鼻咽癌放射治疗后~(99m)Tc-MIBI SPECT显像的临床价值

目的:评价99mTc-MIBI SPECT显像对鼻咽癌患者放疗后局部残余或复发病灶的鉴别价值。方法:48例经病理证实的原发性鼻咽癌患者于放疗后3个月行99mTc-MIBI SPECT显像,与同期的CT结果对照,并分别计算鼻咽部与头皮的放射性计数比值作为99mTc-MIBI摄取指数(MUI)。以接受器工作特性曲线(ROC)分析确定MUI判别阈值。鼻咽内镜检查、病理活检及18个月的临床随访资料作为鼻咽癌病灶残余或鼻咽癌复发的依据。结果:以MUI≥1.33为阳性标准,99mTc-MIBI SPECT显像监测鼻咽癌病灶残余或复发的敏感度73.33%,特异度93.94%,诊断符合率87.50%。CT监测鼻咽癌病灶残余或复发的敏感度73.33%,特异度84.85%,诊断符合率81.25%。99mTc-MIBI SPECT显像与CT联合鉴别鼻咽癌病灶残余或复发的敏感度、特异度和诊断符合率分别为100%、96.55%和97.30%。结论:99mTc-MIBI SPECT显像对鼻咽癌患者放疗后局部残余或复发病灶的鉴别有一定价值;与CT联合可有效提高对放疗后鼻咽癌病灶残余或复发的早期诊断效能。     

鼻咽癌放射治疗后99mTc-MIBI SPECT显像的临床价值

目的：评价^99mTc—MIBISPECT显像对鼻咽癌患者放疗后局部残余或复发病灶的鉴别价值。方法：48例经病理证实的原发性鼻咽癌患者于放疗后3个月行^99mTc—MIBISPECT显像,与同期的CT结果对照．并分别计算鼻咽部与头皮的放射性计数比值作为^99mTc—MIBI摄取指数（MUI）。以接受器工作特性曲线（ROC）分析确定MUI判别阈值。鼻咽内镜检查、病理活检及18个月的临床随访资料作为鼻咽癌病灶残余或鼻咽癌复发的依据。结果：以MUI≥1．33为阳性标准．^99mTc—MIBISPECT显像监测鼻咽癌病灶残余或复发的敏感度73．33％,特异度93．94％,诊断符合率87．50％。CT监测鼻咽癌病灶残余或复发的敏感度73．33％,特异度84．85％,诊断符合率81．25％。^99mTc—MIBISPECT显像与CT联合鉴别鼻咽癌病灶残余或复发的敏感度、特异度和诊断符合率分别为100%、96．55％和97．30％。结论：^99mTc—MIBISPECT显像对鼻咽癌患者放疗后局部残余或复发病灶的鉴别有一定价值;与CT联合可有效提高对放疗后鼻咽癌病灶残余或复发的早期诊断效能。     

CT与MRI对鼻咽癌放疗后局部复发或残留的诊断

目的探讨CT与MPI对鼻咽癌放疗后局部复发或残留的诊断价值。方法收集125例放疗后4月～2年CT和／或MRI检查出现异常块影的鼻咽癌患。73例行鼻咽部活检,活检阴性及未活检患继续行CT或MRI随访。将CT、MRI结果与病理对比。结果病理活检或CT、MRI随访复查证实55例(55／125,44．4％)为放疗后局部复发或残留,70例(70／125,55．6％)为放疗后改变。CT诊断鼻咽癌放疗后局部复发或残留的敏感性、特异性、准确性分别为54．8％、73．8％、65．8％;MRI诊断的敏感性、特异性、准确性分别为61.8％、83．7％、74．0％。结论CT和MRI诊断鼻咽癌放疗后局部复发或残留的准确性相对均较低,MRI稍优于CT。     

