Glucose corrected standardized uptake value (SUVgluc) in the evaluation of brain lesions with 18F-FDG PET

Purpose

To retrospectively assess the utility of ¹⁸F fluorodeoxyglucose (FDG) positron emission tomography (PET) images of standardized uptake values corrected for blood glucose (SUV_gluc), and to compare this to various quantitative methods to identify the presence or absence of high grade malignancy.

Methods

A retrospective review in 42 patients, found 81 central nervous system (CNS) lesions. Fifty one were malignant and 30 were benign or post treatment changes based on pathology (n?=?32) and on clinical outcome (n?=?49). Dynamic FDG PET scans were processed to generate parametric images of SUV_gluc, SUV, glucose metabolic rate (GMR), and lesion to cerebellum ratios (SUV_Rc), and contralateral white matter ratios (SUV_Rw). The SUV_gluc was calculated from $ {{{\mathrm{SU}{{\mathrm{V}}_{\max }}*\mathrm{BG}}} \left/ {{\left[ {100\,\mathrm{mg}/\mathrm{dl}} \right]}} \right.} $ , where SUV_max is the maximum SUV and BG is the blood glucose level (mg/dL).

Results

Using a malignant threshold for SUV_gluc of 4.5 and GMR of 13.0 μmole/min/100 g, the accuracies were similar for the SUV_gluc (80 %) and GMR (81 %) and were higher than the conventional SUV_max (73 %). The area under the receiver operating characteristic (ROC) curve for the SUV_gluc (0.8661) was better than that for the SUV_max (0.7955) (p?<?0.02) and was similar to those of the GMR (0.8694), SUV_Rc (0.8278), and SUV_Rw (0.8559).

Conclusion

These results suggest that the SUV_gluc may assist in the interpretation of FDG PET brain images in patients with CNS lesions. The SUV_gluc method avoids the complexity of kinetic modeling and the definition of a reference region.     

Glucose-normalized standardized uptake value from (18)F-FDG PET in classifying lymphomas.

Our objective was to derive the best glucose sensitivity factor (g-value) and the most discriminating standardized uptake value (SUV) normalized to glucose for classifying indolent and aggressive lymphomas. METHODS: The maximum SUV obtained from (18)F-FDG PET over the area of biopsy in 102 patients was normalized by serum glucose ([Glc]) to a standard of 100 mg/dL. Discriminant analysis was performed by using each SUV(100) (SUV x {100/[Glc]}(g), calculated using various g-values ranging from -3.0 to 0, one at a time) as a variable against the lymphoma grades, and plotting the percentage of correct classifications against g (g-plot) to search for the best g-value in normalizing SUV(100) for classifying grades. To address the influence of the extreme glucose conditions, we repeated the same analyses in 12 patients with [Glc] < or = 70 mg/dL or [Glc] > or = 110 mg/dL. RESULTS: SUV(100) correctly classified lymphoma grades ranging from 62% to 73% (P < 0.0005), depending on the g-value, with a maximum at a g-value of -0.5. For the subgroup with extreme glucose values, the g-plot also revealed higher and more optimal discrimination at a g-value of -0.5 (92%) than at a g-value of 0 (83%) (P = 0.03). The discrimination deteriorated at g < -1 in both analyses. The box plot for all cases using a g-value of -0.5 showed little overlap in classifying lymphoma grades. For a visually selected threshold SUV(100) of 7.25, the sensitivity, specificity, and accuracy of identifying aggressive grades were 82%, 79%, and 81%, respectively. CONCLUSION: The results suggest that metabolic discrimination between lymphoma grades using a glucose-normalized SUV from (18)F-FDG PET is improved by introducing g-value as an extra degree of freedom.     

