首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 62 毫秒
1.
CT灌注成像在腮腺肿瘤鉴别诊断中的临床价值   总被引:5,自引:0,他引:5  
目的探讨多层螺旋CT灌注成像技术定量评价腮腺良、恶性肿瘤的血液动力学特点及其对腮腺良恶性肿瘤的鉴别诊断价值。方法53例患者共57个病变,其中良性肿瘤35例,恶性肿瘤18例,全部经术后病理证实。术前行CT灌注检查。采用Philips perfusion功能软件包获取组织的时间密度曲线(time density calve,TDC)及CT灌注参数,包括灌注量、增强峰值(PH)、达峰时间(TTP)、血容量(BV)、平均通过时间(MTT)。采用Wilcoxon符号秩和检验进行统计学处理。结果腮腺良性肿瘤的CT灌注参数的中位数及四分位间距[25%CI 75%(Q1,Q2)]分别为:灌注量73.5(18.7,113.3)ml·100g^-1·min^-1、PH 34.5(17.7,53.1)HU、TTP 20.0(13.6,34.4)S、BV 38.5(29.1,63.3)ml·100g^-1、MTT 7.6(4.5,28.7)s。腮腺恶性肿瘤的CT灌注参数分别为:灌注量135.9(101.4,195.2)ml·100g^-1·min^-1,PH 49.1(32.7,59.4)HU,TTP 12.9(11.3,14.6)s,BV 67.5(52.4,109.5)ml·100g^-1,MTT 6.0(5.1,7.6)s。统计结果显示,CT灌注参数BF、BV、TTP的中位数及四分位间距在腮腺良恶性肿瘤之间差异具有统计学意义(P值均〈0.05),而PH、及MTT之间差异无统计学意义(P〉0.05);腺淋巴瘤、其他良性肿瘤、恶性肿瘤的TDC的差异也有统计学意义(P值均〈0.05)。结论CT灌注扫描技术对腮腺良恶性肿瘤的鉴别诊断具有一定价值。  相似文献   

2.
目的探讨肺癌的CT灌注参数与微血管密度(MVD)和由脱氧葡萄糖正电子发射计算机体层扫描(FDG-PET)所得的标准摄取值(SUV)的相关性,评价CT灌注成像在反映肺癌肿瘤血管生成方面的价值。方法对50例肺癌患者行CT灌注成像,计算病灶的血流量(BF)、血容量(BV)、平均通过时间(MTT)、表面渗透性(PS)。其中14例行FDG.PET检查,测量病灶的SUV。取50例患者的病理标本作免疫组织化学CD34染色,计数MVD,将CT灌注参数与MVD及SUV进行相关性分析。结果BF、BV、MTT及PS的平均值分别为97.30ml·100g^-1·min^-1,8.86ml·100g^-1,6.75s及34.52ml·100g^-1·min^-1;MVD平均值61.82个/高倍镜;14例患者的SUV平均值5.96。BF与SUV及MVD均呈正相关(r值分别为0.727、0.543,P〈0.05);MVD与BV及PS亦呈正相关(r值分别为0.375、0.346,P〈0.05);MVD与SUV呈正相关(r=0.565,P〈0.05)。结论CT灌注参数与MVD及SUV相关,是在体评价肿瘤血管生成的理想方法。  相似文献   

