The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
W P T M Mali - One of the best experts on this subject based on the ideXlab platform.
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multidirectional depiction of internal carotid arterial stenosis three dimensional time of flight mr Angiography versus rotational and conventional digital subtraction Angiography
Radiology, 2000Co-Authors: O E H Elgersma, Aloys F J Wust, Pieter C Buijs, Y Van Der Graaf, B C Eikelboom, W P T M MaliAbstract:PURPOSE: To evaluate whether and to what extent greater number of projection images obtained at three-dimensional (3D) time-of-flight (TOF) magnetic resonance (MR) Angiography versus conventional digital subtraction Angiography (DSA) causes overestimation of internal carotid arterial (ICA) stenosis. MATERIALS AND METHODS: DSA (two or three projections), rotational Angiography (16 or 32 projections), and 3D TOF MR Angiography (12 projections) were performed in 47 stenotic ICAs of 38 symptomatic patients. Two observers independently measured maximum stenosis, and the mean differences among MR Angiography, DSA, and rotational Angiography were compared. RESULTS: Three rotational and five MR angiograms were nondiagnostic. Seven MR angiograms of ICA stenoses showed a signal void and were excluded from analysis. On the remaining 32 angiograms, mean differences in maximum stenosis for observers 1 and 2, respectively, were 7% (95% CI: 3%, 12%) and 8% (95% CI: 3%, 13%) at MR Angiography versus DSA and 2% (95% CI: -2%, 7%) and -1% (95% CI: -5%, 3%) at MR Angiography versus rotational Angiography. ICA stenosis was graded significantly higher at MR Angiography versus DSA, whereas, it was not overestimated at MR Angiography versus rotational Angiography. The difference in maximum stenosis at MR Angiography versus DSA was significantly different from that of MR Angiography versus rotational Angiography. CONCLUSION: Apparent overestimation of ICA stenosis at 3D TOF MR Angiography versus conventional DSA may be partly explained by the greater number of projection images available at 3D TOF MR Angiography.
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multidirectional depiction of internal carotid arterial stenosis three dimensional time of flight mr Angiography versus rotational and conventional digital subtraction Angiography
Radiology, 2000Co-Authors: O E H Elgersma, Aloys F J Wust, Pieter C Buijs, B C Eikelboom, Y Van Der Graaf, W P T M MaliAbstract:PURPOSE: To evaluate whether and to what extent greater number of projection images obtained at three-dimensional (3D) time-of-flight (TOF) magnetic resonance (MR) Angiography versus conventional digital subtraction Angiography (DSA) causes overestimation of internal carotid arterial (ICA) stenosis. MATERIALS AND METHODS: DSA (two or three projections), rotational Angiography (16 or 32 projections), and 3D TOF MR Angiography (12 projections) were performed in 47 stenotic ICAs of 38 symptomatic patients. Two observers independently measured maximum stenosis, and the mean differences among MR Angiography, DSA, and rotational Angiography were compared. RESULTS: Three rotational and five MR angiograms were nondiagnostic. Seven MR angiograms of ICA stenoses showed a signal void and were excluded from analysis. On the remaining 32 angiograms, mean differences in maximum stenosis for observers 1 and 2, respectively, were 7% (95% CI: 3%, 12%) and 8% (95% CI: 3%, 13%) at MR Angiography versus DSA and 2% (95% CI: −...
Toshisuke Sakaki - One of the best experts on this subject based on the ideXlab platform.
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use of spiral computerized tomography Angiography in patients with subarachnoid hemorrhage in whom subtraction Angiography did not reveal cerebral aneurysms
Journal of Neurosurgery, 2000Co-Authors: Hiroyuki Hashimoto, Junichi Iida, Yasuo Hironaka, Masato Okada, Toshisuke SakakiAbstract:Object. Patients with subarachnoid hemorrhage (SAH) in whom Angiography does not demonstrate diagnostic findings sometimes suffer recurrent disease and actually harbor undetected cerebral aneurysms. The management strategy for such cases remains controversial, but technological advances in spiral computerized tomography (CT) Angiography are changing the picture. The purpose of this prospective study was to examine how spiral CT Angiography can contribute to the detection of cerebral aneurysms that cannot be visualized on Angiography. Methods. In 134 consecutive patients with SAH, a prospective search for the source of bleeding was performed using digital subtraction (DS) and spiral CT Angiography. In 21 patients in whom initial DS Angiography yielded no diagnostic findings, spiral CT Angiography was performed within 3 days. Patients in whom CT Angiography provided no diagnostic results underwent second and third DS Angiography sessions after approximately 2 weeks and 6 months, respectively. Six patients w...
S L Roberts - One of the best experts on this subject based on the ideXlab platform.
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circle of willis evaluation with spiral ct Angiography mr Angiography and conventional Angiography
Radiology, 1995Co-Authors: D A Katz, Paige M Bracci, Sandy Napel, Michael P. Marks, S L RobertsAbstract:PURPOSE: To evaluate the use of spiral computed tomographic (CT) Angiography in the analysis of the arteries of the circle of Willis and compare these results with magnetic resonance (MR) Angiography and conventional Angiography. MATERIALS AND METHODS: The results in 17 patients who underwent examination were prospectively studied in a blinded fashion. The presence or absence of the arteries of the circle of Willis was determined by using maximum intensity projection reconstructions from CT Angiography and MR Angiography. These results were compared with results from conventional Angiography. RESULTS: Similar sensitivities were determined for CT Angiography (88.5%) and MR Angiography (85.5%); however, MR Angiography was found to differ significantly (P = .005) from conventional Angiography. No significant differences (P > .05) were found between the two modalities and conventional Angiography in the detection of the anterior, middle, or posterior cerebral arteries or the anterior communicating artery. CON...