18F-FDG PET/CT检查中腹腔积液SUV对不明原因腹腔积液的辅助诊断价值

目的 分析良恶性腹腔积液患者18 F-FDG PET/CT显像特点,探讨腹腔积液SUV对不明原因腹腔积液的辅助诊断价值.方法 回顾性分析首次18 F-FDG PET/CT检查前病因不明、但随访诊断明确的腹腔积液患者55例,其中男24例,女31例,年龄23～82(平均54.8)岁;良性腹腔积液19例,恶性腹腔积液36例.测定良恶性腹腔积液的SUV,并计算其与正常肝脏SUV的比值(T/NT).比较PET/CT肿瘤定位诊断、腹腔积液代谢判定及细胞学检查三者的诊断效能.采用两样本t检验、x2检验或确切概率法分析数据.结果 恶性腹腔积液患者18F-FDG PET/CT显像示腹腔积液代谢升高,MIP图像呈肝脾“淹没征”.恶性腹腔积液的SUVmax及SUVmax.分别为1.78±0.65和1.37±0.38,良性腹腔积液的相应值分别为1.11 ±0.36和0.72±0.22,前者明显高于后者(t=4.13、6.82,均P＜0.05).恶性腹腔积液的T/NT值明显高于良性腹腔积液(基于SUVmax的T/NT值:0.64±0.20与0.48±0.12,t=3.27;基于SUVmean.的T/NT值:0.68±0.17与0.38±0.10,t=7.21,均P＜0.05).根据腹腔积液代谢诊断恶性腹腔积液的灵敏度、特异性及准确性分别为75.0％(27/36)、94.7％(18/19)和81.8％(45/55),其灵敏度及准确性明显高于腹腔积液细胞学检查[44.4％(16/36)与63.6％(35/55);X2=6.98和4.58,均P＜0.05],其特异性明显高于PET/CT肿瘤定位诊断[63.2％ (12/19)X2=5.70,P＜0.05].结论 腹腔积液代谢升高对恶性腹腔积液的辅助诊断具有重要价值,18 F-FDG PET/CT阅片分析应密切结合腹腔积液SUV及与肝脏的T/NT值,以进一步提高对不明原因腹腔积液的良恶性鉴别诊断效率.     

Reproducibility of standardized uptake value measurements determined by 18F-FDG PET in malignant tumors

18F-FDG PET is increasingly being used to monitor the early response of malignant tumors to chemotherapy. Understanding the reproducibility of standardized uptake values (SUVs) is an important prerequisite in estimating what constitutes a significant change. METHODS: Twenty-six patients were studied on 2 separate occasions (mean interval +/- SD, 3 +/- 2 d; range, 1-5 d). A static PET/CT scan was performed 94 +/- 9 min after the intravenous injection of 383 +/- 15 MBq of 18F-FDG. Mean and maximum SUVs (SUVmean and SUVmax, respectively) were determined for regions of interest drawn around the tumor on the first study and for the same regions of interest transferred to the second study. RESULTS: SUVmean in tumors ranged from 1.49 to 17.48 and SUVmax ranged from 2.99 to 24.09. The correlation between SUVmean determined on the 2 separate visits was 0.99; the mean difference between the 2 measurements was 0.01 +/- 0.27 SUV. The 95% confidence limits for the measurements were +/-0.53. For SUVmax, the mean difference was -0.05 +/- 1.14 SUV. CONCLUSION: Our study demonstrates that repeated measurements of SUVmean performed a few days apart are highly reproducible. A decrease of 0.5 in the SUV is statistically significant.     

Influence of reconstruction iterations on 18F-FDG PET/CT standardized uptake values.

The goal of this study was to evaluate the effect on the average standardized uptake value (avgSUV) and maximum standardized uptake value (maxSUV) of changing the number of iterations in the reconstruction process on studies acquired with PET/CT. METHODS: Data from 50 human tumors were acquired on a PET/CT scanner, using the CT portion for attenuation correction. Reconstruction was performed using the 2-dimensional reconstruction method of ordered-subsets expectation maximization (OSEM) with 28 subsets and with 1, 2, 3, 4, 5, 10, 20, and 40 iterations. The standardized uptake value (SUV) of the studies was analyzed by positioning a region of interest tightly around the tumor and reproducing the same area on all same-study iterations for SUV measurements. RESULTS: The differences in mean avgSUV and mean maxSUV were statistically different across different iteration groups. SUV data demonstrated that the avgSUV measurements have the most significant differences between 1 versus 2 iterations and 2 versus 3 iterations. The P values for these comparisons were less then 0.001. For maxSUV, all differences had P values less than 0.001. There also was a systematic increase in the SUVs as the number of iterations increased. The avgSUV increased at early iterations (less than 5), with just 50%-60% increasing after 5 iterations. However, maxSUV increased systematically at early iterations, and this trend continued as the number of iterations increased. CONCLUSION: The OSEM algorithm converges sooner for avgSUV than for maxSUV. The likely reason is that avgSUV depends on low-frequency features that are recovered with fewer iterations. The differences in maxSUV were likely due to noise, which increased with the number of iterative updates, and to increased resolution and recovery of high-frequency features (i.e., tumor heterogeneity) with a larger number of iterations. Factors that determine the quantitative accuracy of iterative reconstruction may have played an additional role. Given the continued change in maxSUV with iterations, great care must be taken in selecting the number of iterative updates when using it to assess tumors and their response to chemotherapy and radiation therapy. Because 2-5 iterations with 8-28 subsets are being used in clinical settings, these data are pertinent when comparing the SUVs of a tumor before and after therapy.     

