Right ventricular (RV) function is very important for patients with respiratory and cardiovascular disorders resulting in RV impairments. Since RV has complex geometry of the chamber, it is difficult to accurately measure the RV volumetric parameters with conventional imaging modalities, especially those with dilated and abnormal RV. With the emergence and wide use of new noninvasive imaging modalities in accessing the cardiac anatomy and function, real-time three-dimensional echocardiography (RT3DE), multi-detector row computed tomography (MDCT) and new MRI sequences, noninvasive quantitative assessment of the RV function has attracted more and more worldwide attention.

Mesenchymal stem cells(MSCs)is a kind of non hematopoietic stem cell from the mesoderm, which can self renew, proliferate and perform multilineage differentiation. Due to the characteristics of acquiring easily and low immunogenicity, it has become the main cell for myocardial infarction. In this article, the biology and the immunology of the MSCs is reviewed, the safety and the validity of the therapy on myocardial infarction with MSCs and the HGF/MSCs is introduced. And furthermore, it also explains the possible mechanism and the problems of how to improve the cardial function.
Cell Differentiation ; Hematopoietic Stem Cells ; Humans ; Mesenchymal Stem Cell Transplantation ; Mesenchymal Stromal Cells ; Myocardial Infarction ; therapy

With the development of life science and medical technology,myocardial fibrosis is being increasingly recognized as a new therapeutic target for heart diseases.However,traditional methods for detection of myocardial fibrosis,such as myocardial biopsy and laboratory assay of serum metabolites or enzymes,are not satisfactory in meeting the clinical demands because of their intrinsic limitations.Molecular imaging may non-invasively and quantitatively evaluate the presence/absence,degree and turnover of myocardial fibrosis in vivo with good specificity,thus being useful for clinical assessment and intervention.Currently,the commonly used molecular imaging modalities for evaluation of myocardial fibrosis include SPECT,PET and MRI.It is hopeful that the molecular probe for targeted ultrasound technology may also be developed in the near future.This review highlights the current status and future trends of molecular imaging in myocardial fibrosis.

0.05).Conclusion The segmental bronchus were visualized reliably by low-dose multi- detector-row CT with 17 mAs. Low-dose CT can be adapted to CT screening for early lung cancer.

Objective To determine the value of CT and MRI in the evaluation of littoral cell angioma(LCA) of spleen.Methods Two experienced radiologists retrospectively analyzed the clinical data,CT and MRI findings of 12 patients with pathology proven LCA of spleen.The patients underwent noncontrast enhanced CT scan,then enhanced CT (n =10) and MRI (n =3) were performed.Results The majority of patients (8/12) showed splenomegaly,with no obvious signs and symptoms of hypersplenism.The majority of patients (10/12) had the uncountable hypodense lesions,a few (2/12) had only a single lesion.None of the lesions contained any calcification or envelopement.On CT,the majority (7/10) of the lesions demonstrated well circumscribed border,with some lesions (3/10) demonstrating a less distinct border.The enhanced scan for low-density nodules demonstrated slow progressive enhancement.On MRI,all the LAC had well circumscribed borders,and demonstrated T1-hypointense and T2-hyperintense signalswith punctual hypointense in the T2 WI,and progressive enhancement on the post contrast images.DWI showed an increased diffusion of the lesions compared to the normal appearing splenic tissue.Conclusion CT and MR imaging of littoral cell angioma of spleen has certain imaging characteristics,those particular findings may potentially aid in the diagnosis.

