骨关节炎动物模型中^99Tc^m-枸橼酸的生物分布特征及其代谢研究

目的：利用骨关节炎动物模型观察^99Tc^m-枸橼酸的生物分布和在骨关节炎症区域的代谢特点。方法：在制作骨关节炎动物模型的基础上，经在体显像及其感兴趣区技术计算器官和炎症关节的放射性活度的变化，同时也利用动物模型离体的测量器官或组织的百分注射量，分析^99Tc^m-枸橼酸在各器官和骨关节炎症区域的代谢特点。结果：^99Tc^m-枸橼酸的蛋白结合率为(17．01&;#177;0．75)％，骨关节炎症区域对^99Tc^m-枸橼酸有较高的摄取，骨关节炎的患／健比值出现在注射示踪剂后的30min到1h之间：在体显像患／健比值分别为4．120&;#177;0．552和3．150&;#177;0．587；百分注射量靶／非靶比值分别为3．279&;#177;0．463和3．899&;#177;0．125。^99Tc^m-枸橼酸主要经泌尿系统捧出。但也有少量是经肝脏一肠道系统捧出。结论：^99Tc^m-枸橼酸有较低的蛋白结合率，是急性骨关节炎良好的显像剂，其最佳显像时间为注射^99Tc^m-枸橼酸后的1h。     

99Tcm-HL91与99Tcm-MIBI在S180恶性纤维肉瘤小鼠模型中的对比研究

目的:对比研究乏氧显像剂99Tcm-HL91和肿瘤阳性显像剂99Tcm-MIBI诊断S180恶性纤维肉瘤的可能性。方法:11只S180恶性纤维肉瘤小鼠模型经尾静脉注射99Tcm-HL91后,取其中5只,分别于注射后1/6、1、2、4和6小时行全身平面显像,利用感兴趣区(ROI)技术,计算不同时相的肿瘤/健侧肌肉、头部、胸部、腹部的放射性比值。另6只随机分为两组,分别于注射后1小时和6小时处死,取血、肌肉、肿瘤,称重并测量放射性,计算单位重量的肿瘤/血(T/B)、肿瘤/肌肉(T/NT)放射性比值。再取5只S180小鼠经尾静脉注射99Tcm-MIBI,于注射后1/6小时和2小时行全身平面显像,用ROI技术计算肿瘤/健侧肌肉放射性比值。结果:99Tcm-HL91显像组1~6小时肿瘤部位均显示清晰,肿瘤/健侧肌肉的放射性比值随时间延长而增加,6小时时与1小时相比差异显著(P<0.01)。肿瘤与头部、胸部也有较高的对比度。99Tcm-HL91解剖组1小时时T/NT、T/B分别为1.501±0.467和1.256±0.308,6小时时T/NT、T/B分别为6.377±1.296和3.633±1.140,两组差异均显著。99Tcm-MIBI显像组的肿瘤部位显示不清晰,1/6小时和2小时的肿瘤/健侧肌肉的放射性比值无差异(P>0.05)。99Tcm-MIBI显像2小时时的肿瘤/肌肉放射性比值与同期99Tcm-HL91显像组比较,差异显著(P<0.01)。结论:99Tcm-HL91可用于软组织恶性肿瘤乏氧显像诊断,比99Tcm-MIBI具有更高的显像灵敏度。     

