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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Surgical and radiologic anatomy 19 (1997), S. 185-188 
    ISSN: 1279-8517
    Keywords: Larynx ; Image processing, computer-assisted ; Adipose tissue
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The purpose of this study was to estimate the volume variability of the preepiglottic and paraglottic space in the normal larynx. In 23 adult patients (12 women, 11 men), a spiral CT acquisition through the larynx was obtained. No laryngeal pathology was observed. The area of the this submucosal fat space was estimated on each slice by semi-automatic segmentation; the volume was calculated by the summation-of-areas technique. The obtained volumes were correlated with body area, body mass index and gender. The mean estimated volume of the preepiglottic and paraglottic space was 2.8 ml (SD 1.7 ml, range 0.7–5.9). No correlation with body mass index (p=0.6), but a significant correlation with body area (p〈0.001) was found. A significant volume difference was present between men (mean 4.5 ml, SD 1.0 ml, range 2.8–5.9) and women (mean 1.4 ml, SD 0.5 ml, range 0.7–2.4) (p〈0,0001). Multiple regression analysis showed gender (p〈0,0001) to be a more important variable than body area (p=0,17) in predicting the volume of the preepiglottic and paraglottic space. In conclusion, the volume of the preepiglottic and paraglottic space appears to be very variable, and should only be analysed with consideration of the gender of the examined subjects.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Surgical and radiologic anatomy 19 (1997), S. 185-188 
    ISSN: 1279-8517
    Keywords: Larynx ; Image processing, computer-assisted ; Adipose tissue
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Le but de cette étude était de déterminer les variations de volume de l'espace pré-épiglottique et para-glottique sur le larynx normal. 23 patients adultes (12 femmes, 11 hommes) ont bénéficié d'une acquisition hélicoïdale sur le larynx en tomodensitométrie. L'aire de l'espace graisseux sous muqueux laryngé était évaluée par une technique de segmentation spatiale semiautomatique. Le volume total correspondant était alors calculé par addition des aires ainsi déterminées sur chaque coupe. Ces volumes étaient corrélés avec la surface corporelle, l'indice de masse corporelle et le sexe. Le volume moyen de l'espace pré-épiglottique et para-glottique était évalué à 2,8 ml (déviation standard 1,7 ml ; extrêmes 0,7–5,9). Il n'existait pas de corrélation avec l'indice de masse corporelle (p=0,6) mais il y avait une corrélation significative avec la surface corporelle (p〈0.001). Il existait une différence de volume significative entre les hommes (moyenne 4,5 ml ; déviation standard 1,0 ml ; extrêmes 2,8–5,9) et les femmes (moyenne 1,4 ml ; déviation standard 0,5 ml ; extrêmes 0,7–2,4 (p〈0,0001). L'analyse des régressions multiples a montré que le critère de sexe (p〈0.0001) était beaucoup plus important que la surface corporelle (p=0,17) pour prédire le volume de l'espace pré-épiglottique et para-glottique. En conclusion, le volume de l'espace pré-épiglottique et para-glottique apparaît être variable et ne devrait être analysé qu'en prenant en considération le sexe des sujets examinés.
    Notes: Summary The purpose of this study was to estimate the volume variability of the preepiglottic and paraglottic space in the normal larynx. In 23 adult patients (12 women, 11 men), a spiral CT acquisition through the larynx was obtained. No laryngeal pathology was observed. The area of the this submucosal fat space was estimated on each slice by semiautomatic segmentation; the volume was calculated by the summation-of-areas technique. The obtained volumes were correlated with body area, body mass index and gender. The mean estimated volume of the preepiglottic and paraglottic space was 2.8 ml (SD 1.7 ml, range 0.7–5.9). No correlation with body mass index (p=0.6), but a significant correlation with body area (p〈0.001) was found. A significant volume difference was present between men (mean 4.5 ml, SD 1.0 ml, range 2.8–5.9) and women (mean 1.4 ml, SD 0.5 ml, range 0.7–2.4) (p〈0,0001). Multiple regression analysis showed gender (p〈0,0001) to be a more important variable than body area (p=0,17) in predicting the volume of the preepiglottic and paraglottic space. In conclusion, the volume of the preepiglottic and paraglottic space appears to be very variable, and should only be analysed with consideration of the gender of the examined subjects.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-0509
    Keywords: Bile ducts, intraluminal tumor ; Cholangiocarcinoma ; Cystadenoma ; Ultrasound, diagnosis of jaundice
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Intraluminal growing tumors of the bile duct are uncommon causes of jaundice. The sonographic appearance of 2 hilar cholangiocarcinomas or Klatskin tumors and a benign extrahepatic biliary cystadenoma is described. Compared to contrast studies of the bile ducts, sonography better defined the intraductal character of the neoplasms. However, the ultrasound appearance did not allow differentiation between the adenocarcinomas and the benign cystadenoma.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Abdominal imaging 14 (1989), S. 345-348 