O E H Elgersma - One of the best experts on this subject based on the ideXlab platform.
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multidirectional depiction of internal carotid arterial stenosis three dimensional time of flight mr Angiography versus rotational and conventional digital subtraction Angiography
Radiology, 2000Co-Authors: O E H Elgersma, Aloys F J Wust, Pieter C Buijs, Y Van Der Graaf, B C Eikelboom, W P T M MaliAbstract:PURPOSE: To evaluate whether and to what extent greater number of projection images obtained at three-dimensional (3D) time-of-flight (TOF) magnetic resonance (MR) Angiography versus conventional digital subtraction Angiography (DSA) causes overestimation of internal carotid arterial (ICA) stenosis. MATERIALS AND METHODS: DSA (two or three projections), rotational Angiography (16 or 32 projections), and 3D TOF MR Angiography (12 projections) were performed in 47 stenotic ICAs of 38 symptomatic patients. Two observers independently measured maximum stenosis, and the mean differences among MR Angiography, DSA, and rotational Angiography were compared. RESULTS: Three rotational and five MR angiograms were nondiagnostic. Seven MR angiograms of ICA stenoses showed a signal void and were excluded from analysis. On the remaining 32 angiograms, mean differences in maximum stenosis for observers 1 and 2, respectively, were 7% (95% CI: 3%, 12%) and 8% (95% CI: 3%, 13%) at MR Angiography versus DSA and 2% (95% CI: -2%, 7%) and -1% (95% CI: -5%, 3%) at MR Angiography versus rotational Angiography. ICA stenosis was graded significantly higher at MR Angiography versus DSA, whereas, it was not overestimated at MR Angiography versus rotational Angiography. The difference in maximum stenosis at MR Angiography versus DSA was significantly different from that of MR Angiography versus rotational Angiography. CONCLUSION: Apparent overestimation of ICA stenosis at 3D TOF MR Angiography versus conventional DSA may be partly explained by the greater number of projection images available at 3D TOF MR Angiography.
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multidirectional depiction of internal carotid arterial stenosis three dimensional time of flight mr Angiography versus rotational and conventional digital subtraction Angiography
Radiology, 2000Co-Authors: O E H Elgersma, Aloys F J Wust, Pieter C Buijs, B C Eikelboom, Y Van Der Graaf, W P T M MaliAbstract:PURPOSE: To evaluate whether and to what extent greater number of projection images obtained at three-dimensional (3D) time-of-flight (TOF) magnetic resonance (MR) Angiography versus conventional digital subtraction Angiography (DSA) causes overestimation of internal carotid arterial (ICA) stenosis. MATERIALS AND METHODS: DSA (two or three projections), rotational Angiography (16 or 32 projections), and 3D TOF MR Angiography (12 projections) were performed in 47 stenotic ICAs of 38 symptomatic patients. Two observers independently measured maximum stenosis, and the mean differences among MR Angiography, DSA, and rotational Angiography were compared. RESULTS: Three rotational and five MR angiograms were nondiagnostic. Seven MR angiograms of ICA stenoses showed a signal void and were excluded from analysis. On the remaining 32 angiograms, mean differences in maximum stenosis for observers 1 and 2, respectively, were 7% (95% CI: 3%, 12%) and 8% (95% CI: 3%, 13%) at MR Angiography versus DSA and 2% (95% CI: −...
Gabriel J E Rinkel - One of the best experts on this subject based on the ideXlab platform.
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surgical anatomy of the cerebral arteries in patients with subarachnoid hemorrhage comparison of computerized tomography Angiography and digital subtraction Angiography
Journal of Neurosurgery, 2001Co-Authors: Birgitta K Velthuis, Maarten S Van Leeuwen, T D Witkamp, Lino M P Ramos, Jan Willem Berkelbach Van Der Sprenkel, Gabriel J E RinkelAbstract:Object. The purpose of this study was to compare computerized tomography (CT) Angiography and digital subtraction (DS) Angiography studies in patients with subarachnoid hemorrhage (SAH) to assess their vascular anatomy relevant to cerebral aneurysm surgery. Methods. From a prospective series of 100 patients with SAH, the authors selected 73 patients whose CT Angiography studies were of adequate quality and in whom DS Angiography of both carotid arteries had been performed. Eleven patients with no DS angiographic studies of the vertebrobasilar artery were only evaluated for the anterior half of the circle of Willis. Anterior communicating arteries (ACoAs), both precommunicating anterior cerebral arteries (A1 segments), both posterior communicating arteries (PCoAs), and both precommunicating posterior cerebral arteries (P1 segments) were assessed on CT Angiography and DS Angiography by two independent observers. Conclusions. Computerized tomography Angiography compares well with DS Angiography for visualizi...