乳腺肿块99Tcm-MIBI双时相断层显像与X线钼靶对照研究

目的：分析比较99Tcm-甲氧基异丁基异腈（MIBI）双时相断层显像与钼靶X线摄影法对乳腺肿块的临床诊断价值。方法：对93例女性乳腺肿块患者术前1周行99Tcm-MIBI双时相断层和X线钼靶摄影检查，以术后病理结果为金标准，判断以上2种方法在乳腺癌早期诊断中的灵敏性、特异性、准确性、阳性预测值及阴性预测值。结果：①99Tcm-MIBI乳腺双时相断层显像示：良性病变早期和延迟相T/NT比值为2.08±2.85和1.69±3.05，两者有显著性差异（P<0.05）；乳腺癌早期和延迟相T/NT比值为5.00±4.34和6.79±11.94，两者无显著性差异（P>0.05）。②99Tcm-MIBI乳腺肿块双时相断层显像诊断乳腺癌的敏感性为97.1%，特异性为94.8%，准确性为95.7%，阳性预测值为91.9%，阴性预测值为98.2%；X线钼靶诊断乳腺癌的敏感性为82.9%，特异性为70.7%，准确性为75.3%，阳性预测值为63.0%，阴性预测值为87.2%；2种方法对乳腺癌的诊断效能有显著性差异（P<0.05）。结论：99Tcm-MIBI双时相断层显像对乳腺癌的诊断效能优于X线钼靶摄影法。99Tcm-MIBI乳腺双时相断层显像是一种高灵敏性和特异性的乳腺癌检查方法，对鉴别乳腺良恶性病变有较高的临床价值。     

99mTcN(NOEt)2与99mTc-MIBI在肿瘤模型显像中的对比研究

目的:探讨99mTcN(NOEt)2 应用于肿瘤诊断的可能性并与99mTc-MIBI进行比较。方法:各取4只移植性艾氏腹水癌小鼠分别注射99mTc-MIBI或99mTcN(NOEt)2,30min,2h,4h后进行静态显像。利用感兴趣区技术,计算不同时相肿瘤与头部、胸部及健侧肢体对称部位(T/L)的放射性比值。4h后处死99mTcN(NOEt)2显像组小鼠,取血并剥离脏器及肿瘤组织,测量放射性计数,计算肿瘤与各脏器放射性比值。结果:99mTcN(NOEt)2选择性地有效的聚集于肿瘤组织。除腹部外其它组织靶/非靶比值较高,注射2h 后T/L比值达最高,为4.87。99mTcN(NOEt)2显像组与99mTc-MIBI显像组比较,T/L比值差异有显著性(P<0.01)。体外测量肿瘤与血、肌肉、肺等脏器靶/非靶比值较高,与肝、小肠等腹部脏器靶/非靶比值较低。结论:在移植性艾氏腹水癌小鼠模型中99mTcN(NOEt)2靶与非靶比值高,可能是一种较99mTc-MIBI更好的肿瘤阳性显像剂。     

乳腺肿物~(99m)Tc-MIBI显像、钼靶X线诊断对照分析

目的 :分析比较99mTc -MIBI(甲氧基异丁基异腈)乳腺显像与钼靶X线摄影法对乳腺肿块的临床诊断价值。方法 :40例单侧乳腺肿块患者 ,包括良性病变29例 ,恶性病变11例 ,在1周内同时接受99mTc -MIBI乳腺显像和钼靶X线摄影检查。钼靶X线片结合放大镜观察钙化点的情况分析 ,99mTc -MIBI显像取感兴趣区(ROI) ,求出肿块与正常组织中放射性比值(T/NT)。结果 :99mTc-MIBI显像T/NT放射性比值 ,恶性为1 98±0 22(n=12) ;良性为1 16±0 10(n=28) ;两者有显著性差异(P<0 01)。99mTc-MIBI显像与钼靶X线摄影法诊断乳腺癌的灵敏度和特异性分别为83 3%、92 8%和90 9 %、24 1%。结论 :钼靶X线摄影发现乳腺恶性病变敏感性高而特异性低 ;99mTc-MIBI显像对乳腺肿块诊断特异性和准确性明显优于钼靶X线摄影 ,两种影像方法各有所长 ,如果结合应用 ,可提高诊断的准确性     

