ISSN 1004-4140
CN 11-3017/P

2016 Vol. 25, No. 4

Display Method:
CT Theory
Study of Liver Fat Content in Patients with Newlydiagnosed Type 2 Diabetes Mellitus on Chemical Shift MRI
GAO Xiang, YUAN Yan-wen, JIN Er-hu, ZHANG Jie, HONG Xu, YANG Zheng-han, MA Da-qing
2016, 25(4): 385-392. doi: 10.15953/j.1004-4140.2016.25.04.01
Objective: To explore liver fat content and correlative factors in patients with newly-diagnosed type 2 diabetes mellitus(T2DM). Methods: Data were obtained from 69 patients with T2DM(16 females, 53 males; aged 44.4 ± 12.9 years old) and 32 healthy volunteers(15 females, 17 males; aged 42.7 ± 9.6 years old). The technique of double-echo chemical shift gradient-echo magnetic resonance imaging was used to measure the fat content of each hepatic segment respectively. The fat fraction between two groups and among hepatic segments was compared, and its correlation with body weight, body mass index, waistline, hipline, waist hip ratio, visceral adiposity, superficial adiposity, fasting blood glucose, fasting insulin, fasting c-peptide, total cholesterol, triglyceride, high density lipoprotein and low density lipoprotein was analyzed. Results: There were significant differences in the fat fraction between healthy volunteers and T2DM group(t=5.402, P < 0.05). The fat fraction of hepatic segment Ⅰ to Ⅷ in T2DM patients was 18.67% ± 5.28%, 19.52% ± 4.22%, 19.37% ± 4.81%, 19.63% ± 3.67%, 19.39% ± 4.15%, 19.44% ± 4.18%, 19.67% ± 4.50% and 20.43% ± 4.38%, respectively, there was no significant difference among them(F=0.800, P > 0.05); the body weight(r=0.316), body mass index(r=0.302), waistline(r=0.291), hipline(r=0.279), superficial adiposity(r=0.310), fasting insulin(r=0.265) and fasting c-peptide(r=0.268) are positive correlation(P < 0.05) to the liver fat fraction, whereas the waist hip ratio(r=0.195), visceral adiposity(r=0.117), fasting blood glucose(r=-0.039), total cholesterol(r=-0.146), triglyceride(r=0.240), high density lipoprotein(r=0.012) and low density lipoprotein(r=-0.137) are irrelevant(P > 0.05) to the liver fat fraction. Conclusions: The liver fat content in newly-diagnosed patients with T2DM is higher than that in healthy people, and is positive correlation to the body weight, body mass index, waistline, hipline, superficial adiposity, fasting insulin and fasting c-peptide.
Computer Assisted Surgery and Personal Orthopaedy of Patient with Knee Varus and Valgus
HAO Yun, HE Jin-peng
2016, 25(4): 393-401. doi: 10.15953/j.1004-4140.2016.25.04.02
Purpose: To explore a novel method of accurate measurement of patient with knee varus and valgus though computer assistant and the value been evaluated. Method: 14 patients admitted from Sep, 2010 to Sep, 2013, included 16 knees, consisted of 10 varus knees and 6 valgus knees. With computer assisted, appropriate osteotomy site and angle were selected and operation method planned. After operation, HSS evaluation was done compared with those scores before operation. Result: All patients were followed up between 3 to 12 months, the varus and valgus angle were quite well corrected, and the lower limb power lines were rebuilt. HSS scores were elevated from 52.6 ± 13.1 to 86.2 ± 8.9, respectively. Only 1 patient found infected, and cured with antibiotics. Conclusion: It is a valuable method to help a surgeon to make an operation plan for patients with knee varus and valgus diseases.
Spectral CT
Evaluation of Urinary Calculi: A Comparison of CT Values between Spectrum CT and Conventional CT
FAN Bing, WANG Xiao-ying, QIU Jian-xing, GUO Xiao-chao, DONG Jian, GONG Kan
2016, 25(4): 403-408. doi: 10.15953/j.1004-4140.2016.25.04.03
Objective: To evaluate the difference of spectrum mixed energy(Quality Check) mode and conventional CT for the diagnosing of urinary calculi. Methods: Sixty-three urinary stones were obtained by endoscopic lithotripsy from the urology department of Peking university first hospital. Each calculi underwent the conventional CT scan and spectral imaging technique(Discovery CT750 HD; GE Healthcare) respectively and the scan parameters were consistent strictly. At the GE AW4.4 work station, the CT value of all the images were measured by an experienced radiologist. Paired t test and Pearson correlation analysis were used to compare differences between the two modes. Results: The average CT value of the 63 cases was 886 HU± 428 HU for conventional unenhanced CT mode, and 789 HU± 351 HU for Quality Check mode. The difference of CT value was statistically significant(t=6.90, P < 0.01). The CT value of Quality Check mode was correlated with conventional unenhanced CT mode(r=0.978, R2=0.957; P < 0.01). Conclusion: There is high correction between the two measurement modes, while the CT value of Quality Check mode is lower than that of conventional one. Quality Check mode probably can alternative the conventional CT scans in diagnosing urinary calculi.