3.
目的测量并初步确定正常肾脏皮质CT灌注各参数值范围及肾细胞癌(RCC)各CT灌注参数值变化特点;分析RCC各CT灌注参数值与其微血管密度(MVD)计数的关系。资料与方法对26名肾功能正常的志愿者及30例经手术病理证实的RCC患者行CT灌注扫描,所得数据送入Advanced Workstation4.2工作站,应用perfusion3软件分别测量正常肾脏及肿瘤各CT灌注参数值,包括血流量(BF)值、血容量(BV)值、平均通过时间(MTT)值及毛细血管表面通透性(PS)值;用免疫组织化学过氧化物酶标记的链霉素卵白素法(SP法)检测RCC中MVD的表达(人工计数);分析RCC实性部分与正常肾脏皮质间各CT灌注参数值差异是否存在统计学意义,分析RCC各CT灌注参数值与其MVD计数的相关性,以上两组数据的采集应用双盲法。结果26名正常人肾脏皮质CT灌注BF值(502.73±99.03)ml·min^-1.100g^-1,BV值(25.35±9.12)ml/100g,MTT值(3.13±0.83)s,PS值(62.15±12.29)ml·min^-1.100g^-1;30例肾癌患者CT灌注BF值、BV值、MTT值及PS值分别为(301.74±250.41)ml·min^-1.100g^-1、(18.17±11.54)ml/100g,(6.62±4.91)s和(21.59±12.75)ml·min^-1.100g^-1,MVD计数为(47.67±30.92)条。RCC与正常肾脏皮质间各CT灌注参数值差异有统计学意义(P〈0.01,tBF=4.904,tBV=3.243,tMTT=-4.376,tPS=14.973),正常肾脏皮质的BF值、BV值及PS值均高于肾癌实性部分;MTT值则相反。肾癌CT灌注的BF值和BV值与其MVD计数呈正相关,r值分别为0.736和0.632(P〈0.01);而MTT值与其MVD计数呈负相关,r值为-0.487(P〈0.01);PS值与其MVD计数无相关性。结论RCC CT灌注参数BF值、BV值和MTT值与MVD计数存在相关性,这些CT灌注参数值在一定程度上可反映活体的肿瘤血管生成状况和恶性程度,有助于临床制定治疗方案,判断疗效及预后。  相似文献   

4.
目的:利用64层螺旋CT探讨孤立性肺结节CT灌注成像技术中对比剂注射速率对结果的影响。方法:对50例孤立性肺结节患者进行前瞻性研究。随机将患者分为两组,注射速率分别为3ml/s(组1)及5ml/s(组2);男性34例,女性16例。年龄范围28~73岁,平均年龄56.02±9.11岁。其中,43例通过手术证实;2例通过CT引导经皮肺穿刺活检证实;1例通过纤支镜活检证实;4例同时发现全身多处转移性肿瘤。结果:组1中,血流量值:49.006±42.429ml·100g^-1·min^-1、血容量:3.358±4.608ml/100g,平均通过时间:6.307±3.772s,表面渗透性:9.378±9.040ml·100g^-1·min^-1。组2:血流量:52.917±61.206ml·100g^-1·min^-1,血容量:3.045±4.671ml/100g,平均通过时间:6.079±3.831s,表面渗透性:8.142±7.082ml·100g^-1·min^-1。组1与组2结节血流量(P=0.249〉0.05);血容量(P=0.737〉0.05);平均通过时间(P=0.776〉0.05);表面渗透性(P=0.454〉0.05)。不同注射速率的两组孤立性肺结节灌注值统计学差异无统计学意义(P〉0.05)。结论:不同的对比剂注射速率(3ml/s和5ml/s)对64层螺旋CT孤立性肺结节灌注成像无明显影响。  相似文献   

5.
多层螺旋CT灌注成像对肾积水肾功能可复性的预测价值   总被引:2,自引:0,他引:2  
目的 探讨多层螺旋CT(MSCT)灌注成像在肾积水肾功能可复性预测中的价值。方法 建立大白兔单侧输尿管部分梗阻肾积水模型。分为对照组,梗阻2、4及8周组,后3组在解除梗阻后再饲养4周,各组在梗阻解除前、后均行MSCT灌注扫描,测量右肾皮、髓质的血流量(BF)、血容量(BV)值并进行比较。然后处死实验动物制成普通病理切片,观察各组病理改变。结果 (1)MSCT检查显示梗阻2周组在梗阻解除后,其右肾皮质的BF、BV分别为(864±32)ml·100g^-1·min^-1、(19.5±0.9)ml/100g,较梗阻解除前[分别为(630±37)ml·100g^-1·min^-1、(14.0±1.2)ml/100g)]上升,差异有统计学意义(t值分别为-19.37、-12.11,P值均〈0.01);右肾髓质的BF、BV分别为(182.1±7.5)ml·100g^-1·min^-1、(8.37±0.51)ml/100g,比梗阻解除前[分别为(132.6±3.9)ml·100g^-1·min^-1、(5.13±0.35)ml/100g)]也明显上升,差异有统计学意义(t值分别为-23.52、-11.51,P值均〈0.01)。(2)梗阻4周、8周组在梗阻解除后,其右肾皮质BF[分别为(525±15)、(512±10)ml·100g^-1·min^-1]、BV[分别为(12.8±0.6)、(9.4±1.0)ml/100g]与梗阻解除前[分别为(515±23)、(505±16)ml·100g^-1·min^-1,(12.2±0.8)、(10.3±0.5)ml/100g]相比,差异无统计学意义(P值均〉0.05)。(3)组织学上,梗阻时间短,解除梗阻后的病理变化较轻,梗阻时间长,解除梗阻后的病理变化重。结论 MSCT灌注成像不仅能够提供肾积水形态学的信息,又能提供血流灌注的信息,在肾积水肾功能可复性预测中有一定价值。  相似文献   