鼻咽癌PET/CT影像表现及临床价值

目的研究鼻咽癌及其颈部淋巴结转移的PET／CT影像表现。方法初诊鼻咽癌患者51例、鼻咽部炎症患者14例及鼻咽癌治疗后患者36例。皆行^18F-脱氧葡萄糖（FDG）PET／CT显像。鼻咽部炎症患者和鼻咽癌治疗后患者临床随访时间皆〉6个月，淋巴结随访时间6～14个月。结果①51例鼻咽癌初诊患者和14例鼻咽部炎症患者的PET和CT影像表现差异明显。以鼻咽部软组织肿块（或组织增厚）处PET呈结节状、块状代谢增高为鼻咽癌PET／CT诊断标准，则灵敏度为96．0％，特异性为85．7％。PET／CT在鼻咽癌病灶的定位、病灶边界的确定及显示病灶对周围组织的侵犯方面优于PET和CT。②36例鼻咽癌治疗后患者，以鼻咽部软组织肿块（或组织增厚）处PET呈结节状或块状代谢增高为PET／CT诊断鼻咽癌复发、残余的标准，而以鼻咽部组织增厚作为CT诊断鼻咽癌复发、残余的标准，则PET／CT和CT对复发、残余病灶的检出灵敏度分别为84．6％和92．3％．特异性分别为91．3％和56．5％，假阳性率分别为8．6％和43．4％。③87例鼻咽癌患者中，6l例有颈部淋巴结增大，PET／CT和MRI诊断淋巴结转移的灵敏度分别为91．8％和88．8％（P〉0．05），特异性分别为82．2％和51．1％（P〈0．05）。结论PET／CT显像在诊断鼻咽癌及其淋巴结转移和复发方面优于单纯PET和CT。     

^99Tc^m-HL91乏氧显像在恶性肿瘤治疗后随访中的应用

目的评价^99Tc^m-4,9-二氮-3,3,10,10-四甲基十二烷-2,11-二酮肟（HL91）乏氧显像在恶性肿瘤治疗后随访中的价值。方法37例胸部和头颈部恶性肿瘤患者在治疗结束后3—12个月的临床随访中,CT检查怀疑肿瘤残余、复发或转移,再行^99Tc^m-HL91乏氧显像。目测定性分析,判定乏氧显像阳性病例,再用感兴趣区（ROI）技术对阳性病例进行半定量分析,计算肿瘤部位（T）与对侧相应部位或头皮（NT）的放射性比值（T／NT）,并采用成组设计两样本均数t检验进行比较。以鼻咽内镜检查、病理活组织检查结果和12个月的临床随访资料作为判断肿瘤残余、复发或转移的依据,计算^99Tc^m-HL91显像和cT的诊断效能。结果37例患者中,无肿瘤局部残余或复发病灶者19例,存在肿瘤局部残余或复发病灶者11例,有远处转移病灶者7例。（1）无肿瘤局部残余或复发组与肿瘤局部残余或复发组的T／NT比值分别为1．18±0．14和1．58±0．16,两者差异有统计学意义（t=4．87,P〈0．001）。（2）^99Tc^m-HL91显像监测肿瘤局部残余或复发的灵敏度72．73％（8／11）,特异性89．47％（17／19）,准确性83．33％（25／30）;CT监测肿瘤局部残余或复发的灵敏度63．64％（7／11）,特异性84．21％（16／19）,准确性76．67％（23／30）。^99Tc^m-HL91显像与CT结果一致的有21例患者,^99Tc^m-HL91显像与CT联合监测此21例肿瘤残余或复发的灵敏度4／4,特异性94．12％（16／17）,准确性95．24％（20／21）。（3）7例转移患者,^99Tc^m-HL91显像阳性4例,CT均阳性。结论^99Tc^m-HL91乏氧显像对恶性肿瘤治疗后局部残余、复发或转移灶的鉴别有一定价值,与CT联合可有效提高对恶性肿瘤治疗后局部残余、复发或转移灶的早期诊断效能。     

