Objective To compare diagnosis values of computed tomography (CT) and magnetic resonance imaging (MRI) in preoperative staging of rectal carcinoma. Methods The imaging data of 81 patients with rectal carcinoma from January 2013 to January 2017 in the Hefei Second People’s Hospital were retrospectively analyzed. Based on the postoperative pathological results, the diagnostic accordance rates of CT and MRI on the T staging and N staging were calculated. Results The sensitivities of the CT and MRI on the preoperative T staging of rectal carcinoma were 69.1% (56/81) and 82.5% (52/63), the difference was not statistically significant (χ2=3.396, P=0.065), the Kappa values was 0.521 and 0.371, respectively, the MRI on the T staging was in a good agreement with the pathological diagnosis. The sensitivitie of the T1-2, T3, and T4 stagings with CT was 70.0%, 66.7%, and 72.0%, respectively, with MRI was 83.3%, 83.3%, and 81.0%, respectively, which had no significant difference respectively between the CT and the MRI. The areas under the receiver operating characteristic curve of the T1-2, T3, and T4 stagings with the CT and MRI were 0.809, 0.689, 0.798 and 0.897, 0.826, 0.869, respectively. The sensitivities of the CT and MRI on the preoperative N staging of rectal carcinoma were 59.3% (48/81) and 65.1% (41/63), the difference was not statistically significant (χ2=0.509, P=0.476), the Kappa values were 0.371 and 0.463, respectively. The sensitivities of the N0, N1, N2 stagings with CT were 64.7%, 45.5%, 64.0%, with MRI were 70.3%, 63.2%, 72.5%, which had no significant difference respectively between the CT and the MRI. Conclusions Results of in this study show that MRI is superior to CT for judgment of tumor infiltration. Neither CT nor MRI is able to provide satisfactory assessment of lymph node metastasis.
Objective To investigate multi-slice spiral CT (MSCT) and MRI features of stasis cirrhosis and the diagnostic value of MSCT and MRI. Methods MSCT and MRI findings of 35 patients with stasis cirrhosis were studied. The size of liver and spleen, the diameter of hepatic vein (HV), enhancement pattern of liver parenchyma, contrast medium reflux in inferior vena cava (IVC) and (or) HV, ascites, number of varices and correlated abnormalities were reviewed. Results The volume index of liver and spleen of 35 patients was 4434.95 cm3 and 621.92 cm3 respectively. The mean diameter of HV of 27 patients (77.1%) was 3.61 cm and HV of other 8 patients (22.9%) were too small to show. Number of patients showed waves of borderline, inhomogeneous pattern of parenchymal contrast enhancement, contrast medium reflux in IVC and (or) HV, varices and ascites was 5 (14.3%), 29 (82.9%), 20 (57.1%), 16 (45.7%), and 6 (17.1%), respectively. Correlated abnormalities included cardiac enlargement 〔4 cases (11.4%)〕, pericardium thickening 〔11 cases (31.4%)〕, and pericardial effusion 〔2 cases (5.7%)〕. Conclusions Stasis cirrhosis mainly demonstrate liver enlargement, inhomogeneous pattern of parenchymal contrast enhancement, contrast medium reflux in IVC and (or) HV, and slight portal hypertension. MSCT and MRI play invaluable roles in diagnosis, differential diagnosis and etiological diagnosis of stasis cirrhosis.
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.
ObjectiveTo explore the correlation between coronary artery plaque composition and the gender via 128-slice spiral CT coronary angiography (128-SCTCA). MethodsBetween January and December 2012, 143 patients with coronary artery plaque diagnosed by 128-SCTCA were selected. The patients were divided into group A (no more than 50 years old, n=37) and group B (over 50 years old, n=106). ResultsThere were 29 male patients in group A, with 70 plaques including 30 fibrous plaques, 17 mixed plaques, 11 soft plaques, 12 calcified plaques; and the other 8 female patients had 13 plaques including 7 fibrous plaques, 2 mixed plaques, 2 soft plaques, and 2 calcified plaques. In group B, 56 male patients had 116 plaques, including 48 mixed plaques, 40 fibrous plaques, 14 soft plaques and 14 calcified plaques; the other 50 female patients had 90 plaques, including 36 mixed plaques, 22 fibrous plaques, and 16 soft plaques and calcified plaques. The differences of the plaque composition between males and females were not significant both in group A (χ2=0.664, P>0.05) and group B (χ2=3.708, P>0.05). ConclusionThere is no obvious correlation between gender and coronary plaque composition.