Automatic Identification Method of Earthquake Event and Its Application in Nanling Portable Seismic Array
LIU Rong-ping, WANG You-xue, JIANG Chan-jun, NAI Zhen-long, XU Jin-rong, ZHANG Qi, CENG Cheng, WANG Xin-yu
2016, 25(4): 409-417. doi: 10.15953/j.1004-4140.2016.25.04.04
The identification of earthquake events is very important in seismic tomography. However, during searching earthquake event from the huge earthquake data base acquired by portable array, the traditional manual method of identifying earthquake events is very inefficient and time-consuming. This paper uses STA/LTA method to judge the existence of earthquake event preliminary, uses the Support Vector Machines and the multi-station joint inspection to improve the accuracy of earthquake event discrimination and anti-jamming capability, and then earthquake event can be identified from huge earthquake data bank. Finally, this technique is applied to the Nanling portable seismic array data, and the result shows that the method can determine earthquake events automatically, quickly and accurately, and then the event data can be used for phases identification further.
Application of the Electromagnetic CT in Karst Exploration of T1d in Wuhan
PENG Yao, DONG Yan-ping, FAN Yong-sheng, XU Lian-ze, ZHAO Xian-gang
2016, 25(4): 419-424. doi: 10.15953/j.1004-4140.2016.25.04.05
Abstract(512) PDF(12)
The electromagnetic CT is widely used in the Karst exploration. The statistical analysis of the Karst which developed in T1d, combining with drilling data, has been done in this paper. The apparent absorption coefficient of the Karst in this stratum has been determined, which is being used in the interpretation of the electromagnetic CT and being verified by the verification hole. The important issue of anomaly identification in electromagnetic CT has been solved in this study, which is able to provide important guidance for Karst exploration of T1d in Wuhan.
Pore-throat Characterization of Tight Oil Reservoir in the Lucaogou Formation, Jimusar Sag
ZHANG Tian-fu, FAN Guang-xu, LI Yu-wen, YU Chao-feng
2016, 25(4): 425-434. doi: 10.15953/j.1004-4140.2016.25.04.06
This paper discussed the pore-throat characteristics of Lucaogou Formation, Permian, Jimusar Sag, by Miro-CT, FIB-SEM, N2-Adsorption etc. The results indicated that Lucaogou Formation was tight oil reservoir with low to extra low permeability and its pores were falling into micro-nano scales and of various types, including intergranular pores, intercrystalline pores, dissolved pores, moldic pores, micro-fractures, interlayer fractures, and so on. The reservoir physical properties and pore structures were distinctive in different parts of Lucaogou Formation. Doloarenites in upper Tiandian have micro intergranular pores and dissolved pores. Calcareous siltstones in lower Tiandian formation held nano intergranular and intercrystalline pores with size of 0.05~0.1 μm. Calcareous ampelitic mustones in Feitiandian held intercrystalline pores, interlayer and micro fractures, size of fractures being 5~6 μm approximately.
Experimental Detection of Ancient Tomb in Xiongjiazhong Using Electrical Resistivity Tomography
ZHOU Jian-guo, ZHU Tao, GONG Yan
2016, 25(4): 435-443. doi: 10.15953/j.1004-4140.2016.25.04.07
In order to reasonably arrange the subsequent archaeological excavation of ancient tombs in Xiongjiazhong, it needs to geophysically detect the location and buried depth of chamber of its main and accompany mounds. Because electrical resistivity tomography has the advantage of non-destruction, this technique is used to experimentally detect the main and accompany mounds of Xiongjiazhong ancient tomb in this paper. Two measuring lines, in which one was along NS direction and the other along EW direction, were arranged to control the main and accompany mounds, respectively, in this detection. Their locations and sizes were estimated based on the reconstructed resistivity images, which provided the basic parameters for the subsequent archaeological excavation of ancient tombs ß.
