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  • 11
    Digitale Medien
    Digitale Medien
    Neoplasms containing normal hepatic vessels: imaging features (2000)
    Springer
    Abdominal imaging 25 (2000), S. 602-606 
    Details
    ISSN: 1432-0509
    Schlagwort(e): Key words: Liver-neoplasms—CT-liver—Neoplasms— Liver-vessels.
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Background: We investigated the incidence and imaging features of hepatic neoplasms containing normal hepatic vessels. Methods: Among 3183 patients with various hepatic neoplasms, we found nine patients with normal hepatic vessels traversing hepatic neoplasms. The presence of mass effect on the vessel traversing hepatic neoplasms was evaluated. Other suggestive findings of neoplasms such as altered hepatic contour, portal vein thrombosis, mass effect on extratumoral vessel, and bile duct dilatation were analyzed. Results: Thirteen hepatic vessels (nine hepatic veins and four portal veins) extended through hepatic neoplasms in nine patients. Undisturbed hepatic vessels within the neoplasms were found in five patients with either primary or metastatic hepatic neoplasm. In one patient with undisturbed hepatic vessels within the neoplasm, there were no associated abnormal findings such as biliary dilatation, change of hepatic contour, or any changes involving the vessels external to neoplasms. Conclusion: Although rare, various primary and secondary hepatic neoplasms can have normal hepatic vessels passing through them without mass effect. However, correct diagnosis in most neoplasms would be possible with careful examination of associated findings. RID="" ID="" 〈E5〉Correspondence to:〈/E5〉 J. K. Han
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/s002610000049
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  • 12
    Digitale Medien
    Digitale Medien
    Visualization of high-speed gas jets and their airblast sprays of cross-injected liquid (1999)
    Springer
    Experiments in fluids 27 (1999), S. 102-106 
    Details
    ISSN: 1432-1114
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract  A planar and instantaneous visualization study of high-speed gas jets and their airblast sprays was performed to qualitatively examine the different atomization performances of different gas nozzles. For the visualization of high-speed gas jets (with no liquid injected), Nd:YAG pulsed laser sheets imaged the clustered vapor molecules in the Rayleigh range (d≪λ), condensed from the natural humidity during the isentropic gas expansion through a nozzle. This method visualized both underexpanded sonic gas jets from a converging nozzle (SN-Type) and overexpanded supersonic gas jets from a converging-diverging nozzle (CD-Type). When liquid is cross-injected, the same laser sheet images the spray droplets of relatively large sizes (d?λ). The present visualization results show that the SN-Type nozzle develops a wider spray than the CD-Type nozzle, quite probably because the SN-Type nozzle has a wider gas jet (in the absence of liquid) than the CD-Type. Also, the wider spray of the SN-Type nozzle lowers the probability of droplet coalescence and generates finer sprays compared to the CD-Type nozzle. These visualization results qualitatively agree with the previous quantitative finding of the different atomization characteristics of the two types of nozzles (Park et al. 1996).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s003480050334
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  • 13
    Digitale Medien
    Digitale Medien
    Dysplastic nodules of the liver: imaging findings (1999)
    Springer
    Abdominal imaging 24 (1999), S. 250-257 
    Details
    ISSN: 1432-0509
    Schlagwort(e): Key words: Liver—Neoplasms—US—CT—MR.