6.
目的研究头颈部肿瘤CT灌注与肿瘤血管生成因子(VEGF)的相关性。方法对85例共88个(恶性77个,良性11个)头颈部肿瘤术前行CT灌注检查。采用螺旋CT机自带软件绘制感兴趣区(ROI)的时间-密度曲线(TDC)并计算ROI强化峰值(PH)、达峰时间(PT)、平均通过时间(MTT),病灶相对强化峰值(RPH)和灌注量(PF)。其中35例切取与CT灌注靶层面相同的组织切片,行CD34、VEGF抗体免疫组织化学染色,分析肿瘤CT灌注成像表现与微血管密度(MVD)和VEGF表达的相关性。结果(1)头颈部肿瘤CT灌注成像TDC主要有3种类型,77个恶性肿瘤中53个(68.9%)表现为速升速降型;9个淋巴瘤中6个TDC表现为低平型曲线,与68个其他肿瘤中仅有9个为低平型曲线相比差异有统计学意义(P〈0.05)。(2)甲状腺癌呈高灌注,其PF(中位数为82.2ml·min^-1·100g^-1)与淋巴瘤PF(中位数为24.5ml·min^-1·100g^-1)、头颈鳞癌PF(中位数为23.8ml·min^-1·100g^-1)相比差异有统计学意义(P〈0.05)。(3)11个良性肿瘤的MVD均数为(44.7±3.4)条/高倍视野,24个恶性肿瘤的MVD为(49.6±14.8)条/高倍视野,良恶性肿瘤间差异无统计学意义(P〉0.05);VEGF在恶性肿瘤呈强阳性者15个,弱阳性9个;在良性肿瘤呈强阳性1个,弱阳性10个,VEGF的表达强阳性率在良、恶性肿瘤差异有统计学意义(P〈0.01)。(4)MVD(中位数40.0)与PH(中位数26.9)、RPH(中位数14.5)和PF(中位数46.8)有明显相关性(r值分别为0.35、45.49和0.41),VEGF(中位数4.0)表达与MTT(中位数16.7)呈负相关(r=-0.41)。结论CT灌注成像TDC形态对头颈部肿瘤诊断及鉴别诊断有一定的帮助。MVD、VEGF与CT灌注相关,CT灌注成像可以反映肿瘤微循环情况。  相似文献   

