18F-FDG PET/CT SUVmax与肺癌放疗疗效的相关性

PET/CT已广泛用于恶性肿瘤的诊断,并指导治疗计划的制定,PET功能信息与CT解剖信息融合后灵敏度和准确性提高.笔者分析了16例接受3D-CRT的NSCLC患者放疗前后18F-FDG PET/CT显像SUVmax的变化,探讨SUVmax在放疗中的应用价值.     

11C-蛋氨酸PET/CT显像在脑胶质瘤中的初步应用

目的探讨11C-蛋氨酸(MET)PET/CT显像对脑胶质瘤的应用价值.方法2例正常对照者、2例脑胶质瘤初诊患者和23例脑胶质瘤术后患者行11C-MET PET/CT显像;25例患者中有17例同时行18F-脱氧葡萄糖(FDG)PET/CT显像.临床随访时间3～17个月.结果4例脑胶质瘤术后无肿瘤残余或复发者11C-MET显像为阴性,其中3例同时行18F-FDG显像也为阴性.2例胶质瘤Ⅱ级初诊者和19例脑胶质瘤术后残余、复发者中,20例11C-MET显像阳性(肿瘤/灰质、肿瘤/白质比值分别为2.02±0.96、3.01±1.79),其中14例同时行18F-FDG显像中12例为阳性.11C-MET显像所见病灶远较18F-FDG显像清晰.14例患者11C-MET、18F-FDG显像的肿瘤/灰质、肿瘤/白质比值分别为2.15±1.16比0.97±0.43(P＜0.01)、3.31±2.16比1.90±0.67(P＜0.05).结论11C-MET对脑胶质瘤的显像、定位优于18F-FDG.     

^18F-FDG PET／CT在鼻咽癌临床分期和疗效监测中的应用

目的探讨^18F-FDGPET／CT显像在鼻咽癌首次分期、再分期及疗效监测中的临床应用价值。方法通过分析86例鼻咽癌患者^18F-FDGPET／CT扫描结果,结合其他临床资料和随访结果,计算^18F-FDGPET／CT显像的准确性、特异性、灵敏度、阳性预测值与阴性预测值,并与CT、MRI进行比较。结果^18F-FDGPET／CT与CT、MRI诊断鼻咽癌的准确率、敏感性、特异性、阳性预测值与阴性预测值的差异均有统计学意义（P〈0．05）。依据^18F-FDGPET／CT结果,改变了4例首次分期、14例再分期的临床诊断和22例患者的治疗方案。结论与CT、MRI相比,^18F-FDGPET／CT显像对鼻咽癌的临床分期及疗效监测具有更重要价值。     

胆管癌的18F-FDG PET/CT诊断价值

目的 总结胆管癌18F-FDG PET/CT显像表现,提高胆管癌的诊断准确性.方法 回顾经病理或临床综合手段证实的53例胆道疾病的18F-FDG PET/CT表现,分析PET/CT诊断胆管癌的敏感性、特异性和准确性.结果 肝内胆管癌14例、近段胆管癌18例、中远段胆总管癌15例、胆管炎性病变或伴结石6例.肝内转移9例,腹腔及腹膜后淋巴结转移15例,椎体等远处转移3例.PET/CT诊断胆管癌的敏感性为95.7％、特异性为83.3％、准确性为94.3％.结论 18F-FDG PET/CT在胆管癌的诊断与鉴别诊断、分期、检测疗效及预后等具有独特的应用价值.     

