Frontiers in European Radiology by J. Buck (auth.), Professor Dr. Albert L. Baert, Professor

By J. Buck (auth.), Professor Dr. Albert L. Baert, Professor Dr. Erik Boijsen, Professor Dr. Walter A. Fuchs, Professor Dr. Friedrich H. Heuck (eds.)

Considerable advances were revamped the years within the learn of the physiological and diseased states of the kidney, in order that our present-day diagnostic functions allow not just morphological, but additionally sensible inter-relations to be registeres. step one towards functionality diagnostics used to be fascinated by the creation of kymography. This was once followd through serial angiography, after which got here cineradiography which made simultaneous morphological and useful radiological examinations possible. 2 body structure of Kidney 2. 1 Hemodynamics of Renal Arteries due to the negligible vascular elasticity of the rani arteries, the diameter version ensuing inside one cardiac motion is ready 1 % [14]; yet with those diversifications being misplaced within the accuracy of size, although, blood movement will be in comparison to the circulate of liquid in inflexible tubes. In a inflexible tube, the rate of the person debris of liquid varies when it comes to its distance from the tube axis. lower than general situations, a laminar move prevails within the arteries, the blood flowing parallel to the vascular wall in coaxial cylindrical layers. the rate is said the following as v. The circulate fee, I, stands for the ratio of the amount of liquid, V, flowing via a go portion of a tube to the time, t, required for this, or additionally for the manufactured from move speed v and the go component to the tube q: 1= Llv: Llt and that i = v x q.

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In: Anwendung densitometrischer thermischer und radiologischer Methoden in der Klinik. 2. Oxymetrie-Symposium 1968. Thieme, Stuttgart, p 64 179. RutishauserW (1973) DurchfluBmessungen im intakten Organismus. In: Heuck F (ed) Densitometrie in der Radiologie. Thieme, Stuttgart 180. Rutishauser W, Krayenbuhl HP, Wirz P, Veragut UP, Luthy E (1964) Die Thermodilutionsmethode zur Erfassung der Herzfunktion. Arztl Forsch 20:569 181. Rutishauser W, Stucky J, Schad N, Wirz P (1966) Kreislaufmessungen mittels Rontgencinedensitometrie.

Jo From this transmission the fIlm density can also be calculated: 1 S = logy. (16) Equating (14) and (16) results in: y . 10g(cI) (c· 1 = log y' 1 IF = y. (17) (17) applied in (13): Y 1 (I) 1 Il T,. Y 1 T = - In - - = - In - . YilT,. (18) T,. , from a preliminary radiograph. With a scanning step k and a vascular width of nk, the A = Llk [yeo) + y(n) + n~l Y(k)]. 9 %. Since this method is rather time consuming, comparative measurements were performed and evaluated by hand, which showed an error discrepancy of 5 %.

Apart from Mayr [144], only Bartl [14] and Weiske [222] have measured pulsationrelated velocities in the abdominal aorta. 1 cm/s as a mean value for persons with normal blood pressure. 9 cm/s. 1 cm/s. In sound kidneys Bartl [14] measures a flow velocity of 45 cm/s as the average of all values. Deininger [46] measures a mean front velocity of 56 cm/s with a deviation of ± 24 cm/s. 8 cm/s as the average value attained from all measurements. The standard deviation in his measurements is ± 7 cm/s. 5 cm/s.

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