螺旋CT多期扫描在进展期胃癌术前分期的价值

目的：评价螺旋CT多期扫描在进展期胃癌术前分期的价值。材料和方法：前瞻性研究一组36例胃癌病例,采用国际胃癌协会通用的TNM标准,螺旋CT与手术和病理对照,观察螺旋CT进展期胃癌病变的检出率,分期的准确性。结果：36例进展期胃癌,螺旋CT病变检出率100％,分期准确性83．33％（25／30）,3例（10％）CT分期低于外科病理分期,2例（6．66％）CT分期高于外科病理分期。结论：螺旋CT多期扫描在胃癌术前分期方面有较高的准确性,值得临床应用。     

胃癌螺旋CT术前评估及与手术病理分期对照研究

目的:应用螺旋CT行胃癌术前评估,并将CT分期与手术病理分期进行比较。方法:98例胃癌患者术前行腹部螺旋CT检查,并实施手术分期和病理分期。结果:所有患者行手术治疗,其中16例(16%)无法切除,82例(84%)手术切除。CT扫描中胃壁的厚度和浆膜的累及有相关性(P<0.001)。CT和手术预测病理分期的符合率分别为68%和52%。CT过度分期只有17%。结论:螺旋CT是胃癌患者术前检查的一种有效的方法,可预测胃癌病灶的可切除性,从而避免某些不必要的剖腹手术或使手术方案更加合理。CT过度分期的概率较低,其分期的准确率高于手术。     

进展期胃癌术前CT与手术结果的对比研究

目的:探讨进展期胃癌的CT表现及其对手术可切除性的术前评估价值。方法:分析100例经胃镜活检和/(或)手术病理证实的进展期胃癌的CT表现,评估手术切除的可行性,并与手术病理结果进行对照研究。结果:胃底贲门癌25例,胃体癌41例,胃窦癌19例,病变占据2个分区以上者15例。100例胃癌均显示胃壁有不同程度地增厚,部分胃壁有软组织肿块形成,黏膜面有溃疡形成,胃腔及贲门狭窄,贲门管壁增厚,食管下段受累以及周围组织器官侵犯等。CT对进展期胃癌的定位、定性诊断与胃镜活检和/(或)手术病理符合率高,肿瘤检出率可达100%。术前判断为可切除组的病例手术切除率达91.2%。结论:进展期胃癌术前CT诊断准确率较高,对肿瘤可切除性术前的评估有较高的参考价值。     

16排螺旋CT胃癌术前T分期的诊断价值

目的利用16排螺旋CT双期增强扫描对胃癌进行T分期并与病理对照,确定多排螺旋CT(multi-detec-tor row CT,MDCT)在术前T分期中的作用。资料与方法经胃镜证实的62例患者(63个病灶),术前采用16排螺旋CT平扫和动脉期、门静脉期双期增强扫描,随后根据5 mm层厚横断面图像情况重组薄层动脉期和门静脉期多平面重组(multiplanar reconstruction,MPR)图像,由两名资深放射科医师共同完成T分期,术后与病理对照。结果 MDCT结合MPR技术后对胃癌的检出率为96.7%,其中对早期胃癌的检出率为66.7%,进展期胃癌的检出率为100%。胃癌的MDCT大体分型准确率为88.9%。63个胃癌MDCT术前T分期总体准确率为71.4%,其中早期胃癌准确率为33.3%,进展期胃癌准确率为75.4%。结论采用MPR后处理技术的MDCT配合动态增强扫描对进展期胃癌的检出、大体分型和T分期准确率明显提高。     

胃癌CT检查价值的分析

目的 通过对进展期胃癌术前CT分期，确定胃癌的治疗方案，避免盲目地手术探查。方法 对67例胃癌患者进行CT扫描，对无周围器官和远处转移者进行手术，手术所见和CT表现进行对照。结果 CT扫描对于进展期胃癌的检出率为100％，手术所见与CT表现的符合率为92％。结论 进展期胃癌的术前CT检查能够准确地对胃癌进行CT分期。     

