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  • 11
    Electronic Resource
    Electronic Resource
    Multivariate analysis of the adjustment of the colour Duplex unit for the differential diagnosis of lymph node alterations (1999)
    Springer
    European radiology 9 (1999), S. 1445-1450 
    Details
    ISSN: 1432-1084
    Keywords: Key words: Ultrasonography ; Colour Doppler ; Lymphatic system ; Neoplasms ; Lymph nodes ; Blood supply
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Intranodal angioarchitecture was used as criterion for the differential diagnosis of lymph node alterations by colour duplex sonography. The influence of the adjustment of the duplex unit on the diagnostic accuracy and on the rate of lymph nodes with detectable intranodal flow signals was tested. A total of 243 superficial lymph nodes in 127 patients were included in a retrospective study. Diagnoses were approved by histopathology (n = 173) or clinical follow-ups (n = 70 reactive lymph nodes). The intranodal angioarchitecture and sonomorphology were assessed. We used nonparametric discriminant analysis in order to define appropriate settings for transducer frequency, flow mode, power and threshold which result in the best diagnostic quality. Of the lymph nodes, 87 % displayed flow signals using a threshold of ≥ 13 and the flow modes low or medium. Vascularisation was detected only in 47 % of the nodes assessed with different adjustments. Diagnostic accuracy dropped from 94 to 68–84 % if threshold was 〈 13 or power was less than –11 dB. An insufficient adjustment of the colour duplex unit decreases the chance of detecting intranodal flow signals and impairs the diagnostic quality of colour duplex sonography. Flow mode, power and threshold are the most important parameters which have to be adjusted properly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003300050868
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  • 12
    Electronic Resource
    Electronic Resource
    Current value of double-contrast pharyngography and of computed tomography for the detection and for staging of hypopharyngeal, oropharyngeal and supraglottic tumors (1999)
    Springer
    European radiology 9 (1999), S. 1843-1850 
    Details
    ISSN: 1432-1084
    Keywords: Key words: Pharynx ; Larynx ; Neoplasms ; Radiography ; CT ; Deglutition disorders
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. In light of recent endoscopic techniques the current value of double-contrast pharyngography (DCP) and of CT for detection and staging of hypo-, oropharyngeal, and supraglottic tumors is evaluated. The DCP of 151 patients and CT obtained from 99 of these patients were retrospectively analyzed in a double-blinded manner. We used a standard protocol which comprised all relevant anatomical subregions. Results were compared with direct microlaryngoscopy (DL), indirect laryngoscopy (IL), and post-operative histopathological findings. Sensitivity and specificity of DCP was 75.0 % and 86.7 %, respectively. The DCP and IL techniques together yielded a higher sensitivity (96.7 %) than each method separately. Sensitivity and specificity of CT was 87.5 and 100 %, respectively. In 74.7 % CT provided correct staging. Subregional analysis revealed that the results of DCP and CT depend highly on the localization of the tumor. Our results indicate that DCP represents an important screening method for diagnosing hypo-, oropharyngeal, and supraglottic tumors to complete IL and DL. We show that CT is a reliable method for preoperative staging, although small superficial tumors may occasionally be missed by this method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003300050933
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  • 13
    Electronic Resource
    Electronic Resource
    Age- and gender-specific differences in left and right ventricular cardiac function and mass determined by cine magnetic resonance imaging (2000)
    Springer
    European radiology 10 (2000), S. 438-442 
    Details
    ISSN: 1432-1084
    Keywords: Key words: Heart – Magnetic resonance imaging – Heart function tests – Cardiac volume