Objective To evaluate the clinical diagnostic value of prospective electrocardiograph (ECG)-gating of CT cardiac angiography in congenital heart diseases of Chinese population through a Meta-analysis.Methods The articles were searched to study CT prospective ECG-gating in diagnosis of congenital heart disease from January 1995 to February 2016 in domestic and foreign publications.The study quality was assessed by the Quality Assessment for Diagnostic Accuracy Studies and the data extraction was performed.The software of Meta-disc1.4 was used for heterogeneity test.Different effect models were choosen according to the results of heterogeneity analysis.Meanwhile,this soft was used to calculate the sensitivity,specificity,likelihood ratio and its 95％ confidence interval (CI),respectively.The forest maps and summary receiver operator characteristic (SROC) curve were drawn.In addition,the area under curve (AUC) was calculated.Results Twelve articles were included in the Meta-analysis.The study included 1 431 congenital heart malformations confirmed by surgery or cardiac catheterization angiography.CT prospective ECG-gating technique had no heterogeneity in sensitivity and specificity of congenital heart disease.The total sensitivity,the total specificity,positive likelihood ratios,negative likelihood ratios and its 95％ CI of CT cardiac angiography were 96％ (95％ CI 94％ to 97％),100％ (95％ CI 100％ to 100％),365.94(95％ CI 231.18 to 579.26),0.04(95％ CI 0.03 to 0.05) with fixed effect model,respectively.The AUC of the SROC was 99.86％,Q =0.987 9.Conclusions Prospectively ECG-gating of CT cardiac angiography has high sensitivity and specificity in the diagnosis of congenital heart diseases.Its AUC of the SROC is large.It has high diagnostic value in congenital heart diseases.

To evaluate the global left and right ventricular function and establish the CT reference data of global ventricular function parameters in normal people, 56 normal subjects (male, 28 cases; female, 28 case) were scanned with retrospective ECG gated 64-detector row CT. Ten time-phases in the cardiac cycle were reconstructed and short-axis images were acquired. On the cardiac analysis software, endo-cardium and epi-cardium of left and right ventricle were delineated and global function parameters were calculated. Left and right ventricular end-diastolic volume (LV/RVEDV), end-systolic volume (LV/RVESV), stroke volume (LV/RVSV), and wall mass (LV/RVWM) were significantly greater (P < 0.05) in men than in women, but cardiac output (LV/RVCO) and ejection fraction (LV/RVEF) exhibited no difference in women and men. In man group and woman group, LVWM was greater than RVWM (P < 0.01). LVESV, RVESV and body mass Index (BMI) were shown to have significant negative-correlation; the correlation coefficient = -0.54 and r = -0.53. LV/RVSV, LV/RVEF and BMI were noted to have significant positive-correlation; the correlation coefficients were 0.87/0.97 and 0.69/0.62, respectively. The normal global left and right ventricular functions differ significantly according to gender and body size.
Adult ; Aged ; Electrocardiography ; Female ; Heart Ventricles ; diagnostic imaging ; Humans ; Image Processing, Computer-Assisted ; Male ; Middle Aged ; Reference Values ; Retrospective Studies ; Stroke Volume ; Tomography, Spiral Computed ; methods ; Ventricular Function, Left ; physiology ; Ventricular Function, Right ; physiology

The objective of this comparative study is to determine the MDCT features of solitary pulmonary tuberculous cavity and malignant cavity and to analyze the advantages there-of in differential diagnosis. The clinical data and MDCT findings of 51 cases of pulmonary tuberculous cavities and 39 cases of malignant cavities were reviewed retrospectively, which include the general aspects of patients, the manifestation of cavity and the changes of adjacent structures. The results revealed that the tuberculous cavity tends to locate in the upper lobe or the superior segment of lower lobe, and it is usually acompanied with cavity wall calcification, satellite lesions, peripheral inflammation, lymph node calcification, small diameter and thin wall thickness. The malignant cavities, showing no disposition to locate in a lobe or segment, are characterized by mural nodules, off-center cavity, lobulation, coarse speculation, lymph node enlargement, vascular clustering sign, big diameter and thick wall. In conclusion, with multiplanar reconstruction on multi-detector row CT, we could elaborate the cavities and the accompained lesions, thus contributing to a correct diagnosis in most cases.
Adenocarcinoma ; diagnostic imaging ; pathology ; Adolescent ; Adult ; Aged ; Aged, 80 and over ; Carcinoma, Squamous Cell ; diagnostic imaging ; pathology ; Diagnosis, Differential ; Female ; Humans ; Lung Neoplasms ; diagnostic imaging ; pathology ; Male ; Middle Aged ; Retrospective Studies ; Tomography, Spiral Computed ; methods ; Tuberculosis, Pulmonary ; diagnostic imaging ; pathology ; Young Adult

