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Title: US4747052: Radiation image processing
[ Derwent Title ]

Country: US United States of America

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10 pages

Inventor: Hishinuma, Kazuhiro; Kanagawa, Japan
Funahashi, Takeshi; Kanagawa, Japan
Ishida, Masamitsu; Kanagawa, Japan
Karam, Jr., James T.; Monroe, CT

Assignee: Philips Medical Systems, Inc., Shelton, CT
other patents from PHILIPS MEDICAL SYSTEMS, INC. (438760) (approx. 6)
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Published / Filed: 1988-05-24 / 1985-10-28

Application Number: US1985000791678

IPC Code: Advanced: H04N 1/409;
Core: more...
IPC-7: H04N 1/40;

U.S. Class: Current: 250/587; 358/447; 382/262;
Original: 364/414; 364/514; 358/284; 358/111;

Field of Search: 364/414,515 350/284

Priority Number:
1984-11-14  JP1984000240361
1984-11-14  JP1984000240362

Abstract: A method and apparatus for image processing on a radiation image which may be a conventional radiographic image on X-ray film or a radiation image which is stored in a stimulable phosphor and read out therefrom. The radiation image is scanned by a light beam or stimulating rays and an image signal is obtained by use of a photodetector. The image signal is subjected to a frequency processing by use of an unsharp masking process. The unsharp mask signal (Sus) is used for conducting an operation of
to obtain an image-processed signal S, wherein Sorg is a digital signal for each picture element of the scanned image and β is a frequency emphasizing coefficient. The median of a group of digital signals in an unsharp mask of a predetermined size is employed.

Attorney, Agent or Firm: Haken, Jack E. ;

Primary / Asst. Examiners: Ruggiero, Joseph; Meyer, Charles B.

Maintenance Status: E3 Expired  Check current status

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Designated Country: DE FR GB 

Family: Show 11 known family members

First Claim:
Show all 13 claims
We claim:     1. An X-ray image processing method comprising the steps of:
  • scanning an original X-ray image to photoelectrically read, and produce an electrical image signal from, X-ray image information;
  • converting said electric image signal into a plurality of digital signals (Dorg) which represent respective picture elements of said X-ray image;
  • calculating a median value (Dus) for a group of said digital signals in a mask of a predetermined size;
  • filtering said electrical image signal using the filter

  •     D'=Dorg+β(Dorg-Dus)
  • where D' is a filtered image signal and β is a frequency emphasizing coefficient; and
  • reproducing a visible image of said X-ray image from the filtered image signal;
  • thereby emphasizing particular frequency components and objects in said visible image signal.

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Forward References: Show 31 U.S. patent(s) that reference this one

U.S. References: Go to Result Set: All U.S. references   |  Forward references (31)   |   Backward references (5)   |   Citation Link

Patent  Pub.Date  Inventor Assignee   Title
Get PDF - 25pp US4315318  1982-02 Kato et al.  Fuji Photo Film Co., Ltd. Method and apparatus for processing a radiation image
Get PDF - 25pp US4317179  1982-02 Kato et al.  Fuji Photo Film Co., Ltd. Method and apparatus for processing a radiographic image
Get PDF - 14pp US4346409  1982-08 Ishida et al.  Fuji Photo Film Co., Ltd. Method of and apparatus for processing a radiographic image
Get PDF - 14pp US4387428  1980-06 Ishida et al.  Fuji Photo Film Co., Ltd. Method of and apparatus for processing a radiation image
Get PDF - 24pp US4394737  1983-07 Komaki et al.  Fuji Photo Film Co., Ltd. Method of processing radiographic image
Foreign References: None

Other Abstract Info: DERABS C86-138840

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