Method of and apparatus for correcting scattered X-rays for X-ra

Details Method of and apparatus for correcting scattered X-rays for X-ra Method of and apparatus for correcting scattered X-rays for X-ra

1994-11-01

1997-03-25

Johns, Andrew

Image analysis

Applications

Biomedical applications

382275, 378 7, G06K 936

Patent

active

056152795

ABSTRACT:
In a scattered X-ray correction method for an X-ray computerized tomograph, the quantity of X-rays passed through a phantom is measured to be converted into logarithms. Obtained from the logarithmic data is a scattered X-ray correction curve representing a relationship between the measured data in the logarithmic expression and an amount of scattered X-ray correction. For a subject, the quantity of X-rays penetrated therethrough is measured to be transformed into logarithms. From the measured data undergone the logarithmic conversion and the scattered X-ray correction curve, there is attained a scattered X-ray correction amount in a linear region which is the state before the logarithmic conversion. The measured data of the subject in the logarithmic expression is subjected to an inverse logarithmic conversion. From the obtained values, the scattered X-ray correction amount is subtracted such that the resultant values are again converted into logarithms, thereby producing a computerized tomogram from the logarithmic values.

REFERENCES:
patent: 4081681 (1978-03-01), Froggatt
patent: 4656650 (1987-04-01), Kikuchi et al.
patent: 4785401 (1988-11-01), Harding et al.
patent: 4918713 (1990-04-01), Honda
patent: 5440647 (1995-08-01), Floyd, Jr. et al.

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