FDG PET／CT代谢体积对食管癌术后预后的预测价值

目的研究食管癌患者^18F-FDG PET／CTMTV与预后的关系。方法回顾性分析2004年3月至2008年3月行^18F—FDG PET／CT检查的49例Ⅰ—Ⅳa期的食管癌患者,均经病理检查证实,随访资料完整。患者均行食管癌切除术,随访截止至2009年11月,中位随访时间为29（8～57）个月。应用Kaplan—Meier法及Cox比例风险模型分析年龄、性别、肿瘤位置、肿瘤组织分化程度、PET／CT示肿瘤长径、美国肿瘤联合会（AJCC）分期、转移淋巴结个数、原发灶SUVmax及MTV与预后的关系。结果在单因素分析中,仅AJCC分期[χ^2=16．206,危险比（HR）=1．177,P〈0．001）,淋巴结分期（N）（χ^2=9．536,HR=10．833,P=0．002）,浸润深度（T）（χ^2=5．810,FIR=2．397,P=0．016）,淋巴结转移个数（χ^2=11．423,HR=1．567,P=0．001）、MTV（χ^2=3．872,HR=2．433,P=0．049）对预后存在预测作用。对以上变量行多因素分析,仅AJCC分期及MTV是独立的预后因子（r=4．525,HR=1．170,P=0．033;χ^2=4．875,HR=3．071,P=0．027）。Kaplan-Meier生存分析显示术前低MTV组比高MTV组的生存率高（Log—rank检验,χ^2=4．186,P=0．041）。结论MTV与食管癌术后患者的预后密切相关。对于高MTV患者,术后可能需要接受更加积极的治疗。     

18F-FDG PET或PET/CT评估乳腺癌新辅助化疗疗效价值的meta分析

目的 用meta分析方法评价18F-FDG PET或PET/CT用于乳腺癌新辅助化疗疗效评估的准确性和预测价值.方法 检索PubMed、Embase、Cochrane以及万方数据库中相关的英文或中文文献.制定纳入文献的选择标准,并按照诊断性研究质量评价(QUADAS)评分表对文献质量进行评分,以保证纳入研究的同质性.对符合标准的研究结果进行meta分析,估计和比较PET和其他影像检查(以测量肿瘤体积改变情况为评估指标)的加权Se、Sp、LR、诊断优势比(DOR)与综合ROC(SROC)曲线,判断PET和其他影像检查评估新辅助化疗的准确性.用绘制漏斗图和meta回归的方法探讨纳入研究的异质性来源.结果 16篇文献符合全部纳入标准,含662例研究对象.Meta分析加权值:(1)PET:SePET 86.1％(247/287),SpPET 69.6％(261/375),LR + PET 3.18,LR - PET0.23,DORPET 17.26;(2)其他影像检查:Sed 57.2％ (91/159),Spd 48.5％(50/103),LR+d1.07,LR-d0.87,DORd1.30.绘制SROC曲线,得出QPET*(0.8058)＞Qd*(0.5328).漏斗图示发表偏倚对结果影响小.Meta回归分析发现,文献发表年份可能是异质性的来源之一(P=0.05).结论 监测葡萄糖代谢的改变比测量肿瘤大小的改变更能准确评估乳腺癌新辅助化疗的疗效.     

PET／CT对多发性骨髓瘤的诊断价值

目的探讨多发性骨髓瘤的PET／CT影像学特点,评价其在多发性骨髓瘤诊断中的价值。方法15例按2001年WHO诊断标准确诊为多发性骨髓瘤患者,均在治疗前行PET／CT显像。15例患者经骨髓穿刺和（或）手术病理检查测浆细胞,实验室检查显示有9例患者血清IgG明显升高（〉35g／L）,有8例24h尿本周蛋白增高（〉1g）,15例患者均有溶骨性病变。结果CT所示骨质破坏区域及PET示代谢变化骨髓瘤病灶137个。多发性骨髓瘤病变部位以颅骨37．2％（51／137）、肋骨26．3％（36／137）、椎体12．4％（17／137）为多发,其次为髂骨7．3％（10／137）、骶骨5．8％（8／137）、四肢骨4．4％（6／137）、锁骨3．6％（5／137）、肩胛骨2．9％（4／137）。在137个病灶中,有71个病灶PET显示放射性摄取增高,阳性率为51．8％;有66个病灶表现为放射性摄取稀疏及缺损。而CT主要表现为多发性穿凿样或虫蚀样骨质破坏。结论PET／CT显像对多发性骨髓瘤的临床诊断有较高的价值。     

