Method and apparatus for transmitting information about a target object between a prescanner and a CT scanner

• US 6,816,571 B2
• Filed: 02/06/2002
• Issued: 11/09/2004
• Est. Priority Date: 02/06/2002
• Status: Expired due to Term

• Current Assignee: Leidos Security Detection & Automation Incorporated (Leidos Holdings, Inc.)
• Original Assignee: L-3 Communications Security and Detection Systems Corporation Delaware
• Inventors: Eilbert, Richard F., Shi, Shunghe, Bijjani, Richard R.
• Primary Examiner(s): Glick, Edward J.
• Assistant Examiner(s): Ho, Allen C.
• Application Number:
  US10/068,459
• Publication Number:
  US 20030147489A1
• Time in Patent Office: 1,007 Days
• Field of Search: 378/5, 378/57, 378/98.9, 378/207
• US Class Current: 378/57
• CPC Class Codes: G01N 2223/402 mapping distribution of elements
• CPC Class Codes: G01N 2223/419 computed tomograph
• CPC Class Codes: G01N 2223/421 digitised image, analysed in real time (recognition algorithms)
• CPC Class Codes: G01N 23/046 using tomography, e.g. computed tomography [CT]
• CPC Class Codes: G01N 23/087 using polyenergetic X-rays
• CPC Class Codes: G01V 5/224 Multiple energy techniques using one type of radiation, e.g. X-rays of different energies
• CPC Class Codes: G01V 5/226 using tomography

Abstract

A method or apparatus for analyzing an object includes an X-ray prescanner that performs a prescan of the object to determine prescan information about the object. Then, a CT scanner performs a CT scan on at least one plane of the object based on the prescan information to determine CT information. In one embodiment, if the CT scan of the object includes or is in the vicinity of metal, then metal artifact correction of a reconstructed image from the CT scan is performed based on the prescan information. In another embodiment, a processor analyzes the CT information and the prescan information to determine whether to update the prescan information based on the CT information

Claims

1. A method for analyzing contents of an item comprising acts of:

prescanning the item using an X-ray device to determine first information indicative of a location of a target object;

performing a computed tomography scan of a plane intersecting the target object to determine second information indicative of density characteristics of the target object; and

transmitting the second information to a processor to determine whether to modify the first information.

2. The method of claim 1 wherein the act of transmitting includes transmitting the second information to a processor within the X-ray device.

3. An apparatus for analyzing an object, the apparatus comprising:

an X-ray device that prescans the object; and

a computed tomography device that scans selected areas of the object;

wherein information indicative of density characteristics of the object are transmitted from the computed tomography device to the X-ray device.

4. The apparatus of claim 3, wherein the X-ray device includes a processor.

5. The apparatus of claim 3, wherein the X-ray device has a high energy X-ray source and a low energy X-ray source.

6. The apparatus of claim 3, further comprising a convey for transporting the item between the X-ray device and the computed tomography device.

7. The apparatus of claim 3, wherein the computed tomography device is a multiple energy computed tomography device.

8. A method comprising:

prescanning an item using a multiple energy X-ray device to determine first information;

transmitting the first information to a computed tomography device;

performing a computed tomography scan on a plane of the item using the computed tomography device based on the first information to determine second information; and

transmitting the second information to the multiple energy X-ray device.

9. The method of claim 8 wherein performing includes performing a computed tomography scan using a multiple energy computed tomography device.

10. The method of claim 8, wherein transmitting the first information to a computed tomography device includes transmitting information indicative of effective atomic number characteristics of the item.

11. The method of claim 8, wherein transmitting the second information to the multiple energy X-ray device includes transmitting information indicative of density characteristics of the item.