The study of the detection methods in the pulmonary embolism with multi-slice helical CT
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Objective:To study the Multi-slice Helical CT detection methods in the pulmonary embolism.Methods:15 suspected patients with pulmonary embolism were performed with dual-phase enhanced CT scan and all the data were reconstructed by MPR,VR,CPR and MIP in the workstop.Results:All cases were acquired content imaging,and 34 branches of pulmonary embolism were identified in 15 cases: right pulmonary arteries in 6 cases(17.6%),left pulmonary arteries in 7 cases(20.6%),lobar arteries in 12 cases(35.3%),segmental arteries in 8 cases(23.5%),subsegmental artery in 1 case(2.9%).Conclusion:MSCT and CTA are the effective immediate,and safe methods for the diagnosis of pulmonary embolism.Keywords:
Helical computed tomography
Main Pulmonary Artery
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Objective To discuss 64-slice spiral CT pulmonary angiography(CTPA) with a variety of image processing methods in the diagnosis of pulmonary embolism(PE).Methods The clinical data of 64 cases with suspected PE were selected since January 2009,from which a retrospective diagnosis was made with different image processing methods.Results When examining arteries in 1 level,there was no significant difference between MPR,MIP and VR in detection rate.For arteries in 2-3 level,MPR had a higher detection rate,which was significantly different from MIP and VR(P 0.05).For arteries in 4-5 level,MPR also had a higher detection rate than MIP and VR,but the results showed no statistical significance(P 0.05).Conclusions Combined with a variety of image processing methods,CTPA can increase the detection rate of PE,which is conducive to the early diagnosis,clinical evaluation and reduction of mortality,providing a basis for surgical treatment.
Clinical Significance
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Objective To explore the application of pneumoangiography with multi-slice CT(MSCT)in the diagnosis of pulmonary embolism(PE).Methods Twenty patients with pulmonary embolization were included in this study.CT pulmonary angiography(CTPA)was performed with 16 row helix CT(collimation=1.0 mm and pitch=1.25).The raw data were reconstructed with 1.25 mm and 3.0 mm slice thickness,respectively.MIP of 2 mm and 5 mm and MPR were used to observe the embolization.The results of different post-processing technologes were compared with each other.Results Main pulmonary trunk,left or right pulmonary branch,and lobar,segmental or sub-segmental pulmonary artery were displayed well with MSCT,and 232 branches were displayed.No difference was found between the numbers of involved pulmonary artery trunk and lobar artery in different post-processing techniques.With respect to segmental pulmonary artery and subsegmental artery,MRP was better than the other post-processing methods(P0.05).Conclusion Multilayer helix CT angiography for the pulmonary embolism is safe and non-invasive modality with high sensibility and specificity.
Pulmonary angiography
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Objective:To study the valuation of multi-slice spiral CT in the diagnosis of pulmonary embolism.Methods:24 cases of pulmonary embolism were examined with multi-slice spiral CT pulmonary angiography,the reformation images consisted of 1.0 mm slices,with 0.7 mm reconstruction intervals and 0.75 mm slices,with 0.5 mm reconstruction intervals,VRT,MIP and MPR were adopted as post-processing techniques of CT pulmonary angiography,and then images were compared.Results:In 24 cases of PE,76 branches of pulmonary embolism were identified,including 6 aortopulmonay arteries,36 lobar arteries,27 segmental pulmonary arteries and 7 subsegmental pulmonary arteries,PE showed that was no a significant difference between images of 1.0 mm slices and 0.75 mm slices reformation.Conclusion:Multi-slice spiral CT pulmonary angiography proves to be highly sensitivity and strongly specificity for the diagnosis of pulmonary embolism,CTPA is safety,immediate,noninvasive,it shoud be the first choice for the detection of PE.
Pulmonary angiography
Spiral computed tomography
Pulmonary vasculature
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Objective To study the role of pulmonary angiography with multi-slice spiral CT in the diagnosis of pulmonary embolism (PE). Methods Nineteen patients suspected of pulmonary embolism were examined with CT pulmonary angiography,and the technique of maximum intensity projection (MIP),volume rendering technique (VRT) and multiplanar reformation (MPR). Results PE was diagnosed in 12 of 19 patients,and 104 branches were detected,including main pulmonary arteries,lobar arteries,segment arteries,and deuto-segment arteries. Conclusion Multi-slice spiral CT pulmonary angiography is non-invasive,fast and highly sensitive for diagnosis of PE.
Maximum intensity projection
Pulmonary vasculature
Pulmonary angiography
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Objective To study the clinical value of 64-slice helical CT pulmonary artery angiography in detection of pulmonary embolism.Methods Twenty-five patients with PE underwent 64-slice helical CT angiography(CTA),two-dimensional and three-dimensional reformation were performed in all cases including maximum intensity projection(MIP),multiplanar reconstruction(MPR) and volume rendering(VR).All the data of CTA were retrospecttvely analysed.Results 64-slice-helical CT clearly showed the sites,extensions and stenosed lumens of PE in all patients.On CTA images,PE lesions appeared as intraluminal irregular-plaque shape and adhered-mural filling defects whose periphery was probably encased by the contrast medium with hyperdensity.Conclusion 64-slice spiral CT angiography is one of the most effective and non-invasive imaging modalities in the diagnosis of pulmonary embolism.
