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  • 1
    Electronic Resource
    Electronic Resource
    Nucleoside diphosphatase activity of germ cells during the cycle of the seminiferous epithelium in the rat testis
    Amsterdam : Elsevier
    Experimental Cell Research 35 (1964), S. 197-200 
    Details
    ISSN: 0014-4827
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0014-4827(64)90082-5
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  • 2
    Electronic Resource
    Electronic Resource
    Orthopedic and interventional applications at low field MRI with horizontally open configuration A review (1997)
    Springer
    Der Radiologe 37 (1997), S. 819-824 
    Details
    ISSN: 1432-2102
    Keywords: Key words MRI • Kinematic MRI • Joint • Interventional ; Schlüsselwörter MRT • Kinematische MRT • Gelenk • Intervention
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die kürzlich eingeführten bildgebenden Systeme mit horizontal offener Konfiguration ermöglichen die Darstellung von Knie, Hüfte oder Schulter über den gesamten Bewegungsbereich, war bisher mit konventionellen MR-Systemen nicht möglich. Für genauere und reproduzierbare Untersuchungen können spezielle Gelenkbewegungsgeräte verwendet werden. Bei der Halswirbelsäule kann die funktionelle NMR-Darstellung im Hinblick auf die Beurteilung der Stabilität der Ligamenta alaria bei Patienten mit Spätfolgen eines Schleudertraumas und bei Patienten mit rheumatoider Arthritis von Nutzen sein, wenn klinisch eine zervikale Myelopathie oder superiore migration des Dens axis vermutet wird. Bei der Schulter kann eine Abduktionsstudie des vollen Bewegungsbereichs bei der Beurteilung eines Auftreffens des Tendo supraspinatus von Nutzen sein. Zur Beurteilung einer patellofemoralen Fehlstellung sollte der Quadrizeps belastet werden, da auf diese Weise die damit verbundene kontrahierende Muskulatur und verbundene Weichteilstrukturen beurteilt werden können. Die Lage des Caput femoris im Verhältnis zum Azetabulum in verschiedenen Stellungen kann beurteilt werden. Scanner mit offener Konfiguration ermöglichen während des Scannens Zugang zum Patienten und gestatten somit eine Überwachung von Interventionsverfahren durch MRT. Diese Interventionen umfassen die Aspirationszytologie/-biopsie sowie verschiedene Drainageverfahren.
    Notes: Summary The recently introduced horizontally open configuration imagers allow imaging of knee, hip or shoulder during whole range of motion, which is not possile in conventional MR imagers. Special joint motion devices can be used to provide accurate and reproducible studies. In cervical spine, functional MR imaging may be useful in evaluating alarligament stability in patients with late sequelae of a whiplash injury, and in patients with rheumatoid arthritis who are clinically suspected of having a cervical myelopathy or superior migration of the odontoid process. In shoulder, full range of motion abduction study may be helpful in assessing the supraspinatus tendon impingement. To evaluate patellofemoral malalignment, quadriceps loading is recommended since associated contracting muscles and related soft tissue structures can be evaluated. The position of the femoral head relative to the acetabulum during different positions can be assessed. Open-configuration scanners provide an access to patients during scanning procedure, and therefore permit interventional procedures to be monitored with MRI. Such interventions include aspiration cytology/biopsy and different drainage procedures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001170050288
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  • 3
    Electronic Resource
    Electronic Resource
    Microvascular supply of the regenerated rat testis following cadmium injury (1970)
    Springer
    Virchows Archiv 349 (1970), S. 229-235 
    Details
    ISSN: 1432-2307
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary The microvascular supply of the rat testis 7 months after cadmium-induced injury was studied microangiographically, combined with either histological or histochemical examination. The regenerating intratesticular blood vessels were seen to grow through the tunica albuginea, especially from the epididymal border of the testis, partly by direct sprouting from the partially recanalized testicular artery. In architectural organization the new vasculature was completely different from the normal one and was restricted mainly to the periphery of the testis. The ingrowth of capillaries into fibrotic and shrunken tubules was demonstrated. The tendency of the contrast medium to leak into the still unorganized tubules suggested that fragile new capillaries were also growing into them. Experimental cryptorchcidism for 4 or 7 months caused no change in the basic organization of the capillary bed and no growth of blood vessels into the seminiferous tubules.
