Objective:To evaluate the value of multilayer dynamic CT scan in the preoperative diagnosis and staging of rectal carcinoma.Methods: CT findings of a retrospective analysis of 38 cases with pathologically confirmed cancer, study characteristics of partial image, Adjacent tissue invasion and distant organ metastasis, And compared with postoperative pathology.Results:Intraluminal mass 15 cases, Intraluminal mass associated with of bowel wall thickening 12 cases, The a tumor breakthrough serosa layer and surrounding tissue invasion 7 cases; Tumor invasion of adjacent organs or with distant metastasis 4 cases; consistent rate compared with pathological was 81.5%(31/38).Conclusion: Multilayer enhanced CT scan is well consistent rate in the diagnosis and staging of rectal cancer compared with pathologic staging, Preoperative contrast enhanced CT scanning have guiding significance for clinical choice of surgical approach, With higher value of clinical application.

Objective To discuss the applied research of CT perfusion imaging on the diagnosis of splenic diseases. Methods 20 patients with splenic diseases which accepted treatment in our hospital from January 2012 to December 2014 were assigned into group A,including 7 cases of splenic lymphoma patients(group A1),8 cases of leukemia patients with spleen infiltration(group A2)and 5 cases of splenic metastasis(group A3). At the same time,20 healthy persons were selected as the control(group B). Results The result of CT scan was normal in group B,but that showed a variety of lesions in the spleen in group A. The spleen perfusion volume in the group A was significantly higher than that in the control group(P<0.05). The detection rate of CT perfusion imaging was significantly higher than that of CT scan(P<0.05). TIP and MTT in group A were significantly higher than those in group B,while BF,PEI and BV were significantly lower(P<0.05). Conclusion CT perfusion imaging has advantage of simple,short imaging time,less trauma,and a high diagnostic value for the spleen disease,which is an ideal detection means and can be used in clinic.

Objective To evaluate the diagnostic value and limitation of MRI for chromophobe renal cell carcinoma.Methods MRI features of 5 cases with pathology proved chromophobe renal cell carcinoma were analyzed retrospectively.Results All tumors showed homogenous isoin-tensity or slightly hypointensity on T1 weighted images and isointensity or slightly hyperintensity on T2 weighted images.Slightly hyperintensity were showed on DWI images,the mean ADC value of tumors was 1.42×10-3 mm2/s.On the contrast enhanced images,all the mass showed slight to moderate enhancement ,1 case had spoke-wheel-like enhancement,1 case showed flowed out blood vessels in the tumor.Conclusion The preoperative diagnosis is difficult for chromophobe renal cell carcinoma,MRI is a valuable method which could provide useful information for qualitative diagnosis.

Objective: To assess the effect of percutaneous transluminal septal myocardial ablation (PTSMA) on mid- to long-term left ventricular diastolic function in patients with hypertrophic obstructive cardiomyopathy (HOCM) by real-time three-dimensional echocardiography (RT-3DE). Methods: A total of 46 HOCM patients who received 2DE and RT-3DE examination before and after (with the mean of 18.8 months) PTSMA were studied. The ratios of E/A and E/Ea were analyzed, RT-3DE was conducted to collect the images, to obtain 17-segmant volume-time curve and to calculate the parameters of rEDV, rESV, rSV and rPFR respectively. Results: The follow-up echocardiography in all 46 patients indicated that the ratio of E/Ea decreased after the operation (12.04 ± 3.29) vs (15.70 ± 5.68),P<0.001, the rSV of left ventricular anterior wall middle segment and anterior septal middle segment decreased after the operation,P<0.05, while the rPFR of anterior septal middle segment, rear septal middle segment and apical segment increased,P<0.05. Conclusion: PTSMA may improve local left ventricular diastolic function in HOCM patients, RT-3DE provides a new method and viewing angle for HOCM evaluation.

Objective To discuss the correlation between MSCT morphological index of emphysema and pulmonary function test (PFT) indexes. Methods We randomly selected 33 cases with chronic obstructive pulmonary disease (COPD),and conducted CT and PFT in a week. The whole lung was scanned by MSCT at the end of deep aspiration,and the post-processing workstation was used for quantitative determination of a total of 12 morphological indexes,including the density of lung, pulmonary diameter line,lung volume,and etc,then their correlation with lung function index was analyzed.Results FEV1.0%had correlation with upper right lung density ( =0.391, =0.391), lower right lung density ( =0.465, =0.038),the mean lung density ( =0.576,=0.576), and total lung capacity (=0.471, =0.471),upper right lung volume ( =0.413, =0.049) . FEV1.0/FVC had correlation with left lower lung density ( =0.392, =0.024), the mean lung density ( =0.703, = 0.000), total lung transverse diameter ( = 0.521, = 0.521), upper right lung maximum transverse diameter ( =0.627, =0.627), and total lung capacity ( =0.549, =0.549) correlation. FVC had correlation with upper right lung maximum transverse diameter ( = 0.378, = 0.378), characterized by maximum transverse diameter (=0.349, =0.037) . TLC had correlation with mean lung density (=0.523,=0.523), upper right lung maximum transverse diameter ( =0.454, =0.454), and total lung capacity (= 0.001), the right lung volume ( = 0.492, = 0.492) . Conclusion MSCT lung morphology quantitative indicators have good clinical application value in the diagnosis and assessment of emphysema patients.