^18F-FDG PET／CT显像监测胃癌术后复发转移的价值

目的评价^18F-脱氧葡萄糖（FDG）PET／CT监测胃癌术后复发及转移的临床价值。方法回顾性分析胃癌术后临床疑复发或转移而行^18F-FDG PET／CT检查的45例患者临床资料,根据细胞学、病理或随访结果分析PET／CT检查结果,计算残胃及转移灶最大标准摄取值（SUVmax）。采用SPSS11．5软件进行数据处理,SUVmax两样本均数比较采用t检验。结果（1）45例中22例临床疑残胃复发,12例患者最终确定残胃复发,^18F-FDG PET／CT诊断残胃复发的灵敏度、特异性及准确性分别为100．0％（12／12）、70．0％（7／10）和86．4％（19／22）,12例复发病灶SUVmax为6．27±3．42（其中2例低分化腺癌的SUVmax较低,分别为2．5和3．3）,另10例无复发的残胃SUVmax为3．92±2．24（其中3例吻合口炎性病灶局部SUVmax较高,分别为8．3,5．2和6．3）,差异无统计学意义（t=1．862,P〉0．05）。（2）对残胃以外转移灶的检出：PET／CT灵敏度、特异性、准确性在区域淋巴结转移中分别为78．9％（15／19）、92．3％（24／26）和86．7％（39／45）,在腹膜转移中分别为6／9、97．2％（35／36）和91．1％（41／45）,在远处转移中分别为86．7％（13／15）、93．3％（28／30）和91．1％（41／45）。（3）PET／CT假阳性8处为炎性或肠管摄取,假阴性9处多为直径〈1．0cm的转移灶和低分化腺癌及印戒细胞癌的转移灶。结论^18F-FDG PET／CT虽然检测胃癌术后区域淋巴结和腹膜转移的灵敏度较低,但仍是监测其术后复发转移的有效手段。     

^18F-FDG PET／CT双时相显像对肺部病灶的定性诊断价值

目的探讨^18F-脱氧葡萄糖（FDG）PET／CT双时相显像在肺部病灶良恶性鉴别诊断中的临床应用价值。方法78例临床疑诊肺癌患者,均行早期和延迟^18F—FDG PET／CT显像。计算早期及延迟显像最大标准摄取值（SUVmax）,并计算2次显像SUVmax变化率（ASUV）。以SUVmax〉2．5和ASUV〉20％作为诊断肺癌的标准。患者最终诊断均经组织病理学、细菌学或治疗后随访证实。采用SPSS13．0软件,SUV组间比较用t检验,用受试者工作特征（ROC）曲线评价SUVmax、ASUV对肺部病灶的定性诊断价值。结果（1）78例患者中肺癌60例,良性病变18例（增殖性病变16例,占88．89％）。肺癌组（9．92±5．33和7．94±4．17,t=10．19）和良性病变组（8．54±6．61和7．21±5．74,t=8．23,P均〈0．01）延迟SUVmax均明显高于早期SUVmax;肺癌组与良性病变组间早期和延迟显像SUVmax差异均无统计学意义（t=0．60和-0．91,P均〉0．05）;肺癌组与良性病变组ASUV差异也无统计学意义[（26．04±14．73）％和（18．09±24．09）％,t=1．67,P〉0．05]。18例良性病变患者中有2例延迟显像SUVmax较早期减低,而肺癌患者延迟显像SUVmax均无减低。（2）以SUVmax〉2．5和ASUV〉20％为诊断肺癌的标准,其灵敏度、特异性、准确性、阳性预测值和阴性预测值分别为93．33％（56／60）和63．33％（38／60）、22．22％（4／18）和50．00％（9／18）、76．92％（60／78）和60．26％（47／78）、80．00％（56／70）和80．85％（38／47）、50．00％（4／8）和70．97％（22／31）;根据SUVmax和ASUV得到的ROC曲线下面积分别为0．61（Z=1．38,P〉0．05）和0．56（Z=0．65,P〉0．05）,差异均无统计学意义。结论对肺部病灶临床疑诊为肺癌的患者,如良性病变以增殖性病变为主,则^18F—FDG PET双时相显像良恶性鉴别诊断临床应用价值不大;但延迟SUVmax减低可能?     