胃癌螺旋CT影像学表现与临床分期关系的研究

目的:探讨胃癌患者CT影像学表现与胃癌临床分期关系的研究,做好胃癌患者术前分期评估,以利治疗。方法:采用西门子6层螺旋CT,对45例经病理证实为胃癌患者,术前行低张力水充盈螺旋CT三期增强扫描,将CT三维图像上肿瘤最大直径与厚度、强化方程度、肿瘤瘤周低密度区厚度,与术中大体病理及术后病理进行对照。结果:成像后病灶厚度、强化程度及瘤周低密度区厚度与胃癌临床分期密切相关(P<0.05)。结论:增强螺旋CT对胃癌检查,可以为明确胃癌术前分期、选择术式及评估预后作出选择。     

螺旋CT三期扫描对进展期胃癌胃壁浸润的研究

目的 探讨进展期胃癌螺旋CT三期扫描的影像学表现及其对胃壁浸润深度的评估价值。材料与方法 31例病理证实的进展期胃癌,分别于注射对比剂后25－30s(动脉期）、70－80s(非平衡期）及180－120s(平衡期）行螺旋CT扫描,其后行多平面重建。结果 进展期胃癌检出率100％。80．6％（25／31）的病灶与胃壁分界截然,19．4％（6／31）的病灶与周围胃壁呈移行状态。病灶强化情况在不同时相有所不同。动脉期：11例肿瘤突向胃腔内的表面部分呈线样强化,其余部分未见明显强化,病灶分为2层;16例肿瘤呈不规则团块状强化;4例病灶轻度均匀强化。67．74％（21／31）的病例此期显示最清楚。非平衡期：20例病灶呈不均匀强化;6例病灶分层,内层强化最明显,中间出现一条不甚连续的低密度带,外层呈团块状强化;5例病灶均匀强化。12．90％（4／31）的病例此期显示最清楚。平衡期：27例病灶均匀强化,但强化程度较非平衡期时降低;4例病灶强化程度下降,但仍分层。6．45％（2／31）的病例此期显示最清楚。12．90％（4／31）的病例在上述三期中均很清楚。19例手术者,T分期准确率达78．94％（15／19）,其中T2与T3之间鉴别的准确性为81．25％（13／16）。经多平面重建,3例避免了T分期错误。结论 进展期胃癌螺旋CT三期扫描,动脉期对于病灶的显示及其横向蔓延范围的估计有临床实用价值;平衡期对评估胃癌浸润深度的准确性高。多平面重建对于深入观察病变与周围组织的关系有帮助。     

注液摇篮体位CT对胃癌手术评估价值研究

目的：探讨以水作对比剂的摇篮变换体位CT检查对胃癌手术评估价值。方法：128例胃癌病人口服温开水，低张法使胃囊充盈应用摇篮技术行CT检查，进行术前CT分期并与手术病理结果对照。结果：128例胃癌中108例术前CT分期与术后临床病理分期相吻合，准确率84.4%。11例（8.6%)CT分期低于临床分期，而9例（7.0%)CT高估。CT分期对胃癌手术切除评估准确率93.8%(120/128)。＜1.0cm和≥1.0cm肿大淋巴结的检出率分别为23.1%和76.9%。根治术后送检的197个淋巴结中，CT发现167个淋巴结，敏感性为84.8%(167/197)；在112个阳性淋巴结中，有98个CT提示转移，特异性为87.5%(98/112)。结论：以水作对比剂摇篮CT扫描明显提高了胃癌术前分期准确率和手术切除评估符合率，尤其对显示肿块与周围组织器官结构的关系及肿大淋巴结摇篮体位扫描更具有明显的优越性。     

多层螺旋CT 增强扫描在进展期胃癌诊断的应用分析

目的：探讨多层螺旋CT增强扫描对进展期胃癌 TNM 分期的诊断价值。方法35例经胃镜及病理证实为进展期胃癌患者,进行多层螺旋CT平扫及三期增强扫描,扫描方法采用大螺距,根据胃镜提示的病变部位采用不同的扫描体位。对扫描图像行胃癌的TNM 分期（淋巴细胞短径、长径、CT值、胃癌侵及范围）并与术后病理分期对照,分析多层螺旋CT在诊断进展期胃癌TNM分期的诊断敏感性和特异性。结果35例患者按照上述体位扫描,进展期胃癌的检出率为100％,胃底贲门癌13例,胃体部癌9例,胃窦部胃癌11例,全胃癌2例;T分期与病理分期符合率为73．44％,N分期与病理分期符合率为53．73％,M分期与病理分期符合率为91．32％。结论多层螺旋C T增强扫描在进展期胃癌诊断中及对临床手术指导具有重要价值。     