ObjectiveTo explore the differences and similarities of the featurs of lymph node metatasis of abdominal esophageal carcinoma and cardiac cancer. MethodsPreoperative CT images of abdominal esophageal carcinomas and cardiac cancers were reviewed and analysed on lymph node size and preponderant distribution. ResultsShort diameter ≥10 mm of lymph node at CT was adopted as metastasis criterion. The detection rates of abdominal esophageal carcinomas and cardiac cancers were 73.5%（144/196） and 83.7% （170/203）, respectively. Thoracic lymph node metastasis rate of abdominal esophageal carcinomas was 11.1% （4/36） in 7 area, 27.8% （10/36） in 8 area, 8.3% （3/36） in 9 area, while celiac lymph node metastasis rate was 36.1% (13/36 ） in No.7 group, 19.4% （7/36） in No.1 group, and 11.1% （4/36） in No.2 group primarily. Lymph node metastasis rate of cardiac cancers was 17.9% （5/28） in No.1 group, 28.6% （8/28） in No.2 group, 39.3% （11/28 ） in No.3 group, and 25.0% （7/28） in No.4 group for the first stop lymph nodes, and 35.7% （10/28 ） in No.7 group for the second stop primarily. ConclusionAs metastasis criterion, short diameter ≥10 mm of lymph node at CT is feasible, but there exist certain falsepositive rate. Thoracic lymph node metastasis of abdominal esophageal carcinomas is mainly in the 7, 8, and 9 area, while celiac metastasis is mainly in No.7, No.1, and No.2 groups. Lymph node metastasis of cardiac cancers is in No.1, No.2, No.3, No.4, and No.7 group primarily.
【Abstract】ObjectiveTo describe the imaging manifestations of acute necrotizing pancreatitis (ANP) on multidetectorrow spiral CT (MDCT). To investigate the relationship between pancreatic glandular necrosis and retroperitoneal inflammatory spreading and the clinical severity of ANP. MethodsA 16detector row spiral CT was used to perform contrastenhanced abdominal scanning in 90 patients diagnosed as ANP， who were prospectively enrolled into this study. Scoring of the extent of pancreatic glandular necrosis and Balthazar grading based on retroperitoneal inflammatory spreading were done at the same time. For 44 patients who met the criteria of Ranson scoring, both scoring by CT severity index (CTSI) and Ranson criteria. Multiplanar reformation technique was used for image postprocessing. Results①In 40 out of 90 patients, the pancreatic glandular necrosis was less than 30%, in 23 the necrosis was between 30%-50%, and in 27 the necrosis was more than 50%. Peripancreatic fat swelling and thickening of anterior renal fascia were observed in all cases of ANP; Peripancreatic and retroperitoneal phlegmonous fluid collection occurred in 78 patients (86.7%); 12 had fluid collection in lesser sac (13.3%); Thickening and swelling of posterior gastric wall in 71 patients (78.9%); 87 developed intestinal ileus (96.7%) and 35 patients had peritoneal effusion (38.9%); Splenic infarction in 4 patients (4.4%); 82 had pleural effusion (91.1%). ②Twelve patients were classified as Balthazar grade C， 42 as grade D and 36 as grade E. There was a statistically significant positive correlation between the extent of pancreatic glandular necrosis and Balthazar CT grade. ③In 44 ANP patients suitable for Ranson criteria, 12 cases were classified as mild (27.3%), 23 as moderate (52.3%), 9 as severe (20.5%). CTSI grading of these patients was as follows： Mild cases 0, moderate cases 25 (56.8%), severe cases 19 (43.2%). Correlation between the CTSI grades and the clinical severity of ANP was of statistical significance. ConclusionANP can demonstrate a series of imaging manifestations on MDCT. To some extent, the degree of pancreatic glandular necrosis and the extent of retroperitoneal spreading is positively correlated, and CTSI grading based on MDCT imaging features is also positively correlated with the clinical severity of ANP.
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 multislice 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.
