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1.
Chinese Journal of Radiology ; (12): 811-816, 2021.
Article in Chinese | WPRIM | ID: wpr-910240

ABSTRACT

Objective:To evaluate the effect of deep learning based on DWI and fluid attenuated inversion recovery (FLAIR) to construct a prediction model of the onset time in acute stroke.Methods:A total of 324 cases of acute stroke with clear onset time, from January 2017 to May 2020 in Nanjing First Hospital, were retrospectively enrolled and analyzed. The patients were divided into a training set of 226 patients and a test set of 98 patients according to the complete randomization method using a 7∶3 ratio, and the patients were divided into ≤ 4.5 h and >4.5 h according to symptom onset time in each group. The acute infarction areas on DWI and the corresponding high signal area on FLAIR were manually outlined by physician. Using the InceptionV3 model as the basic model for image features extraction, the deep learning prediction model based on single sequence (DWI, FLAIR) and multi sequences (DWI+FLAIR) were established and verified. Then the area under curve (AUC), accuracy of human readings, single sequence model and multi sequence model in predicting the acute stroke onset time from imaging were compared.Results:DWI-FLAIR mismatch was found in 94 cases (94/207) of patients with symptom onset time from imaging ≤ 4.5 h, while in 28 cases (28/117) of patients with symptom onset time from imaging >4.5 h. ROC analysis showed that the AUC of DWI-FLAIR mismatch in predicting acute stroke onset time from imaging was 0.607, and the accuracy was 60.2%. The prediction model of deep learning based on single sequence showed that the AUC of FLAIR was 0.761 and the accuracy was 71.4%; the AUC of DWI was 0.836 and the accuracy was 81.6%. The AUC of predicting stroke onset time based on the multi-sequence (DWI+FLAIR) deep learning model was 0.852, which was significantly better than that of manual identification ( Z = 0.617, P = 0.002), FLAIR sequence deep learning model ( Z = 2.133, P = 0.006) and DWI sequence deep learning model ( Z = 1.846, P = 0.012). Conclusion:The deep learning model based on DWI and FLAIR is superior to human readings in predicting acute stroke onset time from imaging, which could provide guidance for intravenous thrombolytic therapy for acute stroke patients with unknown onset time.

2.
Article in Chinese | WPRIM | ID: wpr-907351

ABSTRACT

Intracranial atherosclerotic lesions are a common cause of ischemic stroke. Hemodynamics plays an important role in the formation and development of atherosclerosis and the risk assessment of clinical ischemic stroke events. As an evaluation method of cerebral hemodynamics, computational fluid dynamics can intuitively obtain hemodynamic parameters and provide valuable information for clinical diagnosis and treatment. This article reviews the application progress of computational fluid dynamics in evaluating peripheral hemodynamics of intracranial atherosclerotic lesions.

3.
Article | WPRIM | ID: wpr-833541

ABSTRACT

Objective@#To evaluate the performance of a convolutional neural network (CNN) model that can automatically detect and classify rib fractures, and output structured reports from computed tomography (CT) images. @*Materials and Methods@#This study included 1079 patients (median age, 55 years; men, 718) from three hospitals, between January 2011 and January 2019, who were divided into a monocentric training set (n = 876; median age, 55 years; men, 582), five multicenter/multiparameter validation sets (n = 173; median age, 59 years; men, 118) with different slice thicknesses and image pixels, and a normal control set (n = 30; median age, 53 years; men, 18). Three classifications (fresh, healing, and old fracture) combined with fracture location (corresponding CT layers) were detected automatically and delivered in a structured report. Precision, recall, and F1-score were selected as metrics to measure the optimum CNN model. Detection/diagnosis time, precision, and sensitivity were employed to compare the diagnostic efficiency of the structured report and that of experienced radiologists. @*Results@#A total of 25054 annotations (fresh fracture, 10089; healing fracture, 10922; old fracture, 4043) were labelled for training (18584) and validation (6470). The detection efficiency was higher for fresh fractures and healing fractures than for old fractures (F1-scores, 0.849, 0.856, 0.770, respectively, p = 0.023 for each), and the robustness of the model was good in the five multicenter/multiparameter validation sets (all mean F1-scores > 0.8 except validation set 5 [512 x 512 pixels; F1-score = 0.757]). The precision of the five radiologists improved from 80.3% to 91.1%, and the sensitivity increased from 62.4% to 86.3% with artificial intelligence-assisted diagnosis. On average, the diagnosis time of the radiologists was reduced by 73.9 seconds. @*Conclusion@#Our CNN model for automatic rib fracture detection could assist radiologists in improving diagnostic efficiency, reducing diagnosis time and radiologists’ workload.