^99Tc^m—MIBI双时相显像定位诊断继发性甲状旁腺功能亢进症的价值

目的探讨^99Tc^m-MIBI双时相显像在定位诊断继发性甲状旁腺功能亢进症（SHPT）中的临床价值。方法回顾性分析2010年至2013年间20例（男8例,女12例,平均年龄49．6岁）行甲状旁腺切除术的肾性SHPT患者影像学资料,以术后病理结果为“金标准”,计算^99Tc^m-MIBI双时相SPECT／CT显像结果与彩色多普勒超声（CDUS）对SHPT的诊断效能,同时对延迟显像中甲状旁腺摄取的最高放射性比值（T／NT）与患者近期全段PTH（iPTH）水平及术中切除的相应甲状旁腺体积的关系作分析。采用x^2检验、Pearson相关或Spearson相关分析数据。结果^99Tc^m-MIBI双时相显像和CDUS诊断SHPT的灵敏度、特异性、阳性预测值、阴性预测值、准确性分别为66．67％（44／66）、100％（14／14）、100％（44／44）、38．89％（14／36）、72．50％（58／80）和78．19％（43／55）、52．38％（11／21）、81．13％（43／53）、47．83％（11／23）、71．05％（54／76）。二者诊断SHPT的特异性和阳性预测值差异有统计学意义（x^2=9．33和9．26,均P〈0．05）,其余3个指标差异均无统计学意义（x^2=1．97、0．04和0．46,均P〉0．05）。最高T／NT与患者iPTH水平及手术切除的相应甲状旁腺体积均呈正相关（r=0．638,rs=0．571,均P〈0．05）。结论^99Tc^m-MIBISPECT／CT显像诊断SHPT的特异性高于CDUS0^99Tc^m-MIBI双时相显像可准确定位功能亢进的甲状旁腺,为手术治疗提供依据。     

CT与MRI对鼻咽癌放疗后局部复发或残留的诊断

目的 探讨CT与MRI对鼻咽癌放疗后局部复发或残留的诊断价值。方法 收集125例放疗后4月～2年CT和/或MRI检查出现异常块影的鼻咽癌患者。73例行鼻咽部活检,活检阴性及未活检患者继续行CT或MRI随访。将CT、MRI结果与病理对比。结果 病理活检或CT、MRI随访复查证实55例(55/125,44.4％)为放疗后局部复发或残留,70例(70/125,55.6％)为放疗后改变。CT诊断鼻咽癌放疗后局部复发或残留的敏感性、特异性、准确性分别为54.8％、73.8％、65.8％;MRI诊断的敏感性、特异性、准确性分别为61.8％、83.7％、74.0％。结论 CT和MRI诊断鼻咽癌放疗后局部复发或残留的准确性相对均较低,MRI稍优于CT。     

乳腺癌及腋淋巴结转移^99Tc^m—tetrofosmin与^99Tc^m—MIBI显像的对比研究

目的 研究^99Tc^m-tetrofosmin和^99Tc^m-甲氧基异丁基异腈（MIBI）显像诊断乳腺癌和腋淋巴结转移的临床价值。方法 对52例乳腺肿瘤患者进行^99Tc^m-tetrofosmint和^99Tc^m-MIBI显像。患者均为2周内行外科手术治疗,并做病理检查。结果 26例患者病理检查证实为乳腺癌,其中30例为良性病变。^99Tc^m-tetrofosmin显像发现乳腺癌21例,其中11例合并腋淋巴结转移;^99Tc^m-MIBI显像发现乳腺癌19例,其中12例合并腋淋巴结转移。^99Tc^m-tetrofosmin和^99Tc^m-MIBI显像对乳腺癌诊断的灵敏度、特异性和准确性分别为80．8％、76．7％、78．6％和73．1％、73．3％、73．2％;诊断腋淋巴结转移的灵敏度、特异性和准确性分别为68．8％、80．0％、76．0％和75．0％、80．0％、76．9％。结论 ^99Tc^m-tetrofosmin显像对乳腺癌的检出优于^99Tc^m-MIBI显像。     

18F-FDG PET显像用于鼻咽癌诊断及分期

目的 探讨^18F-脱氧葡萄糖（FDG）PET显像在鼻咽癌诊断中的价值。方法 回顾性分析33例鼻咽癌患者的^18F-FDG PET显像效果。其中初诊患者4例，治疗后29例。行常规头颈部或全身^18F-FDG PET显像。结果 ①33例患者中，鼻咽部有恶性病灶（原发或复发病灶）者16例，PET灵敏度为100％，假阳性2例，特异性为88．3％，准确性为93．9％。与PET显像前的21例CT或MRI结果相比较，PET3检出鼻咽部恶性病灶10例，较CT或MRI多检出2例。②33例中22例有转移灶，PET检出20例（90．9％），较PET显像前的其他检查多检出5例；PET显像和PET显像前的其他检查皆有3例假阳性。在检出转移病灶数方面，PET显像多发现1处或多处转移灶有13例，PET显像少发现转移灶的2例。结论 ^18F-FDG PET显像灵敏、准确、全面，在鼻咽癌的诊断、早期复发灶及全身转移灶检出方面有重要价值。     

