treatment response, and the use of radiomics of FDG PET in HCC.

第18届世界地震工程大会岩土地震工程领域进展综述

通过参会交流和对口头报告论文的研读,对第18届世界地震工程大会岩土地震工程与场地响应领域的研究与实践进展进行了综述。内容包括大会大师报告、特邀报告相关进展和分会口头报告相关进展两个方面,涉及专题:强震动记录排序,地震危险性评估,区域尺度的地震滑坡评价及应用;隧道与地下基础设施的抗震设计、风险评估与管理;液化场地的地下结构;岩土隔震;面向结构保护和基于抗震超材料的创新地基相互作用概念;浅基础抗震设计中的挑战;面向建筑物和桥梁的土-结构相互作用模型与韧性应用;地震输入、场地效应和土-结构相互作用的历史发展与对其易损性曲线的影响;抗液化结构;场地响应谱分析的实践、知识和技术的现状与讨论;采用土工合成材料的岩土地震工程;土体非线性对建筑环境的影响-观测与预测等。以期与读者全方位分享本届盛会该领域的主要进展。

以高钙血症为首发症状的结节病18F-FDG PET/CT显像1例

1病例简介女,50岁,主诉:血钙升高半年。查体:双颊皮肤红,双肾区叩痛,双下肢中度水肿,可见四肢及后背多发紫褐色斑片。实验室检查:血钙3.08 mmol/L,甲状旁腺激素2.560 ng/L,肌酐235.8μmol/L,总25-(OH)维生素D 8.670μg/L,神经元特异性烯醇化酶19.920μg/L。24 h尿钙19.16 mmol/24 h。

从18WCEE看基于ML的结构地震响应预测和损伤评估研究进展

随着计算机技术的进步,机器学习在多个领域的应用日益广泛。在地震工程领域,如何有效利用机器学习以解决实际问题,已成为地震工程专家关注的焦点。本文立足于18届世界地震工程大会中的会议论文,以近年来国内外相关研究文献作为补充,对基于机器学习的结构地震响应预测和损伤评估的相关研究进行了总结和评述。首先,从算法的角度分别梳理了机器学习和深度学习在结构地震响应预测方面的研究现状,介绍了现有研究中的常用算法及其适用性;其次,按照数据类型将数据分为时序数据和图像数据,针对每一类数据,分别总结评述了其基于机器学习的结构地震损伤评估的研究现状,包括数据来源、研究流程以及优缺点;最后,针对目前存在的数据质量不高或分布不均衡、参数选择困难和模型泛化性能较差等问题,讨论了未来的研究方向,旨在推动机器学习在地震工程领域的深入应用和进一步发展。