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Arterial Phase (arterial + phase)

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Medical Sciences100%

Terms modified by Arterial Phase

  • arterial phase image
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    Selected Abstracts

    ENDOSCOPIC NECROSECTOMY UNDER DIRECT VISION AFTER ENDOSCOPIC ULTRASOUND-GUIDED CYSTGASTROSTOMY FOR ORGANIZED PANCREATIC NECROSIS

    DIGESTIVE ENDOSCOPY, Issue 1 2008
    Takeshi Hisa
    A 56-year-old man was referred for an enlarging pancreatic pseudocyst that developed after severe acute pancreatitis with gallstones. Abdominal ultrasound showed a huge cystic lesion with a large amount of solid high echoic components. Arterial phase contrast-enhanced computed tomography scan revealed arteries across the cystic cavity. Stents were placed after endoscopic ultrasound-guided cystgastrostomy; however, the stents were obstructed by necrotic debris, and secondary infection of the pseudocyst occurred. Therefore, the cystgastrostomy was dilated by a dilation balloon, and a forward-viewing endoscope was inserted into the cystic cavity. Many vessels and a large amount of necrotic debris existed in the cavity. Under direct vision, all necrotic debris was safely removed using a retrieval net and forceps. One year after this procedure, there was no recurrence. Our case indicates that peripancreatic fat necrosis can cause exposure of vessels across/along the cystic cavity, and blind necrosectomy should be avoided. [source]

    Improved diagnosis of well-differentiated hepatocellular carcinoma with gadolinium ethoxybenzyl diethylene triamine pentaacetic acid-enhanced magnetic resonance imaging and Sonazoid contrast-enhanced ultrasonography

    HEPATOLOGY RESEARCH, Issue 9 2010
    Natsuko Kawada
    Aim:, Two new imaging modalities have been developed recently that are directed at the focal liver lesions: gadolinium ethoxybenzyl diethylene triamine pentaacetic acid (Gd-EOB-DTPA)-enhanced magnetic resonance imaging (MRI) and Sonazoid contrast-enhanced ultrasonography (CEUS). We investigated the usefulness of these modalities for the diagnosis of small (<2 cm), well-differentiated hepatocellular carcinoma (HCC). Methods:, A total of 15 nodules from 13 patients, which were histologically diagnosed as well-differentiated HCC, were subjected to this study. Lesions that showed hypervascularity in the arterial phase and washout in the portal or late non-hemodynamic phase were regarded as HCC in the dynamic studies of all imaging modalities. Results:, By multidetector computed tomography (MDCT), six of 15 (40%) nodules were diagnosed as HCC. Gd-EOB-DTPA-enhanced MRI diagnosed HCC in nine of the 15 (60%) nodules. Of the nine nodules that were not diagnosed by MDCT, four could be diagnosed by Gd-EOB-DTPA-enhanced MRI. In Sonazoid CEUS, 10 of 15 nodules (67%) were diagnosed as HCC. Four of nine nodules that could not be diagnosed as HCC by MDCT, were diagnosed by Sonazoid CEUS. A total of 11 of the 15 (73%) nodules were diagnosed as HCC by Gd-EOB-DTPA-enhanced MRI and Sonazoid CEUS in addition to MDCT. Conclusion:, Gd-EOB-DTPA-enhanced MRI and Sonazoid CEUS had greater diagnostic value for small, well-differentiated HCC than did conventional MDCT. [source]

    Focal nodular hyperplasia: Central scar enhancement pattern using gadoxetate disodium

    JOURNAL OF MAGNETIC RESONANCE IMAGING, Issue 2 2010
    Adib R. Karam MD
    Abstract Purpose: To illustrate the unusual enhancement pattern of the focal nodular hyperplasia central scar using Gadoxetate Disodium. Materials and Methods: Over a 10-month period, six patients, with a total of seven focal nodular hyperplasia lesions with typical central scar, had MRI of the liver using Gadoxetate Disodium (Eovist, Bayer HealthCare Pharmaceuticals Inc., Wayne, NJ). Four of the six patients had a prior Gadobenate Dimeglumine (Multihance, Bracco Diagnostics Inc., Princeton, NJ) -enhanced MRI of the liver performed within the previous year. The dynamic enhancement pattern of the central scar on the 10 liver MRIs was independently analyzed by two abdominal imaging radiologists who were blinded to the contrast agent used. Results: On the Gadoxetate Disodium-enhanced MRIs and during the arterial phase, 1-min, 2-min, and 3-min delay, none of the central scars demonstrated enhancement. However, all four of the lesions that were previously scanned using Gadobenate Dimeglumine demonstrated typical enhancement after a 3-min delay. Conclusion: On Gadoxetate Disodium-enhanced MRIs of the liver, the central scar of focal nodular hyperplasia lesions does not typically demonstrate delayed enhancement. J. Magn. Reson. Imaging 2010;32:341,344. © 2010 Wiley-Liss, Inc. [source]