Medical CT
320-Detector Row CT Narrow Acquisition Window in Single Cardiac Cycle for CTCA: Clinical Evaluation
XING Gui-rong, BAO Li-li, LIU Ai-shi
2016, 25(4): 445-452. doi: 10.15953/j.1004-4140.2016.25.04.08
Objective: To evaluate the value of narrow acquisition acquisition CTCA by single cardiac cycle using 320-detector row CT. Methods: 80 patients(HR ≤ 65 bpm, HRv ≤ 5 bpm) were enrolled from september 2015 to January 2016 in this study. All of patients were divided into two groups. Group A included 40 patients with acquisition phase 70%~80% in R-R interval and Group B with acquisition phase 30%~80% in R-R interval. Both two groups with tube voltage 100 k V and tube current tailored to BMI(300~580 mA). Two groups were evaluated by radiation dose and image quality(all coronary artery segments scaleand percentage of assessable, aorta attenuation). A P value below 0.05 was considered to be statistically significant. Results: All patients include group A and B successfully underwent single cardiac cycle CTCA. The mean effective dose for group A was 2.02 mSv ± 0.78 mSv; this represents a 46% reduction as compared with that group B(4.35 mSv ± 0.85 mSv,t=-12.474,P=0.000). The mean image quality score was 3.61 ± 0.53 obtained with Group A versus 3.71 ± 0.48 obtained with Group B(Z=-3.074,P=0.002). The difference of the percentage of assessable coronary artery segments in both groups was not statistically significant(χ2=0.215,P=0.643). The difference of aorta attenuation in both groups was not statistically significant(t=-1.132,P=0.261). Conclusions: narrow acquisition acquisition CTCA may reduce the radiation dose keeping image quality assessable in patients with low HR(≤ 65 bpm) and HRv(≤ 5 bpm).
Clinical Utility Study of CT Perfusion and CT Angiography with 64-Slice Multi-CT for Acute Ischemic Brain Stroke
LIANG Li-hua, LIN Jing-xing, CHEN Zhi-jun, CHEN Yao-qiang, WU Ju-fang
2016, 25(4): 453-461. doi: 10.15953/j.1004-4140.2016.25.04.09
Objective: To study the clinical applicative value of brain CT perfusion joint head and neck CT angiography with 64-slice multi-detectors CT for acute ischemic brain stroke. Methods: 50 cases of maybe acute cerebral infarction patients were collected to CTA and CTP examination within 12 hours after onset, and related clinical treatment in time. Head CT or MRI review were took 30 days later. Results: CBF, CBV of Infarct and contralateral corresponding area was significantly statistically different(P < 0.01), CBF, TTP of penumbra and contralateral corresponding area was significantly statistically different(P < 0.01), but CBV with no statistically significantly difference(P > 0.05). CTP diagnosis penumbra, compared with the results of the review, the difference was not statistically significant(P > 0.05), with a sensitivity of 95% and a specificity of 69%. Most plaque were found in the carotid bifurcation(21%), intracranial internal carotid artery(17%) and middle cerebral artery(19%), 52% of vulnerable plaque. Compared the stenosis between ipsilateral and contralateral feeding artery in patients with anterior circulation CTP abnormalities, the difference was statistically significant(P=0.005), the difference of plaque type and vulnerable plaque was statistically significant(P < 0.001). Conclusions: CTP can visually distinguish infarct and penumbra. Higher accuracy was found with method "CBV-TTP does not match, and delay TTP > 6 s" to diagnose penumbra, Moderate or more stenosis, soft plaques, mixed plaques and vulnerable plaques in feeding artery were positively correlated with stroke. CTP and CTA have a high application value for acute ischemic brain stroke.
Analysis of Imaging Findings of Hepatic Multi-locular Ring-enhancement Lesions
WANG Shuai, SHA Jun-ping, DING Feng, LI Dong, HU Chun-hong
2016, 25(4): 463-470. doi: 10.15953/j.1004-4140.2016.25.04.10
Objective: To study manifestations of hepatic multilocular and ring-enhancement lesions and differential diagnosis of liver abscess, intrahepatic cholangiocarcinoma and liver metastasis. Methods: Imaging findings of 31 cases were retrospectively analyzed, including liver abscess 15 cases, intrahepatic cholangiocarcinoma 7 cases and liver metastasis 9 cases. 13 cases carry the CT plain scan and three phases enhanced examination of upper abdominal. 7 cases underwent MRI plain scan and LAVA multiphase scanning. 11 patients underwent CT and MRI examination meanwhile. Results: There was a statistical difference among the three multilocular and ring-enhancement lesions for the enhancement signs of the morphology of ring wall and septum. The ring-wall and septum thickness uniformity, complete enhancement(P < 0.05), and the appears mass diminution sign(P < 0.05).The ring enhancement in a centripetal filling(P < 0.05) or retraction of liver capsule(P < 0.05) and expansion of bile duct wall local thickening, the findings is helpful to diagnosis cholangiocarcinoma. The ring-wall irregular interrupt or enhancing wall nodule, it has great value for diagnosis for liver metastasis. Conclusions: The three lesions have their imaging features, combine with CT and MRI have a high value for differentia diagnosis of the three lesions.
