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  • 1
    Electronic Resource
    Electronic Resource
    Luminescence Studies on In〈sub〉x〈/sub〉Ga〈sub〉1-x〈/sub〉N/GaN Multiple Quantum Wells by Selective Excitation Spectroscopy (2001)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 78-79 (Apr. 2001), p. 297-300 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/26/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.78-79.297.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Ion upflow and downflow at the topside ionosphere observed by the EISCAT VHF radar (2000)
    Springer
    Annales geophysicae 18 (2000), S. 170-181 
    Details
    ISSN: 0992-7689
    Keywords: Ionosphere (particle acceleration; plasma waves and instabilities) ; Space plasma physics (transport processes)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract We have determined the MLT distribution and KpKP dependence of the ion upflow and downflow of the thermal bulk oxygen ion population based on a data analysis using the EISCAT VHF radar CP-7 data obtained at Tromsø during the period between 1990 and 1996: (1) both ion upflow and downflow events can be observed at any local time (MLT), irrespective of dayside and nightside, and under any magnetic disturbance level, irrespective of quiet and disturbed levels; (2) these upflow and downflow events are more frequently observed in the nightside than in the dayside; (3) the upflow events are more frequently observed than the downflow events at any local time except midnight and at any KP level and the difference of the occurrence frequencies between the upflow and downflow events is smaller around midnight; and (4) the occurrence frequencies of both the ion upflow and downflow events appear to increase with increasing KP level, while the occurrence frequency of the downflow appears to stop increasing at some KP level
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-000-0170-3
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  • 3
    Electronic Resource
    Electronic Resource
    Retroperitoneal liposarcoma: sonographic findings (2000)
    Springer
    Abdominal imaging 25 (2000), S. 554-558 
    Details
    ISSN: 1432-0509
    Keywords: Key words: Ultrasound—Retroperitoneum—Neoplasm—Liposarcoma—Fat.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract This study, based on sonographic (US) results of 10 cases with histologically proven retroperitoneal liposarcoma (eight well-differentiated and two pleomorphic types), shows that the presence of fine echogenic lines within the tumor is a useful sign for diagnosing a well-differentiated liposarcoma. Presence of numerous fine fibrous septa in the lipomatous tumor tissue is thought to be responsible for this interesting phenomenon. Of interest is the fact that the direction of these lines changed according to the probe format used: parallel horizontal lines when using a linear probe and concentric lines converging toward the probe when using a sector or curved linear probe. In contrast, pleomorphic liposarcoma does not show this US sign. Knowledge of these US findings is useful for the diagnosis of retroperitoneal liposarcoma.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/s002610000091
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  • 4
    Electronic Resource
    Electronic Resource
    Mesenteric cyst: sonographic findings (2000)
    Springer
    Abdominal imaging 25 (2000), S. 306-310 
    Details
    ISSN: 1432-0509
    Keywords: Key words: Cyst—Doppler—Mesentery—M-mode— Ultrasound.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Background: Mesenteric cyst (MC) is a relatively rare disease, and its sonographic characteristics have not been sufficiently analyzed. Methods: We studied the sonographic findings of eight patients with MC, with attention paid to its size, shape, internal echoes, and especially the presence or absence of lateral shadowing and the mode of back echoes. In four cases, the sound velocity and acoustic impedance of cystic fluid were also measured. The mode of blood flow was evaluated by color Doppler sonography. Results: Six cases showed an oval or comma-shaped mass. Internal echoes were present in six cases, and two of them showed a pseudosolid pattern. In these cases, M-mode sonography confirmed the movement of these internal echoes. Only one case showed a posterior echo enhancement, and no case showed lateral shadowing. Sound velocity measured in four cases was 1515–1537 m/s, with an acoustic impedance of 1.550–1.576 kg/m2/s. No blood flow signals were obtained from the lesion. Conclusion: MC exhibits so many patterns on ultrasound that we should consider the possibility of MC when encountering an avascular oval mesenteric mass.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002610000037
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  • 5
    Electronic Resource
    Electronic Resource
    Chilaiditi syndrome: sonographic findings (2000)
    Springer
    Abdominal imaging 25 (2000), S. 397-399 
    Details
    ISSN: 1432-0509
    Keywords: Key words: Ultrasound—Colon—Gas—Chilaiditi syndrome—Pneumoperitoneum.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Background and methods: Sonographic (US) findings of Chilaiditi syndrome have been rarely reported in the literature. We reviewed 18 cases of Chilaiditi syndrome to pinpoint its US pattern. Results: (1) US showed gas echoes of different sizes superimposed over the entire liver in two cases and over the right hepatic lobe in six cases, leading to a high suspicion of Chilaiditi syndrome. (2) US showed a small gas echo in the hepatodiaphragmatic space, mimicking pneumoperitoneum in eight cases. In this instance, altering the patient's position allowed for confirmation of the lack of a change in the location of the gas echo, unlike cases of pneumoperitoneum. (3) The hepatic surface appeared as a hyperechoic mass in two cases. Conclusion: Knowledge of US patterns of Chilaiditi syndrome helps avoid confusion with pneumoperitoneum or hepatic masses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/s002610000020
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  • 6
    Electronic Resource
    Electronic Resource
    Gallbladder carcinoma: color Doppler sonography (2000)
    Springer
    Abdominal imaging 25 (2000), S. 194-197 
    Details
    ISSN: 1432-0509