4.
Article in Chinese | WPRIM | ID: wpr-745452

ABSTRACT

Objective To evaluate the combined application of the maximum standardized uptake value (SUVmax) of 68Ga-N,N'-bis (2-hydroxy-5-(carboxyethyl) benzyl) ethylenediamine-N,N'-diacetic acid (HBED-CC)-(Ahx) Lys-CO-Glu (PSMA-11) PET/CT imaging and the apparent diffusion coefficient (ADC) value of MRI in the differential diagnosis of prostate cancer (PCa).Methods Seventy untreated patients (age:(68.3± 12.1) years) with suspected PCa between December 2016 and April 2018 were prospectively studied.All patients underwent PET/CT and MRI examinations.The SUVmax and average ADC value were measured as diagnostic parameters,and the SUVmax/ADC ratio was calculated.The sensitivity and specificity of the 3 parameters were calculated by receiver operating characteristic (ROC) curve analysis.Results Of the 70 patients,31 were pathologically diagnosed as benign diseases and 39 were as PCa.The diagnostic sensitivity and specificity of average ADC value for PCa were 81% and 72%,respectively,with a threshold value of 1.08× 10-3 mm2/s (b=1 000 s/mm2).The diagnostic sensitivity and specificity of SUVmax were 82% and 71% for PCa with a critical value of 7.69,and those were 72% and 93% with SUVmax/ADC ratio of 11.87.Conclusion The combination of 68Ga-PSMA-11 PET/CT and MRI can improve the diagnostic specificity for PCa,and the SUVmax/ADC ratio is a valuable differential diagnostic index.

5.
Article in Chinese | WPRIM | ID: wpr-693147

ABSTRACT

Objective To investigate the feasibility and application value of the benign and malignant classificational methods of renal occupying CT images based on convolutional neural networks (CNN). Methods An image omics method that can automatically learn the image features and classify CT images was used. Firstly, the CNN model obtained by large-scale natural image training was used to migrate the characteristics of the renal occupancy lesions CT images, and then the fine-tuning of the full connection layer was used to realize the benign and malignant classification of the images. Results The evaluation indexes of the VGG19 model were lower than ResNet50 and Inception V3, and the training result showed obvious overfitting. The accuracy, sensitivity and negative prediction values of the Inception V3 model was 93.8%, 99.5% and 99.1%, respectively, which were higher than that of the ResNet50 model. Conclusions The benign and malignant classification of renal occupancy lesions CT images using CNN is a reasonable and feasible method, and the fine-tuned Inception V3 model has a better classification performance.

6.
Article in Chinese | WPRIM | ID: wpr-692966

ABSTRACT

Objective To investigate the relationship between vascular remodeling patterns of atherosclerotic middle cerebral artery (MCA) stenosis and plaque enhancement.Methods From August 2015 to June 2016,patients with unilateral symptomatic atherosclerotic MCA stenosis underwent routine MRI and black blood magnetic resonance inaging examinations.The vessel area and lumen area of MCA at the site of atherosclerotic MCA stenosis were measured,and the degree of MCA stenosis and the remodeling index were calculated.Results A total of 33 patients were included.Eleven had obvious plaque enhancement,including 9 positive remodeling and 2 negative remodeling;22 did not have plaque enhancement,including 5 positive remodeling,5 no remodeling,and 12 negative remodeling.The obvious plaque enhancement group was mainly positive remodeling (81.8% vs.22.7%),and the no obvious enhancement group was mainly negative remodeling (54.5% vs.18.2%).The difference was statistically significant (P=0.018).Conclusion Plaque enhancement at the site of atherosclerotic MCA stenosis is mainly positive remodeling,which reflects plaque instability.