^99Tc^m—MIBISPECT结合定位CT显像诊断功能亢进异位甲状旁腺的价值

目的评价^99Tc^m-甲氧基异丁基异腈（MIBI）SPECT结合定位CT显像对功能亢进异位甲状旁腺的定位诊断价值。方法回顾性分析28例功能亢进异位甲状旁腺患者的手术、病理及影像资料。28例均行常规CT检查,其中25例先行双时相^99Tc^m-MIBI显像,对甲状腺外存在异常放射性浓聚灶患者,随即进行SPECT结合定位CT采集,经计算机处理得到二者融合图像,对放射性浓聚灶进行精确定位。以手术及病理检查结果为检查“金标准”,所有患者均按4个甲状旁腺计算,经手术及病理检查证实的为阳性,其余判为阴性。CT检查与核医学显像结果的比较采用四格表,检验。结果手术中28例患者共摘除28个异位病灶,均为单发。病理检查结果均为腺瘤。28例患者常规CT检查共发现22个阳性病灶,其中真阳性17个,假阳性5个,另假阴性11个,真阴性79个;25例^99Tc^m-MIBISPECT结合定位CT显像发现阳性病灶23个,无假阳性,另假阴性2个,真阴性75个。常规CT检查与核医学显像对检出病理性甲状旁腺的灵敏度分别为61％（17／28）、92％（23／25）,特异性为94％（79／84）、100％（75／75）,准确性为86％（96／112）、98％（98／100）,阳性预测值为77％（17／22）、100％（23／23）,阴性预测值为88％（79／90）、97％（75／77）;两者间比较差异有统计学意义,灵敏度：χ^2=6．98,P〈0．01,特异性：χ^2=4．61,P〈0．05,准确性：χ^2=10．30,P〈0．01,阳性预测值：χ^2=5．88,P〈0．05,阴性预测值：χ^2=5．36,P〈0．05。结论^99Tc^m—MIBI SPECT结合定位CT显像对功能亢进异位甲状旁腺的定位诊断优于常规CT,但存在一定的假阴性。     

脑肿瘤SPECT阳性显像与CT影像的对照研究

目的 :探讨99mTc MIBISPECT与CT在脑肿瘤的影像特征及其应用价值。材料和方法 :对 5 0例脑肿瘤、10例脑内非肿瘤病变患者行99mTc MIBISPECT及CT扫描 ,对其影像特点进行分析比较。结果 :99mTc MIBISPECT术前诊断脑肿瘤的灵敏度、特异性和准确性分别为 96.9%、90 .0 %和 95 .2 % ,而CT分别为 90 .6%、80 .0 %和 88.1% ,两者均无显著性差异(P >0 .0 5 ) ;99mTc MIBISPECT诊断胶质瘤术后残留与复发的灵敏度、特异性和准确性均为 10 0 % ,而CT分别为 3 0 %、75 %和 5 0 % ,前者比后者高 (P <0 .0 1)。结论 :99mTc MIBISPECT在诊断胶质瘤术后残留与复发方面可作为CT的一种有效补充手段 ;二者结合 ,对确定脑肿瘤的诊断具有重要的应用价值。     

99Tcm-MIBI透视三维显示诊断胸部病变的临床价值

评估^99Tc^m－甲氧基异丁基异腈透视三维显示法对胸部恶性病变及其在相邻部位转移灶检出方面较平面及断层显像所具有的优势。方法 回顾性分析54例恶性和6例良性经手术或病理检查证实的胸部病变，并将SPECT透视三维法与X线胸片、CT等对照研究。结果 正常对照组16例均为阴性；恶性病变组中肺癌38例，平面显像阳性率52．6％，断层阳性率78．9％，透视三维法阳性率84．2％；食管癌12例，平面阳性率41．6％，断层阳性率58．3％，透视三维法阳性率75．0％；4例纵隔及腋下恶性病变平面显像和X线无异常，CT阴性，透视三维法阳性。结论 透视三维法检出病灶优于平面和断层显像，与X线胸片、CT、纤支镜比较，灵敏度、特异性相对均衡，准确性高。     