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Background: To verify characteristic features of hepatic dysplastic nodules at different imaging modalities. Methods: Twenty-eight patients with 37 dysplastic nodules of the liver (0.8–3.0 cm) underwent sonography (28 patients), computed tomography (CT; 24 patients), magnetic resonance (MR; 11 patients), and angiography (12 patients). Each nodule was analyzed for echogenicity, attenuation, signal intensity, and vascularity. Results: Echogenicity of nodules was high in 16 (43%), homogeneous in two (6%), and low in 19 (51%) of 37 nodules. Attenuation of nodules was high in one (7%), homogeneous in four (26%), and low in 10 (67%) of 15 nodules on the arterial-phase CT images; homogeneous in five (33%) and low in 10 (67%) of 15 nodules on the portal-phase CT images; and high in four (17%), homogeneous in six (26%), and low in 13 (57%) of 23 nodules on the delayed-phase CT images. Signal intensity of nodules was high in 15 (94%) and homogeneous in one (6%) of 16 nodules on T1-weighted MR images and was homogeneous in seven (44%) and low in nine (56%) of 16 nodules on T2-weighted MR images. Vascularity of nodules was avascular in 14 (88%) and slightly vascular in two (12%) of 16 nodules. Conclusions: Hepatic dysplastic nodules show diverse imaging characteristics with different imaging techniques; however, common imaging findings of hepatic dysplastic nodules are low echo, low attenuation, and high, low, or homogeneous intensity on T1- and T2-weighted MR, and avascularity.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002619900490
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  • 14
    Digitale Medien
    Digitale Medien
    Gastric adenoma with atypical appearance: findings on double-contrast barium study with histopathologic correlation (2000)
    Springer
    Abdominal imaging 25 (2000), S. 124-128 
    Details
    ISSN: 1432-0509
    Schlagwort(e): Key words: Stomach—Atypical—Adenoma—Depressed—Flat—Double-contrast barium study.
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Background: To describe the radiologic findings of nonpolypoid gastric adenomas and to correlate them with pathologic findings. Methods: During a 9-year period, we reviewed 49 pure gastric adenomas in 43 patients with positive radiologic findings. Of these adenomas, seven with atypical polypoid appearance were retrospectively included in the study. We reviewed these findings with double-contrast barium study and correlated them with the pathologic findings. Results: Of seven nonpolypoid adenomas, four were depressed and three were flat at pathologic examination. All were diagnosed as early gastric carcinoma (five as type IIc, one as type IIb, one as type IIa + IIc) in upper gastrointestinal series. Three were located in the gastric angle, two in the lower body, and two in the antrum. Size ranged from 10 mm to approximately 25 mm (mean = 15 mm). Six lesions had nodular surface and five had convergency of the mucosal folds. A shallow depressed area was seen in six lesions. Conclusions: A considerable proportion of gastric adenomas presents as a depressed or flat lesion on double-contrast barium study because of histologic characteristics of decreased subjacent mucosa. Because the nonpolypoid adenoma has a greater potentional for malignancy, more precaution is needed during the follow-up of this uncommon lesion.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002619910029
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  • 15
    Digitale Medien
    Digitale Medien
    Preoperative evaluation of Klatskin tumor: accuracy of spiral CT in determining vascular invasion as a sign of unresectability (2000)
    Springer
    Abdominal imaging 25 (2000), S. 500-507 
    Details
    ISSN: 1432-0509
    Schlagwort(e): Key words: Bile ducts—Bile ducts, CT—Bile ducts, neoplasm.
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Background: To assess the accuracy of spiral computed tomography (CT) in predicting the resectability of Klatskin tumor as determined by vascular invasion. Methods: Twenty-one consecutive patients with Klatskin tumor who had undergone laparotomy were included in this study. The preoperative thin-section (5-mm-thick) spiral CT scans of these patients were assessed for the surgical resectability of tumor by evaluating the vascular invasion. The criterion for vascular invasion indicating unresectability was the tumoral invasion of the proper hepatic artery or main portal vein or simultaneous invasion of one side of the hepatic artery and the other side of the portal vein. Results: All nine patients with tumors thought to be unresectable on the basis of CT findings had tumors that were unresectable at surgery (positive predictive value, 100%). Of 12 patients with tumors thought to be resectable, six had resectable tumors (negative predictive value, 50%). Spiral CT failed to detect small hepatic metastasis (n= 1), lymph node metastasis (n= 1), extensive tumor (n= 2) and variation of bile duct (n= 2), which precluded surgical resection. Conclusion: Spiral CT is a reliable method for detecting vascular invasion and unresectable tumors. However, it has limitations in detecting variations of the bile duct or the intraductal extent of tumor.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/s002610000081
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  • 16
    Digitale Medien
    Digitale Medien
    MR cholangiopancreatography: comparison between half-Fourier acquisition single-shot turbo spin-echo and two-dimensional turbo spin-echo pulse sequences (1998)
    Springer
    Abdominal imaging 23 (1998), S. 398-403 
    Details
    ISSN: 1432-0509
    Schlagwort(e): Key words: Bile ducts, MR—Magnetic resonance (MR), comparative studies—Magnetic resonance (MR), half-Fourier imaging.