18F-FDG和18F-FET PET脑显像诊断垂体腺瘤

目的 比较^18F-脱氧葡萄糖(FDG)和^18F-酪氨酸(FET)PET显像对垂体腺瘤的诊断价值。方法 正常对照者7例同期行^18F-FDGPET脑显像和^13N-NH3PET脑血流显像。20例垂体腺瘤患者行^18F-FDG PET脑显像，其中10例同期行^18F-FETPET脑显像，并参照近期MRI结果进行分析。加例患者均行经口鼻蝶窦垂体腺瘤切除术，术后行病理检查及免疫组织化学分型。结果①正常对照组垂体^18F-FDG摄取明显低于周围组织。②对于分泌激素和无分泌功能的垂体腺瘤，^18F-FDGPET和^18F-FETPET均可显示病灶。③垂体腺瘤在^18F-FDG显像中多表现为均匀的放射性摄取增高，而^18F-FET。显像则多表现为散在的摄取增高，与MRI所示等瓦长T2或稍长瓦长T2信号的肿瘤组织分布相似。④7例微腺瘤^18F-FDG PET检出5例，MRI检出3例。⑤不同激素分泌型和无分泌功能垂体腺瘤的瘤体大小、激素水平与^18F-FDG或^18F-FET显像标准摄取值(SUV)间无明显相关。结论 ^18F-FDG和^18F-FET PET脑显像均可显示垂体腺瘤,而以前者更佳。     

~(18)F-FDG PET/CT在行结肠癌检查时发现同时性重复癌的价值

目的探讨18氟-氟脱氧葡萄糖(18F-FDG)PET/CT用于检查结肠癌时发现同时性重复癌的价值。方法回顾性分析232例经病理证实结肠癌病人的18F-FDG PET/CT影像资料和临床病理结果,采用卡方检验比较18F-FDG PET/CT结果与病理结果并行kappa系数一致性检验,分析PET/CT显像的诊断效能。结果 232例病理证实的结肠癌病人中,56例病理证实为重复癌。18F-FDG PET/CT诊断真阳性53例,假阳性4例,其中2例经肠镜病理证实分别为息肉和管状腺瘤(癌前病变),1例病理证实为甲状腺腺瘤,1例为肺炎性假瘤。假阴性3例,其中1例为胃窦部印戒细胞癌,1例为肾透明细胞癌,另1例18F-FDG PET/CT显像为高代谢,诊断为结肠癌肝转移,结果病理证实为结肠癌+原发性肝癌。18F-FDG PET/CT诊断重复癌的敏感度为94.64%,特异度为97.58%,准确度为96.83%,阳性预测值92.98%,阴性预测值98.17%。与病理诊断结果比较,两者间差异无统计学意义(P≈1.000),而且两者间一致性良好(κ=0.917,P=0.000)。结论应用18F-FDG PET/CT进行结肠癌检查时可以有效发现同时性重复癌。     

交互式胸部18F-FDG PET与CT三维容积图像融合技术的建立

目的建立可在PC机上运行的交互式胸部^18F-脱氧葡萄糖(FDG)PET与CT三维容积图像融合显示技术。方法对8例肺癌患者进行^18F-FDG PET全身显像和胸部螺旋CT检查。将PET发射和透射扫描三维容积数据和螺旋CT断层图像数据传入PC机。通过CT断层图像三维重建、像素转换、数据转换，采用胸部PET透射扫描显示解剖信息，结合^18F-FDG图像显示的病灶，以及心脏、肝脏、肾脏、脊柱骨髓等生理性显像图进行定位配准。采用交互式方式，对沿X、Y、Z轴的水平偏移量和旋转偏移角度进行调整，实现胸部PET-CT三维容积图像融合。结果8例肺癌患者，^18F-FDG PET显像共发现胸部阳性病灶25处，通过交互式PET-CT三维容积图像融合，所有病灶均在CT图像上明确定位。结论该图像融合技术对胸部^18F-FDG阳性病灶定位诊断有一定价值。     

18F-FDG PET显像在胃恶性肿瘤治疗后随访中的应用

目的评价18F-脱氧葡萄糖(FDG)PET显像在胃恶性肿瘤治疗后随访中的价值.方法回顾性分析1999年1月～2004年11月做18F-FDG PET检查的52例经病理检查确诊为胃恶性肿瘤的PET图像,其中49例患者有同期CT检查结果.PET显像结果均由病理或临床及其他影像学检查随访证实.结果①23例患者治疗后胃局部18F-FDG摄取增高,其中9例证实有肿瘤残余或局部复发,标准摄取值(SUV)为4.24±2.98.14例为生理性摄取或胃炎、吻合口炎、胃动力异常等良性摄取,SUV 2.72±0.62.两组比较差异有显著性(t=1.87,P＜0.05).②对转移灶的检出,18F-FDG PET显像和CT检查的灵敏度分别为90.0%(27/30例)、50.0%(15/30例),两者差异有显著性(X2=11.43,P＜0.005).PET显像9例与CT检查结果相符;6例PET发现的病灶多于CT;10例PET发现转移灶而CT未见异常,其中2例B超检查阳性而CT检查阴性,PET显像证实了B超所见;2例PET否定了CT提示的转移灶,但发现其他部位转移.5例仅血清肿瘤标志物水平升高,其他检查阴性,而PET显像发现转移灶.25例PET显像未发现转移灶者中有3例假阴性.结论18F-FDGPET显像对胃肿瘤治疗后残余或复发及转移灶检出率高于其他影像学检查,但特异性差.     