18F-FDG PET/CT最大标准摄取值联合HRCT在肺癌诊断中的价值和影响因素分析

目的 探讨18F-FDG PET/CT联合高分辨率CT(HRCT)诊断肺癌的价值和主要影响因素.方法 回顾分析2010年8月至2011年8月因肺实性病灶行18F-FDG PET/CT检查及肺部HRCT扫描的122例患者资料,所有病例均经病理证实或影像学检查随访8个月以上确诊.利用x2检验对HRCT上不同影像特征在良恶性病变中的构成比差异进行比较,单因素方差分析比较不同病理类型病灶的SUVmax差异,多因素logistic回归分析SUVmax及HRCT影像特征等影响因素,探讨最佳SUVmax诊断界值和18F-FDG PET/CT对肺癌的诊断价值.结果 122例肺实性病灶患者中,恶性82例,良性40例.肺癌HRCT影像特征中前3位依次为毛刺征64.6％ (53/82)、分叶征63.4％(52/82)和胸膜牵拉征39.0％(32/82),高于在良性病变中的比例(x2=19.08、30.89、10.88,均P＜0.01).肺部鳞状细胞癌(简称鳞癌)、小细胞癌和腺癌的SUVmax依次为12.57±4.34、10.66±2.90和8.19±6.01,与肺部良性病变SUVmax (3.01±3.62)相比差异有统计学意义(F =20.83,P＜0.01).不同病理类型肺癌SUVmax从大到小依次为鳞癌、小细胞癌和腺癌,其中鳞癌与腺癌SUVmax差异有统计学意义(P＜0.01);SUVmax的ROC AUC为0.863,SUVmax界值2.99和2.50对肺癌诊断的灵敏度、特异性分别为89.0％(73/82)、75.0％ (30/40)和91.5％ (75/82)、65.0％(26/40);诊断一致性SUVmax 2.99优于SUVmax 2.50,Kappa值分别为0.644和0.597.多因素logistic回归分析显示SUVmax 2.99的诊断比值比(OR)优于SUVmax 2.50的OR,分别为5.42和3.93;SUVmax (OR=5.42,P=0.01)、肿瘤最大径(OR=7.27,P=0.02)、毛刺征(OR =7.70,P＜0.01))和分叶征(OR=12.38,P＜0.01)均为肺癌与良性病灶鉴别诊断有统计学意义的影响因素.结论 SUVmax对肺癌的诊断和鉴别诊断有较高价值.18F-FDGPET/CT联合HRCT诊断肺实性病灶时,SUVmax、肿瘤最大径、毛刺征和分叶征为其鉴别诊断的主要影响因素.     

Dynamic whole-body 18F-FDG PET for differentiating abnormal lesions from physiological uptake

European Journal of Nuclear Medicine and Molecular Imaging - Serial assessment of visual change in 18F-FDG uptake on whole-body 18F-FDG PET imaging was performed to differentiate pathological...     

