In multilayer spiral CT heart and coronary artery imaging, image data are acquired by ECG gating technology when heart beats slowest so as to restrain pulsation pseudo-image. ECG gating technology includes foresight ECG gating and retrospective ECG gating. The principle, methods and mutual image reconstruction are introduced in this paper.

Objective To investigate the effects of hyperbaric oxygenation(HBO)therapy on serum cytokines and depression in post-stroke depression(PSD)and to study it's clinical implications.Methods Sixty patients with PSD were divided into two groups.Patients in routine treatment group(RT group)were treated with routine clinical treatment,whereas those in HBO group were treated with HBO therapy in addition to routine clinical treatment.The serum cytokines of tumor necrosis factor-α(TNF-α)and interleukin-1β(IL-1β)were measured by enzyme-linked immunosorbent assay(ELISA)before and after 30 days of treatment.All the patients were evaluated with Hamilton depression scale(HAMD),Chinese stroke scale(CSS)and Barthel index(BI).The evaluations were carried out at the 0 and 30 d.Results Before treatment,the concentrations of TNF-α and IL-1β in patients with PSD were significantly higher than those in patients with cerebral infarction without depression(P＜0.01),and the serum levels of TNF-α and IL-1β in those with serious depression were higher than those with moderate and mild depression(P＜0.01),and that in moderate depression patients were higher than that in mild depression patients{P＜0.01).At the 30th d post-treatment,those parameters all decreased significantly in RT group and HBO group(P＜0.01,P＜0.05).Moreover,those parameters were lower in HBO group than those in RT group(P＜0.01),and HAMD,CSS and BI scores in HBO group were significantly better than that in RT group(P＜0.05,P＜0.01).Conclusions Serum cytokines levels increased significantly in patients with PSD and were associated with the severity of depression.Serum cytokines might played an important role in pathogenesis of PSD.HBO therapy could help decrease the levels of TNF-α and IL-1β.HBO might exert therapeutic effect by reducing secondary the inflammatory injury in acute cerebral infarction.

The construction of 64-slice-dual-source computed tomography(DSCT) is introduced.Its imaging principle and clinical application are put forward.DSCT has special advantages in diagnosing coronary stricture.The principles of DSCT and energy subtraction imaging are expatiated in detail.DSCT has great value in clinical research and application.

Objective To evaluate the clinical value of ulinastatin on the treatment of systemic inflammatory response syndrome in severe acute panereatitis. Method Eighty-four patients with severe a-cute pancreatitis were randomly divided into two groups. In the treatment group (42 cases),on the base of routine treatment, ulinastatin was administered intravenously for seven days after hospitalization, while in the control group only routine treatment was given (42 cases) to. Inflammatory factors in serum, the change of liver function and renal function were measured in two groups before and after the treatment, and the clinical efficacy were observed. Results There was significant difference, in the serum level of tumor necrosis factor-α, interleukin-1, interleukin-6, alanine aminotransferase, aspartate aminotransferase, blood urea nitrogen and creatinine on the 7th day between two groups (P < 0.05 or < 0.01 ) ,there were significant differences in the incidence of complications, hospitalization time, incidence of multi-organ failure between two groups [14.3%(6/42) vs 38.1%(16/42), (29.4 ± 1.5)d vs (34.4 ± 1.8)d, 28.6%(12/42) vs 47.6%(20/42), P<0.01 or <0.05 ]. Conclusions Ulinastatin can suppress the secretion and release of some inflammatory factors, protect the important viscera functions and reduce the incidence of complications, and it has favorable clinical efficacy.

Objective To study the effect of image quality and radiation dose by using Z -axis automatic tube current modulation(ATCM),as well as the application of automatic tube current modulation technology.Methods A control group consisting of 25 patients underwent cervical MDCT with fixed-current technique(100-220mA).Of two study groups of 25 patients,one underwent cervical MDCT using z-axis ATCM with the noise index of NI10 and tube current intensity of 80-480 mA,and the other with the noise index of NI12.5 and tube current intensity of 80-369 mA.The noise and mean tube current-time products(mAs) were recorded.Two radiologists evaluated images for diagnostic acceptability.Results All CT examinations of study and control groups were diagnostically acceptable,though objective noise was different with z-axis ATCM than with fixed current.ATCM resulted in significant radiation dose reduction(NI10,94.8?17.9 mAs;NI12.5,74.8? 18.3 mAs),when compared with the fixed current(130.4?43.1 mAs).Conclusion Z-axis Automatic mA technique has no significant change in image quality when compared with the fixed mA technique,but the radiation dose is decreased by 27%(NI10) and 43%(NI12.5),for MDCT evaluation of neck.NI has to be selected on the basis of the tissue,lesion size and nature.

Objective With the increasing of the CT examination, the dose of x-ray has been brought to public attention. For the sake of making the MDCT technology better applied, available optimal technology has to be used to reduce the x-ray dose to the patients. Methods Many optimal technologies were involved in, such as ECG modulation, cardiac bowtie, 3D dose modulation, compact geometry design, electron collector and speed 4D CARE dose. Results The result of the research showed that the dose of scanning x-ray of CT could be decreased sharply by using optimal technologies. The Q2 values was the standard which could well evaluate the quality of the CT′s images and the dose of x-ray. Conclusion The quality of images and the dose of x-ray can′t be separated, which must be quoted together.