18F-FDG PET/CT和增强CT对胰腺病变定性诊断的价值比较

目的评价^18F-脱氧葡萄糖（FDG）PET／CT对胰腺良、恶性病变定性诊断的价值。方法对15例胰腺恶性病变，6例良性病变患者行全身^18F-FDGPET／CT和增强CT检查，根据PET、增强CT和PET／CT图像上的表现分别诊断，并将结果进行比较。结果PET和PET／CT准确诊断全部恶性病变，而增强CT准确诊断全部良性病变。PET和PET／CT在6例良性病变诊断中分别显示2例和1例假阳性，而增强CT在15例恶性病变中有2例假阴性，但在上述3种诊断方法中分别出现的假阳性或假阴性都得到了相互间的纠正。增强CT、PET和PET／CT三者在诊断胰腺恶性肿瘤上的准确性分别为90．5％，90．5％和95．2％。此外，PET／CT比增强CT检出了更多的肝脏、淋巴结和骨转移灶；两者检出病灶数量分别为35，41，9和16，24，3个。结论PET／CT在胰腺良、恶性病变定性诊断上有价值，PET／CT和增强CT联合应用有利于进一步提高对胰腺恶性肿瘤的诊断和分期准确性。     

18F-FDG PET/CT对肾脏肿瘤的诊断价值

目的 探讨18F-FDG PET/CT对肾脏肿瘤的临床诊断价值.方法 回顾性分析近5年经18 F-FDG PET/CT诊断为肾脏肿瘤且病理或临床综合诊断明确的79例患者资料,其中男52例,女27例,平均年龄(57.3±14.1)岁.PET/CT诊断根据肾脏轮廓改变、病灶密度异常及FDG摄取程度做出.计算18F-FDG PET/CT诊断肾脏肿瘤的效能指标.结果 79例中恶性肿瘤70例(包括肾细胞癌40例、肾盂癌5例,淋巴瘤8例,转移瘤16例,肾筋膜囊脂肪肉瘤1例);良性肿瘤9例(包括血管平滑肌脂肪瘤7例,肾嗜酸细胞腺瘤1例,后肾腺瘤1例;不含小脂滴样错构瘤病例).18 F-FDG PET/CT对病灶检出率达97.5％(77/79),对肾脏良恶性病灶判断的灵敏度为92.9％ (65/70),特异性为7/9,准确性为91.1％ (72/79),阳性预测值为97.0％(65/67),阴性预测值为58.3％ (7/12).结论 18 F-FDG PET/CT能够检出并判断大部分肾脏占位病变性质,对肾脏肿瘤患者进行全身检查并做出综合评价是18F-FDG PET/CT的优势之一.     

细支气管肺泡癌^18F—FDG PET／CT显像的代谢和形态特征

目的分析细支气管肺泡癌（BAC）在^18F-脱氧葡萄糖（FDG）PET／CT图像中的代谢和形态结构特征,并与非细支气管肺泡型腺癌（non—BAC AC）的显像结果进行比较,探讨PET／CT在BAC诊断及鉴别诊断中的价值。方法回顾性分析经病理检查确诊的32例BAC及55例non—BAC AC的FDG PET／CT显像资料。测量病灶最大标准摄取值（SUVmax）,分析病灶位置、形态及边界、密度分布及其他典型CT结构征象。统计分析比较2组的平均SUVmax,评价与肿瘤分型有关的CT征象,比较单独PET、CT及PET和CT联合诊断的准确性。采用SPSS12．0软件对数据行t检验、McNemar检验、Fisher精确检验等。结果BAC组共47个病灶,non—BACAC组共63个病灶,组间SUVmax差异有统计学意义（1．51±0．17与6．28±3．04,t=-10．374,P〈0．0001）。BAC组纯磨玻璃密度影（45％的病灶,21／47）是相关的CT征象（Fisher精确检验,P〈0．0001）。结合PET代谢和CT解剖结构特征的联合诊断准确性与单独PET或CT对比,差异均有统计学意义（P=0．001和0．039）,诊断准确性分别为88％（28／32）、47％（15／32）和66％（21／32）。结论理解FDG PET／CT显像中BAC的代谢和形态结构特征,有利于提高诊断准确性。如动态观察中呈持续的CT磨玻璃密度影,即使低FDG摄取,也要考虑BAC可能。     