Maximum intensity projection
Pulmonary angiography
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Objective To investigate the role of multi-detector spiral CT in diagnosis of acute pulmonary embolism (PE). Methods Thin collimation multi-detector spiral CT pulmonary angiography (CTPA) and CT venography (CTV) were preformed in 21 patients suspected of acute PE. Results CTPA detected 12 cases of acute PE while CTV detected 8 cases of deep vein thrombosis (DVT) in the 21 patients. 92.7% and 72.9% of segmental and subsegmental pulmonary arteries were visualized respectively in 1 mm effective thickness images while 87.9% and 39.3% of them were identified respectively by using 3 mm effective thickness images ( P 0.05). Seventy-five embolus in segmental and thirty-seven embolus in subsegmental pulmonary arteries were detected by analyzing 1 mm effective thickness images, while 53 in segmental and 15 in subsegmental pulmonary arteries were demonstrated by using 3 mm effective thickness images( P 0.05). Conclusion multi-detector spiral CT can facilitate the diagnosis of acute PE.
PULMONARY EMBOLUS
Embolus
Pulmonary angiography
Spiral computed tomography
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Objective To evaluate the value of 16-slice spiral CT pulmonary angiography in detecting peripheral pulmonary embolismin canine models. Methods The peripheral pulmonary embolism animal modes were made in 9 dogs by introducing gelatin sponge of2～4 mm in diameter and 1 cm at length into pulmonary arteries through a catheter under DSA,MSCTPA examination was performed 10 dayslatter, the original images were reconstructed at the console workstation. The image findings were compared with that of pathologicaldissections.Results The program of pulmonary embolism models in 9 cases was finished and pulmonary infarction were found in four dogs,52 pulmonary arteries including 2 lode arteries , 18 segmental arteries and 32 subsegmental arteries were involved to be found on MSCTPA,while 55 pulmonary arteries including 2 lode arteries,18 segmental arteries and 35 subsegmental arteries were involved in pathologicaldissections .The accuracy of 16-slice spiral CT pulmonary angiography in diagnosis of peripheral pulmonary embolism and subsegmental pulmonary embolism was 94.34% and 91.43%,respectively, the positive predictive value was 94.12% in latter.Conclusion 16-slice spiral CT is a feasible method in diagnosing pulmonary embolism.
Spiral computed tomography
Pulmonary Infarction
Pulmonary angiography
Coronary arteries
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Objective To investigate the diagnostic value of multi-slice CT angiography(MSCTA) with different reconstruction intervals in diagnosis of pulmonary embolism. Materials and Methods 36 patients with pulmonary embolism underwent MSCTA and the transverse images were reconstructed with 10%、50%、70% overlapping followed by MPR respectively.The manifestation ratio of pulmonary embolus in transverse and MPR images with different reconstruction intervals were compared. Results 298 pulmonary arteries were involved among 36 pulmonary embolism patients.Three different types of transverse and the coresponding MPR images had the same result for detecting the embolism of primary pulmonary artery and lobar arteries.For detecting the embolism of segmental arteries,the images with 50% and 70% overlapping were much better than images with 10% overlapping,and no significant difference was observed between images with 50% and 70% overlapping. Conclusion The transverse images with 50% overlapping can improve the manifestation ratio of segmental arteries embolism compared with images with 10% overlapping,and there is no need to increase the reconstruction interval to 70%.
Pulmonary angiography
PULMONARY EMBOLUS
Embolus
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Objective:To discuss the diagnostic value of spiral CT pulmonary angiography in the diagnosis of pulmonary embolism(PE).Methods:12 patients with PE were performed spiral CT volume scanning.Three dimensional and multiplanar images of pulmonary artery were obtained after post procession in the work station.Results:Among 196 branches of pulmonary arteries in 12 patients,PE was found in 46.4%.Embolism located in main pulmonary artery,left or right pulmonary artery,lobar arteries and segmental arteries.On multiplanar images,it showed intraluminal filling defect or no contrast medium in distant pulmonary arteries.On the pulmonary angiography images,it showed filling defect or cutting off sign in main pulmonary arteries;similar changes were observed in the lobar or segmental branches.Conclusion:SCTA images could obtain more diagnostic imformation by observing PE from different directions.SCTA is a reliable method in diagnosis of PE above the level of lobar or segmental artery.
Pulmonary angiography
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Objective To study the clinical value of 64-slice helical CT pulmonary artery angiography in detection of pulmonary embolism(PE).Methods Eighteen patients with PE underwent 64-slice helical CT angiography(CTA), two-dimensional and three-dimensional reformation were performed in all cases including maximum intensity projection (MIP), multiplanar reconstruction (MPR), and volume rendering (VR).All the data of CTA was retrospectively analysed . Results Among 18 cases , there were 2 central PE , 13 lobar and segment PE,3 peripheral PE , the largest diameter of thrombus shown in our experiment was about 29.4 mm and the smallest was about 1.8 mm.Conclusion As a harmless examination, 64-slice helical CT pulmonary artery angiography plays an important role in detection and therapy of pulmonary embolism.
Maximum intensity projection
Pulmonary angiography
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