99mTc标记炎症相关多肽进行炎症显像的实验研究

目的:为了说明炎症相关小分子肽作为炎症显像剂的优越性,以获得一种有效的和有发展潜力的炎症显像剂。方法:应用核素99mTc标记抗体(IgG)和小分子炎症相关肽(peptide related to inflammation,PRI)在大鼠炎症模型的体内生物分布和兔炎症模型显像的比较研究。结果:在大鼠体内的生物分布表明99mTc-PRI的靶/肌肉和靶/血液比值高于99mTc-IgG,在肝脾聚集比99mTc-IgG少。血液清除快,肠腔聚集少。在兔炎症模型显像研究表明,99mTc-PRI的靶/非靶比值高于99mTc-IgG,而且30~60min就能使炎症病灶显像,1小时能使炎症灶清晰显像。结论:目前,小分子肽类的炎症显像剂是一种有发展潜力的显像剂,而且具有广阔的发展和临床应用前景。     

肺癌^18F—FDG和^99mTc—MIBI显像研究

目的探讨18F-FDG和99mTc-MIBI两种显像方法对肺癌诊断价值.方法患者禁食4小时以上,静脉注入37MBq18F-FDG,静卧45分钟后进行FDG显像.MIBI显像方法是早餐吃油煎鸡蛋喝牛奶,静脉注入1.11GBq 99mTc-MIBI,之后60分钟进行胸部断层显像检查,32例肺癌患者加作120分钟延迟显像.结果41例FDG显像的阳性率是92.7%(38/41),靶本比2.90±1.35.41例MIBI60分钟显像的阳性率是75.6%(31/41),靶本比1.92±0.59;32例延迟显像的阳性率为78.1%(25/32),靶本比1.78±0.53.FDG的靶本比和阳性率高于MIBI(P＜0.05),鳞癌和腺癌FDG显像的靶本比无差异(P＞0.05).结论FDG的显像质量和阳性率均优于MIBI,MIBI阴性显像结果是否与多药耐药有关有待进一步研究.     

99Tcm-HL91乏氧显像在非小细胞肺癌放疗中的初步临床应用研究

目的 通过研究非小细胞肺癌三维适形放疗前后乏氧显像结果与放疗疗效的关系,探讨利用99Tcm-HL91乏氧显像来检测肿瘤乏氧及预测和评价放疗疗效的临床价值.方法 拟接受三维适形放疗的10例非小细胞肺癌患者,在放疗前1～2 天和结束后1～2天各进行一次99Tcm-HL91显像.应用感兴趣区(ROI)技术测定肿瘤/对侧相应部位放射性计数比值(T/N),分析放疗前T/N比值和放疗前后T/N比值的变化与疗效的关系.结果 放疗有效组(CR+PR)与无效组(NC+PD)的放疗前3 h断层显像T/N比值分别为1.90±0.16和2.20±0.21(P=0.040),两组3 h断层显像T/N比值下降率分别为(21.63±5.83)%和(11.40±5.16)%(P=0.031).结论 可利用放疗前99Tcm-HL91断层显像和放疗前后乏氧显像的改变来预测和评价非小细胞肺癌三维适形放疗疗效.     

99Tcm-TRODAT-1 SPECT脑显像对早期帕金森病患者纹状体及多巴胺转运蛋白功能变化的评估价值

目的探讨99Tcm-TRODAT-1 SPECT脑显像在早期帕金森病(Parkinson disease,PD)评估中的价值,为实施有效的神经保护治疗提供理论依据.方法对10例早期PD患者(Hoehn-YahrⅠ级)和10例年龄匹配正常对照者分别进行99Tcm-TRODAT-1 SPECT脑显像,应用计算机感兴趣技术分别计算早期PD患者和正常对照者双侧纹状体/小脑的放射性计数比值,并对结果进行比较分析.结果早期PD患者的患侧肢体对侧纹状体/小脑的放射性计数比值(1.53±0.09)较正常对照者(双侧均值为1.74±0.05)明显降低,差异有显著性意义(t=6.802,P=0.000),较同侧(1.67±0.07)也有降低,差异有显著性意义(t=4.035,P=0.000 8),并且患侧肢体同侧纹状体/小脑的放射性计数比值较正常对照者也有降低,差异有显著性意义(t=2.896,P=0.0096).结论早期PD患者患侧肢体对侧纹状体DAT的功能明显降低,同侧纹状体的功能也有降低,99Tcm-TRODAT-1 SPECT脑显像有助于PD的早期诊断.     

