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Diagnostic Value of Mandibular Fractures by Multiple Spiral Computed Tomography

目的 探讨多层螺旋CT对下颌骨骨折的诊断价值。 方法 对2007年4月-2009年10月下颌骨不同部位骨折的45例患者进行多层螺旋CT轴位扫描，并行多平面、表面遮盖法等三维重建，对下颌骨骨折CT表现特征作回顾性分析。 结果 45例下颌骨骨折中，位于下颌体骨折24例，下颌角骨折5例，下颌升支骨折6例，髁部骨折13例，冠突骨折2例；颞下颌关节脱位中，单侧脱位3例，双侧脱位5例。 结论 多层螺旋CT能准确诊断下颌骨各部位骨折，对诊治方案具有重要价值。

Effect of MultiSlice Spiral Computer Tomography Combined with Serum Amyloid A Protein on Preoperative Rectal Cancer Staging

摘要:目的: 探讨64排多层螺旋CT(MSCT)和血清淀粉样蛋白A(serum amyloid A protein, SAA)联合术前评估直肠癌在肿瘤分期诊断中的作用。 方法 :纳入经根治术治疗的直肠癌患者通过MSCT扫描进行评估,同时取患者静脉血测量术前SAA水平,行MSCT分期与MSCT和SAA联合分期以比较二者的诊断价值。 结果 :本研究纳入患者121例。MSCT检测T分期的准确度为851%。在评估淋巴结转移方面,MSCT和SAA联合分期的准确度为760%,明显高于MSCT分期(595%, 〖WTBX〗P lt;0001)。MSCT正确判断所有远处转移。同单一的MSCT检测相比,MSCT和SAA联合评估能显著的提高术前TNM分期的准确率(785% vs. 636%,〖WTBX〗P =0011)。 结论 :MSCT联合SAA检测比单一的MSCT检测显著提高了直肠癌术前肿瘤分期和淋巴结转移方面的准确度。这种新的术前评估方法的为肿瘤进展评估和术前治疗决策提供了更加可靠的信息。Abstract: Objective: To determine the role of combinative assessment of 64 multislice spiral computer tomography (MSCT) and serum amyloid A protein (SAA) in preoperative rectal cancer staging. Methods : Enrolled consecutive rectal cancer patients undergoing curative surgery were evaluated by MSCT scan. Meanwhile venous blood specimens were taken to measure preoperative SAA concentration. Both MSCT staging and MSCT plus SAA staging were performed to compare with each other. Results : The study population consisted of 121 patients. The accuracy of T staging was 851% for MSCT. The accuracy in evaluating lymph nodes metastases was 760% for MSCT plus SAA compared with 595% for MSCT alone (〖WTBX〗P lt;0001). All the distant metastases were correctly detected by MSCT. The method combining MSCT with SAA led to significant improvement on preoperative TNM staging compared with MSCT alone (785% vs. 636%, 〖WTBX〗P =0011). Conclusion : MSCT plus SAA showed greater accuracy than MSCT alone in rectal cancer staging and lymph node metastases. This novel strategy of preoperative evaluation appears to provide more accurate information on tumor progression and preoperative therapy decisionmaking.

Multislice CT Differential Diagnosis Between Thymoma andMalignant Lymphoma In The Anterior Mediastinum

摘要:目的:研究胸腺瘤与前纵隔(血管前间隙)淋巴瘤的MSCT表现,提高对二者的诊断与鉴别诊断能力。方法:回顾性分析经手术病理证实的30例胸腺瘤与18例血管前间隙淋巴瘤MSCT表现,着重观察肿瘤的密度、形态及其与周围结构的关系。结果:30例胸腺瘤中,24例良性胸腺瘤与邻近大血管分界清晰,肿块表现 “D”字或反“D”字状,平扫CT值16~59 Hu,增强CT值20~110 Hu;6例侵袭性胸腺瘤边界不清,呈分叶状、不规则形,密度不均,平扫CT值23~42 Hu,增强CT值23~60 Hu。18例淋巴瘤中,单发于前上纵隔者6例,其余12例呈多结节、肿块状,侵入血管间隙生长,致大血管受压,增强扫描呈轻度强化,常伴有其它部位淋巴结增大。结论:MSCT能清晰显示胸腺瘤与前纵隔淋巴瘤的影像学表现特征,并能有效提高对二者的鉴别诊断。Abstract: Objective: To diagnosis and differentiate thymoma and malignant lymphoma in the anterior mediastinum on the basis of multislice CT (MSCT) imaging features. Methods:We retrospectively reviewed 30 cases with thymoma and 18 cases with malignant lymphoma proven by surgery and pathology.More attention was put on the density, morphology and relation with the surrounding structures of the tumors. Results: The CT manifestations of 30 cases of thymoma were shown as: For 24 cases of benign thymoma, the boundaries were clear, the shapes were “D” signs or contra“D” signs, CT attenuation value were 1659Hu and 20110Hu on unenhanced and contrastenhanced scanning. For 6 cases of malignant thymoma, the boundaries were unclear, the shapes were lobulated or irregular, the density was heterogeneous, CT attenuation value were 2342Hu and 2360Hu on unenhanced and contrastenhanced scanning. For 18 cases of malignant lymphoma, 6 cases were located at anterior mediastinum, 12 cases were nodes or multiple mass, enveloped the neighboring vessel structures, mildly enhanced on contrastenhanced scanning, and associated with enlargement of lymph nodes in other place. Conclusion: MSCT can display the imaging features of thymoma and anterior mediastinal lymphoma, and effectively differentiate thymoma and mediastinal lymphoma.