浅析18F-FDG PET/CT肿瘤显像前应注意的几个问题

随着18F-FDG PET/CT显著的临床价值以及临床医生对18F-FDG PET/CT检查的认可,越来越多的肿瘤患者选择了18F-FDG PET/CT检查。为了尽可能使行18F-FDG PET/CT肿瘤显像的患者感到检查的舒适性和无创性,并最大限度获得准确和高质量的影像结果,本文就患者行18F-FDG PET/CT肿瘤显像前     

11C-胆碱对18F-FDG PET/CT显像诊断鼻咽癌和肝细胞肝癌的补充价值

目的 探讨11C-胆碱(CHO) PET/CT对18F-FDG PET/CT显像诊断鼻咽癌(NPC)和HCC的补充价值.方法 将明确诊断的NPC和HCC患者纳入该研究.该研究经医院伦理委员会通过,患者均签署知情同意书.2007年12月至2010年1月,15例局部进展型NPC和76例HCC患者均行18 F-FDG PET/CT显像,其中43例(15例NPC和28例HCC)同时行局部11C-CHO PET/CT显像.病灶处出现18 F-FDG或11C-CHO高摄取者为阳性.半定量分析采用SUVmax、肿瘤/脑(T/B)比值和肿瘤/肝(T/L)比值等指标.统计学分析采用两样本t检验、x2检验、Fisher确切概率法和直线相关分析.结果 (1)在15例局部进展型NPC患者中,病灶处18F-FDG SUVmax明显高于11 C-CHO SUVmax (12.81 ±5.00与6.84±2.76;t =6.416,P＜0.01),但11C-CHO PET/CT显像T/B比值明显高于18F-FDG PET/CT显像(18.62±7.95与1.38±0.59;t=8.801,P＜0.01).2种显像剂在病灶处的摄取结果明显相关(r =0.712,P＜0.01).与18F-FDG PET/CT显像比较,11C-CHO显像改进了50.0％(12/12与6/12;x2=8.000,P＜0.05)患者颅内侵犯病灶、4/14患者颅底侵犯病灶和3/3患者眼眶侵犯病灶的显示.(2)在76例HCC患者中,63.1％ (48/76)的患者18F-FDG PET/CT显像阳性.在28例18 F-FDG PET/CT显像阴性者中,71.4％ (20/28)的患者11C-CHO PET/CT显像阳性.18F-FDG联合11C-CHO使PET/CT诊断HCC的灵敏度从63.1％(48/76)提高到89.5％ (68/76;x2=14.559,P＜0.01).与18F-FDG PET/CT显像比较,11C-CHO PET/CT显像倾向易于检出高分化HCC[6/9与35.7％(5/14);P =0.214];在检测中分化HCC方面,两者差异无统计学意义[6/7与72.0％(18/25),P=0.648].11C-CHO PET/CT显像在检测直径＜5.0 cm的HCC方面较18 F-FDG PET/CT显像灵敏[72.7％ (16/22)与42.1％ (16/38);x2=5.249,P＜0.05],特别是＜2.0 cm病灶[5/7与0/7;P=0.021].结论 11C-CHO与18F-FDG相结合可提高PET/CT对局部进展型NPC T分期诊断的准确性.11C-CHO可弥补18F-FDG显像在高中分化HCC诊断中的不足,从而提高PET/CT的诊断灵敏度.     