应用重组改良型人膜联蛋白评估兔动脉粥样硬化病变程度的实验研究

目的：探讨99mTc标记的重组改良型人膜联蛋白（H-Annexin V）评估兔动脉粥样硬化病变程度的价值。方法：9只雄性大耳白兔随机分为球囊损伤组、单纯高脂饲料组、正常对照组,每组3只。球囊损伤组兔通过球囊损伤腹主动脉内膜,并饲喂高脂饲料15周。单纯高脂饲料组兔饲喂高脂饲料15周。对照组兔给予普通饲料喂养15周。15周后3组大白兔均自耳缘静脉注射99mTc-H-Annexin V 37~55.5MBq/kg,进行活体及离体血管显像。对球囊损伤组和高脂饲料组兔降主动脉分段,测定各段质量和放射性计数,并进行病理学检查。结果：显像剂注射后2小时,球囊损伤组兔降主动脉显影最为清晰。单纯高脂饲料组兔仍可见降主动脉影像。对照组兔降主动脉显影不明显。注射显像剂后2小时球囊损伤组靶/非靶（T/NT）比值（2.68±0.25）明显高于单纯高脂饲料组（2.08±0.18,t=3.26,P＜0.05）和正常对照组（1.57±0.24,t=5.44,P＜0.01）。离体显像可见：球囊损伤组影像较为清晰,而单纯高脂饲料组可见降主动脉显影,但影像欠清晰。球囊损伤组含AS斑块的血管片段放射性摄取为63.33±14.11cpm/mg,明显高于单纯高脂饲料组含AS斑块血管片段的放射性摄取52.08±12.39cpm/mg（t=2.17,P＜0.05）。结论：99mTc-H-Annexin V核素显像在评估兔动脉粥样硬化病变程度方面具有重要的临床价值。     

MIBI及MDP显像在骨单发病灶诊断中价值

目的探讨99mTc-MIBI显像在骨单发病灶鉴别诊断中价值并与99mTc-MDP骨显像进行比较。方法对105例骨单发病灶患者(恶性肿瘤70例,良性病变35例)均进行99mTc-MDP并SPECT/CT融合及99mTc-MIBI检查,用ROC曲线评价99mTc-MDP平面并融合显像及99mTc-MIBI显像对骨单发病灶的诊断效能。结果 99mTc-MDP及99mTc-MIBI显像灵敏度分别为94.29%和87.14%(P<0.05),特异度分别为80.00%和82.86%(P<0.05);99mTc-MDP骨显像中良、恶性病灶的T/N(放射性计数比)值差异无统计学意义(P>0.05);99mTc-MIBI早、晚期显像中T/N值恶性病灶分别为(2.45±0.79)和(2.96±0.89),均明显高于良性病灶(1.30±0.34)和(1.39±0.38)(P均<0.05);AUC依次为99mTc-MIBI晚期>99mTc-MIBI早期>99mTc-MIBI滞留指数>99mTc-MDP。结论 99mTc-MIBI显像较99mTc-MDP平面并融合显像灵敏度低、特异性高,对骨单发病灶有较好诊断效能。     

Design considerations for incorporating sodium iodide symporter reporter gene imaging into prostate cancer gene therapy trials