7.
目的 探讨多层螺旋CT(ISCT)灌注成像在定量评价软组织恶性肿瘤介入治疗前后肿瘤血管生成和介入治疗后早期疗效监测中的应用价值。方法 24只成功种植VX2肿瘤的新西兰大白兔,数字表法随机分为介入组和对照组,每组12只,分别于肿瘤种植后第14天、介入治疗后第3天行常规CT平扫和灌注扫描,计算肿瘤组织和正常肌肉组织的血流量(BF)、血容量(BV)、平均通过时间(MTT)和表面通透性(PS)值,分析各参数之间的差异性;并将各灌注参数分别与肿瘤微血管密度(IVD)值和血管内皮生长因子(VEGF)平均吸光度(A)值进行相关性分析。结果 肿瘤种植后第14天,介入组肿瘤BF、BV、MTT、PS值分别为(303.3±69.9)ml·100g^-1·min^-1、(7.02±3.10)ml/100g、(1.99±0.28)s、(65.9±9.4)ml·100g^-1·min^-1,与正常肌肉组织相比[分别为(11.8±5.0)ml·100g^-1·min^-1、(1.04±0.47)ml/100g、(17.92±7.19)s、(13.1±6.4)ml·100g^-1·min^-1]差异有统计学意义(F值分别为4285.82、1867.46、413.04、698.42,P〈0.01);与对照组肿瘤的各参数值差异无统计学意义(F值分别为2.47、2.03、0.02、0.53,P〉0.05)。介入组肿瘤IVD值和VEGF平均A值分别为(50.1±4.1)个/高倍视野、0.352±0.011,与对照组肿瘤[分别为(50.2±3.7)个/高倍视野、0.352±0.009]差异无统计学意义(F值分别为0.02、0.19,P〉0.05)。介入治疗后第3天(即种植后第18天),介入组肿瘤BF、BY、MTT、PS、MYD值和YEGF平均A值分别为(7.5±24)ml·100g^-1·min^-1、(1.20±0.23)ml/100g、(3.29±0.57)s,(40±1.5)ml·100g^-1·min^-1、(16.0±2.4)个/高倍视野、0.215±0.008,与对照组相比[分别为(390.2±116.3)ml·100g^-1·min^-1、(8.47±2.53)ml/100g、(1.88±0.34)s、(76.9±11.3)ml·100g^-1·min^-1、(84.8±5.6)个/高倍视野、0.366±0.013]差异有统计学意义(F值分别为10166.91、1310.19、272.84、1649.80、1239.72、4168.91,P〈0.01);与介入治疗前相比,差异也有统计学意义(t值分别为74.53.49.62、-16.82、35.36、50.41、65.64,P〈0.01)。、肿瘤BF、BV、PS值与IVD值和VEGF平均A值呈正相关(r值均〉0.7,P〈0.05);MTT值与VEGF平均A值呈负相关(r=-0.78,P〈0.05),而与肿瘤IVD值无明显相关性(r=-0.315,P〉0.05)。结论 NSCT灌注成像是一种定量评价肿瘤血管生成、血流灌注及血管通透性改变的功能成像方法,可以无创、准确地对肿瘤介入治疗早期疗效进行定量评价和动态监测。  相似文献   

8.
目的评价64层螺旋CT脑灌注成像(CTP)和头颈部CT血管成像(CTA)检查对颈内动脉(ICA)及大脑中动脉(MCA)狭窄和(或)闭塞所致脑缺血的诊断价值。方法对69例经DSA证实为单、双侧ICA或MCA狭窄和(或)闭塞患者(病例组)及10名正常成年志愿者(对照组)分别进行64层螺旋CT头颅平扫、CTP和CTA检查,观察CTP成像特点,并对各组脑血流量(CBF)、脑血容量(CBV)、平均通过时间(MTT)和达峰时间(TTP)进行定量分析。结果CTA诊断为单侧ICA狭窄和(或)闭塞的患者17例中,5例仅累及分水岭区,10例同时累及MCA供血区和分水岭区。单侧ICA重度狭窄和(或)闭塞的灌注异常患者12例,非症状侧与症状侧的分水岭区CBF分别为(41±9)和(38±8)ml·100g^-1·min^-1,差异无统计学意义(t=2.08,P〉0.05);MTT分别为(5.2±1.1)和(10.9±2.6)s,差异有统计学意义(t=7.24,P〈0.01)。CTA诊断为双侧ICA重度狭窄和(或)闭塞的13例中,双侧CTP均表现为MCA供血区加分水岭区灌注缺损。25例单侧MCA狭窄患者,4例灌注正常;17例脑灌注缺损区为MCA供血区,4例为MCA供血区加分水岭区。12例双侧MCA重度狭窄的患者,灌注损伤区均为MCA供血区加分水岭区。结论64层螺旋CT头颈部CTA联合应用脑CTP检查,为ICA和MCA狭窄和(或)闭塞的临床治疗提供了更为详尽客观的影像依据。  相似文献   

