Objective To compare radiation dose and image quality of prospectively ECG-triggered sequence acquisition mode and Flash(high-pitch spiral acquisition)mode in DSCT angiography of children with congenital heart disease.Methods Sixty children with clinically suspected congenital heart disease and undertook DSCT prospectively ECG-triggered scan were enrolled in the study and randomly divided into two groups.The Flash mode and prospective sequence scanning mode were applied in group A and B,respectively.The CT dose index(CTDIvol),dose length product(DLP),effective dose(E),and image quality were compared between two groups.Refered to surgery or cardiac angiography(DSA),the diagnostic coincidence rates were compared between two groups.Results The CTDIvol in group A and B was(0.32 ± 0.10)and(1.40 ± 0.43)mGy(t=13.32,P＜0.05),respectively.The DLP was(6.46 ±1.92)and(17.91 ±4.80)mGy·cm(t=7.97,P＜0.05).E was(0.19±0.05)and(0.45±0.12)mSv (t=16.64,P＜0.05).The image quality score in group A(4.03 ± 1.15)was higher than that in group B (3.13 ± 1.38)(t=3.55,P＜0.05).The total diagnostic coincidence rates were 100％(A)and 93％ (B).But the deformity diagnostic coincidence rates in group A(91％)was higher than that in group B (75％)(x2=7.72,P＜0.05).Conclusions In DSCT diagnosis of congenital heart disease in children,using flash scan mode can reveal more cardiac deformities than using prospective sequence scanning mode,and could reduce the radiation dose.

Objective To evaluate the radiation dose and image quality of MinDose techniques in dual-source CT coronary artery angiography.Methods 120 consecutive patients undergoing cardiac CT scans were randomly assigned into 2 groups: Group A1 with the tube current reduced to 20% of the normal tube current outside the pulsing window,and Group A2 with the tube current reduced to 4% of the normal tube current outside the pulsing window (MinDose).The image quality,noise,volume CT dose index (CTDIvol),and effective dose (E) of these two groups were evaluated.Results The mean score of imaging quality of Group A1 was (4.3 ± 0.3 ),not significantly different from that of Group A2 [(4.5 ±0.4),t=0.16,P＞0.05].The value of CTDIvol of Group A1 was (40.2 ±9.6) mGy,significantly higher than that of Group A2 [( 36.4 ± 9.1 ) mGy,t = 3.2,P ＜ 0.05].The E value of Group A1 was (9.1± 2.2) mSv ,significantly higher than that of A2 [( 8.1 ± 1.9) mSv,t = 2.7,P ＜ 0.05].Conclusion Application of the MinDose technique not only reduces the radiation dose to the patient,but also meets the requirement of diagnosis.

Objective To investigate the possibility to create versatile system recovery disc for PACS workstation using the software Ghost 11. Methods Firstly, PACS and Windows software was installed into a PACS workstation. Secondly, S&R&S V9.7 1112F intelligent system -packaging tool and DllCacheManager_V1.6 Dllcache backup -restore tool were used to package the system. Finally, Ghost 11 was adopted to produce mirror image of the system. Results The image could recover system easily. Conclusion The system-recovery disc created by Ghost11 can significantly minimized the workload when the PACS workstation runs into error and improves the maintenance efficiency.

Objective To investigate the advantages of BLADE technique in MR T2WI/TSE abdomen scanning. Methods 36 cases, which had obvious motion defects with conventional T2WI/TSE axial abdomen scanning because of psychology or disease, performed T2WI/BLADE/TSE scan with the same regions. Then the image quality was compared, and amendment of motion defects was reviewed. The equipment was SIEMENCE 3.0T scanner and phased-array coil. Results Motion defects of all images with T2WI/BLADE/TSE were attenuated with different degree compared with T2WI/TSE. All images with T2WI/BLADE/TSE satisfied the diagnostic demand. Conclusion The BLADE technique in abdomen scanning solves the difficult problem of impossible MR scan with uneven breath and trembling patients because of psychology or disease, and obtains good diagnostic imaging.

Objective To study how to finish radiography work satisfactorily under emergency situations. Methods Analyses and sum-up were performed from three aspects, including X -ray diagnostic vehicle, radiography and PTSD. Results The vehicle-mounted X-ray machine was kept good state during high strength utilization. 620 cases from the disaster area were examined and the diagnosing quality was better than usual. Conclusion Such aspects are very important for emergency application of vehicle-mounted X-ray machine as the daily maintenance of the machine, high technical level and proper mental intervention.

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 clinical applications of SIVP detecting hepatocarcinoma in cirrhosis.Methods 40 cases of cirrhosis combined with hepatocarcinoma diagnosed by operation and pathology were collected.Control group were scaned with conventional technique,experimental group were scaned with SIVP.Results Only 5 cases catched the optimal scan timing in control group,the accuracy of diagnosis in hepatocarcinoma was 70%;All the cases found the optimal scan timing in experimental group,the detectable rate of hepatocarcinoma was 95%.Conclusion SIVP can find out the optimal timing,which greatly improved accuracy of diagnosing hepatocarcinoma in cirrhosis.

Objective To analysis the CT features in 7cases of rare adrenal interstitial tissue tumors.Methods 7 cases of rare adrenal interstitial tissue tumors were verified with operation and histology.2 cases were cyst and 2 were lipoma,neurofibroma,neurilemoma and mesenchymoma was 1 case,respctively.Results Adrenal cyst and lipoma appered the density of water and fat.neurofibroma and neuriemoma were slightly low density mass,without enhancement.There were cystic lesion in neurilemoma.Mesenchymoma had slight or moderate enhancement.Conclusion It is difficult or impossible to distinguish nuerofibroma,neurilemoma or mesenchymoma from non-function adenoma or pheochromocytoma except adrenal cyst and lipoma.