Method of adjustment of configuration in digital radiology

Details Method of adjustment of configuration in digital radiology Method of adjustment of configuration in digital radiology

1999-11-29

2001-09-18

Bruce, David V. (Department: 2882)

X-ray or gamma ray systems or devices

Electronic circuit

X-ray source power supply

C378S037000

Reexamination Certificate

active

06292536

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a method of adjustment of the parameters of exposure in digital radiology, and in particular in digital mammography.
Conventionally, in radiology, the parameters of exposure such as focal track selected (in the case of a device with double focal track), filter used, voltage applied to the tube (kV), presence or absence of grid, enlargement of contact and product of anodic current by duration of exposure (mA.s), constituting what is called the configuration, are initially determined from a selection of the user for the parameters of presence or absence of grid and enlargement or contact, and from a table of automatic optimization of parameters (AOP), as a function of the selections of the user, for the parameters kV, focal track, filter and mA.s. The organ part examined is then subjected to a preexposure with a low mA.s value to determine the characteristics of the organ part examined, in particular the equivalent radiologic thickness, and the parameters of exposure are then adjusted from these characteristics.
More precisely, at the time of preexposure an automatic exposure control (AEC) cell is used and the equivalent radiologic thickness is determined from the signal of the AEC cell. In order to obtain a good estimate of the equivalent radiologic thickness, 60 different parameters must be determined by means of the AEC calibration cell. An estimate of the composition of the organ part examined and an adjustment of the parameters of exposure (configuration) is then made with an initial estimate of mA.s.
During an exposure of the organ part examined with the previously determined configuration, the AEC cell continuously updates the mA.s value.
For further details concerning the method described above, reference is made to documents EP-0,402,244 and EP-0,465,360.
The method of adjustment of the configuration described above has the disadvantage of necessitating a specific calibration device, namely the AEC cell, and of requiring the determination of a large number of parameters.
BRIEF SUMMARY OF THE INVENTION
An embodiment of the present invention is a method of adjustment of the configuration, in digital radiology, which does not necessitate the use of a specific calibration cell and requires only a small number of parameters.
An embodiment of the present invention is a method of adjustment of the configuration necessitating a single image for each configuration and which uses the signals of the detector directly to effect adjustment of the exposure configuration.


REFERENCES:
patent: 0402244 (1990-12-01), None
patent: 0465360 (1992-08-01), None
patent: 1004875 A2 (1999-11-01), None
patent: 1005258 A1 (1999-11-01), None
patent: 87/1555 (1987-03-01), None

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