7.
Chinese Journal of Surgery ; (12): 423-429, 2017.
Article in Chinese | WPRIM | ID: wpr-808806

ABSTRACT

Objective@#To compare the application of iASSIST assisted total knee arthroplasty (TKA) and three-dimentional(3D) printing personal specific instrument (PSI) assist TKA in the treatment of osteoarthritis (OA).@*Methods@#Clinical data of 47 patients with OA admitted at Department of Orthopaedic Surgery in Nanjing Medical University Nanjing Hospital between April and September 2016 were retrospectively reviewed, including 20 males and 27 females, aging from 57 to 77 years with mean age of (63.8±8.2) years. They were randomly divided into iASSIST-TKA group (23 patients) and PSI-TKA group (24 patients). The data such as hip knee ankle (HKA) angle, frontal femoral component (FFC) angle, frontal tibial component (FTC) angle, lateral femoral component (LFC) angle, lateral tibial component (LTC) angle, time of operation, post-operative wound drainage, period of hospitalization, visual analog scale (VAS) and Knee Society Score (KSS) at 1 day, 7 days, 14 days, 1 month and 3 months were recorded and compared between the two groups. T test was used to compare measurement data, Fisher exact test and χ2 test were applied to enumeration data in comparison among groups, and Kruskal-Wallis test was applied to ranked data.@*Results@#The deviation values of HKA, FFC, LFC, FTC and LTC angles were all below 3°(-2° to 2°), and there were no significant difference between iASSIST-TKA group and PSI-TKA group (Z=-0.610 to 0.000, P=0.542 to 1.000). Compared to PSI-TKA group, the time of operation was long((80.7±8.8) minutes vs.(60.2±7.8) minutes), the amount of post-operative wound drainage was increased((210.7±32.1) ml vs.(185.5±30.2)ml) and the period of hospitalization decreased((5.4±2.4) d vs.(6.7±1.6) d) in iASSIST-TKA group, there were significant difference(t=-2.190 to 8.460, P=0.000 to 0.033). There were no significant difference in intra-operative blood drainage((18.4±5.4) ml vs.(17.3±6.2) ml) between the two groups(t=0.650, P=0.521). PSI-TKA group had a superior VAS score(4.8±0.6 vs. 5.5±0.9, 3.6±0.8 vs. 4.3±0.9), KSS clinical score(49.3±5.5 vs. 44.2±6.4, 54.9±4.0 vs. 50.8±4.2) and KSS function score(44.1±2.9 vs. 41.2±3.5, 49.6±3.8 vs. 46.6±3.2) in 1 day and 7 days post-operation(t=-3.420 to 3.150, P=0.001 to 0.007). There were no significant difference in VAS and KSS score in 14 days, 1 month and 3 months post-operation(t=-1.390 to 0.530, P=0.170 to 1.000) between the two groups.@*Conclusions@#The iASSIST-TKA and PSI-TKA can help to make TKA procedure more accurately. iASSIST-TKA may take longer time of operation and have slower recovery, PSI-TKA may need more X-ray input and longer period of hospitalization. The long-term research of both techniques may be valuable for the further clinical usage.

8.
Journal of Practical Radiology ; (12): 1925-1927,1934, 2017.
Article in Chinese | WPRIM | ID: wpr-664022

ABSTRACT

Objective To explore the clinical value of the combined dual-source CT venography(CTV)for the diagnosis of iliac vein compression syndrome(IVCS).Methods 43 patients with clinically suspected IVCS underwent CTV examination.Among them,22 cases were assessed with combined CTV while 21 cases were given conventionally indirect CTV.The lower extremity deep vein was scanned from foot to head.The dual-energy technology was applied for data acquisition.Results Two kinds of CTV methods could be used directly for diagnosing IVCS and checking the asymptomatic mild iliac vein compression.32 IVCS patients were diagnosed by CTV.In 27 cases with deep venous thrombosis(DVT),the average diameter of the left iliac vein was(3.23 ± 1.45)mm and the average compression rate was 67%.The differences were statistically significant in comparisons of the average diameter of left iliac vein between IVCS patients with or without DVT and patients without IVCS.The image quality scores of bidirectional CTV were higher than indirect CTV with statistically significant difference.Conclusion Combined CTV is a feasible technique for lower extremity venography.The image quality of combined CTV is better than conventional indirect CTV with greater clinical value.