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract. Background: To compare half-Fourier acquisition single-shot turbo spin-echo (HASTE) magnetic resonance cholangiopancreatography (MRCP) with two-dimensional turbo spin-echo (2D TSE) MRCP for imaging pancreatobiliary diseases. Methods: Twenty-seven patients with biliary or pancreatic disease underwent MRCP on a 1.0-T scanner with a body phased-array coil. A T2-weighted HASTE sequence (18 s) and a T2-weighted 2D TSE sequence (45 s) were used during a breath-hold by the patient. The source images and maximum intensity projection images of both sequences were reviewed independently by two radiologists. Results: Motion artifacts were more severely pronounced with 2D TSE sequences than with HASTE sequences (p 〈 0.001). All obstructions and their sites were accurately identified with both sequences. Filling defects (calculi) in bile ducts were identified in all 22 segments (100%) with HASTE-MRCP, whereas calculi in 19 of 22 segments (86%) were identified with 2D TSE-MRCP (p= 0.25). Three missed sites on 2D TSE-MRCP were intrahepatic bile ducts. Conclusions: HASTE-MRCP is superior to 2D TSE-MRCP in terms of detecting motion artifacts and visualization of the pancreatic ducts. HASTE-MRCP is comparable to 2D TSE-MRCP for visualization of the biliary ducts and their obstruction and is superior to 2D TSE-MRCP for identification of calculi in intrahepatic bile ducts.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002619900368
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  • 17
    Digitale Medien
    Digitale Medien
    Hepatic Hemangioma: Contrast-Enhancement Pattern during the Arterial and Portal Venous Phases of Spiral CT (1999)
    Springer
    Abdominal imaging 24 (1999), S. 262-266 
    Details
    ISSN: 1432-0509
    Schlagwort(e): Key words: Liver, CT—Liver, neoplasm—Hemangioma.
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract The objective of the present study was to evaluate contrast-enhancement patterns of hepatic hemangioma according to size during hepatic arterial (30-s delay) and portal venous (65-s delay) phases of spiral computed tomography (CT). During a 10-month-period, 73 patients with 118 hemangiomas underwent two-phase spiral CT examination. The enhancement patterns of tumors were divided into four types based on the attenuation of surrounding liver parenchyma: peripherally nodular high, uniform high, iso, and low. The diameter of the tumors were 〈10 mm (n= 39), 11–20 mm (n= 33), and 〉21 mm (n= 46). Overall, the most common enhancement patterns of hemangioma were peripherally nodular high (66/118, 55.9%) during the arterial and portal venous phases. The second most common contrast-enhancement patterns of hemangioma were uniform high (15/118, 12.7%) during the arterial and portal venous phases. In tumors smaller than 20 mm, 11 (9.3%) had low-low attenuation and two (1.7%) had iso-low attenuation during the arterial and portal venous phases, respectively. In conclusion, at two-phase spiral CT, the most common contrast-enhancement patterns of hemangioma are peripherally nodular high and/or uniform high during the arterial and portal venous phases. However, hemangiomas smaller than 2 cm may have atypical enhancing patterns including low and iso-attenuation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002619900492
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  • 18
    Digitale Medien
    Digitale Medien
    MR imaging of advanced gastric cancer: comparison of various MR pulse sequences using water and gadopentetate dimeglumine as oral contrast agents (2000)
    Springer
    Abdominal imaging 25 (2000), S. 7-13 
    Details
    ISSN: 1432-0509
    Schlagwort(e): Key words: Stomach—Gastric cancer—Magnetic resonance imaging—Contrast media.
