Dual-energy radiography process differentiating bone tissues, lean tissues and fatty tissues
First Claim
1. A radiography process, comprising:
- irradiating an organism with dual energy rays;
selecting rays which have not penetrated bone tissues;
calculating a sum of a thickness of lean tissue and the thickness of fatty tissue penetrated by said selected rays according to an attenuation sustained at said thickness of said lean tissue and said thickness of said fatty tissue;
calculating at least one total length penetrated by said selected rays in the organism which is equal to said sum of thickness of said lean tissue and said thickness of said fatty tissue for said selected rays; and
estimating at least one other total length penetrated by said dual energy rays by interpolation between said sum of thickness of said lean tissue and said fatty tissue and a sum of thicknesses for rays different from said selected rays;
calculating the thicknesses of bone tissues, lean tissues and fatty tissues penetrated by said dual energy rays according to the attenuations sustained at the two energies and the total lengths.
1 Assignment
0 Petitions
Accused Products
Abstract
This radiography process utilizes dual-energy rays and comprises, in order to differentiate bone, lean and fatty tissues at the same time, an improvement consisting in assessing the total length penetrated by each ray while correcting the errors which may be produced by internal gas pockets. One proceeds as follows: selection of certain rays which have not penetrated bone tissues; calculation of the thicknesses of lean and fatty tissues penetrated by these rays according to the two attenuations, the sum of these two thicknesses being the length of attenuation; estimation of the length of attenuation elsewhere, in particular by means of interpolations; and calculation of the thicknesses of the three categories of tissues penetrated according to this total length of attenuation and the two attenuations.
10 Citations
8 Claims
-
1. A radiography process, comprising:
-
irradiating an organism with dual energy rays;
selecting rays which have not penetrated bone tissues;
calculating a sum of a thickness of lean tissue and the thickness of fatty tissue penetrated by said selected rays according to an attenuation sustained at said thickness of said lean tissue and said thickness of said fatty tissue;
calculating at least one total length penetrated by said selected rays in the organism which is equal to said sum of thickness of said lean tissue and said thickness of said fatty tissue for said selected rays; and
estimating at least one other total length penetrated by said dual energy rays by interpolation between said sum of thickness of said lean tissue and said fatty tissue and a sum of thicknesses for rays different from said selected rays;
calculating the thicknesses of bone tissues, lean tissues and fatty tissues penetrated by said dual energy rays according to the attenuations sustained at the two energies and the total lengths. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
Specification