9.
Article in Chinese | WPRIM | ID: wpr-663731

ABSTRACT

Objective To evaluate the constancy of CT numbers of SIEMENS Sensation Open CT-simulator by analyzing the CT numbers of seven materials obtained from quality assurance(QA)tests. Methods QA tests for SIEMENS Sensation Open CT-simulator were performed with the Catphan504 phantom monthly. The CT images were obtained using three scan protocols(HeadSeq,RT_Head,and RT_Abdomen)for the CTP404 module in the phantom. The DoseLab software was used to analyze the 72 CT images acquired from January 2014 to December 2015,and the CT numbers(Y)of seven materials were obtained. Statistical analysis was performed on the Y data. The mean,standard deviation,maximum, minimum,and range values of Y for seven materials were calculated in three scan protocols. Results The standard deviation values of air,polymethylpentene,low-density polyethylene,polystyrene,acrylic acid, polyoxymethylene resin(Delrin),and polytetrafluoroethylene(Teflon)were as follows:(1)HeadSeq:0.54, 0.60,0.82,0.58,0.75,0.66,and 1.83 HU;(2)RT_Head:0.08,0.69,0.86,0.66,0.80,0.89,and 2.49 HU;(3)RT_Abdomen:0.11,0.61,0.76,0.72,0.78,0.96,and 2.56 HU.According to the statistical data, the constancy of CT numbers of the SIEMENS Sensation Open CT-simulator was in good condition in two years. Conclusions The variation of CT numbers of Teflon is the biggest among the seven materials. The relative values of CT numbers between different scan protocols vary with the relative electron density of materials.

10.
Article in Chinese | WPRIM | ID: wpr-668159

ABSTRACT

Objective To evaluate non-enhancement magnetic resonance venography (MRV) of iliac vein in diagnosing Cockett syndrome.Methods Magnetic resonance iliac venography was performed with Ingenia 3.0 T superconducting type MRI system.Abdominal surface coil was employed.The scanning sequences included M2DIPEAR (TR/TE=45/5.8 ms,flip angle=60°),THRIVE (TR/TE=6.8/3.5 ms,flip angle=10°),BTFESPAIR (TR/TE=3.4/1.7 ms,flip angle=80°) and FLAIR (TR/TE=9 000/120 ms,flip angle 90°).The layer thickness of 3 mm was used in all scanning,and the average number of acquisition was 3 times.Results On MRV imaging,Cockett syndrome was characterized by narrowed anteroposterior diameter and broadened transverse diameter of the compressed iliac vein,and curved impression could be seen on its anterior border,and collateral vessel formation could be observed.The mean diameters of the left iliac veins in the light,mnedium and severe patients with Cockett syndrome were 7.52,4.83 and 2.76 mm respectively,with the average compression ratios being 37%,69% and 83% respectively.Conclusion Non-enhanced MRV is a feasible method for the diagnosis of iliac vein stenosis,this examination is especially suitable for the checking needs of specific population.

11.
Journal of Practical Radiology ; (12): 608-610,628, 2017.
Article in Chinese | WPRIM | ID: wpr-606691

ABSTRACT

Objective To assess the clinical value of dual-energy CT (DECT) Volume software in quantitative analysis of urate crystals.Methods The DECT data of 60 gout patients based on the American College of Rheumatology diagnostic criteria were analyzed retrospectively.The volumes of urate crystals were quantitatively analyzed by using Volume software with two senior radiologists.The results were statistically analyzed.Results Seventy-two joints of 60 gout patients were scanned by DECT.40 of 43 joints had urate crystals in foot and ankle with the average volume of (0.621±0.742) cm3;18 of 19 joints had urate crystals in knee with the average volume of (0.842±1.086) cm3;10 of 10 joints had urate crystals in hand and wrist with the average volume of (0.796±0.583) cm3.There was no statistical difference for volume measurement between two doctors (P>0.05).The volumes of urate crystals in 4 patients with regular medication were reduced.Conclusion Volume software of DECT can quantitatively analyze urate crystals with a good repeatability, which has high application value in clinical diagnosis and treatment monitoring of gout.