MRI及99Tcm-MIBI显像对甲状旁腺机能亢进症的诊断价值

目的：评价MRI及^99Tcm-甲氧基异丁基异腈（MIBI）显像在原发性甲状旁腺机能亢进症（PHT）中检出病理性腺体的临床价值。方法：25例经手术证实的PHT患者实行了术前定位MRI检查，若甲状旁腺部位发现可凝软组织肿物，其信号高于周围正常甲状腺，则认为是病理性甲状旁腺，其中23例同时进行了双时相99Tcm-MIBI显像，如早期相出现放射性浓聚区且延迟相持续存在则考虑为异常甲状旁腺，MRI和99Tcm-MIBI显像阅片结果与病理检查结果对照。结果：术中共发现39个异常甲状旁腺，包括19个腺瘤（18例），19个增生（6例）和1个上皮细胞癌（1例），MRI和99Tcm-MIBI显像对检出病理性腺体的准确性分别为84．1％和85．0％,但前者灵敏度（74．4％）高于后者（67．6％），而后者的特异性（97．8％）高于前者（91．8％），两种方法联合应用准确性提高到91．3％，灵敏度为91．2％，特异性为91．3％，结论：99Tcm-MIBI显像可作为继B超检查之后的首选术前定位检查法，但最理想的最联合应用MIR和99Tcm-MIBI显像。     

99Tcm-PPM及99Tcm-MIBI肺显像诊断原发性肺癌

目的 探讨99Tcm－培普利欧霉素（PPM）及99Tcm-甲氧基异丁基异腈（MIBI）肺显像诊断原发性肺癌的临床价值。方法 对28例临床诊断肺肿瘤患者进行99Tcm-PPM ey 99T0-MIBI肺肿瘤显像并进行比较。结果 肺癌与良性病变对99T -PPMey 99T-MIBI观的摄取差异有显著性（P＜0．01）,以肺癌晚期显像摄取比值（T／NT,X－S）作为判断良恶性阈值,99Tcm-PPM及99Tcm-MIBI对肺癌诊断的灵敏度,准确性分别为90％,89．3％,和80％,82．1％,两者结合显像阳性率为95％,病灶对放射性药物的摄取与肿瘤大小无明显相关（P＞0．05）,结论 99Tcm-PPM ey 99T-MIBI肺显像对肺癌的诊断,鉴别诊断有一定的临床价值。两者联合应用可提高肺癌的阳性检出率,单独使用99Tcm-PPM优于99Tcm-MIBI。     

吸氧99Tcm-MIBI SPECT与定位CT结合对肺部病灶的鉴别诊断价值

目的 探讨吸氧99Tcm-甲氧基异丁基异腈（MIBI）SPECT与定位CT结合对肺部病灶的鉴别诊断价值,为肺部病灶的良恶性鉴别建立一种高性价比方法。方法对2008年9月至2009年3月47例可疑恶性肺部病灶患者进行前瞻性研究,对疑似炎性反应病例短期应用抗生素。所有受检者于注射99TcmMIBI前开始经鼻腔导管吸氧,注射后10min进行SPECT与CT定位融合显像,2h后进行延迟显像。对良、恶性肺部病灶（T）与对侧相应肺组织（N）的摄取比值（早期：EUR,延迟：DUR）比较应用独立样本t检验,并对EUR和DUR的诊断效率进行受试者工作特征（ROC）曲线分析。结果47例患者（32例原发性肺癌,4例肺转移,11例良性病变）共51个肺部病灶,恶性病灶39个,良性病灶12个。99TcmMIBISPECT与定位CT融合显像诊断肺部良恶性病灶的灵敏度、特异性、准确性、阳性预测值和阴性预测值分别为94．9％（37／39）、83．3％（10／12）、92．2％（47／51）、94．9％（37／39）和83．3％（10／12）。恶性病灶EUR为2．95±1．16[95％可信区间（CI）：2．57～3．32）],良性病灶EUR为1．43±0．33（95％CI：1．22～1．64）,两者差异有统计学意义（t=-4．44,P〈0．01）;恶性病灶DUR为3．19±1．74（95％CI：2．62—3．75）,良性病灶DUR为1．60±0．32（95％CI：1．39—1．81）,两者差异有统计学意义（t=-3．12,P〈0．01）。半定量ROC分析显示：以EUR≥1．625为诊断肺部恶性病灶的界值,灵敏度97．4％（38／39）,特异性83．3％（10／12）;以DUR≥1．75为诊断肺部恶性病灶的界值,灵敏度94．9％（37／39）,特异性83．3％（10／12）。结论吸氧99TcmMIBISPECT与定位CT结合显像对肺部病灶的良恶性鉴别具有较高的临床价值。     