9.
目的:研究VX2肿瘤生长过程中微血管生成情况,以及肿瘤微血管密度与MSCT灌注值之间的变化关系。方法:8只荷瘤大白兔分别于肿瘤生长第7、14、21、28天行MSCT灌注扫描,分别测量肿瘤血流量(BF)、最大强化指数(PEI)、峰值到达时间(TTP)及血容量(BV)作为灌注指标。于第7、14、21、28天肿瘤组织行免疫组化CD34染色,进行微血管密度(MVD)计数。不同时间段灌注值比较行方差分析SNK均数比较,各项MSCT各灌注指标与MVD计数之间行Pearson相关分析。结果:肿瘤生长大小分别为(14.1±2.9)mm、(27.7±4.5)mm、(39.5±8.3)mm和(52.5±7.8)mm,第7天MSCT灌注值BF为(135.10±13.08)ml/100g/min,其余灌注参数分别为PEI(73.11±5.25)HU,TTP 18.57±1.38,BV(45.0±2.53)ml/100g,至第28天,相应灌注值为BF(46.05±7.55)ml/100g/min、PEI(70.25±6.25)HU、TTP(35.90±1.90)s、BV(51.63±4.77)ml/100g,第7、14天的CT灌注值与第21、28天灌注值中的BF和TTP差异存在显著性意义,4次灌注中的BV和PEI差异无显著性意义。CT灌注值中的BV与MVD存在相关性,PEI与MVD存在弱相关,BF、TTP与MVD之间没有明显相关性。结论:兔VX2肿瘤灌注值BF在生长早期较高,随肿瘤生长灌注值BF下降。肿瘤BV值和PEI值与VX2肿瘤血管生成存在相关关系,MSCT灌注成像可以反映VX2肿瘤微血管生成特征以及肿瘤在不同生长时期的微血管变化情况。  相似文献   

10.
目的探讨256层CT全颈部灌注成像对鼻咽癌颈部淋巴结转移的临床应用价值。资料与方法采用256层CT对经临床及病理证实的25例患者行全颈部CT灌注成像,其中鼻咽癌15例,颈部转移淋巴结65枚,同时取颈部正常肌肉组(65枚淋巴结);结节性甲状腺肿10例,颈部有未转移淋巴结55枚。记录转移淋巴结、未转移淋巴结及颈部正常肌肉的灌注参数值[灌注(P)、血流量(BF)、血容量(BV)、达峰时间(TTP)],并比较各灌注参数值在转移淋巴结与未转移淋巴结及正常肌肉间的差异。结果转移淋巴结组、正常肌肉组及未转移淋巴结组P值中位数分别为32.54HU、8.04HU和20.92HU,PEI均数分别为36.14HU、14.74HU和35.95HU,TTP值均数分别为36.35s、53.05s、48.65s,BV值中位数分别为31.17ml/100g、8.28ml/100g和18.98ml/100g。转移淋巴结P值、PEI值与BV值均高于正常肌肉组织(P<0.01),TTP值小于正常肌肉组织(P<0.01)。转移淋巴结与未转移淋巴结间P值、PEI值、BV值差异无统计学意义(P>0.05),转移淋巴结TTP值小于未转移淋巴结(P<0.0...  相似文献   

11.
The Knee injury and Osteoarthritis Outcome Score (KOOS) is a self-administered instrument measuring outcome after knee injury at impairment, disability, and handicap level in five subscales. Reliability, validity, and responsiveness of a Swedish version was assessed in 142 patients who underwent arthroscopy because of injury to the menisci, anterior cruciate ligament, or cartilage of the knee. The clinimetric properties were found to be good and comparable to the American version of the KOOS. Comparison to the Short Form-36 and the Lysholm knee scoring scale revealed expected correlations and construct validity. Item by item, symptoms and functional limitations were compared between diagnostic groups. High responsiveness was found three months after arthroscopic partial meniscectomy for all subscales but Activities of Daily Living.  相似文献   