Objective To observe the characteristics of different level of normal abdominal aorta’s time-flow,time-velocity curve and to investigate the hemodynamic factors in role of the occurrence and development of abdominal aorta’s disease.Methods PC-MRI scanning was performed on 60 normal volunteers T12/L1-L4/5 disc at the level of abdominal aorta,time-flow and time-veloci-ty curve were generated respectively.The characteristics of blood flow curves at different levels of abdominal aorta were observed. Results The time-flow,time-velocity curve of the normal abdominal aorta in different levels have 2nd phase (no diastolic reflux) and 3rd phase (diastolic reflux).Conclusion The characteristics of blood flow curves of different levels of abdominal aorta are dif-ferent.

Objective To explore the value of DWI (diffusion weighted imaging,DWI) in diagnosis of bladder cancer in clinical T stage by comparing DWI and CT.Methods Seventy-five patients with bladder cancer underwent MRI plain scan,enhanced diffusion-weighted imaging and CT scan,to make a diagnosis preoperative clinical T stage according to their image.Then we compared the diffusion-weighted imaging and CT results with pathological staging results to assess the value of DWI in bladder tumor staging.Results For clinical T staging bladder cancer,the diagnostic accuracy rate was 83.5％ and 72％ for DWI and CT,resectively,statistical analysis showed a significant difference (P ＜0.05).Conclusion Magnetic resonance diffusion weighted imaging can accurately diagose the clinical T stage of bladder cancer,and has a higher value than CT.

Objective To discuss the imaging features of germ cell tumors on CT and MRI.Methods Preoperative CT and MRI data of 11 pathologically proved germ cell tumors were analyzed retrospectively.A total of 11 cases were enrolled in the study,4 cases received plain and contrast-enhanced CT scan,1 received plain and contrast-enhanced MRI scan,and 6 received both CT and MRI scan.Results Histological examinations revealed 11 testicular neoplasms,among which 4 cases were seminoma,1 was embryonal carcinoma,1 was immature teratoma,3 were mixed germ cell tumors,1 was spindle cell rhabdomyosarcoma and 1 was carcinoid.Most germ cell tumors were iso density or low density with or without clear boundary,mild to moderate enhancement on CT scan.On MRI scan,most germ cell tumors showed iso-hyper intensity on T1WI,hypointensity,isointensity or hyperintensity on T2 WI,heterogeneous mild to moderate enhancement,high signal intensity on DWI,and low or high signal intensity on ADC.Conclusion Typical testicular germ cell tumor imaging performance has a certain specificity,but the atypical germ cell tumor lacks specificity.So the final diagnosis still depends on the pathology.

In this paper are discussed the causes of artifacts appearing in the 24 hours' dynamic electrocardiogram. Then a new method based on the least square algorithm to discriminate the artifacts is proposed. Finally, the artifacts in the electrocardiogram (ECG) data collected from the hospital are analyzed. The results of experiment show that it is possible to quickly and effectively discriminate the artifacts caused by trembling, ill contact of electrode, and motion. The new method is conducive to ensuring clinicians' correct judgment of dynamic electrocardiogram signals.
Algorithms ; Artifacts ; Diagnosis, Computer-Assisted ; methods ; Electrocardiography, Ambulatory ; methods ; Humans ; Least-Squares Analysis ; Signal Processing, Computer-Assisted

OBJECTIVETo clarify the clinicopathological significance of lymphatic vessel density (LVD) and distribution in pancreatic cancer.

METHODSWe measured LVD in 43 pancreatic cancer specimens by immunostaining with specific lymphatic endothelium marker, and examined their relationship with well-defined clinicopathological variables.

RESULTSIntratumoral LVD (9.4 +/- 10.0) was significantly lower than periturmoral (16.0 +/- 9.7) (P < 0.001) and nontumoral LVD (13.5 +/- 6.0) (P < 0.01). Increased peritumoral LVD correlated significantly with tumor staging (P < 0.05) and lymph node involvement (P < 0.05).

CONCLUSIONThe lymphatic vessels distribution in pancreatic cancer samples and peritumoral lymphangiogenesis may promote the malignant progression and lymph node metastasis of pancreatic cancer.

Adenocarcinoma ; pathology ; Adult ; Aged ; Aged, 80 and over ; Female ; Humans ; Immunohistochemistry ; Lymph Nodes ; pathology ; Lymphatic Metastasis ; Lymphatic Vessels ; pathology ; Male ; Middle Aged ; Pancreatic Neoplasms ; pathology