The Experts below are selected from a list of 165 Experts worldwide ranked by ideXlab platform
Jae Hyung Park - One of the best experts on this subject based on the ideXlab platform.
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cone beam ct hepatic Arteriography in chemoembolization for hepatocellular carcinoma angiographic image quality and its determining factors
Journal of Vascular and Interventional Radiology, 2014Co-Authors: Jin Wook Chung, Jae Hyung ParkAbstract:Abstract Purpose To analyze image quality and the factors that determine it for cone-beam computed tomography (CT) hepatic Arteriography in chemoembolization for hepatocellular carcinoma (HCC). Materials and Methods From September 2009–December 2010, 399 consecutive patients referred for chemoembolization of HCC were scheduled for cone-beam CT scan. There were 12 patients (3%) excluded because of difficulty with breath-hold. Of the 387 patients who underwent cone-beam CT hepatic Arteriography, 100 patients were ultimately included in the study according to inclusion criteria. Maximum intensity projection images were scored for image quality of each segmental hepatic artery. Potential determining factors for image quality were diaphragmatic motion, portal vein enhancement, and hepatic artery-to-parenchyma enhancement ratio. The flow rate of contrast media, x-ray delay, and location of the catheter tip were also evaluated. Results It was possible to trace at least subsegmental hepatic arteries in 625 of 700 segments (89.3%) on cone-beam CT hepatic Arteriography. Diaphragmatic motion, prominent portal vein enhancement, and low hepatic artery-to-parenchyma enhancement ratio worsened image quality ( P P = .022, and P = .017). Owing to cardiac motion artifacts, image quality of the left lateral segments (S2 and S3) was poorer compared with the remaining hepatic segments (S4–S8). Conclusions In most cases, the quality of cone-beam CT hepatic Arteriography images was good enough to trace subsegmental hepatic arteries at a minimum. Respiratory and cardiac motion, portal vein enhancement, and hepatic artery-to-parenchyma enhancement ratio significantly affected the image quality of cone-beam CT hepatic Arteriography.
Jin Wook Chung - One of the best experts on this subject based on the ideXlab platform.
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cone beam ct hepatic Arteriography in chemoembolization for hepatocellular carcinoma angiographic image quality and its determining factors
Journal of Vascular and Interventional Radiology, 2014Co-Authors: Jin Wook Chung, Jae Hyung ParkAbstract:Abstract Purpose To analyze image quality and the factors that determine it for cone-beam computed tomography (CT) hepatic Arteriography in chemoembolization for hepatocellular carcinoma (HCC). Materials and Methods From September 2009–December 2010, 399 consecutive patients referred for chemoembolization of HCC were scheduled for cone-beam CT scan. There were 12 patients (3%) excluded because of difficulty with breath-hold. Of the 387 patients who underwent cone-beam CT hepatic Arteriography, 100 patients were ultimately included in the study according to inclusion criteria. Maximum intensity projection images were scored for image quality of each segmental hepatic artery. Potential determining factors for image quality were diaphragmatic motion, portal vein enhancement, and hepatic artery-to-parenchyma enhancement ratio. The flow rate of contrast media, x-ray delay, and location of the catheter tip were also evaluated. Results It was possible to trace at least subsegmental hepatic arteries in 625 of 700 segments (89.3%) on cone-beam CT hepatic Arteriography. Diaphragmatic motion, prominent portal vein enhancement, and low hepatic artery-to-parenchyma enhancement ratio worsened image quality ( P P = .022, and P = .017). Owing to cardiac motion artifacts, image quality of the left lateral segments (S2 and S3) was poorer compared with the remaining hepatic segments (S4–S8). Conclusions In most cases, the quality of cone-beam CT hepatic Arteriography images was good enough to trace subsegmental hepatic arteries at a minimum. Respiratory and cardiac motion, portal vein enhancement, and hepatic artery-to-parenchyma enhancement ratio significantly affected the image quality of cone-beam CT hepatic Arteriography.
Kenichi Takayasu - One of the best experts on this subject based on the ideXlab platform.
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Sensitivity of superselective Arteriography for small hepatocellular carcinoma compared with proximal Arteriography and computed tomography during superselective Arteriography.
Japanese Journal of Clinical Oncology, 2002Co-Authors: Kenichi Takayasu, Tetsuo Maeda, Ryoko IwataAbstract:PURPOSE: To obtain successful arterial chemoembolization for hepatocellular carcinoma (HCC), we evaluated the sensitivity of proximal Arteriography, superselective (subsegmental or more distal branch) Arteriography and computed tomography (CT) during superselective Arteriography and assessed the method for the injection of contrast medium. METHODS: Thirty-two patients with 38 HCCs (< or = 5 cm) with a mean diameter of 2.2 cm underwent digital subtraction Arteriography of proximal and superselective Arteriography. In addition, they also had helical CT during superselective Arteriography. The contrast medium was injected with a mechanical injector (n = 6 lesions) or by hand (n = 32) for superselective Arteriography and CT during superselective Arteriography. The amount of contrast medium used for superselective Arteriography and CT during superselective Arteriography with the mechanical injector was 3.5 times and 9 times that with manual injection, respectively. RESULTS: Overall, 31 lesions (81.6%) were detected by proximal Arteriography, 25 (65.8%) by superselective Arteriography and 35 (92.1%) by CT during superselective Arteriography. CT during superselective Arteriography was significantly superior to superselective Arteriography (P = 0.005). In both studies, manual injection of contrast medium had a significantly higher sensitivity than mechanical injection (P = 0.013). CONCLUSION: To detect small HCC, CT during superselective Arteriography showed significantly higher sensitivity than superselective Arteriography. Manual injection of contrast medium was significantly superior to mechanical injection. Therefore, manual injection CT during superselective Arteriography is recommended for accurately targeted, transarterial chemoembolization therapy.
