Download Radiation Exposure and Image Quality in X-Ray Diagnostic by Horst Aichinger, Joachim Dierker, Sigrid Joite-Barfuß, PDF

By Horst Aichinger, Joachim Dierker, Sigrid Joite-Barfuß, Manfred Säbel

This thoroughly up-to-date moment variation of Radiation publicity and snapshot caliber in X-ray Diagnostic Radiology presents the reader with distinct assistance at the optimization of radiological imaging. the elemental actual rules of diagnostic radiology are first awarded intimately, and their software to medical difficulties is then rigorously explored. the ultimate part is a complement containing tables of information and graphical depictions of X-ray spectra, interplay coefficients, features of X-ray beams, and different elements proper to sufferer dose calculations. moreover, a complementary CD-ROM encompasses a common Excel dossier database overlaying those facets that may be utilized in the reader’s personal courses. This ebook can be a useful reduction to scientific physicists while acting calculations in relation to sufferer dose and snapshot caliber, and also will end up valuable for diagnostic radiologists and engineers.

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Extra info for Radiation Exposure and Image Quality in X-Ray Diagnostic Radiology: Physical Principles and Clinical Applications

Sample text

A... 10 0,7 E ~ 0,6 i c 0,5 Q. 0001 20 40 60 80 -1--+-1---1_ __ I Photon energy in keY I_~_L~ I 60 40 100 -r-'-T-'- -r-I == =C::::l=r=l= =C:=I=I=C =:c=, I ~_~_L4 ° -r-,-r-'I ~~E3=r~OF~~~~T=~-"= =,=-::l=C=I= :CJ:[:C __ ' I 80 I I :c:J:r:r: :c:l:r:c :[:, __ I_~_L_I I I 100 _1-_1_-1-_1- _<-_I L_I_~_L _~_I __ L~_L_I I I 120 I I I 140 X-ray tube voltage in kV Fig. 6. 5 mm AI) behind 0 em, 10 em and 20 em water Fig. 7. 5 mm AI, focus distance 100 em) behind Oem, 10 em, 20 em and 30 em water Therefore the contrast in radiographs oflarge patients is not only reduced by the existence of a high percentage of scatter (see Chap.

3). In this respect the employment of additional filters with the objective to reduce patient dose will be discussed in Chap. 4. with the unit per square metre. ii~~--:syste m dose Ke Fig. 1. 2) where

L00kV -115kV ··· .. g. like a patient support, rather it has exceptional physical characteristics. In diagnostic X-ray imaging, it is the most important and widely applied tool to reduce the amount of scattered radiation at the recording system and to enhance image contrast (see Chaps. 2). As a rule the employment of a grid is, however, connected with an increased radiation exposure of the patient. g. in paediatrics (see Chaps. 3). For a patient thickness which is equivalent to a 20-cm water phantom, a moving 12/40 grid (that means a grid with a ratio of r = 12 and a line density of 40 lines per centimetre; see Chap.

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