18F-FDG PET/CT显像对小肠腺癌的诊断价值

目的 探讨18F-FDG PET/CT全身显像对小肠腺癌(SIA)的诊断价值.方法 回顾29例SIA(男17例,女12例)、21例小肠淋巴瘤(SIL;男15例,女6例)及10例小肠结核(SIT;男4例,女6例)的18F-FDG PET/CT显像资料,采用目测法和半定量方法(SUVmax)分析3种疾病PET/CT显像特点.计量资料差异比较用单因素方差分析,率的比较行x2检验.结果 (1) PET/CT图像上SIA多表现为小肠局部团块状、结节状高代谢灶,典型的SIL为小肠局部环形异常放射性浓聚灶,SIT多呈结节状、条状高代谢灶、病灶呈“跳跃性”分布;SIA的SUVmax为8.44±3.82,低于SIL(11.54±4.02; F=86.96,t=2.77,均P＜0.01),与SIT的8.61±2.99差异无统计学意义(t=0.11,P＞0.05).(2)SIA、SIL和SIT的灶周淋巴结肿大检出率分别为72.41％ (21/29)、85.71％(18/21)和70.00％ (7/10) (x2=1.50,P＞0.05);SIA的灶周肿大淋巴结SUVmax为5.59±2.86,明显低于SIL的11.10±5.72(F=56.56,t=3.85,均P＜0.01),与SIT的5.63±3.36差异无统计学意义(t=0.30,P＞0.05).PET/CT显像对SIA的灶周淋巴结肿大检出率明显高于CT(41.38％,12/29;x2=5.69,P＜0.05).(3)55.17％(16/29)的SIA有小肠外转移灶;66.67％(14/21)的SIL有小肠外病灶,以全身多发淋巴结浸润多见;80.00％(8/10)的SIT有腹腔外结核灶;三者小肠外病灶检出率差异无统计学意义(x2=2.13,P＞0.05).(4)29例SIA中15例(51.72％)累及回肠,8例(27.59％)累及空肠,4例(13.79％)空肠回肠同时受累,2例(6.90％)空肠十二指肠同时受累,病灶分布差异有统计学意义(x2=18.16,P＜0.01).(5)29例SIA中单原发癌8例(27.59％),转移性癌14例(48.28％),7例(24.14％)考虑为双原发癌.(6)以病理、诊断性治疗和临床随访结果为标准,18F-FDG PET/CT显像诊断SIA的灵敏度为93.10％(27/29),特异性为80.00％(8/10).结论 18F-FDG PET/CT全身显像可用于SIA的鉴别诊断,可为单原发、多原发及转移性SIA诊断提供依据.     

^18F-FDG PET／CT显像对肺癌临床治疗决策的影响

目的评价^18F-脱氧葡萄糖（FDG）PET／CT显像对肺癌分期、再分期及临床治疗决策的影响。方法收集2007年7—12月接受PET／CT检查的肺癌或肺癌经过手术、放疗或化疗至少1种治疗的患者为研究对象。通过临床医师填写问卷调查的方法了解患者临床治疗相关资料。PET／CT检查前及检查后问卷资料均齐全的病例为资料完整者。治疗方法主要分为手术、放疗、化疗、随访4种,改变主要分为不同治疗方式间和同一治疗方式内部2种。结果参考PET／CT检查前后问卷情况,资料完整符合要求的病例245例纳入研究进行分析,其中49．8％（122／245）为初次分期,50．2％（123／245）为治疗后再分期或治疗效果评价。PET／CT检查前后临床分期改变为26．5％（65／245）,其中分期上调为17．1％（42／245）,分期下调为9．4％（23／245）,另外还有5．7％（14／245）的病例由于相应临床医师习惯参考PET／CT结果进行分期,故PET／CT检查影响临床分期32．2％（79／245）。PET／CT检查前后治疗方案改变为51．8％（127／245）,不同治疗方式间改变为15．9％（39／245）,同一治疗方式内部改变为35．9％（88／245）。结论^18F-FDG PET／CT显像可提高肺癌临床分期或再分期的准确性,进而影响肺癌临床治疗决策。     

