US4613754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tomographic calibration apparatus
Assignee: Shell USA Inc
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Filing: 1983-12-29
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Granted: 1986-09-23
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Expires: 2003-12-29
Abstract
Abstract An apparatus for providing data for the calibration of the atomic number and density of a test material being scanned in the radiation field of a computerized axial tomographic scanner (CAT). The apparatus comprises a housing which is adapted to be positioned in the X-ray field of the CAT in a predetermined position. The housing has an aperture that is adapted to accommodate the test material, and a plurality of calibration materials which have known atomic numbers and densities are positioned in the housing. In addition, the present invention provides a calibration apparatus that has a surface that is adapted to accommodate the test material.
Inventors
- 👤 Harold J. Vinegar
- 👤 Scott L. Wellington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:29
CPC Classifications
G; G01; G01D; G01D18/00; G01N; G01N23/00; G01N23/02; G01N23/04; G01N23/046; G01N2223/00; G01N2223/40; G01N2223/419
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
73 words
An apparatus for providing data for the calibration of the atomic number and density of a test material being scanned in the radiation field of a computerized axial tomographic scanner, said apparatus comprising: a housing adapted to be positioned in said radiation field in a predetermined position and having an aperture adapted to accommodate said test material; and a plurality of calibration materials having known atomic numbers and densities positioned in said housing.
Claim 2
Independent Claim
73 words
An apparatus for providing data for the calibration of the atomic number and density of a test material being scanned in the radiation field of a computerized axial tomographic scanner, said apparatus comprising: a housing adapted to be positioned in said radiation field in a predetermined position and having an aperture adapted to accommodate said test material; and a plurality of calibration materials having known atomic numbers and densities positioned in said housing.
Claim 3
Dependent Claim
18 words
An apparatus as recited in claim 1, wherein said plurality of calibration materials comprises a plurality of rods.
Claim 4
Dependent Claim
23 words
An apparatus as recited in claim 1, wherein said plurality of calibration materials comprises a plurality of vials containing a plurality of fluids.
Claim 5
Dependent Claim
26 words
An apparatus as recited in claim 1, wherein said predetermined position of said housing is stationary within said radiation field and said test material is moveable.
Claim 6
Dependent Claim
22 words
An apparatus as recited in claim 1, wherein said plurality of calibration materials are at least as long as said test materials.
Claim 7
Dependent Claim
13 words
An apparatus as recited in claim 1, wherein said housing comprises a cylinder.
Claim 8
Dependent Claim
29 words
An apparatus as recited in claim 1, wherein said housing is made of a material that has a low X-ray absorption in relation to said plurality of calibration materials.
Claim 9
Dependent Claim
37 words
An apparatus as recited in claim 7, wherein said plurality of calibration materials comprises materials that have atomic numbers and densities that are similar to the atomic numbers and densities of the materials in said test material.
Claim 10
Independent Claim
68 words
An apparatus for providing data for the calibration of the atomic number and density of a test material being scanned in the radiation field of a computerized axial tomographic scanner (CAT), said apparatus comprising: a housing adapted to be positioned in said radiation field in a predetermined position adjacent said test material; and a plurality of calibration materials having known atomic numbers and densities positioned in said housing.
Claim 11
Independent Claim
68 words
An apparatus for providing data for the calibration of the atomic number and density of a test material being scanned in the radiation field of a computerized axial tomographic scanner (CAT), said apparatus comprising: a housing adapted to be positioned in said radiation field in a predetermined position adjacent said test material; and a plurality of calibration materials having known atomic numbers and densities positioned in said housing.
Claim 12
Dependent Claim
13 words
An apparatus as recited in claim 8, wherein said housing comprises a table.
Claim 13
Dependent Claim
15 words
An apparatus as recited in claim 9, wherein said test material comprises a human body.
Claim 14
Dependent Claim
18 words
An apparatus as recited in claim 8, wherein said plurality of calibration materials comprises a plurality of rods.
Claim 15
Dependent Claim
23 words
An apparatus as recited in claim 8, wherein said plurality of calibration materials comprises a plurality of vials containing a plurality of fluids.
Claim 16
Dependent Claim
29 words
An apparatus as recited in claim 8, wherein said housing is made of a material that has a low X-ray absorption in relation to said plurality of calibration materials.
Claim 17
Dependent Claim
13 words
An apparatus as recited in claim 8, wherein said housing comprises a cylinder.
Claim 18
Dependent Claim
26 words
An apparatus as recited in claim 9, wherein said predetermined position of said housing is stationary within said radiation field and said test material is moveable.
Claim 19
Dependent Claim
22 words
An apparatus as recited in claim 8, wherein said plurality of calibration materials are at least as long as said test materials.
Claim 20
Dependent Claim
37 words
An apparatus as recited in claim 17, wherein said plurality of calibration materials comprises materials that have atomic numbers and densities that are similar to the atomic numbers and densities of the materials in said test material.
Claim 21
Dependent Claim
21 words
An apparatus as recited in claim 18, wherein said housing comprises a table and said test material comprises a human body.
References Cited (Backward Citations)
US4029963A
Cited
US4233507A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-22 | 1990-03-24 | 1990-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-22 | 1994-03-24 | 1994-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-22 | 1998-03-24 | 1998-09-23 | $7700.00 | Window Closed / Lapsed |