This study was done to aid in the design of a phase I gene therapy trial in patients with prostate cancer. We determined the dosimetric characteristics of our reporter gene system when coupled with intravenous administration of radioactive sodium pertechnetate (Na(99m) TcO(4)) and determined the feasibility of using human sodium iodide symporter (hNIS) as a reporter gene to study the dynamics of adenoviral transgene expression in a large animal tumor. A replication-competent Ad5-yCD/mutTK(SR39) rep-hNIS adenovirus was injected into the prostate gland of dogs for dosimetry purposes, and into a canine soft tissue sarcoma (STS) for imaging purposes. After resection of the prostate, the amount of (99m)TcO(4)() sequestered in the prostate was determined, the radiation dose absorbed by the prostate and nontarget critical organs was calculated, and hNIS reporter gene expression was imaged in the STS by single-photon emission computed tomography (SPECT). On the basis of the findings from 25 dogs, the amount of (99m)TcO (4)() sequestered in the prostate ranged from 13 to 276 muCi. Using the highest value observed, absorbed radiation dose to critical organs was calculated and found to be below U.S. Food and Drug Administration limits for diagnostic imaging. Also, (99m)TcO (4)() uptake was readily detected by SPECT and found to persist in vivo for at least 4 days. On the basis of our dosimetry calculations, up to five imaging procedures can be safely performed in humans after intraprostatic injection of the Ad5-yCD/mutTK(SR39)rep-hNIS adenovirus and the hNIS reporter gene system can be used to study the dynamics of adenoviral gene therapy vectors in large animal tumors.     

Tc-99m tetrofosmin myocardial distribution 4 hours post injection

The recommended protocol for Tc99m tetrofosmin myocardial imaging suggests either a one- or two day imaging protocol so that stress and rest studies are sufficiently separated in time to allow optimum myocardium to background uptake ratios to differentiate between myocardial ischaemia and/or infarction. The biokinetic data for tetrofosmin suggest that no significant changes occur in myocardial distribution up to 180 minutes post injection. It is, therefore, necessary for two doses of the radiopharmaceutical and two separate studies to evaluate the myocardial status during stress and rest. This study assessed the differences between the 1 and 4 hour post injection SPET images obtained following peak exercise in 20 consecutively chosen patients. In addition, these images were compared to the rest images obtained on the following day after a second dose of the radiopharmaceutical was administered. In 4 patients, a one and four hour post injection study was also done during the rest phase. The results demonstrate significant changes in Tc-99m tetrofosmin distribution between the one hour and four hour post injection images. These differences are present during the stress as well as rest studies.     

早期帕金森病患者99Tcm-TRODAT-1多巴胺转运蛋白显像研究

目的 研究早期帕金森病（parkinson disease,PD）患者99Tcm—TRODAT—1多巴胺转运蛋白SPECT显像的特点和诊断价值。方法 15例早期PD患者和10例对照者,分别进行99Tcm—TRODAT—1多巴胺转运蛋白（dopamine transporter,DAT）显像,观察其放射性分布特点,并利用半定量分析法,分别计算纹状体（striatum,ST）、尾状核（caudate nucleus,CN）及壳核（putamen,PT）与小脑（cerebellum,CB）的放射性计数比值。比较对照组和早期PD患者两侧纹状体及主要区域DAT功能差异。结果 对照组ST／CB、PT／CB、CN／PD组对侧ST／CB、PT／CB、CN／CB分别为1.23±0．13、1.80±0．15、1．13±0.13;PD组同侧ST／CB、PT／CB、CN／CB分别为1．79±0．13、1．86±0．15、1．78±0.14。PD组对侧与对照组比较,其中ST／CB、PT／CB差异均有统计学意义（t=10．83、15．21,P均〈0.05）;而CN／CB差异无统计学意义（t=1.96,P〉0．05）。PD组对侧与PD组同侧比较,其中ST／CB、PT／CB差异均有统计学意义（t=10.55、11．69,P均〈0.05）;而CN／CB差异无统计学意义（t=1．08,P〉0．05）。结论 早期PD患者存在着惠肢对侧ST、PT区的DAT放射性摄取值的下降,因此99Tcm—TRODAT—1多巴胺转运蛋白SPECT显像可作为PD早期诊断的客观诊断指标之一。     