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early hepatocellular carcinoma appearance at ct during arterial portography and ct Arteriography with pathologic correlation
Radiology, 1995Co-Authors: Kenichi Takayasu, Yukio Muramatsu, Hiroyoshi Furukawa, Fumihiko Wakao, Noriyuki Moriyama, Tadatoshi Takayama, Susumu Yamasaki, Michiie Sakamoto, Setsuo HirohashiAbstract:PURPOSE: To use computed tomography (CT) during arterial portography (CTAP) and CT Arteriography to compare the hemodynamic properties of early hepatocellular carcinoma (HCC) with those of small HCC. MATERIALS AND METHODS: Forty-four early HCCs (mean diameter, 1.5 cm) in 37 patients (26 men and 11 women aged 52-74 years; mean age, 59.2 years) were studied. CTAP was performed on 35 early HCCs, CT Arteriography on 20, and both studies on 11. CTAP, CT Arteriography, or both were performed on 90 small HCCs (mean diameter, 2.0 cm) in 57 patients (44 men and 13 women aged 48-71 years; mean age, 61 years). The findings for small HCC were compared with those for early HCC. RESULTS: CTAP depicted 23 early HCCs as hypoattenuating masses and 12 as isoattenuating. CT Arteriography depicted 11 early HCCs as hypoattenuating masses, six as isoattenuating, and three as hyperattenuating. CTAP depicted 85 of 88 small HCCs as hypoattenuating masses and three as isoattenuating. CT Arteriography depicted 13 of 14 small HCCs a...
Ted R Kohler - One of the best experts on this subject based on the ideXlab platform.
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the role of duplex scanning and Arteriography before carotid endarterectomy a prospective study
Journal of Vascular Surgery, 1993Co-Authors: David L Dawson, Eugene R Zierler, Eugene D Strandness, Alexander W Clowes, Ted R KohlerAbstract:Abstract Purpose: This study examines the current role of diagnostic tests done before carotid endarterectomy and the need for routine Arteriography. Methods: We prospectively studied vascular surgeons' decision-making over a 29-month period during which 111 carotid arteries in 103 patients were considered for endarterectomy. For each case the surgeon's management plan was recorded after clinical evaluation and review of the duplex scan findings, but before Arteriography. This plan was later compared with the patient's ultimate clinical management. Results: Of 111 total cases in this period, 17 were excluded from analysis because Arteriography was not done or it was performed before the surgeon's evaluation. Carotid duplex scans were diagnostic in 87 (93%) of the remaining 94 cases. The carotid lesion was incompletely assessed by duplex scanning in seven patients because the disease was not limited to the distal common or proximal internal carotid artery (n = 4); anatomic or pathologic features of the carotid artery interfered with imaging or accurate Doppler assessment (n = 1); or an internal carotid artery occlusion could not be distinguished from a high-grade stenosis (n = 2). When a technically adequate duplex scan showed significant disease of the carotid bifurcation, Arteriography contributed information that affected clinical management in only a single case (1%). This patient had a middle cerebral artery occlusion distal to a high-grade carotid bifurcation stenosis. Conclusions: Clinical assessment and duplex scanning were sufficient for the preoperative evaluation of 93% of the candidates for carotid endarterectomy. Clinical circumstances or atypical duplex scan findings can be used to identify the minority of patients for whom Arteriography is necessary. On the basis of this experience, we have developed practical guidelines for the selective use of Arteriography before carotid endarterectomy. (J V ASC S URG 1993;18:673-83.)
L A Mack - One of the best experts on this subject based on the ideXlab platform.
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hepatic arterial anatomy in transplantation candidates evaluation with three dimensional ct Arteriography
Radiology, 1995Co-Authors: Thomas C Winter, Patrick C Freeny, H V Nghiem, S C Hommeyer, D Barr, A M Croghan, Douglas M Coldwell, Sandra J Althaus, L A MackAbstract:PURPOSE: To assess the utility of three-dimensional (3D) hepatic helical computed tomographic (CT) Arteriography as a replacement for conventional angiography in the evaluation of the arterial anatomy of patients being considered for liver transplantation. MATERIALS AND METHODS: Three-dimensional CT arteriograms were obtained in 115 patients. Seventeen patients also underwent conventional angiography, and 16 patients who did not undergo angiography underwent hepatic transplantation. RESULTS: Among the 3D CT arteriograms, 106 delineated the major arteries that supplied the liver. Nine were considered technical failures. In the 17 patients with angiographic correlation, there was only one marked disagreement with 3D CT Arteriography. In the 16 patients with surgical correlation, no marked discrepancies were found. CONCLUSION: In transplantation candidates, successful 3D CT Arteriography was as accurate as angiography in the assessment of hepatic arterial anatomy. It was also safer, more convenient, and more...