    Diagnostic imaging of hepatocellular carcinoma in patients with cirrhosis before liver transplantation

    LIVER TRANSPLANTATION, Issue S2 2006
    Bachir Taouli
    Key Concepts: 1The lack of whole-liver explant correlation has led to an overestimation of the sensitivity of imaging tests for the diagnosis of HCC in the radiological literature. 2Ultrasound is insensitive for the diagnosis of HCC in the cirrhotic liver and should not be used for the detection of focal liver lesions in this setting. 3Although magnetic resonance (MR) imaging is more sensitive than multidetector 3-phase computed tomography (CT) for the diagnosis of regenerative and dysplastic nodules it is probably no better than CT for detection of HCC and has a lower false-positive rate. 4Approximately 10,30% of nodules measuring <2 cm seen only on the hepatic arterial phase at CT or MR imaging represent small HCC and vigilant surveillance imaging is required as interval growth is the best indicator of malignancy. Liver Transpl 12:S1,S7, 2006. © 2006 AASLD. [source]

    Whole-heart coronary magnetic resonance angiography at 3 Tesla in 5 minutes with slow infusion of Gd-BOPTA, a high-relaxivity clinical contrast agent

    MAGNETIC RESONANCE IN MEDICINE, Issue 1 2007
    Xiaoming Bi
    Abstract T1 -shortening contrast agents have been used to improve the depiction of coronary arteries with breath-hold magnetic resonance angiography (MRA). The spatial resolution and coverage are limited by the duration of the arterial phase of the contrast media passage. In this study we investigated the feasibility of acquiring free-breathing, whole-heart coronary MRA during slow infusion of the contrast media (0.3 ml/s) for prolonged blood signal enhancement time. Ultrashort TR (3 ms) and parallel data acquisition were used to allow the whole-heart MRA in approximately 5 min. A newly approved gadolinium (Gd)-based high T1 relaxivity contrast agent, gadobenate dimeglumine ([Gd-BOPTA]2,), was used and coronary MRA was performed on a whole-body 3 Tesla (T) system to improve the signal-to-noise ratio (SNR). Results from eight volunteers demonstrate that this coronary MRA method is capable of imaging the whole heart in 4.5 ± 0.6 min. Major coronary arteries are well depicted with high SNR (42.4 ± 12.5) and contrast-to-noise ratio (CNR; 27.1 ± 7.6). Magn Reson Med 58:1,7, 2007. © 2007 Wiley-Liss, Inc. [source]

    Time-resolved, undersampled projection reconstruction imaging for high-resolution CE-MRA of the distal runoff vessels

    MAGNETIC RESONANCE IN MEDICINE, Issue 3 2002
    J. Du
    Abstract Imaging of the blood vessels below the knee using contrast-enhanced (CE) MRI is challenging due to the need to coordinate image acquisition and arrival of the contrast in the targeted vessels. Time-resolved acquisitions have been successful in consistently capturing images of the arterial phase of the bolus of contrast agent in the distal extremities. Although time-resolved exams are robust in this respect, higher spatial resolution for the depiction of tight stenoses and the small vessels in the lower leg is desirable. A modification to a high-spatial-resolution T1 -weighted pulse sequence (projection reconstruction-time resolved imaging of contrast kinetics (PR-TRICKS)) that improves the through-plane spatial resolution by a factor of 2 and maintains a high frame rate is presented. The undersampled PR-TRICKS pulse sequence has been modified to double the spatial resolution in the slice direction by acquiring high-spatial-frequency slice data only after first pass of the bolus of contrast agent. The acquisition reported in the present work (PR-hyperTRICKS) has been used to image healthy volunteers and patients with known vascular disease. The temporal resolution was found to be beneficial in capturing arterial phase images in the presence of asymmetric filling of vessels. Magn Reson Med 48:516,522, 2002. © 2002 Wiley-Liss, Inc. [source]