动态增强CT扫描对胃癌的术前诊断与分期

目的分析胃癌的CT表现,并评价其诊断意义。方法 54例经临床、手术病理证实的胃癌患者均经腹部对比前与对比后动脉期、门脉期及平衡期CT扫描。对所有患者的CT表现进行了回顾性分析。结果研究证实,本组54例中有1例早期胃癌和53例进展期胃癌。早期胃癌表现为单层胃壁局限性增厚,增强后动脉期与门脉期病灶呈局部强化。进展期胃癌按Borrmann分类法,53例中有Ⅰ型7例,表现为蕈伞型,Ⅱ型10例,表现为局限溃疡型,Ⅲ型19例,表现为浸润溃疡型,Ⅳ型17例,表现为浸润型。进展期胃癌于增强后动脉期,肿块表面明显强化,门脉期及平衡期,病变趋向于均匀强化。与术后病理对照,术前CT诊断与分期的准确率为90.2%。结论 CT动态增强扫描对胃癌的术前诊断与分期具有较高的准确性,并对临床治疗方案的制定或手术方式的选择,具有重要意义。     

MSCT增强扫描在胃癌术前TNM分期中的临床价值

目的探讨MSCT增强扫描在进展期胃癌的诊断与分期方面的价值。方法对45临床诊断为胃癌的患者进行术前MSCT动态增强扫描,根据结果作出分期诊断,并与手术及病理TNM分期相对照。结果CT表现为胃壁多层结构破坏,淋巴结及邻近脏器的转移。MSCT的T、N、M分期准确率分别为77．8％、71．2％和68．6％。结论MSCT增强扫描术前评估进展期胃癌TNM分期准确性高,对胃癌患者术前评估有较高的临床参考价值。     

CT在胃癌诊治中的作用

探讨ＣＴ在胃癌诊断和治疗中的价值。对２５例术后作ＣＴ随访及５６例术前经ＣＴ检查的胃癌患者资料分别进行手术近，远期疗效和手术切除率分析。另对４７例胃癌ＣＴ所见进行术前手术切除可能性预测。分析同期１３例胃肠造影和／或内镜未能确诊的ＣＴ检验结果，对照手术以探讨ＣＴ对胃癌的诊断价值。     

Preoperative staging of gastric carcinoma with multidetector spiral CT

PURPOSE: To assess the accuracy of Multidetector computed tomography (MDCT) in the preoperative staging of gastric cancer. MATERIALS AND METHODS: Between March 2002 and October 2002, 27 patents with histologically proven gastric adenocarcinoma underwent MDCT. Unenhanced and contrast-enhanced CT scans were obtained after the oral administration of 400-600 ml of water for gastric wall distension. Biphasic enhanced scans were performed after the automatic injection of 2ml/kg of contrast agent at a flow rate of 3.5 ml/sec with a scan delay of 35 and 70 sec. The images were evaluated for: lesion morphology, degree of wall infiltration, presence of locoregional lymphadenopathies and distant metastases. Based on the findings, a TCMD staging system was established according to the criteria reported in the literature. All the patients underwent surgery, and the preoperative MDCT staging was evaluated against the pathology findings. RESULTS: MDCT staging was correct in 17/27 patients (62.9%). The T parameter was correctly assessed in 24/27 cases (88.9%), whereas it was understaged in 1 case (3.7%) (T1 stage at CT vs T2 at surgery) and overstaged in 2 cases (7.4%) (T3 vs T2). The N parameter was correctly evaluated in 19/27 patients (70.4%), understaged in 6/27 (22.2%) and overstaged in 2/27 (7.4%). CONCLUSIONS: MDCT may be proposed for the staging of gastric carcinomas and, although accuracy in N staging remains low in comparison to single-detector spiral CT, it provides a larger amount of diagnostic information.     

