Advertisement

Appendix

  • R. P. van Wijk van Brievingh
Chapter
  • 21 Downloads

Abstract

As proposed by SNEEK (1971, internal report M82), the ventricle within the thorax is modelled by a sphere of radius R, filled with a volume concentration c of contrast medium with a linear extinction coefficient µc, embedded in a flat layer of thickness D of water-like substance with a linear extinction coefficient µw. The mixture within the ball then has a linear extinction coefficient
$$\mu _2 = c\mu + \left( {1 - c} \right)\mu _w$$
(13.1)
If monochromatic radiation is assumed, the intensity I(x) of the outgoing radiation as a function of the distance x from the center amounts to (Fig. 13.1)
$$I_2 \left( X \right) = I_0 e^{ - \left\{ {\mu _2 2\sqrt {R^2 - x^2 } + \mu _1 \left( {D - 2\sqrt {R^2 - x^2 } } \right)} \right\}}$$
(13.2a)
for 0≦|x|≦R, and to
$$I_1 \left( x \right) = I_0 e^{ - \mu _1 D}$$
(13.2b)
for |x|≧R; Io being the incident radiation intensity.

Keywords

Modulation Transfer Function Optical Transfer Function Edge Response Frequency Amplitude Spectrum Incident Radiation Intensity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Abbreviations

AP

Anterio-posterior projection direction

BSA

Body surface area

EDV

End-diastolic volume

EF

Ejection fraction

EFS

Effective focal spot size

ESV

End-systolic volume

ET

End-tidal

HT

High-tension

LSF

Line-spread function

LVV

Left-ventricular cavity volume

MTF

Modulation transfer function

OTF

Optical transfer function

PSF

Point-spread function

SV

Stroke volume

SW

Stroke work

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Copyright information

© Nijgh-Wolters-Noordhoff Universitaire Uitgevers B.V., Rotterdam 1975

Authors and Affiliations

  • R. P. van Wijk van Brievingh

There are no affiliations available

Personalised recommendations