12.
Article in Chinese | WPRIM | ID: wpr-669951

ABSTRACT

Objective To study the influence of early intensive blood pressure (BP) lowering treatment on peri-he?matomal secondary neuronal injury and prognosis after acute intracerebral hemorrhage. Methods A randomised con?trolled trial consisting of 36 consecutive patients within 6 h of intracerebral hemorrhage onset were randomly assigned to intensive BP lowering group and guideline BP lowering group. All patients underwent MR spectroscopy at 72 h and were followed up 90 days. N Acetyl Aspartate/Creatine (NAA/Cr) and lactic acid wave around peri-hematomal at 72 h, neuro?logic function at early stage, and death and/or disability at 90d were compared between these two group. Results Spec?trum lines were obtained from thirty-one patients:14 from intensive BP lowing group and 17 from guideline BP lowering group. There was no significant difference in the percentage declines of NAA/Cr at 72 h between the two groups (13.3%± 4.2% vs. 11.9%± 2.8%, P = 0.308). There was no statistical differences either in neurologic function at 7 d or in death and/or disability at 90 d (P>0.05). Conclusions Early intensive BP-lowering treatment had no role on peri-hematomal secondary neuronal injury and prognosis after acute intracerebral hemorrhage. Further high-quality and large-scale ran?domised controlled trial are necessary to verify this result.

13.
Chinese Journal of Medical Imaging ; (12): 250-254,259, 2015.
Article in Chinese | WPRIM | ID: wpr-601063

ABSTRACT

Purpose To study the application of MR diffusion tensor imaging (DTI) quantitative parameters in grading of cerebral glioma on a 3.0T scanner. Materials and Methods DTI mapping of 51 cases of cerebral glioma confirmed by pathology were retrospective analyzed. All the cases were divided into two groups: low-grade gliomas (grade I-II, 18 cases) and high-grade gliomas (grade III-IV, 33 cases). Value of fractional anisotropy (FA), mean diffusivity (MD), axial diffusivity (AD), radial diffusivity (RD),λ1, λ2, and λ3 of the tumor, peritumoral edema and contralateral tissue area were recorded and compared. Results rMDt, rADt, rRDt, λ1t, λ2t and λ3t of tumor in the low-grade glioma group were higher than those in the high-grade glioma group, and the difference was statistically significant (t=-3.235- -2.458, P0.05). rFAe of peritumoral edema in the low-grade glioma group was higher than those in the high-grade group, while rMDe, rADe, rRDe, λ1e, λ2e and λ3e were lower in the low-grade group. All differences were not statistically significant except λ1e (t=2.052, P<0.05). ROC analysis showed the area under the curve (Az) of rMDt, rADt, rRDt, λ1t, λ2t, λ3t and λ1e were 0.746, 0.710, 0.762, 0.735, 0.722, 0.705 and 0.374, respectively. Az value of rMDt, rADt, rRDt,λ1t, λ2t, λ3t were statistically different between the low- and high-grade gliomas (Z=3.287-4.605, P<0.001). Conclusion Among DTI quantitative parameters on glioma grading, rMD, rAD, rRD, λ1, λ2, and λ3 of tumor area are helpful in grading gliomas.

14.
Chinese Journal of Medical Imaging ; (12): 35-38,40, 2015.
Article in Chinese | WPRIM | ID: wpr-600584

ABSTRACT

Purpose To explore the value of 128-slice dual source CT (DSCT) three-dimensional post-processing techniques in the diagnosis of acute aortic dissection (AAD). Materials and Methods All image data of 116 patients with AAD who underwent conventional and enhanced DSCT scan by dual-energy scanning technology were retrospectively analyzed, and the multi-planar reconstruction (MPR), volume rendering (VR) and maximum intensity projection (MIP) were conducted in the workstation. Taking digital subtraction angiography (DSA) as the diagnostic gold standard, we analyzed the imaging manifestation of the original and 3D-reconstruction images and evaluated the specificity and the sensitivity of diagnostic accuracy and the image quality. Results The diagnostic accuracy of conventional scan was 37.1%(43/116). The display rates of MPR for initial break, intimal flap and true and false lumen were 93.1%, 100.0%and 100.0%, respectively. The display rates of VR and MIP for the initial break were 33.62%and 6.90%, respectively, which was both lower than that of MPR. The display rate of MIP for the true and false lumen was 23.28%. The overall display capability of MPR was significantly better than that of VR and MIP (P<0.01), and the display capability of VR was better than that of MIP (P<0.01). The sensitivity and specificity of enhanced DSCT in the diagnosis of AAD were both 100.0%. Conclusion DSCT has a fast and reliable diagnostic value on AAD. Conventional CT signs should be highly valued in the evaluation of chest or abdominal pain; and a thin layer of MPR and VR should be chosen in the three-dimensional reconstruction;whilst MIP reconstruction may be unnecessary for AAD.