脑梗死缺血组织显像的实验研究

目的探索99Tcm-4,9-二氮-3,3,10,10-四甲基十二烷-2,11-二酮肟(HL91)在局部脑缺血模型脑组织中分布特点以及99Tcm-HL91检测急性脑卒中缺血半暗带的可能性.方法45只SD大鼠,其中有14只用于研究99Tcm-HL91在正常大鼠体内的生物分布情况,有15只用于研究99Tcm-HL91在局部脑缺血模型的脑组织中分布特点,有16只动物模型进行了脑组织放射性自显影研究.结果肝脏和肾脏的99Tcm-HL91摄取比其他组织高,注射后1 h,小肠的摄取也比较高,但脑组织中的放射性较低.缺血部位(靶区)的放射性摄取较对侧相应部位高,手术各亚组和假手术各亚组间的差异具有统计学意义(t=2.9～23.11,P＜0.05～0.001).动物模型脑组织自显影图像可见靶区有局限性的99'Tcm-HL91选择性摄取,经计算机图像分析系统进行图像分析和统计学处理后,同一时相靶区与非靶区的单位面积净吸光度差异有显著性(t=4.423～12.277,P＜0.05),各时相靶/非靶比值与对照比较差异均有显著性(t=3.73～12.39,P＜0.01),且随着注射药物的时间延长而增高.结论99Tcm-HL91能够选择性地浓集于缺血缺氧的脑组织中,清除延缓,可用于急性脑卒中缺血半暗带的探测.     

Non-invasive gamma camera imaging of gene transfer using an adenoviral vector encoding an epitope-tagged receptor as a reporter

A model epitope-tagged receptor was constructed by fusing the hemagglutinin (HA) sequence on the extracellular N-terminus of the human somatostatin receptor subtype 2 (hSSTr2) gene. This construct was placed in an adenoviral (Ad-HAhSSTr2) vector. This study evaluated Ad-HAhSSTr2 in vitro and in vivo using FACS, fluorescent microscopy, radioactive binding assays, and gamma camera imaging techniques. Infection of A-427 non-small cell lung cancer cells with Ad-HAhSSTr2 or Ad-hSSTr2 resulted in similar expression of hSSTr2 by FACS analysis and binding assays using a (99m)Tc-labeled somatostatin analogue ((99m)Tc-P2045). HAhSSTr2 expression in A-427 cells was specific for infection with Ad-HAhSSTr2. FITC-labeled anti-HA antibody (FITC-HA) confirmed surface expression in live A-427 cells and the absence of internalization. Gamma camera imaging and gamma counter analysis of normal mice showed significantly greater (P<0.05) liver uptake of (99m)Tc-labeled anti-HA antibody ((99m)Tc-anti-HA) in mice injected i.v. 48 h earlier with Ad-HAhSSTr2 (53.6+/-6.9% ID/g) as compared to mice similarly injected with Ad-hSSTr2 (9.0+/-1.3% ID/g). In a mouse tumor model, imaging detected increased tumor localization of (99m)Tc-anti-HA due to direct intratumor injection Ad-HAhSSTr2. Gamma counter analysis confirmed significantly greater (P<0.05) uptake of (99m)Tc-anti-HA in tumors injected with Ad-HAhSSTr2 (12.5+/-4.1% ID/g) as compared to Ad-hSSTr2-infected tumors (5.1+/-1.5% ID/g). These studies demonstrate the feasibility of using an epitope-tagged reporter receptor for non-invasively imaging gene transfer.     