Sixteen-Slice Spiral CT Evaluation of Bowel Obstruction——The Value of Multiplanar Reformation Technique

【Abstract】　Objective　Using 16-slice multi-detector row helical CT (16-slice MDCT) to investigate the value of multiplanar reformation technique (MPR) in the diagnosis of bowel obstruction. Methods　Thirty patients with surgically (27 cases) or clinically (3 cases) proofed diagnosis of bowel obstruction underwent 16-slice MDCT examination of the entire abdomen. All cases had plain CT scan, while 20 cases had additional contrast-enhanced CT scan at portal venous phase. In addition to the conventional axial images, the original CT raw data were then reconstructed into both coronal and sagittal images using MPR technique. Imaging findings were analyzed on axial, MPR coronal and sagittal images. Results　Among the 30 patients with bowel obstruction, there were 8 cases caused by adhesion, 7 by simple intestinal tumor, 5 by intussusception (including caused by instestinal tumor), 4 by abdominal hernia, 2 by volvulus, 1 by ileocecal abscess, 1 by stenosis of mesenteric artery，1 by retroperitoneal cyst, and 1 by carcinoma in pancreatic tail. Six patients developed intestinal ischemia or strangulation. Both axial and MPR images correctly depicted the presence of bowel obstruction. Based on CT axial view （AV）, the site and the underlying etiology of bowel obstruction were determined in 26 (86.7%) and 22 (73.3%) patients respectively, while the combination with MPR coronal and sagittal images improved the diagnostic performance to 29 (96.7%) and 27 (90.0%) patients respectively. Both axial and MPR images correctly revealed the presence of intestinal ischemia or strangulation in 5 （83.3%）patients. Conclusion　MPR technique of MDCT is very useful for evaluating the site and etiology of bowel obstruction, as well as the circulation status of involved bowel loop.

Retrospective Analysis of Multi-detector Spiral CT in Adrenal Ganglioneuroma（8 Cases）

目的:探讨肾上腺节细胞神经瘤的CT表现特征，以提高此病CT诊断的准确性。方法:回顾性分析8例经病理确诊为节细胞神经瘤的CT表现，并与病理结果对照研究。结果:8例肿瘤边界均清晰，无周围组织和血管侵犯征象。CT平扫呈均匀稍低密度，CT值约18～35 HU，其中内有点状钙化者3例（37.5%）。CT增强扫描有轻度强化，CT值约30～45 HU。CT征象符合病理表现。结论:肾上腺节细胞神经瘤有一定的CT表现特点，多层螺旋CT扫描有助于提高肾上腺节细胞神经瘤诊断的准确性。

Retrospective Analysis of Multidetector Spiral CT Contrast Enhanced Scan for Chronic Pyelonephritits

目的:研究多层螺旋CT(MDCT)增强扫描对慢性肾盂肾炎的诊断价值。方法:病例组:2008年3月至2009年3月经我院诊治的慢性肾盂肾炎患者30例,均行MDCT增强扫描及静脉肾盂造影(IVP)检查,两者间隔时间不超过1周;对照组:同期无肾脏疾患,无尿路感染史,因其他原因来做腹部CT增强扫描的患者25例。由两名不同年资的腹部影像医师对拟定的征象进行观察、评价。结果:两医师对本组病例的诊断一致性极佳K=0.812,Plt;0.05)。病例组30例,双肾病变14例,单肾病变16例。单肾病变中,左肾12例,右肾4例。MDCT增强扫描显示肾盏轻度变形2例(6.7%),肾盏裸露18例(60.0%),实质凹陷征23例(76.7%),肾盂轻度扩张积水21例(70.0%),肾盂壁增厚、强化21例(70.0%),肾功能减退15例(50.0%)。5例(16.7%)仅表现为肾盂壁增厚、强化。MDCT增强扫描与IVP对肾实质凹陷征,肾盂壁增厚、强化及肾盏轻度变形的显示率有统计学差异(Plt;0.05)。结论:MDCT增强扫描能清晰地显示慢性肾盂肾炎的病理变化。与IVP比较,它能提供更多肾实质的信息,对判定慢性肾盂肾炎所造成的肾脏损害程度及疾病预后具有很高的价值,不过对肾盏轻度变形的显示有赖于延迟扫描。