CT Double Phase Enhanced Scan to Thyroid Adenoma and Nodular Thyroid in Differential Diagnosis Value
XUE Feng, SUN Dan, LI Ma-xuan-xuan, QIAO Zhong-yun, DAN Hua
2016, 25(4): 471-476. doi: 10.15953/j.1004-4140.2016.25.04.11
Objective: To investigate CT double phase enhanced scan in the diagnosis of thyroid adenoma and nodular goiter. Methods: A retrospective comparison of 25 cases handled postoperative pathology confirmed thyroid adenoma and nodular goiter patients with CT scan and enhanced scan results, and analyzed. Results: A total of 25 patients took 35 thyroid nodule, 18 thyroid adenoma and nodular goiter 17 pieces. Adenoma group scan CT value of 30~60 HU, nodular goiter group scan CT value of 25~55 HU, both difference is not obvious. Adenoma group enhanced scanning CT value 120~160 HU, nodular goiter set 60~100 HU, CT scan, there were significant differences between the two. Conclusion: CT double phase enhancement of thyroid adenoma and thyroid provide basis for the differential diagnosis of nodular goiter.
MSCT Evaluation of Myocardial Bridge and Its Relationship with Atherosclerosis
CUI Run-he, LIU Hui, XING Gui-rong
2016, 25(4): 477-484. doi: 10.15953/j.1004-4140.2016.25.04.12
Objective: To explore the mural coronary artery in diastole late, according to law, and analyze the mural coronary artery in the middle of the early diastole, the degree of stenosis and MB coronary artery overall form as well as the correlation between the occurrence of atherosclerosis. Materials and methods: 754 cases of clinical suspected coronary heart disease(CHD) patients with coronary artery CT imaging, the independent workstation multilane reconstruction(MPR, CPR) blood vessels and myocardial spatial relationships, confirm the completeness of the myocardial bridge, in the judgment and the morphology of mural coronary artery: observation on the MPR like coronary take line all the way, and grouping, measuring wall in the reorganization of intracavitary imaging of coronary artery stenosis degree, and t test between the two groups. According to MCA proximal presence of plaque formation is divided into patches and plaques group, the mural coronary artery stenosis degree respectively independent sample t test between the two groups. The plaque group and the probability of occurrence of plaque composition Angle give four table chi-square test. Results: In a total of 754 subjects found in 81 cases of complete myocardial bridge. According to the MB thickness, can be divided into two groups: > 2 mm group and ≤ 2 mm group. t test results between the two groups have statistically significant differences(P < 0.05). The MB coronary artery course circuity, direction normal diastolic MCA stenosis degree is serious. Plaque and plaque group t test results between the two groups have statistically significant differences(P < 0.05). Plaque group and the Angle of circuitous probability table chi-square four grids has statistically significant difference(P < 0.05). Patients in 81 cases of ECG, analysis of its static circuity-angulation group electrocardiogram ST-T period of change and the rate of angina pectoris occurred was obviously higher than that of normal group. Conclusion: The myocardial bridge could cause the development of atherosclerotic lesions. Diastolic MCA stenosis degree and load MB proximal coronary artery overall direction and presence of atherosclerotic plaques, circuity-angulation diastolic stenosis degree is greater than the normal group. Proximal have plaque diastolic more narrow than no plaque group. MCA proximal plaques, as a result of atherosclerosis, are more likely to happen as Angle circuity. Circuity angulation group client static ECG ST-T segment changes as well as the incidence of angina pectoris were higher than that of smooth arc group.