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Background: To evaluate clinical usefulness of oral contrast agents (gadopentetate dimeglumine and water) and to assess proper magnetic resonance (MR) imaging in evaluating advanced gastric cancer (AGC) by comparing different MR imaging techniques. Methods: Fifteen patients with AGC were imaged with a 1.0-T MR imager and body-array coil. All patients underwent surgery or laparascopic biopsy. Fast low-angle shot (FLASH), half-Fourier single-shot turbo spin-echo (HASTE), and true fast imaging with steady-state precession time (FISP) images were obtained after ingestion of 900 mL tap water in each patient, followed by postcontrast FLASH images after additional ingestion of gadopentetate dimeglumine (Gd-DTPA). Qualitative analysis including T-staging of AGC and scoring of imaging quality and quantitative analysis were performed prospectively. Results: In image quality and diagnostic accuracy of T-staging, FLASH imaging showed results slightly superior to those of other imaging modalities, and there was no great difference between using water and Gd-DTPA as an oral contrast agent. As for cancer-to-gastric lumen contrast-to-noise ratio (CNR), HASTE and true FISP imaging were superior to FLASH imaging with Gd-DTPA (p 〈 0.0001). In cancer-to-pancreas CNR, FLASH imaging without Gd-DTPA showed the best result. Conclusions: The use of Gd-DTPA as a positive contrast agent may not be imperative, and T1-weighted FLASH imaging in combination with true FISP imaging with ingestion of tap water can be very useful in evaluating AGC with MR imaging.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/s002619910002
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  • 19
    Digitale Medien
    Digitale Medien
    Chemical and electron microscopic studies of factors associated with the release of penicillinase from Staphylococcus aureus (1979)
    Springer
    Antonie van Leeuwenhoek 45 (1979), S. 581-593 
    Details
    ISSN: 1572-9699
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The effect of various factors such as sodium chloride, sodium citrate, pH, buffers, and enzymatic and physical disruption of cells on the release of penicillinase by Staphylococcus aureus ATCC 14458 was investigated. Penicillinase was measured at selected time intervals from supernates of cultures grown in Antibiotic Medium 3 broth containing various concentrations of salts or buffers or from supernates of cultures treated with lysostaphin and subsequently disrupted by French press treatment. Incubation of cells with media containing either sodium chloride (5, 10, and 15%), sodium citrate (5 and 10%), or organic buffers (Tris-HC1, 2.5, 5.0, and 7.5%; BES, 10 and 20%) resulted in a significant stimulation of the release of penicillinase when compared to control cells. It was also observed that pH 7.0–7.5 was optimal for penicillinase activity and release. From studies of enzymatic and mechanical disruption of cells, it was observed that an increase in ionic strength of the suspending medium to certain optimal levels appeared to stimulate the conversion of penicillinase to an extracellular form. Electron microscopic studies revealed that a large number of mesosomal vesicles seemed to be present in cells incubated for 4 hours in media containing various concentrations of sodium chloride. It is proposed that either appearance of vesicles or convolution of cell membrane, which may be caused by further synthesis of new membrane, is involved in stimulation of the synthesis and release of membrane-bound penicillinase.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00403658
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  • 20
    Digitale Medien
    Digitale Medien
    Preparations and properties of polyurethane aqueous dispersion from uncatalyzed systems of H12MDI, PTAd/bisphenol A polyol, and DMPA (1991)
    Springer
    Colloid & polymer science 269 (1991), S. 889-894 
    Details
    ISSN: 1435-1536
    Schlagwort(e): Polyurethaneionomer ; H 12MDI ; PTAd ; DMPA ; particlesize ; mechanicalproperties
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: Abstract Aqueous dispersions of polyrethane (PU) containing ionic and nonionic hydrophilic segments were prepared in a prepolymer mixing process using substantial amount of solvent. The acid groups were neutralized with tertiary amine, and chain extension in aqueous media was carried out with triethylene tetramine. Average particle size and particle size distribution of the dispersion, and mechanical and viscoelastic properties of the emulsion cast films were determined.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00657305
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