Objective To introduce the techniques and clinical application of coronary arterial calcification measurements by using the multi-slice CT (MSCT). Methods The recent literature on the coronary artery calcium scoring with MSCT were reviewed. The data acquisition, image reconstruction, quantification methods in assessment of calcium and usefulness of calcium scoring in coronary artery disease were investigated. Results MSCT with nearly isotropic volumetric imaging data, subsecond rotation and retrospective electrocardiographic gating could provide better input data for quantification of coronary arterial calcium volume. Conclusion MSCT allows more precise and repeated measurement of coronary arterial calcification with low interexamination variability.

Objective To evaluate the clinical application of the auto trigger technique with dual-source CT in cerebral and cervical vessel. Methods 35 patients were randomly divided into three groups, taking triggered threshold as 20HU,50HU and 70HU respectively, CT-values in segments of left middle cerebral artery, superior sagittal sinus, left common carotid artery adjacent to the fourth cervical vertebrate and internal jugular vein by injection at antecubital vein were all measured. Results The discrepancy of peak in artery among groups was not statistically different. It was statistically different in the same segments of vein. Conclusion CTA of cerebral and carotid arteries with the dual-source CT triggered technique can be clearly showed with 20HU as triggered threshold.

Objective To study the scan parameter of spiral CT angiography in aortic dissection.Methods 34 cases with aortic dissection successively underwent SCTA were studied retrospectively.The CT scan parameters,methods of posteriorimage treating were reviewed and analysed one by one.Results In 34 cases,32 cases were diagnosed as aortic dissection and classified correctly,in accordance with the result of operation and DSA,the quality of image was satisfied and the rate of success at least above 88.9%.The use of main scan parameters:(1)the ascend aortic dissection:slice thickness 4 mm,reconstruction interval 2 mm,pitch 1.25;tube current 175 mA;(2)involed in ascend,arch,descend and throacic aorta dissection:slice thickness 5 mm,reconstruction interval 2～3 mm,pitch 1.5;tube current 150 mA;(3)involved in abdominal aortic dissection:slice thickness 6～8 mm,reconstruction interval 2～3 mm,pitch 1.5 or 1.75;tube current 125 mA.The tube voltage all were 120 kV,the dosage of contrast media was 90～100 ml;the delayed scan time was choiced 20 second in throacic aortic and 25 second in abdominal aortic.The posterior image methods main used MPR,SSD,MIP and VR. Conclusion To set a sensible scaning plan,choose and match scan parameters properly according to the scaning length,can avoid the shortage of restrain SCTA scaning length and get satisfied image.

Objective To study the risk factors of periventricular-intraventricular hemorrhage (PIVH) in extremely low birth weight infants(ELBWI). Methods A retrospective study was performed in 41 ELBWI hospitalized between January 2001 and August 2008. Univariate analysis and Logistic regression analysis were performed to detect the risk factors of PIVH. Results Of 41ELBWI, twenty-three suffered from PIVH with the incidence of 56.1%. Univariate analysis revealed that,in PIVH group,gestational age,mean blood pressure and the minimum values of blood pressure were lower than non-PIVH group[ ( 27.1 ± 1.9 ) weeks vs ( 28. 7 ± 1.6) weeks, t = 2. 834, P ＜ 0. 05 ;(28.9±4.8) mm Hg vs (33.1±4.9) mm Hg, t=-2.747,P＜0. 05; (24.4±4.3) mm Hg vs (31.4 ± 6.6) mm Hg,t= -3. 863, P＜0. 05], while blood pressure fluctuation and the highest values of PaCO2 during the first week of life were higher[(19.0 ± 5.2) mm Hg vs (13.7 ± 4. 8) mm Hg;(60. 2± 19. 4) mm Hg vs (49.5±12.1) mm Hg] (t= 3. 310 and 2. 166, P＜0. 05), the incidence of administration of pulmonary surfactant, neonatal respiratory distress syndrome, shock, hypotension before 4 days of age, hyperglycemia and mechanical ventilation therapy were higher[73. 9 % (17/23) vs 27. 8%(5/18), 60. 9%(14/23) vs 27.8%(5/18),52. 2%(12/23) vs 5.5%(1/18),73. 9%(17/23) vs 33.3%(6/18) ,78. 3%(18/23) vs 44. 5%(8/18),87. 0% (20/23) vs 44. 5% (8/18)]( all P＜0.05).Multivariate Logistic analysis revealed that blood pressure fluctuation (OR = 1. 260, 95% CI: 1. 009-1. 572, P = 0. 041 ) and lowest mean blood pressure(OR = 0. 805,95 % CI: 0. 672-0. 965, P = 0. 019)were risk factors of PIVH. Among twenty-eight ELBWI received mechanical ventilation, only peakinspiratory pressure(OR=- 2. 086,95% CI: 1. 140-3. 819, P= 0. 017) was the risk factor of PIVH by Logistic analysis. Conclusions Low blood pressure and blood pressure fluctuation may be risk factors of PIVH in ELBWI. The high values of peak inspiratory pressure is a risk factor of ELBWI with mechanical ventilation.