Title:
METHOD FOR MONITORING SENSITIVITY OF DEVICE FOR READING RADIATION PICTURE RECORDED ON LIGHT STIMULATIVE FLUORESCENT SCREEN
Document Type and Number:
Japanese Patent JP3599376
Kind Code:
B2
Abstract:
PURPOSE: To provide a method for monitoring the detection sensitivity of a device for reading the radiation picture of an object recorded on a light stimulative fluorescent screen by exposing the light stimulative fluorescent screen by irradiation light.
CONSTITUTION: This method consists of a process for scanning the light stimulative fluorescent screen by stimulation irradiation light, the process for detecting emitted light quantity by stimulation scanning, the process for converting the detected light quantity to electric signals, the process for compressing the electric signals by a square root amplification processing and the process for digitizing the compressed electric signals. A noise dispersion value σe2 corresponding to a sensitivity class set at the point of time of preparing the radiation picture is called from a prescribed table. Then, the ratio of σy2/σe2 is calculated and a threshold value operation is performed. As a result, in the case that a radio value σy2/σe2 exceeds a threshold value T+ or in the case that it is smaller than the threshold value T-, alarm signals are prepared.
Inventors:
Piete Vilstek
Application Number:
JP21037894A
Publication Date:
December 08, 2004
Filing Date:
August 10, 1994
Export Citation:
Assignee:
AGFA-GEVAERT NAAMLOZE VENNOOTSCHAP
International Classes:
G06T1/00; G03B42/02; G06T5/00; H04N1/04; (IPC1-7): G03B42/02
Domestic Patent References:
| JP4246982A | ||||
| JP63196358A | ||||
| JP63253481A | ||||
| JP2305191A | ||||
| JP634568A |
Foreign References:
| WO1997023993A1 |
Attorney, Agent or Firm:
Mitsuo Adachi
Nobuaki Kazehaya
Nobuaki Kazehaya