99Tcm-HL91显像、CT和血清肿瘤标志物测定联合应用诊断肺癌

目的探讨Tc^m-4，9-二氮．3，3，10，10-四甲基十二烷-2，11-二酮肟(HL91)显像、CT、血清肿瘤标志物[癌胚抗原(CEA)、细胞角蛋白19片断(CYFRA21-1)、神经元特异性烯醇酶(NSE)]测定联合应用对肺癌的诊断价值。方法46例疑为肺癌患者在1周内进行^99Tc^m-HL91 SPECT显像、CT检查和血清肿瘤标志物测定。计算每种方法及三法联合应用诊断肺癌的灵敏度、特异性及准确性。结果最终经病理检查或细胞学诊断证实肺癌26例，经病理检查或治疗后影像学随访确诊肺部良性病变20例。^99Tc^m-HL91 SPECT显像、CT及血清肿瘤标志物测定诊断肺癌的灵敏度、特异性及准确性分别为77％、80％、78％，96％、60％、80％及50％、60％、54％。三法联合应用诊断肺癌的灵敏度、特异性及准确性分别为100％、90％、96％，其综合诊断效能明显优于其中任何一种检查方法。结论^99Tc^m-HL91显像、CT、血清肿瘤标志物测定联合应用在肺部肿瘤良恶性鉴别诊断中有较大价值。     

A comparative study of technetium-99m sestamibi and technetium-99m tetrofosmin single-photon tomography in the detection of nasopharyngeal carcinoma

The intention of this prospective study was to compare the diagnostic potential of technetium-99m sestamibi (MIBI) and a novel radiotracer,^99mTc-Tetrofosmin (Tetro), for the assessment of primary nasopharyngeal carcinoma (NPC) and the differentiation of residual disease from post-therapy changes. A total of 38 patients underwent MIBI and Tetro single-photon emission tomography (SPET) imaging at initial presentation (n=22) or following therapy (n=16). The findings were correlated with computed tomography or magnetic resonance imaging (MRI) on a site-by-site basis. Tumour/background (Tm/Bkg) ratios were obtained on coronal sections. Biopsy (nine patients) and/or 12- to 24-month clinical follow-up data were available in the post-therapy group. All primary disease sites were accurately detected by both imaging studies. Although there was no statistical difference between the two imaging techniques in the detection of primary disease, MIBI was superior to Tetro in the detection of regional lymph node metastases (sensitivity: 95% vs 79%). Tetro and MIBI SPET were true-positive in all patients (n=7) with proven residual/recurrent diseuse. In nine patients who had no evidence of residual/recurrent tumour, MRI was false-positive in five while Tetro and MIBI SPET were false-positive in two and three patients, respectively. Tm/Bkg ratios were 1.7 in all false-positive cases except one. Tetro, MIBI and MRI had specificities of 78%, 67% and 44%, and accuracies of 87.5%, 81% and 69%, respectively. The results of Tetro and of MIBI SPET were rot statistically different from one another with regard to the prediction of residual/recurrent or metastatic NPC.     

Limited value of ⁹⁹mTc depreotide single photon emission CT compared with CT for the evaluation of pulmonary lesions

Objectives

A contrast-enhanced multidetector CT (MDCT) scan is the first choice examination when evaluating patients with suspected lung cancer. However, while the clinical focus is on CT, research focus is on molecular biological methods whereby radiolabelled pharmaceuticals are injected into participants and target malignant lung tumours. We examined whether a contrast-enhanced MDCT scan supplied with an additional non-contrast enhanced high-resolution CT scan, or a newer but more expensive ^99mTc depreotide single photon emission CT (SPECT) scan, was the better first-choice examination for the work-up of pulmonary lesions. Furthermore, we examined whether a ^99mTc depreotide SPECT scan was an appropriate second-choice examination for patients with indeterminate lesions.

