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Method of inspecting stray light that occurs in a radiation image reader
| Details |
Inventors: Kuroda, Osamu; Karasawa, Hiroyuki;
Assignee: Fuji Photo Film Co., Ltd. (Kanagawa-ken, JP)
Primary Examiner: Porta; David
Assistant Examiner: Lee; Shun
Attorney, Agent or Firm: Sughrue Mion, PLLC
The inspection method comprises: preparing a storage fluorescent inspection sheet that has stored and recorded a radiation inspection image which has a density pattern in which one or more low-density and high-density regions having a contrast difference of at least 1:20 are arrayed in a horizontal scanning direction; obtaining an image inspection signal representing the radiation inspection image, by photoelectrically reading the radiation inspection image from the storable fluorescent inspection sheet; and inspecting the influence of stray light, based on an image reproduced from the image inspection signal. An inspection image plate has contrast differences of high-density and low-density regions of at least 1:20. |
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DETAILED DESCRIPTION The present invention has been made in view of the above-mentioned circumstances.
Accordingly, it is the primary object of the present invention to provide an inspection method that is capable of inspecting stray light that occurs in a radiation image reader.
To achieve this end and in accordance with an important aspect of the present invention, there is provided a method of inspecting influence of stray light which occurs in a radiation image reader equipped with horizontal scanning means for scanning excitation light on a storable fluorescent sheet, having stored and recorded a radiation image, in a horizontal scanning direction; vertical scanning means for scanning the storable fluorescent sheet in a vertical scanning direction approximately perpendicular to the horizontal scanning direction; and reading means for obtaining an image signal which represents the radiation image by photoelectrically reading the radiation image, stored and recorded in the storable fluorescent sheet, by the horizontal scanning of the excitation light.
The inspection method comprises the steps of: preparing a storable fluorescent inspection sheet that has stored and recorded a radiation inspection image which has a density pattern in which one or more low-density and high-density regions having a contrast difference of at least 1:20 are arrayed in the horizontal scanning direction; obtaining an image inspection signal representing the radiation inspection image, by photelectrically reading the radiation inspection image from the storable fluorescent inspection sheet with the reading means; and inspecting the influence of stray light, based on an image reproduced from the image inspection signal.
Note that it is desirable that the contrast difference be 1:20 or greater, preferably 1:50 or greater.
In the inspection method, the boundary line, in the radiation inspection image, between the low-density and high-density regions may be constructed by a straight line and may be inclined with respect to the horizontal scanning direction so that it intersects both edges of the radiation inspection image which extend in the vertical scanning direction
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Active Solid-state 
