X-ray image processing apparatus

• US 4,916,722 A
• Filed: 06/24/1987
• Issued: 04/10/1990
• Est. Priority Date: 06/26/1986
• Status: Expired due to Fees

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Ema, Takehiro
• Primary Examiner(s): Howell, Janice A.
• Assistant Examiner(s): Freeman, John C.
• Application Number:
  US07/066,093
• Time in Patent Office: 1,021 Days
• Field of Search: 378/7, 378/99, 358/111
• US Class Current: 378/98.4
• CPC Class Codes: G21K 1/025 using multiple collimators, e.g. Bucky screens; other devices for eliminating undesired or dispersed radiation
• CPC Class Codes: H04N 5/32 Transforming X-rays cameras or camera modules for generating image signals from X-rays H04N23/30; circuitry of SSIS for transforming X-rays into image signals H04N25/30

Abstract

An X-ray image processing apparatus includes an arithmetic operation section for processing the X-ray image data, to eliminate X-ray scattered components (first blurring factor) and a veiling glare (second blurring factor) which occurs when an image intensifier converts X-ray image to a photo-image, and a TV camera converts the photo-image to an image signal. The X-ray image data obtained by eliminating the scattered components and the blurring components derived from the veiling glare includes only blurring components (third blurring factor) derived from the characteristics of an X-ray tube, an image intensifier, and TV camera. A blurring restoration filter circuit is provided, for forming a filter for restoring the blurring from the third factor.

Claims

1. An x-ray image processing apparatus comprising:

X-ray radiating means for radiating at least one of a first, second, third, and fourth object, with X-rays;

output means for outputting first image data corresponding to the first object including an X-ray shielding member, second image data corresponding to the second object including an X-ray shielding member and an X-ray absorption member, third image data corresponding to the third object which excludes the X-ray absorption member, and fourth image data corresponding to the fourth object including the X-ray absorption member, upon X-ray radiation;

first arithmetic operation processing means, for subtracting the third X-ray image data from the first X-ray image data, to output first corrected image data from which scattered X-ray components are removed, and for subtracting the fourth X-ray image data from the second X-ray image data, to output second corrected image data from which scattered X-ray components are removed;

second arithmetic operation processing means, for subtracting the second corrected image data from the first corrected image data, for outputting third corrected image data; and

filter data output means for arithmetically processing the third corrected image data, in accordance with predetermined equations, to obtain restoration filter information.

2. An apparatus according to claim 1, wherein said output means includes means for outputting first correction data corresponding to image data of a fifth object, which excludes an X-ray absorption member, and outputting second correction data corresponding to image data of a sixth object, which includes the X-ray absorption member, and wherein said first arithmetic operation processing means includes means for arithmetically processing the first and second X-ray image data according to the first and second correction data, to correct the first and second X-ray image data according to the first and second correction data, respectively.

3. An apparatus according to claim 2, wherein the fifth and sixth objects include small chips of X-ray shielding members for obtaining X-rays scattered by a very small object.

4. An apparatus according to claim 1, wherein said second arithmetic operation processing means includes means for executing arithmetic operation processing to remove DC components from the third corrected image data.

5. An apparatus according to claim 1, wherein the first and second objects include an elongated X-ray shielding member for obtaining X-rays scattered in one direction.

6. An apparatus according to claim 1, wherein the second and fourth objects include an X-ray absorption member consisting of at least one element selected from the group consisting of aluminum, copper, and iron.

7. An X-ray image processing apparatus producing an X-ray image of an object, comprising:

X-ray radiating means for radiating the object with X-rays;

output means for outputting, upon X-ray radiation, a first and a second type of X-ray image data including the object, and a third and a fourth type X-ray image data excluding the object;

correcting means for correcting the first and the second type X-ray image data by correction coefficients, to output first and second corrected type X-ray image data respectively;

first arithmetic operation processing means, for subtracting the third type X-ray image data from the first corrected type X-ray image data, to output first corrected image data from which scattered X-ray components are removed;

second arithmetic operation processing means, for subtracting fourth type X-ray image data from the second corrected type X-ray image data, to output second corrected image data from which scattered X-ray components are removed;

means for calculating a difference between the first corrected image data output from said first arithmetic operation processing means and the second corrected image data output from said second arithmetic operation processing means, to output difference data; and

means for executing correction processing of the first corrected image data output from said first arithmetic operation processing means, according to the difference data, to equalize a density level of the X-ray image.

8. An apparatus according to claim 7, wherein the object includes at least one small chip of an X-ray shielding member for obtaining X-rays scattered by a very small object.

9. An apparatus according to claim 7, wherein said second arithmetic operation processing means includes means for executing arithmetic operation processing to remove DC components from the second corrected image data.

10. An apparatus according to claim 7, wherein said object includes an elongated X-ray shielding member for obtaining X-rays scattered in one direction.

11. An apparatus according to claim 10, wherein said X-ray shielding member consists of lead.

12. An X-ray image processing apparatus comprising:

X-ray radiation means for radiating x-rays onto a first object including one of a one-dimensional X-ray shielding member, radiating a second object including at least one small chip of X-ray shielding member which is located at a position where no scattered X-ray component passes, and radiating a third object;

first output means for detecting X-rays transmitted through said second object which includes true scattered X-ray components produced by said X-ray radiation means, for outputting a true scattered X-ray data corresponding to the true scattered X-ray components not shielded by the one-dimensional X-ray shielding member, and for outputting x-ray data of said third object;

means for calculating correction coefficients from a one-dimensional scattered X-ray data corresponding to an X-ray image of the one-dimensional shielding member and the true scattered X-ray data;

second output means for outputting X-ray image data corrected by the correction coefficients;

arithmetic operation processing means for outputting corrected image data by having means to obtain a difference between said x-ray data of said third object and from said X-ray image data obtained from said second output means; and

means for correcting the image data output from said first output means according to the corrected image data.

13. An apparatus according to claim 12, wherein said output means includes means for converting an X-ray image, corresponding to the object, into the X-ray image data, and means for eliminating blurring components responsive to said converting means.

14. An apparatus according to claim 13, wherein said converting means of said output means includes an image intensifier for converting the X-rays emitted from said X-ray radtiation means and passed through said object, to a photo-image, and photographing means for converting the photo-image into the X-ray image data.