Methods

140 participants were included in the analysis. CT images were given a malignancy potential rating of 1, 2 or 3 with higher rating being indicative of disease. ^99mTc depreotide SPECT images were graded either positive or negative. Histopathology and CT follow-up were used as reference standard. Sensitivity, specificity and diagnostic accuracy were calculated.

Results

Overall sensitivity, specificity and diagnostic accuracy of CT were 97%, 30% and 84%, respectively. Overall sensitivity, specificity and diagnostic accuracy of ^99mTc depreotide SPECT were 94%, 58% and 76%, respectively. For indeterminate lesions sensitivity, specificity and diagnostic accuracy of ^99mTc depreotide SPECT were 71%, 68% and 69%, respectively.

Conclusion

Both CT and ^99mTc depreotide SPECT made valuable contributions to the evaluation of pulmonary lesions. ^99mTc depreotide SPECT results were not superior to CT results and did not contribute further to the diagnostic work-up. Regarding indeterminate lesions, ^99mTc depreotide SPECT sensitivity was too low.Lung cancer has a poor prognosis with an overall 5-year mortality rate of approximately 84%. However, with early detection and surgery the mortality rate can be as low as 47% [1]. Lung cancer is a major indication for chest imaging. Many years of CT imaging have seen a steady evolution of methods used to evaluate lung nodules and mass lesions. A contrast-enhanced multidetector CT (MDCT) scan is the first-choice examination when lung cancer is suspected.While the clinical focus is on MDCT, the research focus is on molecular biological methods whereby radiolabelled pharmaceuticals are injected into participants to target malignant lung tumours. Examples of such functional modalities include ^99mTc depreotide single photon emission CT (SPECT) and 18-fluoro-2-deoxyglucose positron emission tomography (18-FDG PET). However, while numerous studies have been published regarding 18-FDG PET, only a limited number, including a preliminary report by our group [2], have focused on ^99mTc depreotide SPECT [3].In this study we examine whether a contrast-enhanced MDCT scan supplied with an additional non-contrast-enhanced high-resolution CT (HRCT) scan or a newer but more expensive ^99mTc depreotide SPECT scan is the better first-choice examination when dealing with the work-up of pulmonary nodules and mass lesions. Furthermore, we examined whether a ^99mTc depreotide SPECT scan is an appropriate second-choice examination for the subgroup of patients with indeterminate lesions.     

Delineation of Target Volume for Radiotherapy of High-Grade Gliomas by 99mTc-MIBI SPECT and MRI Fusion

BACKGROUND AND PURPOSE: Computed tomography (CT) and magnetic resonance imaging (MRI) are traditionally used for treatment planning of high-grade glioma. 99m Tc-methoxy-isobutyl-isonitrile (MIBI) single-photon emission computed tomography (SPECT) showed high sensitivity and specificity in literature series. In the present study, it was investigated how the information provided by 99m Tc-MIBI SPECT and MRI fusion could affect target delineation for radiotherapy of high-grade glioma. PATIENTS AND METHODS: 21 patients with high-grade glioma were studied by MRI and 99m Tc-MIBI SPECT imaging. The gross tumor volume (GTV) was outlined on MRI (MRI-GTV) and SPECT images (SPECT-GTV). Three additional volumes were analyzed: the (MRI+SPECT)-GTV representing the whole amount of MRI-GTV plus SPECT-GTV, the (MRI&SPECT)-GTV identified by the overlapping region of MRI-GTV and SPECT-GTV, and the (SPECT/MRI)-GTV identified by the extension of SPECT-GTV outside MRI-GTV. RESULTS: MRI contrast-enhanced and 99m Tc-MIBI SPECT-positive lesions were found in all 21 patients. The average SPECT-GTV was slightly larger than the average MRI-GTV, with greater difference for resected than for unresected cases. The average increment of (MRI+SPECT)-GTV compared to MRI-GTV was 33%, being significantly higher for resected than for unresected cases (p = 0.006). CONCLUSION: The fusion of 99m Tc-MIBI SPECT and MRI significantly affected the delineation of the target volume identified by MRI alone.