简介：目的:评价定量动态增强磁共振成像(dynamiccontrastenhanced-MRI,DCE-MRI)在局部进展期直肠癌患者新辅助治疗疗效评估中的应用价值。方法:收集我院34例局部进展期直肠癌患者,于新辅助治疗前、后分别行DCE-MRI检查,根据肿瘤退缩分级,将其分为有反应组(mrTRG1、mrTRG2和mrTRG3)和无反应组(mrTRG4和mrTRG5)。测量并比较治疗前后总体及两组间DCE-MRI定量参数Ktrans(容量转移常数)、Kep(速率常数)以及Ve(血管外细胞外间隙容积分数)的差异。结果:34例患者,治疗后K^trans[治疗前、后分别为(1.48±0.80)/min,(0.88±0.45)/min,P<0.001]、Kep[治疗前为(3.29±1.25)/min,治疗后为(2.12±1.18)/min,P<0.001]均较治疗前减低,有反应组、无反应组的K^trans、Ve值在治疗前和治疗后的变化差值均有统计学意义,其中,治疗前有反应组的Ktrans值为(1.93±0.81)/min、Ve值为0.59±0.27、治疗后变化差值相应为(-1.11±66)/min、-0.14±0.16,无反应组的K^trans值为(0.82±0.49)/min、Ve值为0.35±0.16,相应的变化差值为(-0.03±19)/min、0.21±0.27。结论:定量动态增强磁共振成像对局部进展期直肠癌新辅助治疗疗效评价具有一定的价值。

简介：目的探讨肺原位腺癌(AIS)与微浸润腺癌(MIA)能谱CT特征性影像表现,研究相关病理分化情况。方法回顾性分析137例经术后病理证实的肺腺癌患者的临床资料。根据病理类型不同,分为AIS组78例和MIA组59例。分析两组患者病灶的直径、CT值、边缘是否清晰及有无毛刺征、胸膜凹陷征、空泡征,以及能量衰减曲线、病理分化情况。结果137例病灶的直径为4.1~19.8mm;磨玻璃影(GGO)109例(79.6%),混合磨玻璃影(mGGO)28例(20.4%);实性区CT值为(321±101)Hu,GGO区CT值为(578±97)Hu。AIS组病灶的平均直径短于MIA组(P﹤0.05);AIS组病灶的平均CT值明显大于MIA组(P﹤0.01)。137例病灶中边界清晰75例(54.7%),边缘可见毛刺征15例(10.9%)、胸膜凹陷征21例(15.3%),内部可见空泡征26例(19.0%)。两组病灶上述CT特征比较,差异有统计学意义(P﹤0.01)。两组患者的能谱CT能量衰减曲线均为下降型。两组患者的能量衰减曲线斜率比较,差异无统计学意义(P﹥0.05)。两组患者高分化、中分化、低分化情况比较,差异无统计学意义(P﹥0.05)。结论能谱CT可以较好地鉴别AIS和MIA,有助于临床肺腺癌患者的早期诊断。

简介：Objective:Prostatecancers(PCa)inAsianindividualsaremolecularlydistinctfromthosefoundintheirCaucasiancounterparts.ThereisnoriskstratificationtoolforAsianmenwithrapidbiochemicalrecurrence(BCR)followingradicalprostatectomy(RadP).Thisstudyaimstoassessthedetectionrateof^68Ga-prostate-specificmembraneantigen-positronemissiontomography/computedtomography(PSMA-PET/CT)fordiagnosisofclinicalrecurrenceandasatreatmentdecisionmakingtoolinAsianpatientswithBCRpost-RadP.Methods:^68GaPSMA-PETandCTbodywith/withoutbonescan[conventionalworkup(CWU)]wereperformedin55AsianpatientswithBCRwithin36monthspost-RadP.Twoblindedreviewersassessedtheimages.Detectionratesof^68GaPSMAPET/CTwereevaluated,andimpactonmanagementwasreviewedbycomparisonwithCWU.Results:MediantimetoBCRpost-RadPwas8.1months.Detectionratefor^68GaPSMA-PET/CTwas80%(44/55).Apositivescanwassignificantlyassociatedwithincreasingprostate-specificantigen(PSA)level[oddsratio(OR)=1.13(95%CI1.05–1.30),P=0.017],butnotwithhigherGleasongradeorshorterPSAdoublingtime.ComparedtoCWU,68GaPSMA-PET/CTdetectedanadditional106lesionsin33/44patientswithapositivescan,resultinginachangeinmanagementin25/44(56.8%)patients:10tohormonaltherapy(HT)andwholepelvisradiotherapy(RT)inadditiontobedRT,and15topalliativeHTalone.Conclusions:Inthepresentreport,wedemonstratedthediagnosticandtreatmentdecisionutilityof^68GaPSMA-PET/CTinAsianmenwithrapidBCR.DetectionofsmallvolumenodalandsystemicrecurrencesatlowPSAlevels(<1.0ng/mL)highlightstheroleofthetoolinassigningpatientstotreatmentintensificationwithHT-RTorpalliativeHTinpolymetastaticdisease.