    Notes: Zusammenfassung 7 Monate nach Cadmiumschädigung wurde die Capillarversorgung im Rattenhoden mikroangiographisch, verbunden entweder mit histologischer oder histochemischer Methode, untersucht. Die Blutgefäße, besonders diejenigen am epididymalen Rand des Hodens, hatten z.T. durch Sprossung direkt aus der teilweise rekanalisierten Hodenarterie eine beträchtliche Regeneration erfahren. Die Architektur des „neuen“ Gefäßnetzes, welches hauptsächlich auf die Oberfläche beschränkt war, unterschied sich von der normalen Gefäßarchitektur nicht unerheblich. Im Inneren der fibrotischen und geschrumpften Samenkanälchen konnten wir die Entwicklung von Capillaren nachweisen. Die Neigung zur Extravasation der Kontrastsubstanz im Inneren der Kanälchen, nicht dagegen im intertubulären Gewebe, läßt auf eine kontinuierliche Ausbildung von neuen, kleinsten Capillaren in den Samenkanälchen schließen. Die Ausbildung eines experimentellen Kryptorchismus (über 4 oder 7 Monate) hatte keine Änderung der grundsätzlichen Organisation des Blutgefäßnetzes zur Folge, ebensowenig kam durch sie eine Entwicklung von Blutcapillaren im Inneren der Hodenkanälchen zustande.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00544574
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  • 4
    Electronic Resource
    Electronic Resource
    Age-related MRI changes at 0.1 T in cervical discs in asymptomatic subjects (1994)
    Springer
    Neuroradiology 36 (1994), S. 49-53 
    Details
    ISSN: 1432-1920
    Keywords: MRI ; Cervical spine ; Intervertebral disc ; Disc degeneration ; Ageing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The age-dependent occurrence of cervical degenerative changes was studies using 0.1 T MRI in 89 asymptomatic volunteers aged 9 to 63 years. The degree of DD (disc darkening on T2*-weighted images), disc protrusions and prolapses, narrowing of disc spaces, dorsal osteophytes and spinal canal stenosis were assessed. Abnormalities were commoner in older subjects, 62% of being seen in those over 40 years old. In subjects aged less than 30 years there were virtually no abnormalities. DD was the most common abnormality, seen in 10% of discs; 57% DD was in subjects aged over 40. DD at the C5/6 level was the most common finding. No differences in abnormal findings between males and females was observed, nor any statistically significant association between DD and other abnormalities. Thus, DD begins later age in the cervical spine than in the lumbar region. Asymptomatic degenerative changes are common on MRI in the cervical spine after 30 years of age.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00599196
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  • 5
    Electronic Resource
    Electronic Resource
    Microangiographic filling of the Vascular system of the Brain (1973)
    Springer
    Neuroradiology 6 (1973), S. 83-86 
    Details
    ISSN: 1432-1920
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé A l'aide de la technique de perfusion microangiographique, les auteurs ont étudié les effets de la variation des paramètres suivants sur le remplissage vasculaire du cerveau chez le rat: temps de perfusion, pression, concentration de la suspension de sulfate de barium, température et héparinisation. Les résultats furent évalués par l'étude d'épaisses tranches de microangiogramme et par calcul direct des diamètres sur la même pièce. Les résultats montrèrent que la perfusion prolongée 3 l'aide d'une suspension diluée n'améliore pas de façon significative la perfusion au niveau capillaire. Les meilleurs résultats furent obtenus après quinze minutes de perfusion avec une suspension à 25%, bien que plus de 50% des capillaires n'étaient jamais correctement remplis.
    Abstract: Zusammenfassung Die Gefäßfüllung durch mikroangiographische Perfusionstechnik wurde am Rattenhirn in ihrer Abhängigkeit von folgenden Parametern untershcht: Perfusionszeit, Perfusionsdruck, Konzentration der Barium-Sulfat-Lösung, Temperatur, Heparinisierung. Die Ergebnisse wurden durch optische Untersuchung der Mikroangiogramme und durch Bestimmung der Anzahl der Gefäßquerschnitte am gleichen Untersuchungsobjekt ausgewertet. Es zeigt sich, daß eine langdauernde Perfusion mit verdünnter Lösung die Perfusion des Kapillar-Bereiches nicht signifikant steigert. Die besten Resultate fanden sich nach einer Perfusionsdauer von 15 min mit einer 25% igen Barium-Sulfat-Lösung, obwohl mehr als die Hälfte der Kapillaren keine geeignete Kontrastnittel-Füllung zeigte.