The Application of X-ray and 3D CT Imaging in Evaluation of Tibial Plateau Fracture
SUN Guang-jiang, YAO Xiao-sheng, LI Hong-jiu, YANG Dong-xiang
2016, 25(4): 485-491. doi: 10.15953/j.1004-4140.2016.25.04.13
Abstract(1474) PDF(7)
Objective: To make comparison between the reliability and validity of both X-ray and 3D(three-dimensional) CT imaging inevaluation of Tibial plateau fracture, and to discuss the application of the X-ray and 3D CT examination. Methods: Analyzed retrospectively 32 cases of Tibial plateau fracture who were hospitalized from January 2015 to January 2016. X-ray and 3D CT imaging were respectively used to judge the fracture type and characteristics, Analyze the standard validity of the facture judgment results(the operation record description was used as the gold standard). The differences between the X-ray and 3D CT judgment results and the gold standard were compared by Mc Nemar test. Results: The diagnosis of external column with 3D CT was significantly higher than that of X-ray results(P=0.031). Conclusion: The 3D CT examination can increase the reliability and accuracy of the evaluation of tibial plateau fracture, and is helpful to guide the diagnosis and the determination of operation schedule.
CT Diagnosis of Solitary Pulmonary Tuberculoma
XIE Zhang-nong, YANG Chun-yang, HUANG Ze-guang
2016, 25(4): 493-498. doi: 10.15953/j.1004-4140.2016.25.04.14
Objective: To analyse the CT finding of solitary pulmonary tuberculoma. Methods: CT data of 26 cases proved of SPT by pathology were retrospectively analyzed. All patients were underwent chest CT scan.8 cases of those were performed by enhanced scan together. Results: Of 26 lesions, there were 13 lesions distributed in left lung and right lung respectively.18 lesions were distributed in the upper lung of apical posterior segment or below lung of dorsal lung segment.8 lesions were distributedin other segments. The long diameters of these lesions were between 3-54 mm. We got definite diagnosis of pulm-onary tuberculoma of 7 cases(27%), misdiagnosed 15 cases(58%) as per-ipheral lung cancer, and misdiagnosed 3 cases as inflammatory pseudot-umor, and misdiagnosed 1 case as other lesion. Conclusion: Solitary pul-monary tuberculoma could misdiagnose as lung cancer or other lesions. CT-guided percutaneous lung biopsy is an effective method for diagno-sis of pulmonary tuberculoma.
The Application of Low Tube Voltage and Low Volume Contrast Agent Protocol in CT Pulmonary Angiography
FU Chuan-ming, XU Lin, CHEN Lun-gang, CHEN Ping-you, CHEN Wen, YANG Tao
2016, 25(4): 499-506. doi: 10.15953/j.1004-4140.2016.25.04.15
Objective: To evaluate the image quality, radiation dose and clinical application value of the "double low"(low tube voltage and low iodine) technology in the CT pulmonary angiography(CTPA). Method: The patients(n=105) with clinicaliy suspected as pulmonary embolism(PAE), were randomly divided into group A, B and C(each n=35), prospectively. Group A: the tube voltage was 120 kVp, and the volume of contrast agent was 40 mL(Iodine consentration: 350 mg I/mL), flow rate 4 mL/s; Group B: the tube voltage was 100 kVp, and the volume of contrast agent was 35 mL(Iodine consentration: 300 mg I/mL), flow rate 3.5 mL/s; Group C: the tube voltage was 80 kVp, and the volume of contrast agent was 30 mL(Iodine consentration: 270 mg I/mL), flow rate 3 mL/s.Group A was using filter back-projection algorithm(FBP) and both group B and C was using the technology of ASIR for reconstruction, and all groups was opening Attenuation-based online tube current modulation(ATCM) technology. Recording each patient's CTA scan time, the volume of contrast agent, CT dose volume index(CTDIvol) and dose length product(DLP), and calculating the effective dose(ED), type specific dose estimation(SSDE) value and the amount of iodine.To measure the CT values of pulmonary artery trunk, left and right pulmonary arteries and subsegmental Pulmonary in the axial image.To compare the radiation dose, the amount of iodine,and the subjective and objective evaluation index of the image quality by Using Kruskal-Wallis H test. Results: The differences of the measured average CT values of the main pulmonary artery, left and right pulmonary arteries and subsegmental pulmonary artery between the three groups were not statistically significant(P > 0.05); The differences of background noise, SNR, CNR and subjective evaluation between the 3 groups' images were also not statistically significant(P > 0.05). Compared with group A, the ED of group B and C were decreased by 38.09% and 51.99% respectively, and SSDE were decreased by 37.96% and 48.39% respectively. The amount of iodine in the A group was higher than that 25% in the B group and 42.14% in the C group, Conclusion: The application of the tube voltage(80 kVp), the volume of contrast agent(30 mL) and the iodine concentration(300 mg I/mL) and flow rate 3mL/s in CT pulmonary angiography is feasible, not only can the image quality meet the Clinical Diagnosis, but also reduce the radiation dose and the amount of iodine.