15.
Chinese Journal of Radiology ; (12): 610-614, 2015.
Article in Chinese | WPRIM | ID: wpr-476579

ABSTRACT

Objective To explore the diagnostic value of the CT angiography (CTA) in the detection of mechanical obstructive cause of deep venous thrombosis of lower extremity. Methods Forty-seven cases of CTA and DSA image data of DVT in lower extremity with mechanical obstruction were retrospectively analyzed. The CTA three-dimensional reconstruction images were compared with DSA results, and the position and size of thrombus, collateral circulation of blood vessels, vascular compression area and the corresponding outside vascular lesions were evaluated. The causes of venous occlusion were analyzed. Diagnostic agreement of CTA and DSA was assessed by Kappa statistics. The difference of the accuracy between CTA and DSA in the diagnosis of the left and right iliac femoral vein, inferior vena cava, internal iliac vein thrombosis were analyzed with χ2 test. Results There were 47 patients with lower extremity DVT. Of them, DVT was detected in the left leg in 28 patients, in the right leg in 14 patients and in both lower extremities in 5 patients. Mechanical obstruction caused DVT in all of them. There were 27 patients of iliac vein compression syndrome(IVCS)complicated with lower limb DVT. The left iliac vein was oppressed by the right common iliac artery with compression degree from 55.41%to 100.00%,and mean of(77.1 ± 16.8)%. There was congenital stenosis or occlusion of inferior vena cava in 3 patients. There was Budd-Chiari syndrome in 2 patients. There was pelvic mass pressing the common iliac vein in 4 patients. Enlarged right inguinal lymph nodes oppressed the right femoral vein in 3 patients and enlarged left inguinal lymph nodes oppressed the left femoral vein in 2 patients. Other mechanical obstruction factors caused DVT in 6 patients, including right iliac artery aneurysms,spontaneous hematoma, etc. The agreement of CTA and DSA on the diagnosis of the iliac femoral thrombosis was good (Kappa=0.978), the diagnosis agreement on the inferior vena cava thrombus was good (Kappa = 0.737), while the diagnosis agreement on the internal iliac vein thrombosis was poor (Kappa=0.189). The difference of CTA and DSA in the diagnosis of left and right iliac femoral venous thrombosis was not statistically significant (52,51 case;χ2=0.00, P>0.05), neither was the diagnostic difference of inferior vena cava thrombus (21,17 cases;χ2=1.50, P>1.50). However, the difference of the diagnosis of the iliac vein thrombosis was statistically significant (14,2 cases;χ2=8.33, P<0.05) . Conclusions CTA can clearly show the location and scope of the thrombus. Compared with conventional DSA, CTA shows higher diagnostic coincidence rate, and can accurately determine the mechanical obstruction causes of lower extremity DVT.

16.
Article in Chinese | WPRIM | ID: wpr-464599

ABSTRACT

Objective To evaluate multi-slice spiral CT venography (MSCTV) and digital subtraction venography (DSV) in diagnosing iliac vein compression syndrome (IVCS) and secondary thrombosis. Methods The imaging materials, including MSCTV and DSV performed before and after the thrombolysis therapy, of 38 patients with clinically-suspected IVCS were collected. The inner diameters of the compressed iliac veins were measured on MSCTV images and the compression ratio was calculated. Usingχ2 test, the detection rates of IVCS by MSCTV and DSV were compared. Results Of 38 patients, IVCS was detected by MSCTV in 29, by pretreatment DSV in 20 and by post-treatment DSV in 29. The difference in the detection rate of IVCS between MSCTV and pre-treatment DSV was statistically significant (χ2=4.65, 0.010.05). Conclusion For the diagnosis of IVCS, MSCTV is superior to pre-treatment DSV in the diagnostic accuracy of iliac vein compression syndrome. Therefore, MSCTV should be used as the preferred method of examination.(J Intervent Radiol, 2015, 24:301-305)