    Keywords: Key words: Gallbladder—Carcinoma—Adenomyomatosis—Doppler—Cystic artery.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract This study, based on color Doppler and pulsed Doppler sonographic results of 13 cases with gallbladder carcinoma, eight cases of adenomyomatosis, and eight cases of tumefactive biliary sludge, shows that the presence or absence of blood flow signals helps in the differentiation between gallbladder carcinoma and tumefactive biliary sludge (84.6% sensitivity and 80.0% specificity). However, color Doppler sonography is still not fully capable of distinguishing all gallbladder carcinoma, and a further increase in Doppler sensitivity is mandatory for this purpose. Visualization of high-velocity blood flow within the lesion made gallbladder carcinoma more likely than benign tumor. In contrast, there was no difference in the resistive index between gallbladder carcinoma, adenomyomatosis, and normal subject groups, and the significance of the resistive index is a subject of future study.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002619910044
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  • 7
    Electronic Resource
    Electronic Resource
    Adenosquamous carcinoma of the pancreas: report of two cases (2000)
    Springer
    Abdominal imaging 25 (2000), S. 420-423 
    Details
    ISSN: 1432-0509
    Keywords: Key words: Ultrasound—Doppler—Pancreas—Neoplasm (adenosquamous carcinoma)—Portal vein.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Adenosquamous carcinoma (ASqC) of the pancreas is a rare tumor. We analyzed the radiologic findings and clinical manifestations in two such cases. In both cases (a 51-year-old woman and a 67-year-old man), the portal system was selectively and largely invaded, the superior mesenteric vein in one and the splenic vein in the other, without arterial invasion. Thus, peripancreatic vessels should be carefully observed in patients with ASqC of the pancreas. One case showed an unusual mode of spread. Only a huge metastatic lesion was initially detected, leading to the misdiagnosis of primary malignant mesenteric tumor. Such an unusual growth pattern is also worth noting.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/s002610000059
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  • 8
    Electronic Resource
    Electronic Resource
    Mesenteric panniculitis: sonographic findings (2000)
    Springer
    Abdominal imaging 25 (2000), S. 142-145 
    Details
    ISSN: 1432-0509
    Keywords: Key words: Ultrasound—Doppler—Mesentery—Panniculitis.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Background: Mesenteric panniculitis (MP) is a relatively rare disease, and sonographic (US) and color Doppler findings have been infrequently reported. Methods: We reviewed the clinical data and US and Doppler results of three cases of MP to determine the role and limitations of these techniques. Results: The sole presenting clinical sign was a soft mass. On US the lesion was imaged as a poorly margined echogenic mass with hypoechoic areas. Color Doppler US visualized the nondeviated mesenteric vessels within the mass, which enabled us to perform a safe guided biopsy. Conclusions: US is useful as an initial diagnostic tool, but its results must be interpreted carefully. Color Doppler US is very useful in demonstrating fine vessels and helps in performing a safe needle biopsy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002619902004
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  • 9
    Electronic Resource
    Electronic Resource
    Abdominal involvement in neurofibromatosis 1: sonographic findings (2000)
    Springer
    Abdominal imaging 25 (2000), S. 517-522 
    Details
    ISSN: 1432-0509
    Keywords: Key words: Ultrasound—Doppler—Abdomen—Retroperitoneum—Neurofibroma—Pheochromocytoma— Mesentery.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Background: Neurofibromatosis 1 (NF1) has been studied from many viewpoints, but its abdominal involvement has rarely been reported. Sonography (US) is now the initial diagnostic tool for abdominal exploration, which prompted us to determine the clinical manifestations and US findings of abdominal involvement in NF1. Methods: We analyzed the US findings and clinical data of eight NF1 cases with abdominal involvement. Results: Abdominal involvement included neurofibromatous tumor growth in the liver, mesentery, and retroperitoneum, in addition to mesenteric leiomyomatosis and gastric carcinoma. Color Doppler US was useful not only in detecting blood flows in the lesions but also in preventing hazardous vascular injury during tumor biopsy. Conclusion: A better understanding of the clinical manifestations and US findings of abdominal involvement in NF1 translates into improved NF1 patient care.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/s002610000084
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  • 10
    Electronic Resource
    Electronic Resource
    Liver tumors in children and young patients: sonographic and color Doppler findings (2000)
    Springer
    Abdominal imaging 25 (2000), S. 596-601 
    Details
    ISSN: 1432-0509
    Keywords: Key words: Ultrasound—Doppler—Liver—Neoplasm —Children.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Background: Liver tumors are a relatively rare pathologic condition in children and young patients. The aim of the present study was to categorize the sonographic (US) and color Doppler results of liver tumors in these patients. Methods: We retrospectively reviewed the US findings of 23 such cases: malignant tumor (13 cases)—hepatoblastoma (four cases), hepatocellular carcinoma (HCC; four cases), and hepatic metastasis (five cases); benign tumor (10 cases)—hepatocellular adenoma (four cases), focal nodular hyperplasia (two cases), mesenchymal hamartoma (two cases), cystadenoma (one case), and hemangioendothelioma (one case). Results: There was no specific US findings for each tumor type. HCC usually developed on a normal liver and was imaged as multiple nodules. Color Doppler US helped in differentiating multiple metastatic nodules (hypovascular) from multiple HCC nodules (hypervascular). Presence of intratumoral cystic areas was usually suggestive of benign tumors. Follow-up US was useful for detecting small nodules in high-risk groups (congenital biliary atresia, glycogen storage disease). Color Doppler US helped in diagnosing portal thrombus or intratumoral shunt. Conclusion: Although there were no highly specific findings, US and color Doppler results contributed, to a certain degree, to the diagnosis of liver tumors in children and young adults by showing intratumoral cystic areas or vascularity. RID="" ID="" 〈E5〉Correspondence to:〈/E5〉 M. Sato
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/s002610000070
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