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. We examined possible age- and gender-specific differences in the function and mass of left (LV) and right (RV) ventricles in 36 healthy volunteers using cine gradient-recalled echo magnetic resonance imaging. Subjects were divided into four groups (nine men and nine women in each): men aged under 45 years (32 ± 7), women aged under 45 (27 ± 6), men aged over 45 (59 ± 8), and women aged over 45 (57 ± 9). Functional analysis of cardiac volume and mass and of LV wall motion was performed by manual segmentation of the endocardial and epicardial borders of the end-diastolic and end-systolic frame; both absolute and normalized (per square meter body surface area) values were evaluated. With age there was a significant decrease in both absolute and normalized LV and RV chamber volumes (EDV, ESV), while LV and RV masses remained unchanged. Gender-specific differences were found in cardiac mass and volume (for men and women, respectively: LV mass, 155 ± 18 and 110 ± 16 g; LV EDV, 118 ± 27 and 96 ± 21 ml; LV ESV, 40 ± 13 and 29 ± 9 ml; RV mass, 52 ± 10 and 39 ± 5 g; RV EDV, 131 ± 28 and 100 ± 23 ml; RV ESV, 53 ± 17 and 33 ± 15 ml). Normalization to body surface area eliminated differences in LV volumes but not those in LV mass, RV mass, or RV function. Functional parameters such as cardiac output and LV ejection fraction showed nonsignificant or only slight differences and were thus largely independent of age and gender. Intra- and interobserver variability ranged between 1.4 % and 5.9 % for all parameters. Cine magnetic resonance imaging thus shows age- and gender-specific differences in cardiac function, and therefore the evaluation of cardiac function in patients should consider age- and gender-matched normative values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003300050072
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  • 14
    Electronic Resource
    Electronic Resource
    Intralobar lung sequestration with systemic coronary arterial supply (1999)
    Springer
    European radiology 9 (1999), S. 1324-1326 
    Details
    ISSN: 1432-1084
    Keywords: Key words: Intralobar lung sequestration ; Bronchiectases ; Right coronary artery
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Pulmonary sequestration is a rare anomaly. An accurate pre-operative evaluation of its vascular supply is essential for the surgeon's operative approach. We describe here an intrapulmonary sequestration with vascular arterial supply via the left circumflex and the right coronary artery. This case demonstrates that if aortography is unrevealing, then a coronary source should be considered in the preoperative search for the arterial supply to a pulmonary sequestration. Moreover, pulmonary sequestration should be listed in the differential diagnosis of aberrant coronary arteries.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003300050841
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  • 15
    Electronic Resource
    Electronic Resource
    Spiral CT angiography of renal arteries: comparison with angiography (1999)
    Springer
    European radiology 9 (1999), S. 546-551 
    Details
    ISSN: 1432-1084
    Keywords: Key words: Hypertension ; renal ; Renal angiography ; Renal arteries ; stenosis or obstruction ; Computed tomography (CT) ; helical technology ; Computed tomography (CT) ; three-dimensional
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. A prospective study was carried out to determine the accuracy of spiral CT angiography (CTA) in the detection of renal artery stenosis (RAS). Eighty-two patients with arterial hypertension underwent CTA and digital subtraction angiography (DSA) to exclude RAS. For CTA a contrast medium bolus of 100–150 ml (flow rate 3 ml/s) was injected. A 24 or 40 s CTA was started at the origin of the superior mesenteric artery after a delay time determined by test bolus injection (collimation = 2 mm, pitch = 1/1.5). For stenosis detection transverse images supported by maximum intensity projections (MIP) or multiplanar reconstruction projections were used. Of 197 renal arteries examined (including 33 accessory arteries), 34 RAS were visualized using DSA. With CTA, one hemodynamic RAS was missed and one additional hemodynamic RAS was found. Sensitivity/specificity was calculated to be 94 %/98 %. For hemodynamically relevant RAS (〉 50 %) the sensitivity/specificity was 96 %/99 %. CTA additionally depicted five adrenal masses. The high accuracy rate of RAS detection thus allows the use of CTA as a screening method in patients with arterial hypertension to exclude a renovascular cause.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003300050707
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  • 16
    Electronic Resource
    Electronic Resource
    Asymptomatic aneurysm of the proximal right subclavian artery: a rare ultrasound diagnosis (2000)
    Springer
    European radiology 10 (2000), S. 459-461 
    Details
    ISSN: 1432-1084