This is a retrospective study aimed at the clinical application of 64-slice computed tomography angiography (CTA) in evaluation the lumen before and after coronary artery stent implantation. We collected the coronary artery imaging data of 46 patients undergoing 64-slice CT before coronary artery stent implantation from July 2006 through May 2007; we also collected the data of 21 patients with 34 coronary artery stents in the same period to determine the diagnostic accuracy of CTA before and after coronary artery stent implantation. The results showed that, in 46 patients, 64-slice CT enabled the visualization of the entire coronary tree with diagnostic image quality. Sensitivity, specificity, and accuracy for the detection of stenosis > or = 50% were 92.11%, 95.64% and 94.97%, respectively. In 21 patients with 34 stents implanted, 23 (67.65%) stents showed no stenosis, 8 (23.53%) stents showed low degree of restenosis, and 3 (8.83%) stents showed high degree of restenosis. In conclusion, we can accurately evaluate the degree of stenosis of lumen before and after coronary artery stent implantation with the application of 64-slice CTA.
Adult ; Aged ; Angioplasty, Balloon, Coronary ; Coronary Angiography ; methods ; Coronary Artery Disease ; diagnostic imaging ; therapy ; Coronary Restenosis ; diagnosis ; diagnostic imaging ; Female ; Humans ; Male ; Middle Aged ; Retrospective Studies ; Sensitivity and Specificity ; Stents ; Tomography, Spiral Computed ; methods

This paper was objected to determine the relationship between MDCT features and anatomic-pathology of diseases in right thoracic-abdominal junctional region. We cut 3 cadavers transversely and another 3 vertically to observe the anatomy of thoracic-abdominal junctional zone. We scanned 69 patients with diseases in right thoracic-abdominal junctional zone by MDCT. The correlation between MDCT features of right thoracic-abdominal junctional region and the anatomic-pathology in this region was evaluated. We found results as that in cadaver sections, the right pulmonary ligament, which was below inferior pulmonary vein, attached the inferior lobe of right lung to the esophagus, that the coronary ligament, which interiorly extended from falciform ligament and laterally formed into right triangular ligament, contained two layers, and that the bare area of liver, which positioned between the two layers of coronary ligament, was directly next to diaphragm with no peritoneum covered. There were 50 cases with both pleural and ascitic fluid, while the pleural fluid was divided into anterior and posterior compartments by the right pulmonary ligament, whereas the ascitic fluid was limited in perihepatic space in majority. Among the 50 cases, 5 patients had lung cancer with diaphragmatic pleura, diaphragm and upper abdomen involved. 5 patients had right hepatic lobe cancer with subdiaphragmatic peritoneum, crura diaphragmatis and lower thoracic cavity involved. 1 patient had right adrenal carcinoma with phrenic metastasis. 8 patients had inflammation in right lower thorax and/or right upper abdomen. The spreads of these diseases include mainly direct invasion, blood and lymphatic spread routs in the region. Conclusion could be drawn that the MDCT features and distribution of right thoracic-abdominal junctional region diseases correlate with the anatomical characteristics in this region.
Abdominal Cavity ; anatomy & histology ; diagnostic imaging ; pathology ; Cadaver ; Diaphragm ; anatomy & histology ; diagnostic imaging ; pathology ; Humans ; Multidetector Computed Tomography ; methods ; Radiography, Thoracic ; Thoracic Cavity ; anatomy & histology ; pathology