^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双时相显像对肺部病灶的定性诊断价值

Objective The aim of this study was to evaluate the value of dual-time point 18F-fluorodeoxyglucose (FDG) PET imaging for the differentiation between pulmonary malignant and benign lesions.Methods Seventy-eight patients with clinically suspected lung cancer underwent dual-time point 18F-FDG PET imaging.The maximum standardized uptake value(SUVmax)was calculated for PET imaging of both time points,and the change in SUVmax(△SUV)was defined as the ratio of the increase in SUVmax between early and delayed scans to the SUVmax in the early scan.The final diagnoses were confirmed by histopathology,bacteriology or clinical follow-up.The t-test was used to compare SUVmax,△SUV of benign and malignant groups.The receiver operating characteristic(ROC)curve was used to evaluate the diagnostic value of SUVmax and △SUV for pulmonary lesions.Results (1)There were 60/78 patients with pulmonary malignant lesions and 18/72 patients with benign lesions including 16 with hyperplasia lesions.There was significant difference in the SUVmax between early scan and delayed scan in both malignant group(7.94±4.17 and 9.92±5.33,respectively,t=10.19,P＜0.01)and benign group(7.21±5.74 and 8.54±6.61,respectively,t=8.23,P＜0.01).There was no significant difference in the SUVmax between malignant group and benign group in both early scan(t=0.60,P＞0.05)and delayed scan(t=0.91,P＞0.05).The △SUV was not significantly difierent between malignant and benigh groups [(26.04± 14.73)%and(18.09±24.09)%,respectively,t=1.67,P＞0.05].The SUVmax decreased in only 2 of 18 benign lesions,and no SUVmax decrease in all of the malignant lesions.(2)The sensitivity,specificity,accuracy,positive predictive value and negative predictive value with a threshold of SUVmax ＞2.5 and △SUV＞20%were respectively 93.33%(56/60),22.22%(4/18),76.92%(60/78),80.00%(56/70)and 50.00%(4/8);and 63.33%(38/60),50.00%(9/18),60.26%(47/78),80.85%(38/47)and 70.97%(22/31).The areas under the ROC curves were 0.61(Z=1.38,P＞0.05)and 0.56(Z=0.65,P＞0.05)according to the SUVmax and △SUV respectively,and the difference was not statistically significant.Condusiom Dual-time point 18F-FDG PET imasing is not useful for differentiating pulmonary malignancy from the benign lesions of hyperplasia.However,if SUVmax decreases on delayed scan,the lesion is more likely to be benign.     

Comparison of lesion-to-cerebellum uptake ratios and standardized uptake values in the evaluation of lung nodules with 18F-FDG PET

OBJECTIVE: To evaluate the clinical performance of the lesion-to-cerebellum uptake ratio (LCR), a semiquantitative index for differentiating malignant from benign lung nodules with [F]fluorodeoxyglucose positron emission tomography (F-FDG PET). METHODS: Thirty-six patients (16 females, 20 males; median age, 73 years; range, 41-87 years) with 42 known or suspected malignant lung nodules underwent whole-body PET imaging after an intravenous injection of a mean dose of 543+/-69 MBq (14.7+/-1.9 mCi) of F-FDG. The standardized uptake value (SUV) and the LCR were calculated for each nodule and receiver operating characteristic (ROC) curves were analysed using the ROCKIT 0.9B software package. RESULTS: Surgical pathology and follow-up with serial computed tomography scans for at least 24 months revealed 18 malignant lung lesions and 24 benign lesions less than 3.0 cm in size. The mean LCR was 0.70+/-0.40 for malignant nodules and 0.23+/-0.12 for benign nodules (P<0.001, two-tailed test). The area under the estimated ROC curve was 0.8660 for SUV data and 0.9197 for LCR data (P=0.2408, two-tailed test). CONCLUSIONS: The LCR method appears to be a valuable semiquantitative index for the evaluation of malignancy in pulmonary nodules with F-FDG PET, which is simple to perform clinically and does not require accurate measurements of body weight or the residual activity in the syringe utilized for F-FDG injection.     

18F-FDG PET of pulmonary embolism

OBJECTIVE: The purpose of this study was to describe the manifestations of pulmonary embolism on 18F-FDG PET scans in 13 patients. CONCLUSION: The activity of acute pulmonary embolism on FDG PET scans was significantly higher than the activity of vessels not containing thrombi. The shape of the abnormal FDG uptake may be focal or curvilinear.     