    ISSN: 1432-0509
    Keywords: Contrast medium ; CT ; Rectum ; Sigmoid ; Staging rectal tumours ; Water
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The use of intrarectally administered plain tap water as a contrast medium for CT scan of the rectum and sigmoid combined with iv iodine contrast medium was prospectively studied in 28 patients. This method allowed correct demonstration of mural wall abnormalities in all patients and therefore represents a simple, inexpensive, and efficient modality for CT study of the rectum and sigmoid.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    European radiology 6 (1996), S. 78-78 
    ISSN: 1432-1084
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-1084
    Keywords: Metalloporphyrins ; Myocardial infaction ; Necrosis ; MRI ; Contrast media
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In previous experiments in tumors we demonstrated that metalloporphyrins are particularly avid for nonviable tumor components. This study was performed to find out wether these agents can be used as MRI contrast agents for the visualization of acute myocardial infarction (MI). A total of 44 rats, 6 normal controls and 38 with occlusive MI (2–24 h old), were used. Gadolinium mesopophyrin (Gd-MP) or manganese totraphenylporphyrin (Mn-TPP) was intravenously injected at doses of 0.1, 0.05, and 0.01 mmol.kg. Three to 24 h after injection, axial and coronal T1-weighted (TR/TE 300/15 ms) spinecho MR images were obtained before and after killing the animals and correlated with triphenyl tetrazolium chloride (TTC) histocemical preparations. The Gd-MP content in infarcted and noninfarcted myocardium was measured using inductively coled plasma atomic emission spectroscopy (ICP-AES) MRI without contrast media could not discern the MI. However, 3–24 h after injection of either Gd-MP or Mn-TPP, the infarcted area was positively stained on MR images. This area matched well witht he negatively TTC-stained area on the heart slices (r = 0.97). The contrast ratios between the infarcted nectrotic myocardium and the noninfarcted regions varied from 150 to 300% depending on the tye of agensts and doses used. Neither false-positive nor false-negative findings were encountered. The metallaporphyrin concentration was more than 10 times higher in the infarcted than in the noninfarcted heart. Metalloporphyrins appear to be promising MRI contrast agents for detection and quantification of necrosis in MI. These preclinical results may open new perspectives in cardiac imaging.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-1084
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A case of lipomeningioma, an uncommon variant of meningioma, is described. Typical radiological features of meningioma, such as broad implantation in the dura, strong contrast enhancement and dural tail were associated with characteristics pointing to fatty content: negative density (−80 HU) on CT as well as short T1 and T2 on MRI.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-1084
    Keywords: Helical CT ; Blood vessels, CT ; Renal arteries, stenosis ; Renal arteries, CT
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The purpose of the study was to investigate whether visual inspection of maximum intensity projection (MIP) images is a reliable method for assessment of the severity of renal artery stenoses (RAS). Therefore, 20 RAS were investigated with helical CT. Native axial images and MIP images were analysed separately or in combination (“two-step method”). A phanton study was performed to investigate the influence of window setting on apparent stenosis severity. Accuracy for diagnosis of 50–69% and 70–99% RAS and the mean inter-observer agreement were 82.5%, 77.5% and 82.5% respectively, using study of MIP images alone, and 100%, 97.5% and 95% using the “two-step method”. The phantom study showed that the apparent severity of vascular stenoses on MIP images depends on the selected window centre values. It is concluded that combined evaluation of both MIP images and native axial images is more reliable than study of MIP images alone for assessing the severity of RAS.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    European radiology 6 (1996), S. 939-940 
    ISSN: 1432-1084
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1432-1084
    Keywords: Key words: Kidney ; transplantation ; Kidney ; neoplasms ; Kidney neoplasms ; diagnosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. A large urothelial tumor was detected by ultrasonography in the dilated collecting system of a well-functioning renal allograft 15 years after transplantation. The tumor was confirmed at computed tomography. Nephrectomy showed a transitional cell carcinoma. The occurrence of malignant tumors in renal allografts is a well known but rare complication.
    Type of Medium: Electronic Resource
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