18F-FLT与18F-FDG PET/CT对非小细胞肺癌淋巴结分期的比较

目的 比较3′-脱氧-3′-18F-FLT与18F-FDG PET/CT对NSCLC淋巴结分期的诊断价值,探讨肿瘤FLT和FDG摄取与细胞周期蛋白Cyclin D1表达的相关性.方法 选择手术治疗的NSCLC患者31例,男22例,女9例,年龄38～84岁.术前2周内行18F-FLT和18F-FDG PET/CT检查,术后行病理和转移淋巴结的免疫组织化学Cyclin D1检测.以病理诊断为“金标准”,评价18F-FLT和18F-FDG PET/CT显像对NSCLC的诊断价值.应用SPSS 12.0软件,计数资料行,检验,组间SUV.差异行方差分析,SUV.与Cyclin D1的表达行直线相关分析.结果 FLT和FDG PET/CT对NSCLC原发灶诊断的灵敏度分别为74.2％(23/31)和93.5％ (29/31),二者差异有统计学意义(x2=4.29,P =0.038).FLT PET/CT对NSCLC区域淋巴结诊断的灵敏度、特异性、准确性和阳性预测值分别为65％(39/60)、98％ (291/296)、93％(330/356)和85％(39/46),FDG PET/CT则分别为85％(51/60)、84％(249/296)、84％(300/356)和52％(51/98),二者差异有统计学意义(x2值分别为6.40、32.89、12.40、14.32和2.98,P均＜0.05).对于N分期,FLT PET/CT能使77.4％(24/31)的NSCLC患者分期正确,6.5％(2/31)的患者分期过高(假阳性),16.1％(5/31)的患者分期过低(假阴性);而FDG PET/CT相应数据则分别为77.4％(24/31)、16.1％(5/31)和6.5％(2/31).原发灶18F-FLT SUVmax与肿瘤组织Cyclin D1表达呈正相关(r=0.644,P＜0.01),FDG SUVmax则无相关性(r=0.293,P＞0.05).临床分期越晚,FLT SUVmax越高(F=12.2,P＜0.05),但FDG SUVmax则无此趋势(F=3.1,P＞0.05);二者在不同病理类型、分化程度之间差异无统计学意义(F=1.1、0.6、0.8和1.1,P均＞0.05).结论 与FDG PET/CT相比,FLT PET/CT对NSCLC淋巴结分期过低的患者多,而分期过高的患者少;对区域淋巴结诊断灵敏度降低,但有更高的特异性、准确性和阳性预测值.肿瘤FLT摄取与细胞周期蛋白Cyclin D1的表达有相关性.     

The additional value of FDG PET imaging for distinguishing N0 or N1 from N2 stage in preoperative staging of non-small cell lung cancer in region where the prevalence of inflammatory lung disease is high

PURPOSE: The aim of this study was to evaluate the efficacy of PET imaging and compare it with the performance of CT in mediastinal and hilar lymph node staging in potentially operable non-small cell lung cancer (NSCLC). METHODS: Fifty-nine patients with potentially resectable NSCLC who underwent preoperative PET and CT imaging were enrolled into this prospective study. All patients underwent surgical evaluation by means of mediastinoscopy with mediastinal lymph node sampling (14 patients) or thoracotomy (45 patients). RESULTS: The prevalence of lymph node metastases was 53%. Overall, the sensitivity, specificity, accuracy, PPV, and NPV of PET were 79%, 76%, 78%, 86%, and 76% for N0 and N1 lymph nodes and 76%, 79%, 80%, 67%, and 83% for N2 lymph nodes, while those values for CT were 66%, 43%, 58%, 68%, and 43% for N0 and N1 stations and 43%, 66%, 54%, 41%, and 66% for N2 lymph nodes, respectively. PET correctly differentiated cases with mediastinal lymph node involvement (N2) from those without such involvement (N0 or N1) in 76% of cases. Statistical analysis of the diagnostic accuracy of nodal involvement showed that PET improves diagnostic accuracy significantly in the detection of both N0 or N1 and N2 status in the individual patient based on analysis, compared with CT (P < 0.01 and P < 0.01, respectively). When preoperative nodal staging was compared with postoperative histopathological staging, 38 (65%) patients were correctly staged, 9 (15%) were overstaged, and 12 (20%) were understaged by PET, while 29 patients (49%) were correctly staged, 13 (22%) were overstaged, and 17 (29%) were understaged by CT. CONCLUSION: It has been clearly shown that PET is more accurate than CT for the differentiation of N0 or N1 from N2 disease in patients with NSCLC. However, PET imaging alone does not appear to be sufficient to replace mediastinoscopy for mediastinal staging in patients with lung cancer, especially in geographic regions with high granulomatous or inflammatory mediastinal disease prevalence.     