PET／CT对肺部肿块的诊断

目的探讨^18F-脱氧葡萄糖（FDG）PET／CT显像对肺部肿块的诊断和鉴别诊断价值,研究肿块大小和PET／CT显像最大标准摄取值（SUVmax）的相关性。方法对经病理检查和综合手段（临床、影像学或血液学等检查）证实的85例肺部肿块（59例恶性肿瘤、26例肺部良性肿块）患者进行回顾性分析。分别观察肺部肿块的CT形态（是否有脐凹、分叶、短细毛刺、粗盐样钙化、表面粗糙等）及PET显像肺部肿块感兴趣区（ROI）的FDG SUVmax。结合临床和病理诊断结果,分别比较分析PET、CT、PET／CT对肺部肿块诊断的灵敏度、特异性、准确性。对肿块大小和SUVmax进行Pearson相关分析。结果PET对85例肺部肿块患者诊断的灵敏度、特异性和准确性分别为89．8％（53／59）、61．5％（16／26）、81．2％（69／85）;CT分别为88．1％（52／59）、65．4％（17／26）、81．2％（69／85）;PET／CT分别为96．6％（57／59）、80．8％（21／26）、91．8％（78／85）。59例恶性肿瘤的肿块大小和SUVmax明显相关（r=0．617,P〈0．001）,而26例肺部良性肿块大小和SUVmax不相关（r=0．211,P〉0．05）。结论”F-FDG PET／CT对肺部肿块较单纯PET、单纯CT的诊断灵敏度、特异性、准确性高;恶性肿瘤的肿块大小和SUVmax正相关,而良性病变的大小和SUVmax不相关。     

320排螺旋CT对进展期胃癌侵犯胃周脏器的诊断价值

目的 :探讨320排螺旋CT对进展期胃癌侵犯胃周脏器的应用价值。方法:回顾性分析134例侵及肝脏、胰腺及结肠和(或)网膜等脏器的进展期胃癌的CT资料,并结合临床病理资料,总结胃癌侵犯胃周围脏器的CT征象。结果:134例中CT正确诊断107例(79.9%),漏诊17例,误诊10例;肝脏受侵诊断准确率83.3%;胰腺受侵诊断准确率91.1%;网膜和(或)结肠受侵诊断准确率为69.2%;网膜及胰腺同时受侵诊断准确率91.6%。CT征象:肝脏受侵可见肝胃脂肪层消失,有或无邻近肝脏异常强化;胰腺受侵胃壁与胰腺间脂肪层密度增高、条索、网格或脂肪层消失,胰腺实质见不规则轻度强化或无强化区;网膜和(或)结肠受侵见肿瘤部胃壁及受侵肠壁浆膜面毛糙,网膜增厚,见长短不一索条,明显强化。结论:320排螺旋CT扫描能有效评估进展期胃癌是否侵犯胃周组织,具有较高临床应用价值。     

FDG PET/CT摄取-体积指数对鼻咽癌预后的预测价值

目的 研究鼻咽癌患者18F-脱氧葡萄糖（FDG）PET/CT代谢体积（MTV）及摄取-体积指数（UVI）与预后的关系.方法 回顾性分析该院2002年10月至2004年7月放疗前后分别行18F-FDG PET/CT检查的37例均经病理检查证实为Ⅰ～Ⅳa期的鼻咽癌患者.患者均行6 MV X射线适形调强放射治疗.治疗后随访5年,并用Kaplan-Meier法、Log-rank检验及Cox比例风险模型分析MTV及UVI与预后的关系.结果 全组患者5年总生存率（OS）为70.3%（26/37）,5年无瘤生存率（DFS）为62.2%（23/37）.MTV＜30 cm3的患者5年OS为82.6%（19/23）和DFS为73.9%（17/23）,均高于MTV≥30 cm3的患者的50.0%（7/14）和42.9%（6/14）,差异有统计学意义（x2=5.28和4.84,P均＜0.05）.UVI＜150的患者5年OS为87.5%（21/24）,5年DFS为79.2%（19/24）,均高于UVI≥150的患者[38.5%（5/13）和30.8%（4/13）],差异均有统计学意义（x2=10.72和11.04,P＜0.01）.多因素分析显示,UVI和代谢缓解对鼻咽癌患者的预后有统计学意义.结论 18F-FDGPET/CT UVI和代谢缓解与鼻咽癌患者的预后密切相关.UVI高的患者以及放疗后未达到代谢完全缓解的患者预后较差,可能需要接受更加积极的治疗.     