    Keywords: Key words: Aneurysm – Right subclavian artery – Ultrasound – Duplex studies – MR angiography – Digital subtraction angiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. True aneurysms of otherwise normal subclavian arteries are uncommon peripheral vascular anomalies. Most patients with subclavian artery aneurysms are symptomatic by presenting neurologic signs. We report a young woman who had an asymptomatic true aneurysm of the right subclavian artery assumed to be of congenital origin. This case is unique in that the aneurysm was in the extremely rare anatomic location of the right supraclavicular fossa between the origins of the right subclavian artery and the vertebral artery. Aneurysms of the right subclavian artery may represent a potential pitfall in conventional gray-scale ultrasound of the neck particularly the supraclavicular fossa. Differential diagnosis includes cervical cyst, pharyngo-esophageal diverticulum, vascular anomalies, struma, enlarged lymph node, as well benign or malignant neoplasms. Color duplex ultrasound should be performed as the method of choice for further analysis of suspected aneurysms. In this report the role of B-mode ultrasound and color duplex ultrasound is discussed in relation to digital subtraction- and MR angiography in confirmation of the diagnosis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003300050076
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  • 17
    Electronic Resource
    Electronic Resource
    Exact measurement of vascular lumina in digital subtraction arteriography (DSA) during stent implantations and percutaneous transluminal angioplasty (PTA) (1992)
    Springer
    European radiology 2 (1992), S. 209-213 
    Details
    ISSN: 1432-1084
    Keywords: Digital subtraction arteriography ; Quantitative measurements ; Calibration catheter
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract There are inherent difficulties in using high-resolution DSA in interventional radiology for measuring vascular luminal diameter since enlargement ratios are not constant. We present a system that permits accurate determination of vascular lumen diameters by means of a special angiographic catheter with pre-defined marking points. The accuracy of this measuring method was explored in tests using phantoms. In vivo practicability of the method was proved in PTA and stent implantations in 39 patients. This method with a maximum error of measurement of 5% appears to provide adequate safety in the choice of suitable dilating balloons and stents in interventional vascular procedures. In follow-up, it permits the accurate measurement of neo-intimal thickness.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00595832
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  • 18
    Electronic Resource
    Electronic Resource
    ESTIMATION OF ZINC AND COPPER IN RAW AND COOKED LEGUMES: AN INTERLABORATORY STUDY OF ATOMIC ABSORPTION AND X-RAY FLUORESCENCE SPECTROSCOPY (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 44 (1979), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Zinc and copper are important nutrient elements in dry beans. The precision and accuracy of two instrumental methods, atomic absorption and x-ray fluorescence spectroscopy, were compared and evaluated for the estimation of total copper and zinc in raw and cooked legume products. After calibration against National Bureau of Standards reference samples, corrected values obtained by both methods were essentially identical and in good agreements with values reported in the literature for random, analogous materials. Cooked standard and quick-cooking beans both contained nutritionally significant amounts, but less zinc and copper than inedible, raw, dry beans.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1979.tb09122.x
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  • 19
    Electronic Resource
    Electronic Resource
    Single crystal ^2^0^5Tl NMR in the normal and superconducting state of the high-T"c superconductor Tl"2Ba"2CaCu"2O"8 - A study of the Knight and chemical shift
    Amsterdam : Elsevier
    Physica C: Superconductivity and its applications 175 (1991), S. 12-16 
    Details
    ISSN: 0921-4534
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0921-4534(91)90229-R
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  • 20
    Electronic Resource
    Electronic Resource
    Heavy-ion potentials for ellipsoidally deformed nuclei and application to the system ^2^3^8U + ^2^3^8U
    Amsterdam : Elsevier
    Nuclear Physics, Section A 388 (1982), S. 381-401 
    Details
    ISSN: 0375-9474
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9474(82)90421-3
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