FDG-PET scan in potentially operable non-small cell lung cancer: do anatometabolic PET-CT fusion images improve the localisation of regional lymph node metastases?

Exact localisation of thoracic lymph nodes (LNs) on fluorine-18 fluoro-2-deoxy-d-glucose positron emission tomography (FDG-PET) can be hampered by the paucity of anatomical landmarks. In non-small cell lung cancer (NSCLC) patients referred for locoregional LN staging, we prospectively examined to what extent localisation of LNs at PET reading could be improved by visual correlation with computed tomography (CT), or by anatometabolic PET+CT fusion images. Fifty-six patients with potentially operable NSCLC underwent CT, PET and surgical staging. Prospective reading was performed for CT, PET without CT, PET+CT visual correlation and PET+CT fusion. Reading was blinded to surgical pathology data and noted on a standard LN map. Surgical staging was available for 493 LN stations. In the evaluation per individual LN station, CT was accurate in 87%, PET in 91% and visual correlation and fusion in 93%. In the identification of the nodal stage, CT was correct in 28/56 patients (50%), PET in 37/56 (66%), visual correlation in 40/56 (71%), and fusion in 41/56 (73%). It is concluded that in the exact localisation of metastatic thoracic LNs, the accuracy of reading of PET is increased if the PET images can be visually correlated with CT images. PET+CT anatometabolic fusion images add only a marginal benefit compared with visual correlation. Received 19 May and in revised form 25 July 1998     

^11C—MET和^18F—FDG PET／CT诊断胶质瘤术后残余或复发的比较

目的探讨^11C甲基蛋氨酸（MET）PET／CT对胶质瘤术后残余或复发病灶的诊断价值,并与^18F-FDG进行比较。方法46例胶质瘤术后患者均行^11C—MET和^18F-FDGPET／CT颅脑显像,2次显像间隔时间在5d内。采用ROI技术计算肿瘤与对侧灰质和白质比值。胶质瘤残余或复发病灶的诊断根据手术或立体定向活组织病理学检查、MRI、CT等影像学检查及临床随访,随访时间〉6个月。统计学比较采用z。检验或独立样本t检验。结果46例胶质瘤术后患者中残余或复发者36例。^11C-MET、^18F-FDGPET／CT显像对残余或复发病灶诊断的灵敏度分别为94．4％（34／36）、47．2％（17／36）,χ2=19．429,P〈0．001;特异性分别为90．0％（9／10）、100％（10／10）,χ2＝1．053,P〉0．05;准确性分别为93．5％（43／46）、58．7％（27／46）,χ2=15．294,P〈0．001。半定量分析：^11C—MET肿瘤／灰质比值为1．68±0．23,明显高于^18F—FDG的1．13±0．51（t=5．877,P〈0．001）,^11C—MET肿瘤／白质比值为2．52±0．28,明显高于^18F—FDG的1．42±0．57（t=10．470,P〈0．001）。结论^11C-METPET／CT显像对胶质瘤术后残余或复发病灶的诊断具有一定的临床价值,并优于^18F—FDGPET／CT显像。     