双体位CT扫描在进展期胃癌分期中的应用

目的研究双体位CT扫描在进展期胃癌分期中的作用。方法将85例进展期胃癌病例分成二组单体位组（即单纯行仰卧位CT扫描）30例,双体位组（即采用仰卧位与补充体位行CT扫描）55例。口服水作对比剂行CT检查,分别行术前CT分期与手术结果的比较和分析。结果双体位组术前分期的准确性为89．09%,单体位组仅为60%。两组间有显著差异（Ρ＜0．05）。结论双体位CT在对检出病变、确定病变范围和判断肿瘤对毗邻器官的侵犯方面明显优于单体位组,因此双体位CT有助于提高进展期胃癌CT分期的准确性。     

螺旋CT三期增强扫描对进展期胃癌的诊断价值

目的评价胃癌螺旋CT三期增强扫描的表现及TNM分期。方法65例进展期胃癌行低张水充盈螺旋CT三期增强扫描,并与手术病理进行对照。结果高/中分化腺癌与低分化腺癌的CT强化特点具有显著差异(χ2=33.336,P=0.000)。T分期和N分期的诊断准确性分别为76.9%(50/65)和73.8%(48/65)。结论不同组织学类型的胃癌螺旋CT三期强化特点不同。     

Assessment of gastric cancer: value of breathhold technique and two-phase spiral CT

The purpose of this study was to evaluate the capabilities of subsecond spiral CT in detecting and staging of gastric cancer. Our study included 40 patients with endoscopically detected gastric carcinomas. Two-phase spiral CT was performed within one breathhold each. Distension of the stomach was achieved by intravenous application of scopolamine and drinking of 500 ml water. After bolus injection of contrast medium, scanning was performed in the arterial and venous phase. Gastric tumour extention and lymph node involvement was assessed. Gastric cancer was detected in 39 of 40 cases (sensitivity 97.5 %). Location of the tumour was correctly assessed in all cases. In 31 of the 39 cases (79.4 %) CT staging was accordant with pathological staging. One hundred two (70 %) of 145 nodes infiltrated by tumour tissue were detected and 144 (42.8 %) of 336 nodes free of metastatic involvement were found. The predictive values of positive and negative results for the detection of lymph node metastases were 67.1 and 75 %, respectively. Spiral CT is recommended for staging of gastric cancer. Received: 21 November 1997; Revision received: 9 March 1998; Accepted: 10 March 1998     

Comparison of hydro-US and spiral CT in the staging of gastric cancer.

The purpose of this study was to compare the diagnostic accuracy of hydro-ultrasonography (US) and spiral computed tomography (CT) in the staging of gastric cancer. Forty-three patients with gastric cancers confirmed at surgery underwent hydro-US and spiral CT on the same day prospectively. Hydro-US and spiral CT were done after ingestion of water. US and CT images were independently analyzed. After surgery, pathological findings according to TNM classification were compared with US and CT findings. The detection rate for T1 tumors was 75% (12/16), and all T2-T4 tumors were detected (27/27). In the T class, good correlation with pathology occurred in 55.8% of cases for US and 58.1% for CT, and there was no difference in staging accuracy between US and CT (P=.7667). Overstaging occurred in 14% for US and CT. Understaging occurred in 30.2% for US and 27.9% for CT. In the N class, good correlation with pathology occurred in 60.5% for US and 55.8% for CT, and there was no difference in staging accuracy between US and CT (P=.0949). Overstaging occurred in 4.7% for US and 18.6% for CT, and understaging occurred in 34.9% and 25.6%, respectively. The diagnostic accuracy of hydro-US and spiral CT in the staging of gastric cancer was between 55.8% and 60.5%, and there was no significant difference in staging accuracy between hydro-US and spiral CT, except for a tendency to overstaging by CT and understaging by US in the N class (P<.05).     

应用动态CT和水充盈技术行胃癌CT分期与手术对照研究

自１９９１年２月－１９９３年４月，我们采用水做为胃的口服对比剂，结合低张和动态增强扫描对一组６６例胃癌进行了前瞻性研究，术前ＣＴ与手术病理严格对照。统计结果：本组胃癌ＣＴ分期总的准确性８６．６３％，胃癌可切除性术前估价准确性９２．４２％。表明采用水做为口服对比剂结合动态扫描方式，明显提高了胃癌ＣＴ分期的准确性，值得临床推广应用。