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Mark C Sofilos - One of the best experts on this subject based on the ideXlab platform.
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multi detector row ct angiography of lower extremity arterial inflow and runoff initial experience
Radiology, 2001Co-Authors: Geoffrey D Rubin, Laura J Logan, Andrew J Schmidt, Mark C SofilosAbstract:PURPOSE: To assess the patterns of lower extremity arterial inflow and runoff opacification with four-channel multi–detector row computed tomographic (CT) angiography in a cohort of patients with disease warranting imaging of the lower extremity arterial system. MATERIALS AND METHODS: Twenty-four patients with symptomatic lower extremity arterial occlusive or aneurysmal disease underwent imaging with four-channel multi–detector row CT from the supraceliac abdominal aorta through the feet. Transverse Sections were acquired with a 2.5-mm nominal detector width and pitch of 6.0 (3.2-mm effective Section Thickness) following intravenous injection of 174–185 mL of iodinated contrast medium (300 mg iodine per milliliter). In each patient, attenuation measurements were recorded in 16 arterial and 16 venous locations. In 18 patients, two radiologists assessed the detectability and stenosis degree of 21 arterial segments per patient relative to these features at conventional angiography. RESULTS: A mean scannning ...
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aorta and iliac arteries single versus multiple detector row helical ct angiography
Radiology, 2000Co-Authors: Geoffrey D Rubin, Maria C Shiau, Ann N Leung, Stephen T Kee, Laura J Logan, Mark C SofilosAbstract:PURPOSE: To compare single- versus four-channel helical computed tomographic (CT) aortography. MATERIALS AND METHODS: Forty-eight patients with aortic aneurysm or disSection underwent four- and one-channel CT angiography. Scan pairs covered the thoracic inlet to the diaphragm (n = 10) and supraceliac abdominal aorta (n = 19) or thoracic inlet (n = 19) to the femoral arterial bifurcations. For four-channel CT, nominal Section Thickness and pitch were 2.5 mm and 6.0, respectively, and for one-channel CT, 3.0 mm and 2.0 to the infrarenal aorta and 5.0 mm and 2.0 to the femoral arteries. Effective Section Thickness, scanning duration, scanning coverage, dose of iodinated contrast material, and mean aortoiliac attenuation were compared. Data were summarized as speed (coverage/duration), scanning efficiency (speed/Section Thickness), and contrast efficiency (mean aortic attenuation/dose of contrast material). RESULTS: At four- versus one-channel CT, CT angiography was 2.6 times faster, scanning efficiency was 4...
Emine Genc - One of the best experts on this subject based on the ideXlab platform.
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retrograde flow in the left inferior petrosal sinus and blood steal of the cavernous sinus associated with central vein stenosis mr angiographic findings
American Journal of Neuroradiology, 2003Co-Authors: Yahya Paksoy, Bulent Oguz Genc, Emine GencAbstract:BACKGROUND AND PURPOSE: We attempted to identify the cause of abnormal venous flow seen during arterial MR angiography in the inferior petrosal sinus by use of in three female patients (aged 51, 48, and 70 years, respectively). METHODS: Arterial 3D time-of-flight MR angiography was performed with a tilted optimized nonsaturating excitation pulse sequence (TR/TE, 31/7; flip angle, 20 degrees; Section Thickness, 65 mm; effective Thickness, 1 mm; number of Sections, 1 to 2); no magnetization transfer pulse sequence was used. Contrast-enhanced 3D MR angiography of the neck was performed with a 3D fast low-angle shot pulse sequence (TR/TE, 4.6/1.8; flip angle, 40 to 45 degrees; Section Thickness, 80 mm; interSection gap, 1.5 mm; acquisition matrix, 180 x 256; acquisition time, 27 s) on a system with a whole-body coil. RESULTS: In all three patients, 3D time-of-flight MR angiography revealed abnormal vascular signal originating from the left cavernous sinus, continuing through the inferior petrosal sinus, and ending in the proximal internal jugular vein at the jugular bulb level. Abnormal vascular signal at the jugular bulb, sluggish flow and flow-related enhancement in the left internal jugular vein, and signal void in the contralateral jugular vein were noted. Contrast-enhanced delayed-phase MR angiography showed stenosis in the left brachiocephalic vein in all patients. CONCLUSION: High signal intensity noted at the inferior petrosal sinus resulted from retrograde flow. Retrograde flow was due to blood stealing from the internal jugular vein toward the cavernous sinus because of venous stenosis in the brachiocephalic vein.