12.
13.
14.
Objective To investigate endovascular treatment of traumatic direct carotid-cavernous fistulas (CCF) and their complications such as pseudoaneurysms. Methods: Over a five-year period, 22 patients with traumatic direct CCFs were treated endovascularly in our institution. Thirteen patients were treated once with the result of CCF occluded, 8 twice and 1 three times. Treatment modalities included balloon occlusion of the CCF, sacrifice of the ipsilateral internal carotid artery with detachable balloon, coll embolization of the cavernous sinus and secondary pseudoaneurysms, and covered-stem management of the pseudoaneurysms. Results All the direct CCFs were successfully managed endovascularly. Four patients developed a pseudoaneurysm after the occlusion of the CCF with an incidence of pseudoaneurysm formation of 18.2% (4/22). A total number of 8 patients experienced permanent occlusion of the ICA with a rate of ICA occlusion reaching 36.4% (8/22). Followed up through telephone consultation from 6 months to 5 years, all did well with no recurrence of CCF symptoms and signs. Conclusion Traumatic direct CCFs can be successfully managed with endovascular means. The pseudoaneurysms secondary to the occlusion of the CCFs can be occluded with stent-assisted coiling and implantation of covered stents.  相似文献   

15.
Acute limping may be the result of multiple pathologies in children. The differential diagnosis varies based on the age of the child. Irrespective of age, the initial imaging work-up includes AP and frog leg radiographs of the pelvis and ultrasound; MRI may sometimes be helpful. In children less than 3 years, infections and trauma are most frequent. MRI is the imaging modality of choice when osteomyelitis is clinically suspected. Between the ages of 3 and 10 years, transient synovitis of the hip and Legg-Calvé-Perthes disease are main considerations but infection, inflammation and focal bony lesions are also considered. In children over 10 years, slipped capital femoral epiphysis also is considered.  相似文献   

16.
Introduction Ankle sprains are the most common musculo-skeletal injury that occurs in athletes,particularly in sports that require jumping and landing on one foot such as soccer,and basketball(1-4).These injuries often result in significant time loss from participation,long-term disability,and have a major impact on health care costs and resources(5-8).  相似文献   

17.
18.
KEY POINTS ·High-intensity interval training(HIT)is characterized by repeated sessions of relatively brief,intermittent exercise.often performed with an“a11 out”effort or at an intensity close to that which elicits peak oxygen uptake(i.e.,≥90%of VO2 peak).  相似文献   

19.
20.
In response to the ENFSI and EDNAP groups’ call for new STR multiplexes for Europe, Promega® developed a suite of four new DNA profiling kits. This paper describes the developmental validation study performed on the PowerPlex® ESI 16 (European Standard Investigator 16) and the PowerPlex® ESI 17 Systems. The PowerPlex® ESI 16 System combines the 11 loci compatible with the UK National DNA Database®, contained within the AmpFlSTR® SGM Plus® PCR Amplification Kit, with five additional loci: D2S441, D10S1248, D22S1045, D1S1656 and D12S391. The multiplex was designed to reduce the amplicon size of the loci found in the AmpFlSTR® SGM Plus® kit. This design facilitates increased robustness and amplification success for the loci used in the national DNA databases created in many countries, when analyzing degraded DNA samples. The PowerPlex® ESI 17 System amplifies the same loci as the PowerPlex® ESI 16 System, but with the addition of a primer pair for the SE33 locus. Tests were designed to address the developmental validation guidelines issued by the Scientific Working Group on DNA Analysis Methods (SWGDAM), and those of the DNA Advisory Board (DAB). Samples processed include DNA mixtures, PCR reactions spiked with inhibitors, a sensitivity series, and 306 United Kingdom donor samples to determine concordance with data generated with the AmpFlSTR® SGM Plus® kit. Allele frequencies from 242 white Caucasian samples collected in the United Kingdom are also presented. The PowerPlex® ESI 16 and ESI 17 Systems are robust and sensitive tools, suitable for the analysis of forensic DNA samples. Full profiles were routinely observed with 62.5 pg of a fully heterozygous single source DNA template. This high level of sensitivity was found to impact on mixture analyses, where 54–86% of unique minor contributor alleles were routinely observed in a 1:19 mixture ratio. Improved sensitivity combined with the robustness afforded by smaller amplicons has substantially improved the quantity of data obtained from degraded samples, and the improved chemistry confers exceptional tolerance to high levels of laboratory prepared inhibitors.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号