FABRICATION AND APPLICATION IN VITRO OF PEDICLE GUIDE DEVICE FOR PEDICLE SCREWS INSERTION

Objective To evaluate the accuracy of pedicle guide device for the placement of the pedicle screws. Methods Pedicle guide device was designed and made for the anatomical trait of pedicle. The 3-Danatomical data of the thoracic pedicles were measured by multislice spiral CT in two embalmed human cadaveric thoracic pedicles spine(T1 -T10). Depending on transverse section angle(TSA) and sagittal section angle(SSA) of pedicle axis, the degree of horizontal dial and sagittal dial were adjusted in the guide device. The screws wereinserted bilaterally in the thoracic pedicles by using the device. After pulling the screws out, the pathways were filled with contrast media. The TSA and SSA of developed pathways were measured. Results Analysis of the difference between pedicle axis and developed pathway was of no statistical significance(P＞0.05). Conclusion The guide device could be easilyoperated and guarantee high accuracy of the pathways of screws and the incidence of pedicle penetration could be significantly reduced.

Multi-Slice Spiral CT Angiography of Liver with Three-Dimensional Reconstruction Technique and Its Clinical Applications

Clinical Application of Multi-Slice Spiral CT in Portal Vein Imaging

Objective To study the clinical significance of multi-slice spiral CT in portal vein imaging. Methods One hundred and thirty seven cases underwent enhanced scan with GE Light SpeedQX/i4 CT scanner were collected, including 41 cases of liver cancer, 20 cases of hepatic cirrhosis, 21 cases of cavernous hemangioma of liver, 9 cases of hepatic abscess, 6 cases of carcinoma of gallbladder, 14 cases of cholangiocarcinoma, 16 cases of pancreatic carcinoma, and 5 cases in normal. The results of portal vein images were reconstructed with three-dimensional software and analyzed. Results In 109 cases, portal vein, cranial mesenteric vein, and splenic vein were demonstrated successfully in the stage of portal vein: volume rendering images were clear in 84 cases, and maximum intensity projection images and multiplanar reconstruction images were clear in 109 cases. Forty-five cases of portal hypertension, 18 cases of opened collateral circulation, 15 cases of portal vein tumor thrombus, 1 case of splenic vein tumor thrombus, and 6 cases of large cavernous hemangioma were demonstrated successfully. Conclusion The portal vein imaging with multi-slice spiral CT can show the dissection and lesions of portal vein and its branches clearly, and can provide the clinical evidence for clinicians to formulate a treatment plan correctly.

Study of Multi-slice CT Portography Imaging in the Diagnosis and Evaluation of Esophageal and Gastric Varices in Cirrhosis Patients

ObjectiveTo study the application value of multi-slice CT portography (MSCTP) in the diagnosis and evaluation of esophageal and gastric varices (EGV) caused by cirrhosis. MethodsPatients with cirrhosis diagnosed between September 2009 and December 2012 were screened in this study. And the consistency of MSCTP and digestive endoscopy in the diagnosis, classification and grading of EGV in cirrhosis were evaluated. ResultsA total of 78 patients were included in this study, and there were 55 patients with EGV diagnosed by endoscopy, including 35, 16 and 4 patients with GOV1, GOV2 and IGV1 respectively by Satin type standards; and the number of patients with mild, moderate and severe EGV by general grading standards was 2, 15, and 37, respectively. In this cohort, the findings of MSCTP examination also showed that 58 patients had EGV, including 36, 17, 4 and 1 patients with GOV1, GOV2, IGV1 and IGV2 by Satin type standards; and the number of patients with grade I,Ⅱ andⅢ EGV by Kim grading standards was 5, 16 and 37, respectively. Statistical analysis showed that there was a high consistency between endoscopy and MSCTP in the diagnosis (Kappa=0.712, P=0.000), typing (Kappa=0.732, P=0.000) or grading (Kappa=0.863, P=0.000) of EGV. ConclusionMSCTP has a high application value in the diagnosis and severity evaluation of EGV in patients with cirrhosis.