Abstract
Beam centring devices are necessary for accurate patient positioning. They indicate the direction of the “central ray” of the X-ray beam and its point of incidence on the area under examination. The more advanced beam centring devices also provide a means of adjustment of the size of the irradiated area, and indicate the chosen area on the surface of the patient by means of light projection. Beam centring aids may be categorised as follows:
-
(i)
Simple centre pointer.
-
(ii)
Focussed cross lights.
-
(iii)
Light beam diaphragms.
-
(iv)
Optical view finders.
-
(v)
Other beam centring devices.
This is a preview of subscription content, log in via an institution to check access.
Preview
Unable to display preview. Download preview PDF.
Editor information
Copyright information
© 1975 Philips Technical Library
About this chapter
Cite this chapter
Hill, D.R. (1975). Beam Centring Devices. In: Hill, D.R. (eds) Principles of Diagnostic X-Ray Apparatus. Philips Technical Library. Palgrave, London. https://doi.org/10.1007/978-1-349-02452-0_13
Download citation
DOI: https://doi.org/10.1007/978-1-349-02452-0_13
Publisher Name: Palgrave, London
Print ISBN: 978-1-349-02454-4
Online ISBN: 978-1-349-02452-0
eBook Packages: Engineering