Anti-scatter X-ray grid device for medical diagnostic radiography

• US 5,581,592 A
• Filed: 03/10/1995
• Issued: 12/03/1996
• Est. Priority Date: 03/10/1995
• Status: Expired due to Term

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Guida, Renato, Zarnoch, Kenneth P.
• Primary Examiner(s): WONG, DON KITSUN
• Application Number:
  US08/402,223
• Time in Patent Office: 634 Days
• Field of Search: 378/154, 378/145, 378/147, 378/149
• US Class Current: 378/154
• CPC Class Codes: G21K 1/025 using multiple collimators, e.g. Bucky screens; other devices for eliminating undesired or dispersed radiation

Abstract

An anti-scatter x-ray grid for medical diagnostic radiography includes a substrate having channels therein of material that is substantially non-absorbent of x-radiation and absorbing material in the channels including material that is substantially absorbent of x-radiation. The substrate preferably comprises material capable of remaining stable at the melting temperature of the absorbing material.

Claims

1. An anti-scatter x-ray grid for medical diagnostic radiography, the grid comprising:

a substrate having channels therein, the substrate comprising material that is substantially non-absorbent of x-radiation; and

absorbing material in the channels, the absorbing material comprising material that is substantially absorbent of x-radiation, the substrate comprising plastic material capable of remaining stable at the melting temperature of the absorbing material.

2. The grid of claim 1, wherein the absorbing material comprises material capable of being melted and removed from the substrate.

3. The grid of claim 1, wherein the substrate is a material selected from the group consisting of polyetherimides, polyimides, and polycarbonates.

4. The grid of claim 3, wherein the substrate further comprises filler material.

5. The grid of claim 1, wherein the absorbing material comprises a lead-metal alloy.

6. The grid of claim 5, further including an adhesion promoting material between the substrate and the absorbing material, the adhesion promoting material is a material selected from the group consisting of copper, nickel, and iron.

7. The grid of claim 1, wherein the absorbing material comprises a metal alloy including material selected from the group consisting of lead, bismuth, gold, barium, tungsten, platinum, mercury, thallium, indium, palladium, silicon, antimony, tin, and zinc.

8. The grid of claim 1, wherein the absorbing material comprises a range of 60% to 50% bismuth and a corresponding range of 40% to 50% lead.

9. The grid of claim 1, further including a protective layer over at least one surface of the substrate, the protective layer comprising material that is substantially non-absorbent of x-radiation.

10. The grid of claim 9, wherein the protective layer comprises a plastic.

11. The grid of claim 1, wherein at least some of the channels are angled such that the channels are aligned to an x-radiation source.

12. The grid of claim 1, further including an adhesion promoting material between the substrate and the absorbing material.

14. The grid of claim 12, wherein the line rate of the channels per centimeter ranges from 120 to 300.

13. An anti-scatter x-ray grid for medical diagnostic radiography, the grid comprising:

a substrate having channels therein, the substrate comprising material that is substantially non-absorbent of x-radiation; and

absorbing material in the channels, the absorbing material comprising material that is substantially absorbent of x-radiation,

wherein the ratio of the height of the absorbing material and the distance between channels ranges from 2;

1 to 16;

1 and wherein the line rate of the channels per centimeter ranges from 30 to 300.