18F-FDG PET/CT显像诊断心包恶性病变的价值

Objective To assess the value of integrated 18 F-fluorodeoxyglucose (FDG) PET/CT in differentiation of malignant and benign pericardial effusion. Methods 18F-FDG PET/CT were performed in 23 patients with pericardial effusion. The detected soft tissue tumor or nodulous lession in pericardium or the thickened pericardium, with the maximum standardized uptake value( SUVmax ) ≥2.5, was defined as PET/CT-positive. The invaded lession in pericardium with SUVmax ≥2.5 was also as the positive. The difference of SUVmax of benign and malignant lesions was analyzed with two-independent-sample test of nonparametric tests. The final diagnosis was confirmed by biopsy or post-operative pathology. Results The diagnosis were confirmed with 14 malignant and 9 benign lesions. The median of SUVmax was 6.0 in malignancy group and 2.2 in benign group (z= -3. 279, P =0.001 ). According to the pathology results, there were one false negative case and two false positive cases with PET/CT imaging interpretation. The sensitivity, specificity,accuracy, positive predictive value ( PPV ) and negative predictive value ( NPV ) of 18 F-FDG PET/CT in diagnosis of benignity or malignance of pericardium effusion were 92.9% ( 13/14), 7/9, 87.0% (20/23),86.7% (13/15) and 7/8, respectively. Conclusion For the patients with pericardium effusion 18F-FDG PET/CT may be a helpful modality for malignancy differentiation     

18F-FDG PET/CT显像诊断心包恶性病变的价值

目的 评价18F-脱氧葡萄糖（FDG）PET/CT对心包恶性病变的诊断价值.方法 对23例心包积液患者进行18F-FDG PET/CT显像,并采用两独立样本非参数检验分析良恶性病灶最大标准摄取值（SUVmax）差异有无统计学意义.结果 经病理检查证实恶性心包积液14例,良性心包积液9例.1例PET/CT假阴性,2例PET/CT假阳性.18F-FDG PET/CT鉴别诊断良恶性心包积液的灵敏度、特异性、准确性、阳性预测值、阴性预测值分别为92.9%（13/14）、7/9、87.0%（20/23）、86.7%（13/15）和7/8.良、恶性病变的SUVmax中位值分别为2.2和6.0,两者间比较差异有统计学意义（z=-3.279,P=0.001）.结论 18F-FDG PET/CT是评价心包恶性病变较好的无创性手段,对良恶性心包积液的诊断与鉴别诊断有一定临床价值.     

^18F-FDG符合线路显像最大标准摄取值在胃癌评估中的价值

目的研究^18F—FDG符合线路显像SUVmax在胃癌评估中的意义。方法回顾性分析92例胃部疾病患者[男60例,女32例,平均年龄65（32～85）岁;其中胃癌78例]。78例胃癌中,残胃癌3例、原发性胃癌75例（Eis期4例、T1期13例、T2期9例、T3期33例、T4期11例,5例未手术）;高分化腺癌22例,中分化腺癌15例,低分化腺癌28例。采用ROI技术分析图像并计算SUVmax,分别用视觉法与SUVmax分析^18F—FDG符合线路显像资料,并以组织病理学或活组织检查结果为标准计算两者检验效能。使用ROC曲线分析评价SUVmax;采用Pearson相关分析评估SUVmax与病灶大小的关系,Wilcoxon秩和检验分析SUVmax在进展期胃癌和早期胃癌的差异,Kruskal—Wallis检验分析SUVmax与不同分化程度腺癌的关系。结果^18F—FDG符合线路显像视觉法与SUVmax诊断胃癌的灵敏度均为64．1％（50／78）,特异性均为64．3％（9／14）,准确性均为64．1％（59／92）。SUVmax ROCAUC为0．695,最佳临界值为0．700;SUVmax与病灶最大径呈正相关（r=0．489,P〈0．001）,Tis-1期病灶SUVmax（0．676±1．288）与L～4期SUVmax（3．851±3．764）差异有统计学意义（Z=-3．754,P〈0．001）,而高、中、低分化腺癌间SUVmax（分别为2．805±4．008,3．447±2．365,3．413±3．737）差异无统计学意义（X2=2．459,P〉0．05）。结论在^18F-FDG符合线路显像评估胃癌中,SUVmax较视觉法提供了更多的信息,但其与胃癌T分期、组织学类型、分化程度等的关系需进一步研究。     