肺癌术前18F-FDG PET/CT对纵隔淋巴结外科分期的临床价值

目的 探讨肺癌术前18F-FDG PET/CT对纵隔淋巴结转移外科分期的诊断价值.方法 回顾分析68例肺癌患者术前18F-FDG PET/CT及CT对纵隔淋巴结转移的诊断及分期结果,并与术后病理结果对照.统计学分析采用x2检验和t检验.结果 68例患者共切除纵隔淋巴结222枚,其中84枚(37.8％)病理检查证实为转移.18F-FDG PET/CT与CT诊断纵隔淋巴结转移的灵敏度、特异性、准确性、阳性及阴性预测值分别为71.4％(60/84)、66.7％(92/138)、68.5％(152/222)、56.6％(60/106)、79.3％(92/116)与48.8％(41/84)、49.3％(68/138)、49.1％(109/222)、36.9％(41/111)、61.3％(68/111),差异均有统计学意义(x2=8.96、8.57、17.19、8.43及8.88,P均＜0.05);18F-FDG PET/CT与CT对纵隔淋巴结的分期与病理分期的一致率分别为73.5％(50/68)及41.2％(28/68),差异有统计学意义(x2=14.55,P＜0.01);其中18F-FDG PET/CT对N1及N2期淋巴结诊断的准确性分别为66.7％ (10/15)和79.2％ (19/24),明显高于CT的13.3％ (2/15)和45.8％(11/24)x2=8.89和5.69,P均＜0.05.淋巴结短径≥10 mm组SUVmax明显高于短径＜10 mm组(5.5±2.8与2.2±0.9,t=5.17,P＜0.05).结论 术前18F-FDG PET/CT对肺癌纵隔淋巴结的诊断和分期优于CT,其对适宜手术病例优化治疗决策具有临床指导意义.     

18F-FDG PET/CT对非小细胞肺癌淋巴结分期诊断价值的研究进展

非小细胞肺癌（NSCLC）准确的淋巴结分期是确定患者治疗方案的重要因素。18F-FDG PET/CT作为一种同时包含功能代谢与解剖形态信息的高端影像学诊断方法,在NSCLC淋巴结分期（N分期）中呈现出较高的诊断准确率。大量研究已基本证实哪些是影响NSCLC纵隔淋巴结转移的危险因素,笔者主要就近年为提高NSCLC淋巴结分期准确性而探索出的新参数、新技术进行综述。     

Non-small cell lung cancer: dual-modality PET/CT in preoperative staging

PURPOSE: To determine the accuracy of dual-modality positron emission tomographic (PET)-computed tomographic (CT) imaging, as compared with PET alone and CT alone, in the staging of non-small cell lung cancer (NSCLC). MATERIALS AND METHODS: Twenty-seven patients with NSCLC underwent staging with combined fluorine 18 fluorodeoxyglucose PET and CT. CT, PET, and coregistered PET/CT images were evaluated separately by two different physicians for each imaging modality, and disease stage was determined by using TNM and American Joint Committee on Cancer staging systems. Histopathologic results served as the reference standard. The statistical significance of differences among CT, PET, and PET/CT was determined by using the McNemar test. RESULTS: Overall tumor stage was correctly classified as 0-IV with CT in 19 patients, with PET in 20 patients, and with PET/CT in 26 patients. PET/CT findings when compared with PET findings led to a treatment change for four patients (15%) and when compared with CT findings led to a treatment change for five patients (19%). Differences in the accuracy of overall tumor staging between PET/CT and CT (P =.008) and between PET/CT and PET (P =.031) were significant. Primary tumor stage was correctly determined in more patients with PET/CT than with either PET alone or CT alone. Sensitivity, specificity, positive predictive value, negative predictive value, and accuracy of regional lymph node staging, respectively, were 89%, 94%, 89%, 94%, and 93%, with PET/CT; 89%, 89%, 80%, 94%, and 89% with PET; and 70%, 59%, 50%, 77%, and 63% with CT. Fourteen distant metastases were detected in four patients with CT, four were detected in two patients with PET, and 17 were detected in four patients with PET/CT. CONCLUSION: Use of dual-modality PET/CT significantly increases the number of patients with correctly staged NSCLC and thus has a positive effect on treatment.     

Low dose non-enhanced CT versus standard dose contrast-enhanced CT in combined PET/CT protocols for staging and therapy planning in non-small cell lung cancer