^18F-FDG PET／CT诊断恶性肿瘤骨转移的应用价值

目的评价^18F-脱氧葡萄糖（FDG）PET／CT检测恶性肿瘤骨转移的应用价值。方法回顾性分析经^18F-FDG PET／CT诊断的689例恶性肿瘤患者的资料,按颈椎、胸椎、腰椎、骶尾椎、骨盆、肩胛骨和锁骨、长骨、胸骨、肋骨及颅骨将机体骨骼分为10个区域,记录每个区域的骨转移情况。根据同机CT进一步区分转移灶的病变性质（破骨性或成骨性）,比较同机CT、^18F-FDG PET及^18F-FDG PET／CT诊断骨转移的灵敏度、特异性及准确性。计算阳性病灶的最大标准摄取值（SUVmax）。患者不同性别间年龄差异采用χ^2检验,诊断率的比较采用MeNemar检验。结果共有91例患者442个区域被确定有骨转移,PET／CT诊断骨转移患者的灵敏度、特异性和准确性分别为94．5％（86／91）、97．8％（585／598）和97．4％（671／689）,高于同机CT的79．1％（72／91）,91．8％（549／598）和90．1％（621／689）（χ^2=20．049,148．890,168．792,P：0．000）;PET／CT诊断病灶骨转移的灵敏度、特异性和准确性分别为95．0％（420／442）,97．2％（455／468）和96．2％（875／919）,高于同机CT的81．0％（358／442）,90．4％（423／468）和85．8％（781／910）（χ^2=98．673,125．691,220．375,P=0．000）。同机CT共诊断出99个成骨性和197个破骨性病变。PET真阳性病灶SUVmax为6．7±3．0,假阳性病灶SUVmax为3．7±1．3（χ^2=463．120,P=0．000）;成骨性病变SUVmax为4．9±2．0,破骨性病变SUVmax为7．4±3．1（χ^2=327．175,P：0．000）。结论同机CT和^18F-FDG PET图像的结合提高了PET／CT诊断恶性肿瘤骨转移的能力;同机CT能精确定位病变,并可区分转移病灶的成骨或破骨性质。     

^18F-FDG PET／CT显像诊断妇科肿瘤复发、转移的价值

目的探讨^18F-脱氧葡萄糖（FDG）PET／CT显像诊断妇科肿瘤复发、转移的价值,并评价其对临床再分期及治疗决策的影响。方法对47例临床可疑复发、转移的妇科肿瘤患者行^18F—FDG PET／CT显像,对PET、CT及PET／CT图像进行对比分析。采用SPSS12．0软件,对数据行∥检验、校正的,检验及确切概率法分析。结果47例患者中共发现病灶158处,其中恶性病灶149处,良性病灶9处。^18F-FDG PET／CT诊断妇科肿瘤复发、转移的灵敏度、特异性、准确性、阳性预测值及阴性预测值分别为95．97％（143／149）,6／9,94．30％（149／158）,97．95％（143／146）及50．00％（6／12）。PET／CT在诊断妇科肿瘤复发、转移的灵敏度、准确性及阴性预测值方面明显优于单纯CT（χ^2=18．198,18．890,6．825,P均〈0．05）;^18F-FDG PET／CT和单纯PET在各项诊断效能指标间差异无统计学意义（χ^2=0．632,0．000,0．459,0．000,0．150,P均〉0．05）,但PET／CT使33．54％（53／158）的单纯PET无法准确定位的病灶得到了准确定位。同单纯CT及PET相比,PET／CT分别使44．68％（21／47）和31．91％（15／47）的患者TNM分期改变,对T分期的影响最明显;共有19．15％（9／47）的患者临床分期改变,并改变相应的治疗决策。结论^18F—FDG PET／CT显像诊断妇科肿瘤复发、转移准确而全面,对临床再分期及治疗决策有重要影响。     

18F-FDG PET/CT显像监测胃癌术后复发转移的价值

Objective PET with 18F-fluorodeoxyglucose (FDG) has been used to beth detect and stage a variety of malignancies. The aim of this retrospective study was to evaluate the clinical value of 18F-FDG PET/CT for recurrence and metastasis in gastric carcinoma patients after total gastrectomy. Methods A total of 45 gastric carcinoma patients who underwent total gastrectomy were included. PET/CT scans were obtained for restaging. The " gold standard" of 18F-FDG PET/CT diagnostic accuracy was based on either histopathology or clinical follow-up. By using the t-test from SPSS 11.5, the cut-off of maximum standard-ized uptake values (SUVmax) from 18F-FDG to differentiate benign from malignant lesion at stomach were determined and calculated. Results (1) Of the 45 patients, 22 were suspicion recurrent lesion at stomach. Of the 22 patients, 12 were confirmed to have recurrent lesions. The diagnostic accuracy were 100.0% (12/ 12) for sensitivity, 70.0% (7/10) for specificity, and 86.4% (19/22) for accuracy, respectively. A higher SUVmax in malignant than benign lesion was noted (6.27 ± 3.42 vs 3.92 ± 2.24), though not reached to the significance (t = 1. 862, P > 0.05). (2) For extra-gastric lesion detection, the sensitivity, specificity, and accuracy for region lymph nodes were 78.9% (15/19), 92.3% (24/26), and 86.7% (39/ 45), for peritoneal spreading were 6/9, 97.2% (35/36), 91. 1% (41/45), and for distant sites were 86.7%(13/15), 93.3% (28/30), 91.1% (41/45). (3) False positive were found in eight sites. All were either inflammatory or physiological uptake at intestine. False negative were found in nine sites. Either due to small in size (less than 1.0 cm in diameter), well differentiation of the tumor cell or with a nature of signet ring. Conclusion 18F-FDG PET/CT had a potential to detect local, regional, and distant metastasis in gastric cancer.     