17.
Article in Chinese | WPRIM | ID: wpr-815463

ABSTRACT

OBJECTIVE@#To evaluate dual-source CT in the Standford B aortic dissection in the postoperative follow-up and to compare radiation dose of dual-energy mode with single-energy scanning.@*METHODS@#A total of 40 patients with aortic dissection after endovascular exclusion underwent dualsource CT. Tweny patients took the dual-energy scanning mode (100 kV and 140 kV, pitch 1.0); the other 20 patients had single-energy mode (120 kV, pitch 2.0). In both groups CareDose4D technology was used to track the current method. All images were analyzed to observe the stent shape, with or without endoleaks and the rate of thrombosis absorption. Radiation dose, scan length, and scan time were recorded for all patients, and then compared between dual-energy mode and single-energy scanning.@*RESULTS@#The difference in scan length and image quality was not significant between the dualenergy group and the single-energy group. The acquisition time of the dual-energy group was longer than that of the single-energy group, with significant difference. Radiation dose of the single-energy group was lower than that of the dual-energy group, with significant difference.@*CONCLUSION@#Dual-source CT can objectively evaluate the conditions after the endovascular exclusion of aortic dissection. The operative effect and complications may be analyzed comprehensively. The radiation dose of the single-energy scan mode with medium pitch is lower than that of the dual-energy mode.


Subject(s)
Aneurysm, Dissecting , Diagnostic Imaging , Aortic Aneurysm , Diagnostic Imaging , Humans , Radiation Dosage , Sensitivity and Specificity , Tomography, X-Ray Computed
18.
Article in Chinese | WPRIM | ID: wpr-403442

ABSTRACT

Objective To investigate retrospectively CT,MRI and DSA appearances of giant cell tumors(GCT) of bone in unusual sites,in order to improve the diagnosis of it.Methods CT,MRI and DSA features of GCT in 11 cases proved by surgery and pathology,were retrospectively analyzed.GCTs located in iliac bone in 4,sacral vertebrae in 3,ischial bone in 2, calcaneus and temporal bone in one respectively.Results (1) At CT,the tumors were mainly showed as expanding growth and osteolytic destruction,without periosteal reaction and calcification.(2)At MRI,the tumors were hypo-,isointensity on T_1WI and heterogeneously iso, hyperintensity on T_2WI.Low intensity curvilinear strips inside the tumor on T_1WI and T_2WI were found in 5 patients,and "bright patches sign" on T_2WI were also displayed in 2 cases.(3)At DSA,abundant blood supply to the tumors was demonstrated,the thickened and twisted feeding artery and,"tumor's stain sign" were also found.Conclusion To analyse imaging data synthetically,including CT,MR imaging and DSA,can improve the knowledge of GCT of bone in unusual sites.

19.
Article in Chinese | WPRIM | ID: wpr-403440

ABSTRACT

Objective To evaluate the clinical value of MSCTA in displaying the right gastroepiploic artery(RGEA).Methods 16-slice spiral CT enhanced images of abdomen in 80 cases were retrospectively reviewed.The course and the length of RGEA were observed and the diameters of RGEA at the origin and the end were also measured on maximum intensity projection(MIP),thin slice maximum intensity projection(TSMIP) and volume rendering(VR) images.Results The displaying rate of RGEA by MSCTA was 100% including long type in 22 cases(27.50%),moderate type in 53 cases(66.25%) and short type in 5 cases(6.25%).The average length of RGEAs was (19.5±4.5) cm.The average diameters of RGEAs at the origin in long,moderate and short type respectively were (2.69±0.26) mm,(2.70±0.18) mm,(2.68±0.12) mm respectively.The average diameters of RGEAs at the end in these three types were (1.76±0.17) mm,(1.75±0.18) mm and (1.74±0.05) mm respectively.The average diameters of RGEA in different length were no of statistical significance(P>0.05).Conclusion RGEA can be evaluated with MSCTA before coronary artery bypass grafting.

20.
Article in Chinese | WPRIM | ID: wpr-471677

ABSTRACT

Objective To assess the diagnostic value of magnetization transfer contrast (MTC) gradient echo (GRE) T2WI sequence in bone injury of knee joint. Methods MRI data of 56 patients with knee injury were analyzed retrospectively. All patients underwent SE sequence (sagittal T1WI, T2WI) and sagittal MTC-GRE T2WI sequence. The size, signal intensity and margin of bone contusion with different MRI sequence were analyzed and compared. Results Among 56 patients, 43 and 45 cases were demonstrated on SE T1WI and T2WI, respectively; 50 cases were displayed on MTC-GRE T2WI sequence. The size, border of bone contusions and sensitivity displayed on MTC-GRE T2WI sequence were statistically higher than those on SE sequence (P<0.05). Conclusion MTC-GRE T2WI sequence has great diagnostic value in contusion of knee joint, which is superior to FSE sequence.

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