    Notes: Summary The effect of varying the following parameters of the microangiographic perfusion technique of vascular filling of the rat brain was studied: perfusion time, pressure, concentration of barium sulphate suspension, temperature and heparinization. The results were evaluated by visual study of thick section microangiograms and by direct calculation of the capillary cross sections in the same specimen. The results show that prolonged perfusion with a dilute suspension does not improve perfusion to any significant extent at the capillary level. The best results were shown after 15 min perfusion with a 25% suspension, although over 50% of the capillaries were never properly filled.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00399813
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  • 6
    Electronic Resource
    Electronic Resource
    Cross-sectional areas of lumbar muscles after surgical treatment of lumbar disc herniation (1995)
    Springer
    Acta neurochirurgica 133 (1995), S. 7-12 
    Details
    ISSN: 0942-0940
    Keywords: MRI ; back muscle atrophy ; lumbar disc herniation ; microdiscectomy ; percutaneous nucleotomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We assessed in this study the potential development of postoperative muscle atrophy in the operation area in 39 patients treated by either microdiscectomy or percutaneous nucleotomy for lumbar disc herniation. The cross-sectional areas of the lumbar muscles were measured on magnetic resonance images created on the day preceding the operation and 6 months postoperatively. The cross-sections of the lumbar muscles remained unchanged during the observation period in all treated patients indicating that no muscle atrophy had developed in the operation area. Since peroperative tissue trauma may correlate with subsequent muscle denervation and atrophy, this finding may be due to the tissue sparing nature of microdiscectomy and percutaneous nucleotomy, thus encouraging the use of these techniques in the treatment of lumbar disc herniation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01404940
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  • 7
    Electronic Resource
    Electronic Resource
    Combination of microangiography and histochemistry (1970)
    Springer
    Histochemistry and cell biology 22 (1970), S. 79-81 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The enzyme histochemical staining properties of microangiographed tissues were studied with special reference to the contrast filled blood vessels. Colouring of the contrast substance occours when the histochemical methods used involve ammonium sulphide treatment. This may disturb the histochemical reactions of the blood vessels themselves, but in the rest of the tissue all reactions remain undisturbed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00310554
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  • 8
    Electronic Resource
    Electronic Resource
    MR equipment acquisition strategies: low-field or high-field scanners (1997)
    Springer
    European radiology 7 (1997), S. S263 
    Details
    ISSN: 1432-1084
    Keywords: Key words: Magnetic resonance (MR) ; low-field-strength imaging ; Magnetic resonance (MR) ; high-field-strength imaging ; Quality assurance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Magnetic resonance (MR) field strength is one of the key aspects to consider when purchasing MR equipment. Other aspects include the gradient system, coil design, computer and pulse sequence availability, purchase cost, local reimbursement policies, and current opinion within the medical community. Our objective here is to evaluate the decision-influencing aspects of the MR market, with a focus on some specific areas such as high resolution studies, examination times, special techniques, instrumentation, open design magnets, costs and reimbursement policies, academic and industrial interests, contrast media, clinical efficacy, and finally, clinicians' preferences. Certainly the advantage of high-field is a higher signal-to-noise ratio and improved resolution. With a high-field unit, higher spatial resolution images and higher temporal resolution images can be obtained. Typical imaging times needed to produce clinically diagnostic images are about 3 times longer at 0.1 T than at 1.0 or 1.5 T. High-field-related advanced techniques, such as functional imaging, spectroscopy and microscopy, may become clinically useful in the near future. As long as there is an unlimited demand for MR examinations, it appears financially profitable to run a high-field system, despite the associated higher costs. However, if demand for MR becomes saturated, low-field systems will cause less financial strain on the reimbursement organisation and service provider. Recent emphasis on cost containment, the development of interventional techniques, the increased use of MR for patients in intensive care and operating suites, the deployment of magnets in office suites, and the development of new magnet configurations, all favour the supplementary use of low-field systems. Hence, MR units of all field strengths have a role in radiology.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00006906
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  • 9
    Electronic Resource
    Electronic Resource
    The presence of specific proteins, in the absence of many serum proteins, in the rat seminiferous tubule fluid (1971)
    Springer
    Cellular and molecular life sciences 27 (1971), S. 1461-1463 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Die Flüssigkeit in den Hodenkanälchen enthielt mehrere Proteine, die im Serum oder in der Hodenlymphe nicht nachweislich waren. Nur von einigen der Serumproteine waren in der Flüssigkeit der Hodenkanälchen schwache elektrophoretische Bänder zu sehen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02154290
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  • 10
    Electronic Resource
    Electronic Resource
    Age-dependent correlation of low-back pain and lumbar disc degeneration (1996)
    Springer
    Archives of orthopaedic and trauma surgery 116 (1996), S. 106-107 
    Details
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The prevalence of lumbar disc degeneration in subjects suffering from low-back pain (n = 207; age range 10–49 years) and in age-matched asymptomatic controls (n = 216) was investigated by magnetic resonance imaging. The percentage of subjects with degenerated discs increased with age; starting from the age of 15 years, this increase was more rapid in subjects with low-back pain. Concurrently, the number of degenerated discs was higher in the pain group than in controls. Lumbar disc degeneration manifests earlier and in a greater percentage of subjects with low-back pain than in asymptomatic controls.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004020050079
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