Objective To assess the accuracy of three dimensional electron beam CT angiography (3D EBCTA) in the detection of intracranial aneurysms Methods 31 patients with suspected cerebral aneurysms (including 3 post o...Objective To assess the accuracy of three dimensional electron beam CT angiography (3D EBCTA) in the detection of intracranial aneurysms Methods 31 patients with suspected cerebral aneurysms (including 3 post operative patients) were examined by 3D EBCTA Those receiving angiography or surgery acted as controls Maximum intensity projection (MIP) and shaded surface display (SSD) reconstruction ways were selected Results 24 aneurysms were found in 23 patients Of the 31 patients, false positive was noted in 1 patient,and false negative in 2 on 3D EBCTA The sensitivity, specificity, accuracy, positive predictive value and negative predictive value were 92 0%, 88 9%, 91 2%, 95 8% and 80 0% respectively Conclusion 3D EBCTA is an noninvasive, rapid, valuable method in diagnosis and screening of patients with suspected aneurysms The reconstruction modes such as MIP and SSD should be used together to optimise the visualization展开更多
Objective To evaluate the clinical applications and limitations of CT virtual endoscopy (CTVE) in theauditory ossicular chain.Methods CTVE of the auditory ossicular chain was performed with 1.0 mm collimation at pitc...Objective To evaluate the clinical applications and limitations of CT virtual endoscopy (CTVE) in theauditory ossicular chain.Methods CTVE of the auditory ossicular chain was performed with 1.0 mm collimation at pitch 1.0, bone algorithm, 9.6 cm field of view, and 0.1 - 0.2 mm reconstruction interval in 40 patients with middle ear diseases. 30 cases were confirmed by surgery. Results were compared with the findings of axial high resolution CT (HRCT) and multiplanar reformation (MPR) images and surgery.Results The accuracy of CTVE images in detecting ossicular destruction was 92.6%, significantly higher than that of axial HRCT (83.9%) and multiplanar reformation (76.5%) images. CTVE could also clearty reveal the postoperative condition and congenital dysplasia of the auditory ossicular chain.Conclusions CTVE can clearly demonstrate a three-dimensional image of the auditory ossicular chain and is useful in evaluating diseases of the ear, especially the auditory ossicles. CTVE could not clearly demonstrate abnormal soft tissue within the tympanic cavity, abnormal changes of the tympanic membrane and tympanic walls, and could be easily influenced by artificial factors.展开更多
文摘Objective To assess the accuracy of three dimensional electron beam CT angiography (3D EBCTA) in the detection of intracranial aneurysms Methods 31 patients with suspected cerebral aneurysms (including 3 post operative patients) were examined by 3D EBCTA Those receiving angiography or surgery acted as controls Maximum intensity projection (MIP) and shaded surface display (SSD) reconstruction ways were selected Results 24 aneurysms were found in 23 patients Of the 31 patients, false positive was noted in 1 patient,and false negative in 2 on 3D EBCTA The sensitivity, specificity, accuracy, positive predictive value and negative predictive value were 92 0%, 88 9%, 91 2%, 95 8% and 80 0% respectively Conclusion 3D EBCTA is an noninvasive, rapid, valuable method in diagnosis and screening of patients with suspected aneurysms The reconstruction modes such as MIP and SSD should be used together to optimise the visualization
文摘Objective To evaluate the clinical applications and limitations of CT virtual endoscopy (CTVE) in theauditory ossicular chain.Methods CTVE of the auditory ossicular chain was performed with 1.0 mm collimation at pitch 1.0, bone algorithm, 9.6 cm field of view, and 0.1 - 0.2 mm reconstruction interval in 40 patients with middle ear diseases. 30 cases were confirmed by surgery. Results were compared with the findings of axial high resolution CT (HRCT) and multiplanar reformation (MPR) images and surgery.Results The accuracy of CTVE images in detecting ossicular destruction was 92.6%, significantly higher than that of axial HRCT (83.9%) and multiplanar reformation (76.5%) images. CTVE could also clearty reveal the postoperative condition and congenital dysplasia of the auditory ossicular chain.Conclusions CTVE can clearly demonstrate a three-dimensional image of the auditory ossicular chain and is useful in evaluating diseases of the ear, especially the auditory ossicles. CTVE could not clearly demonstrate abnormal soft tissue within the tympanic cavity, abnormal changes of the tympanic membrane and tympanic walls, and could be easily influenced by artificial factors.