18F-FDG PET/CT显像监测胃癌术后复发转移的价值

Objective PET with 18F-fluorodeoxyglucose (FDG) has been used to beth detect and stage a variety of malignancies. The aim of this retrospective study was to evaluate the clinical value of 18F-FDG PET/CT for recurrence and metastasis in gastric carcinoma patients after total gastrectomy. Methods A total of 45 gastric carcinoma patients who underwent total gastrectomy were included. PET/CT scans were obtained for restaging. The " gold standard" of 18F-FDG PET/CT diagnostic accuracy was based on either histopathology or clinical follow-up. By using the t-test from SPSS 11.5, the cut-off of maximum standard-ized uptake values (SUVmax) from 18F-FDG to differentiate benign from malignant lesion at stomach were determined and calculated. Results (1) Of the 45 patients, 22 were suspicion recurrent lesion at stomach. Of the 22 patients, 12 were confirmed to have recurrent lesions. The diagnostic accuracy were 100.0% (12/ 12) for sensitivity, 70.0% (7/10) for specificity, and 86.4% (19/22) for accuracy, respectively. A higher SUVmax in malignant than benign lesion was noted (6.27 ± 3.42 vs 3.92 ± 2.24), though not reached to the significance (t = 1. 862, P > 0.05). (2) For extra-gastric lesion detection, the sensitivity, specificity, and accuracy for region lymph nodes were 78.9% (15/19), 92.3% (24/26), and 86.7% (39/ 45), for peritoneal spreading were 6/9, 97.2% (35/36), 91. 1% (41/45), and for distant sites were 86.7%(13/15), 93.3% (28/30), 91.1% (41/45). (3) False positive were found in eight sites. All were either inflammatory or physiological uptake at intestine. False negative were found in nine sites. Either due to small in size (less than 1.0 cm in diameter), well differentiation of the tumor cell or with a nature of signet ring. Conclusion 18F-FDG PET/CT had a potential to detect local, regional, and distant metastasis in gastric cancer.     

18F-FDG PET/CT显像监测胃癌术后复发转移的价值

Objective PET with 18F-fluorodeoxyglucose (FDG) has been used to beth detect and stage a variety of malignancies. The aim of this retrospective study was to evaluate the clinical value of 18F-FDG PET/CT for recurrence and metastasis in gastric carcinoma patients after total gastrectomy. Methods A total of 45 gastric carcinoma patients who underwent total gastrectomy were included. PET/CT scans were obtained for restaging. The " gold standard" of 18F-FDG PET/CT diagnostic accuracy was based on either histopathology or clinical follow-up. By using the t-test from SPSS 11.5, the cut-off of maximum standard-ized uptake values (SUVmax) from 18F-FDG to differentiate benign from malignant lesion at stomach were determined and calculated. Results (1) Of the 45 patients, 22 were suspicion recurrent lesion at stomach. Of the 22 patients, 12 were confirmed to have recurrent lesions. The diagnostic accuracy were 100.0% (12/ 12) for sensitivity, 70.0% (7/10) for specificity, and 86.4% (19/22) for accuracy, respectively. A higher SUVmax in malignant than benign lesion was noted (6.27 ± 3.42 vs 3.92 ± 2.24), though not reached to the significance (t = 1. 862, P > 0.05). (2) For extra-gastric lesion detection, the sensitivity, specificity, and accuracy for region lymph nodes were 78.9% (15/19), 92.3% (24/26), and 86.7% (39/ 45), for peritoneal spreading were 6/9, 97.2% (35/36), 91. 1% (41/45), and for distant sites were 86.7%(13/15), 93.3% (28/30), 91.1% (41/45). (3) False positive were found in eight sites. All were either inflammatory or physiological uptake at intestine. False negative were found in nine sites. Either due to small in size (less than 1.0 cm in diameter), well differentiation of the tumor cell or with a nature of signet ring. Conclusion 18F-FDG PET/CT had a potential to detect local, regional, and distant metastasis in gastric cancer.     