Geoffrey D Rubin - One of the best experts on this subject based on the ideXlab platform.
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multi detector row ct angiography of lower extremity arterial inflow and runoff initial experience
Radiology, 2001Co-Authors: Geoffrey D Rubin, Laura J Logan, Andrew J Schmidt, Mark C SofilosAbstract:PURPOSE: To assess the patterns of lower extremity arterial inflow and runoff opacification with four-channel multi–detector row computed tomographic (CT) angiography in a cohort of patients with disease warranting imaging of the lower extremity arterial system. MATERIALS AND METHODS: Twenty-four patients with symptomatic lower extremity arterial occlusive or aneurysmal disease underwent imaging with four-channel multi–detector row CT from the supraceliac abdominal aorta through the feet. Transverse Sections were acquired with a 2.5-mm nominal detector width and pitch of 6.0 (3.2-mm effective Section Thickness) following intravenous injection of 174–185 mL of iodinated contrast medium (300 mg iodine per milliliter). In each patient, attenuation measurements were recorded in 16 arterial and 16 venous locations. In 18 patients, two radiologists assessed the detectability and stenosis degree of 21 arterial segments per patient relative to these features at conventional angiography. RESULTS: A mean scannning ...
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aorta and iliac arteries single versus multiple detector row helical ct angiography
Radiology, 2000Co-Authors: Geoffrey D Rubin, Maria C Shiau, Ann N Leung, Stephen T Kee, Laura J Logan, Mark C SofilosAbstract:PURPOSE: To compare single- versus four-channel helical computed tomographic (CT) aortography. MATERIALS AND METHODS: Forty-eight patients with aortic aneurysm or disSection underwent four- and one-channel CT angiography. Scan pairs covered the thoracic inlet to the diaphragm (n = 10) and supraceliac abdominal aorta (n = 19) or thoracic inlet (n = 19) to the femoral arterial bifurcations. For four-channel CT, nominal Section Thickness and pitch were 2.5 mm and 6.0, respectively, and for one-channel CT, 3.0 mm and 2.0 to the infrarenal aorta and 5.0 mm and 2.0 to the femoral arteries. Effective Section Thickness, scanning duration, scanning coverage, dose of iodinated contrast material, and mean aortoiliac attenuation were compared. Data were summarized as speed (coverage/duration), scanning efficiency (speed/Section Thickness), and contrast efficiency (mean aortic attenuation/dose of contrast material). RESULTS: At four- versus one-channel CT, CT angiography was 2.6 times faster, scanning efficiency was 4...
Yahya Paksoy - One of the best experts on this subject based on the ideXlab platform.