18F-FDG PET/CT显像SUVmax与嗜铬细胞瘤恶性程度的相关性探讨

目的 分析嗜铬细胞瘤18 F-FDG PET/CT显像SUVmax与血浆游离甲氧基肾上腺素(MN)、甲氧基去甲肾上腺素(NMN)及131I-间位碘代苄胍(MIBG) SPECT显像间的关系,探讨18F-FDG PET/CT在诊断嗜铬细胞瘤和预测嗜铬细胞瘤恶性程度中的价值.方法 采用回顾性研究方法,收集经18F-FDG PET/CT检查且手术病理证实为嗜铬细胞瘤的患者19例,按其生物学行为分为良性组(n=11)与恶性组(n=8),查询PET/CT检查前后血MN、NMN及131 I-MIBG SPECT的检查结果,利用SPSS 17.0软件行两独立样本t检验,并绘制ROC曲线,探讨嗜铬细胞瘤SUVmax的特点,比较分析各检查之间的关系.结果 (1)11例良性嗜铬细胞瘤(BPCC)与8例恶性嗜铬细胞瘤(MPCC)PET/CT显像均为阳性;MPCC的SUVmax(19.40±7.39)明显大于BPCC的SUVmax (7.44±4.47),t=-4.40,P＜0.01;用约登指数法,确定SUVmax=8.85为判断嗜铬细胞瘤良恶性的分界值,其灵敏度、特异性和准确性分别为8/8、81.8％(9/11)、89.5％ (17/19);异位嗜铬细胞瘤SUVmax为19.75±8.64,明显高于肾上腺嗜铬细胞瘤SUVmax (9.12±5.83),t=-3.18,P＜0.05;初发与复发的嗜铬细胞瘤SUVmax间差异无统计学意义(t=-1.68,P＞0.05).(2)MN阴性病例SUVmax( 13.57±8.61)明显高于MN阳性病例SUVmax (6.63±2.42),t =2.70,P＜0.05;NMN阴性与阳性的病例SUVmax间差异无统计学意义(t=-0.93,P＞0.05).(3)7例同期行18F-FDG PET/CT与131I-MIBG SPECT患者中,3例BPCC,其中2例MIBG显像阳性,4例MPCC MIBG显像均为阴性;7例PET/CT显像均为阳性.结论 对于血MN与MIBG检查为阴性、但临床疑为嗜铬细胞瘤患者,FDG PET/CT可作为辅助诊断手段,减少漏诊率.     

孤立性肺病变18F-FDG PET/CT显像诊断价值及误诊原因分析

目的 探讨18F-FDG PET/CT显像对孤立性肺病变的诊断价值及误诊原因.方法 回顾分析32例孤立性肺部病变患者18F-FDG PET/CT显像结果.将PET/CT结果与病理检查结果进行对比,评价18F-FDG PET/CT显像在孤立性肺部病变诊断中的价值,并分析其误诊原因.应用SPSS 16.0软件行统计学分析,SUVmax及SUVmax变化率(△SUVmax)与病灶直径大小关系采用Pearson相关分析.结果 32例孤立性肺部病变中,恶性病变22例,良性病变10例.18F-FDG PET/CT对68.75％( 22/32)患者进行了准确定性诊断.18F-FDG PET/CT显像假阴性5例,假阳性5例.22例肺部恶性病变中,6例恶性病变早期SUVmax ＜2.5,5例恶性病变△SUVmax＜15％.10例肺部良性病变中,2例良性病变早期SUVmax≥2.5,4例良性病变△SUVmax≥15％.良恶性病变SUVmax及△SUVmax有交叉.32例肺部病变中,孤立性肺部病变最大直径≤3 cm共26例,最大直径＞3 cm共6例,平均(1.98±1.08) cm.SUV max与病变直径大小呈正相关(r=0.690,P＜0.01),△SUVmax与病灶直径大小无相关性(r=-0.081,P＞0.05).结论 18F-FDG PET/CT在肺部孤立性病变定性诊断中有重要临床价值,但单纯依靠SUV max存在不足,应将PET与CT综合分析.