Objective To assess the cl inical significance of transpedicular screw insertion in lower cervical vertebra assisted by multi-spiral CT (MSCT) three dimentional (3D) image reconstruction techniques. Methods Eight cervical vertebra specimens were examined by MSCT, and the messages were sent to SGI02 Workstation; according to the parameter requirements of lower cervical pedicle fixation, by using post-process of volume rendering (VR) the condition was judged and multi-plannar reformation (MPR) was used to do individual analysis; and the ideal path of screw insertion was obtained andthe related parameters were measured. After preoperative plan being finished, referring to these measured parameters, 3.5 mm screws were inserted into C3-7 pedicles of these 8 specimens. After insertion of screws, MSCT scanning and 3D reconstruction were performed again to evaluate the accuracy of lower cervical pedicle screw inserting. From May 2007 to November 2009, 28 patients who received screw insertion in lower cervical spines were given MSCT scanning and 3D reconstruction to evaluate the illness situation, to confirm shortest fixation volumes, and to collect the parameters of aim pedicle screw insertion. Results The time of insertion for each screw was (392 ± 62) seconds. It was found that one pedicle was clausura (1.25%, 1/80) and five pedicle diameters in coronal view were less than 3 mm (6.25%, 5/80), which all were not fit for screw insertion. A total of 74 screws were placed successfully. One-time success rate of screw insertion was 95.95% (71/74). The total accuracy rate was 91.89% (68/74). Six screws penetrated (8.11%). According to the Richter penetrating classification: grade one was 6.76% (5/74) and grade two was 1.35% (1/74). There were significant differences (P lt; 0.05) in penetrated rate between our study and anatomic landmark local ization (47.37%), Miller methods (25.00%), and there was no significant difference (P gt; 0.05) when compared with Abumi method (6.70%), hopper method (7.10%), pipel ine deoppilation method (5.20%) and navigation technique (11.30%). In cl inical 28 cases, 121 screws were inserted; one pedicle was clausura and one was fissure fracture, which all were unfit for insert screw in preoperative plan, the surgery project was adjusted. After operation, 17 patients (76 screws) were given MSCT scanning again. A total of 67 screws (88.16%) were placed successfully. Nine screws (11.84%) penetrated, grade one was 7.89% (6/76) and grade two was 3.95% (3/76). Conclusion It is accurate to apply MSCT 3D reconstruction techniques to measure the ideal screw canal in preoperative individual ized plan. Strictly following individual quantitative data, the safety and accuracy of the surgery can be improved. And it is feasible and available to use MSCT MPR imaging to evaluate the accuracy of pedicle screw insertion.
ObjectiveTo summarize controversy and progress of multi-slice spiral CT in efficacy evaluation of transformation therapy for advanced gastric cancer.MethodThe recent studies published at home and abroad on the spiral CT in evaluating the therapeutic effect of transformation therapy for the advanced gastric cancer were reviewed and analyzed.ResultsIn recent years, though the energy spectrum and dual-energy CT examinations had appeared, the most common tool in evaluating of the efficacy of transformation therapy for the advanced gastric cancer was the spiral CT. The most common evaluation standard was still the RECIST standard.ConclusionsSpiral CT has its outstanding diagnostic significance in therapeutic evaluation of transformation therapy for advanced gastric cancer. Although there is some controversy, with advancements of a large number of studies, it will greatly help diagnosis and treatment of advanced gastric cancer.
ObjectiveTo summarize the clinical features and imaging features of CT in the omental torsion, and in order to reduce the misdiagnosis and missed diagnosis rate of imaging features. MethodsThe data of 16 cases of omental torsion (secondary 15 cases, primary 1 case) and 286 cases of acute appendicitis (eliminated the subhepatic and retroperitoneal ectopic appendix) in our hospital from 1998 to 2014 were retrospectively analyzed. ResultsEleven cases of omental torsion suffered from the shifting pain in right lower quadrant. No obvious shifting abdominal pain was observed in other 4 cases whose main manifestations were abdominal tenderness and rebound tenderness around umbilicus. The patient of the remaining 1 case had enclosed mass in the area of left groin with pain and suffered from continuous periumbilical pain. Abdominal spiral CT examination was performed in 16 patients before operation. Increased signal intensity of globular soft tissue, which deviating from McBurney's point, was found at level of distal umbilicus by preoperative spiral CT in 13 cases. One case of omental torsion associated with ncarcerated inguinal hernia was missed. ConclusionsOmental torsion manifests chiefly shifting pain in right lower quadrant, abdominal tenderness, and rebound tenderness around umbilicus. It is easily confused with appendicitis. Abdominal spiral CT should be chosen as a preferred means in preoperative diagnosis of omental torsion.