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Retrograde flow in the left inferior petrosal sinus and blood steal of the cavernous sinus associated with central vein stenosis: MR angiographic findings
2014Co-Authors: Yahya PaksoyAbstract:BACKGROUND AND PURPOSE: We attempted to identify the cause of abnormal venous flow seen during arterial MR angiography in the inferior petrosal sinus by use of in three female patients (aged 51, 48, and 70 years, respectively). METHODS: Arterial 3D time-of-flight MR angiography was performed with a tilted opti-mized nonsaturating excitation pulse sequence (TR/TE, 31/7; flip angle, 20 degrees; Section Thickness, 65 mm; effective Thickness, 1 mm; number of Sections, 1 to 2); no magnetization transfer pulse sequence was used. Contrast-enhanced 3D MR angiography of the neck was performed with a 3D fast low-angle shot pulse sequence (TR/TE, 4.6/1.8; flip angle, 40 to 45 degrees; Section Thickness, 80 mm; interSection gap, 1.5 mm; acquisition matrix, 180 256; acquisition time, 27 s) on a system with a whole-body coil. RESULTS: In all three patients, 3D time-of-flight MR angiography revealed abnormal vascular signal originating from the left cavernous sinus, continuing through the inferior petrosal sinus, and ending in the proximal internal jugular vein at the jugular bulb level. Abnormal vascular signal at the jugular bulb, sluggish flow and flow-related enhancement in the left internal jugular vein, and signal void in the contralateral jugular vein were noted. Contrast-enhanced delayed-phase M
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retrograde flow in the left inferior petrosal sinus and blood steal of the cavernous sinus associated with central vein stenosis mr angiographic findings
American Journal of Neuroradiology, 2003Co-Authors: Yahya Paksoy, Bulent Oguz Genc, Emine GencAbstract:BACKGROUND AND PURPOSE: We attempted to identify the cause of abnormal venous flow seen during arterial MR angiography in the inferior petrosal sinus by use of in three female patients (aged 51, 48, and 70 years, respectively). METHODS: Arterial 3D time-of-flight MR angiography was performed with a tilted optimized nonsaturating excitation pulse sequence (TR/TE, 31/7; flip angle, 20 degrees; Section Thickness, 65 mm; effective Thickness, 1 mm; number of Sections, 1 to 2); no magnetization transfer pulse sequence was used. Contrast-enhanced 3D MR angiography of the neck was performed with a 3D fast low-angle shot pulse sequence (TR/TE, 4.6/1.8; flip angle, 40 to 45 degrees; Section Thickness, 80 mm; interSection gap, 1.5 mm; acquisition matrix, 180 x 256; acquisition time, 27 s) on a system with a whole-body coil. RESULTS: In all three patients, 3D time-of-flight MR angiography revealed abnormal vascular signal originating from the left cavernous sinus, continuing through the inferior petrosal sinus, and ending in the proximal internal jugular vein at the jugular bulb level. Abnormal vascular signal at the jugular bulb, sluggish flow and flow-related enhancement in the left internal jugular vein, and signal void in the contralateral jugular vein were noted. Contrast-enhanced delayed-phase MR angiography showed stenosis in the left brachiocephalic vein in all patients. CONCLUSION: High signal intensity noted at the inferior petrosal sinus resulted from retrograde flow. Retrograde flow was due to blood stealing from the internal jugular vein toward the cavernous sinus because of venous stenosis in the brachiocephalic vein.
Joh A Janse - One of the best experts on this subject based on the ideXlab platform.
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sinus floor augmentation surgery using autologous bone grafts from various donor sites a meta analysis of the total bone volume
Tissue Engineering Part B-reviews, 2010Co-Authors: Reinoud J Klij, G J Meije, Ewald M Onkhors, Joh A JanseAbstract:BACKGROUND: To date, no studies have been published that evaluated histomorphometric data from a large number of patients while comparing different sites and methods of autologous bone grafting in sinus floor augmentation procedures. A meta-analysis of the English literature from January 1995 till April 2009 was carried out. MATERIALS AND METHODS: PubMed search engine and the following journals were explored: Clinical Oral Implant Research, International Journal of Oral and Maxillofacial Implants, International Journal of Periodontics and Restorative Dentistry, and the Journal of Periodontology. RESULTS: Out of 147 titles, according to our criteria, 25 articles were left for analysis. The majority were prospective controlled studies (21) and 2 randomized clinical trials, 1 pilot study and 1 case series. A reference value of 47% for total bone volume (TBV) was found while using iliac bone grafting as a standard. Use of intraoral bone grafts increases the TBV, with 11% for chin bone and 14% for bone grafted from other intraoral sites. Particulation of the bone graft has a negative effect on the TBV of 18%. Surprisingly, no correlation between TBV and the time of graft healing was found. Histological Section Thickness seemed to be a significant variable, as every micron increase of Section Thickness leads to an increase of 0.4% of TBV. CONCLUSIONS: Bone grafting from the iliac crest resulted in a significantly lower TBV compared with intraoral bone grafting. However, due to the limited availability of intraoral bone to be harvested, iliac grafts still have to be considered the gold standard in augmenting the severely atrophic maxilla.