氧介入99mTc-MIBI SPECT/CT同机融合鉴别诊断孤立性肺结节

目的探讨氧介入99mTc-MIBI SPECT/CT同机融合鉴别诊断孤立性肺结节(SPN)的价值。方法收集34例SPN患者,令其于注射99mTc-MIBI前吸氧。分别于注射99mTc-MIBI后10min、2h进行早期和延迟SPECT/CT断层同机融合显像,分析良、恶性SPN早期摄取比值(EUR)和延迟摄取比值(DUR),并对其诊断效率进行ROC曲线分析。结果 34例SPN患者中,10例为原发性肺癌;24例良性肺部病变。氧介入99mTc-MIBI SPECT/CT同机融合显像定性分析鉴别诊断良、恶性SPN的敏感度为90.00%(9/10),特异度为87.50%(21/24),准确率为88.24%(30/34),阳性预测值为75.00%(9/12),阴性预测值为95.45%(21/22)。恶性SPN的EUR为2.13±0.62(95%CI 1.68～2.57),良性SPN为1.31±0.42(95%CI 1.13～1.48);恶性SPN的DUR为2.40±0.47(95%CI 2.07～2.74),良性SPN为1.37±0.64(95%CI 1.09～1.64)。恶性肺部病灶EUR和DUR均显著高于良性肺部病灶(t=4.53、4.59,P均<0.001)。半定量ROC分析显示,以EUR≥1.50为界值,敏感度90.00%,特异度79.20%;以DUR≥1.47为界值,敏感度100%,特异度79.20%。结论氧介入99mTc-MIBI SPECT/CT同机融合显像对鉴别良、恶性SPN具有较高的临床价值。     

(99m)Tc-albumin can replace (125)I-albumin to determine plasma volume repeatedly

Abstract Objective. Plasma volume assessment may be of importance in several disorders. The purpose of the present study was to compare the reliability of plasma volume measurements by technetium-labeled human serum albumin ((99m)Tc-HSA) with a simultaneously performed plasma volume determination with iodine-labeled human serum albumin ((125)I-HSA). Materials and methods. In 15 healthy volunteers, simultaneous plasma volume measurements with (99m)Tc-HSA and (125)I-HSA were performed after ? hour in the supine position. Blood samples were obtained 10, 15, 20, and 30 minutes after the injection for accurate retropolation from the plasma counts to time zero to correct for leakage of the isotopes from the circulation. Results. The mean difference (bias) between plasma volume measured with (125)I-albumin and (99m)Tc-albumin was 8 ml (0.1 ml/kg) with limits of agreement (bias ±1.96 SD) ranging from -181-196 ml (-2.3-2.5 ml/kg). The tracer disappearance rate was significantly higher with (99m)Tc-albumin (-23.1±7.1%/h) than with (125)I-albumin (-6.7±3.6%/h) (p <0.001). Conclusion. This study demonstrates that (99m)Tc-HSA can replace (125)I-HSA for single measurements of plasma volume in healthy volunteers. It needs to be emphasized however, that repeated blood sampling for 1/2 hour after injection of the tracer is required to correct for the disappearance of (99m)Tc and (99m)Tc-HSA from the circulation.     

强直性脊柱炎患者放射性核素骨显像分析

目的　研究放射性核素骨显像对强直性脊柱炎 (AS)的诊断价值。方法　AS患者和对照组均做了全身、局部及断层骨显像 ,并测定了骶髂关节 /骶骨 (SI/S)的计数比值。结果　早期AS患者的SI/S比值 (1.5 3± 0 .11)与对照组 (1.2 1±0 .10 )、中期 (1.2 8± 0 .2 9)和晚期 (1.19± 0 .3 9)AS患者比较 ,均有显著性差异 (P <0 .0 1) ;中期和晚期AS患者的SI/S比值之间 ,以及中、晚期AS患者的SI/S比值与对照组比较 ,均无差异 (P >0 .0 5 )。 6例X线平片无异常的AS患者全身骨显像则发现腰椎及外周关节放射性异常浓聚 ;AS患者全身骨显像共发现椎骨异常浓聚灶 2 43个 ,而断层显像则检出 3 0 9个异常浓聚灶。结论　放射性核素骨显像测定SI/S比值对AS早期诊断有重要价值 ;对中、晚期AS的诊断意义不大 ;骨显像发现AS骨关节部位的早期病变比X线平片更敏感 ;断层显像对了解AS椎骨诸关节病变比平面显像具有明显的优势