18F-FDG PET/CT显像监测胃癌术后复发转移的价值

Objective PET with 18F-fluorodeoxyglucose (FDG) has been used to beth detect and stage a variety of malignancies. The aim of this retrospective study was to evaluate the clinical value of 18F-FDG PET/CT for recurrence and metastasis in gastric carcinoma patients after total gastrectomy. Methods A total of 45 gastric carcinoma patients who underwent total gastrectomy were included. PET/CT scans were obtained for restaging. The " gold standard" of 18F-FDG PET/CT diagnostic accuracy was based on either histopathology or clinical follow-up. By using the t-test from SPSS 11.5, the cut-off of maximum standard-ized uptake values (SUVmax) from 18F-FDG to differentiate benign from malignant lesion at stomach were determined and calculated. Results (1) Of the 45 patients, 22 were suspicion recurrent lesion at stomach. Of the 22 patients, 12 were confirmed to have recurrent lesions. The diagnostic accuracy were 100.0% (12/ 12) for sensitivity, 70.0% (7/10) for specificity, and 86.4% (19/22) for accuracy, respectively. A higher SUVmax in malignant than benign lesion was noted (6.27 ± 3.42 vs 3.92 ± 2.24), though not reached to the significance (t = 1. 862, P > 0.05). (2) For extra-gastric lesion detection, the sensitivity, specificity, and accuracy for region lymph nodes were 78.9% (15/19), 92.3% (24/26), and 86.7% (39/ 45), for peritoneal spreading were 6/9, 97.2% (35/36), 91. 1% (41/45), and for distant sites were 86.7%(13/15), 93.3% (28/30), 91.1% (41/45). (3) False positive were found in eight sites. All were either inflammatory or physiological uptake at intestine. False negative were found in nine sites. Either due to small in size (less than 1.0 cm in diameter), well differentiation of the tumor cell or with a nature of signet ring. Conclusion 18F-FDG PET/CT had a potential to detect local, regional, and distant metastasis in gastric cancer.     

18F-FDG PET/CT显像监测胃癌术后复发转移的价值

Objective PET with 18F-fluorodeoxyglucose (FDG) has been used to beth detect and stage a variety of malignancies. The aim of this retrospective study was to evaluate the clinical value of 18F-FDG PET/CT for recurrence and metastasis in gastric carcinoma patients after total gastrectomy. Methods A total of 45 gastric carcinoma patients who underwent total gastrectomy were included. PET/CT scans were obtained for restaging. The " gold standard" of 18F-FDG PET/CT diagnostic accuracy was based on either histopathology or clinical follow-up. By using the t-test from SPSS 11.5, the cut-off of maximum standard-ized uptake values (SUVmax) from 18F-FDG to differentiate benign from malignant lesion at stomach were determined and calculated. Results (1) Of the 45 patients, 22 were suspicion recurrent lesion at stomach. Of the 22 patients, 12 were confirmed to have recurrent lesions. The diagnostic accuracy were 100.0% (12/ 12) for sensitivity, 70.0% (7/10) for specificity, and 86.4% (19/22) for accuracy, respectively. A higher SUVmax in malignant than benign lesion was noted (6.27 ± 3.42 vs 3.92 ± 2.24), though not reached to the significance (t = 1. 862, P > 0.05). (2) For extra-gastric lesion detection, the sensitivity, specificity, and accuracy for region lymph nodes were 78.9% (15/19), 92.3% (24/26), and 86.7% (39/ 45), for peritoneal spreading were 6/9, 97.2% (35/36), 91. 1% (41/45), and for distant sites were 86.7%(13/15), 93.3% (28/30), 91.1% (41/45). (3) False positive were found in eight sites. All were either inflammatory or physiological uptake at intestine. False negative were found in nine sites. Either due to small in size (less than 1.0 cm in diameter), well differentiation of the tumor cell or with a nature of signet ring. Conclusion 18F-FDG PET/CT had a potential to detect local, regional, and distant metastasis in gastric cancer.