PURPOSE: To evaluate low dose non-enhanced CT and standard dose contrast-enhanced CT in combined PET/CT protocols for staging and therapy planning of non-small cell lung cancer (NSCLC). METHODS: Retrospective analysis was performed of 50 consecutive patients with proven NSCLC who had been referred for primary staging (n=41) or restaging (n=9). All patients underwent a multi-phase PET/CT consisting of a low dose non-enhanced attenuation scan and an arterial and portal-venous contrast-enhanced CT scan followed by whole-body PET. Fused datasets of non-enhanced and contrast-enhanced PET/CT were compared per patient by using the TNM staging system, and per lesion regarding localisation, characterisation and delineation of tumour lesions. The staging results were validated either by histopathology or by clinical-radiological follow-up for >or=6 months. RESULTS: In 47/50 patients, the results of T staging did not differ between the two PET/CT protocols. Three patients could only be correctly classified as having T4 tumours after contrast application. Regarding N staging, both protocols yielded the same results. In M staging, there was only one patient with an improvement of the results as a result of contrast application. The lesion-based analysis of 92 sites showed no difference in the accuracy of lesion localisation and only one revision of lesion characterisation by contrast-enhanced PET/CT. The assessment of tumour delineation was altered by contrast application in 58/92 sites (p<0.0001). In 10/50 patients, contrast-enhanced PET/CT detected additional clinically important findings. CONCLUSION: In patients with advanced NSCLC, contrast-enhanced CT as part of the PET/CT protocol more accurately assessed the TNM stage in 8% of patients compared with non-contrast PET/CT. However, for planning of 3D conformal radiotherapy and non-conventional surgery, contrast-enhanced PET/CT protocols are indispensable owing to their superiority in precisely defining the tumour extent.     

^18F-FDG PET／CT在自然杀伤／T细胞淋巴瘤显像诊断及分期中的应用

目的探讨^18F-脱氧葡萄糖（FDG）PET／CT在自然杀伤（NK）／T细胞淋巴瘤的病灶检测及分期中的价值。方法13例初诊和2例复发NK／T细胞淋巴瘤患者行全身^18F-FDGPET／CT显像。病灶处出现^18F-FDG异常浓聚为阳性。^18F-FDG摄取采用最大标准摄取值（SUVmax）进行定量。所有受检者随访时间均〉6个月。统计学比较用t检验。结果（1）15例NK／T细胞淋巴瘤患者^18F-FDG PET／CT显像均为阳性。11例鼻型患者中,10例PET／CT于鼻腔或鼻咽部探测到肿瘤病灶,且6例突出鼻腔外侵及鼻旁周围组织,7例PET／CT显像于鼻腔外发现1处或多处淋巴瘤受侵病灶。4例非鼻型患者,PET／CT于鼻腔外发现多部位肿瘤侵犯。鼻内、鼻外病灶的SUVmax分别为12．42±9．25和9．54±7．12,两者差异无统计学意义（t=1．120,P〉0．05）。（2）15例中有2例显像前不明原因发热者在PET／CT引导下行病理检查,明确诊断。13例诊断已明确者,7例PET／CT发现更多淋巴瘤病灶,6例因PET／CT检查改变分期。Ⅰ～Ⅱ期患者的SUVmax;稍低于Ⅲ～Ⅳ期者,分别为8．44±5．56和10．32±7．80,但差异无统计学意义（t=0．757,P〉0．05）。结论NK／T细胞淋巴瘤病灶呈^18F-FDG高摄取;在其病灶检测和分期方面,PET／CT显像有优势。     

多排螺旋CT在胃癌术前TN分期中的应用价值

目的:利用多层螺旋CT(MDCT),前瞻性的对胃癌进行术前TN分期,并与术后病理结果对照,评估其分期的准确性及临床价值。方法:对经胃镜证实的48例胃癌患者,于术前进行MDCT三期动态增强扫描。分别利用CT轴位图像和轴位结合多层面重组(MPR)图像对胃癌进行TN分期,并将CT分期结果与术后病理结果相对照,分期的准确性比较采用McNemar检验,取P<0.05为检验标准。结果:轴位和轴位结合MPR对胃癌病灶的检出率分别为91.6%(44/48)、97.9%(47/48)。轴位和轴位结合MPR对所有患者胃癌胃壁浸润深度(T分期)评估的准确率的分别为72.9%(35/48)、89.5%(43/48),两者之间差异具有统计学意义(P=0.041)。轴位和轴位结合MPR对所有患者转移淋巴结(N分期)评估的准确率的分别为72.9%(35/48)、77.1%(37/48),两者之间差异没有统计学意义(P=0.113)。结论:MDCT能对胃癌术前TN分期做出较准确的评估。MPR能显著改善胃癌T分期的准确率,但不能明显提高N分期的准确率。