US5095499A
Expired / Lapsed
US
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Oriented mammography phantom
Assignee: Individual
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Filing: 1989-10-05
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Granted: 1992-03-10
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Expires: 2009-10-05
Abstract
Abstract A mammographic phantom is disclosed having an orienting feature which permits the consistant placement of the phantom in the imaging plane of an X-ray beam. The phantom includes test objects which indicate the resolution capability of the X-ray system, as well as a step wedge which indicates X-ray beam quality. Consistant orientation permits the image of the test objects to be readily located on an exposed X-ray film and permits the step wedge to be accurately positioned adjacent the center of the X-ray beam to thereby reduce scattering affects.
Inventors
- 👤 Virginia R. Wentz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:53
CPC Classifications
A; A61; A61B; A61B6/00; A61B6/58; A61B6/582; A61B6/583
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
147 words
A radiographic phantom comprising, (a) a generally planar, slab-like at least partially radiolucent body having a non-uniform plan profile including a straight edge, (b) a series of regions of differing radiolucency disposed on said body adjacent said straight edge and cooperatively defining a step wedge, (c) a plurality of test objects including particles and fibers of differing sizes fixedly mounted to said body and having a radiolucency less than the radiolucency of said body, and (d) orienting means provided by said non-uniform plan profile to orient said body in an imaging plane of a radiographic apparatus so that the plane of said body lies substantially in said imaging plane and said body lies in a predetermined orientation in said imaging plane, whereby said test objects will lie in predetermined orientations relative to one another in said imaging plane when said body is oriented by said orienting means.
Claim 2
Dependent Claim
147 words
A radiographic phantom comprising, (a) a generally planar, slab-like at least partially radiolucent body having a non-uniform plan profile including a straight edge, (b) a series of regions of differing radiolucency disposed on said body adjacent said straight edge and cooperatively defining a step wedge, (c) a plurality of test objects including particles and fibers of differing sizes fixedly mounted to said body and having a radiolucency less than the radiolucency of said body, and (d) orienting means provided by said non-uniform plan profile to orient said body in an imaging plane of a radiographic apparatus so that the plane of said body lies substantially in said imaging plane and said body lies in a predetermined orientation in said imaging plane, whereby said test objects will lie in predetermined orientations relative to one another in said imaging plane when said body is oriented by said orienting means.
Claim 3
Dependent Claim
21 words
A phantom as claimed in claim 1 wherein said fibers have a diameter from about 0.10 mm to about 0.80 mm.
Claim 4
Dependent Claim
21 words
A phantom as claimed in claim 1 wherein said particles have a diameter from about 0.05 mm to about 0.35 mm.
Claim 5
Dependent Claim
15 words
A phantom as claimed in claim 1 wherein said particles simulate microcalcifications in breast tissue.
Claim 6
Dependent Claim
16 words
A radiological phantom as claimed in claim 4 wherein said particles are formed from calcium carbonate.
Claim 7
Dependent Claim
18 words
A phantom as claimed in claim 1 wherein said fibers simulate soft tissue fibrillar extensions in breast tissue.
Claim 8
Dependent Claim
14 words
A phantom as claimed in claim 6 wherein said fibers are formed from nylon.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-03-10 | 1995-09-09 | 1996-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-10 | 1999-09-09 | 2000-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-10 | 2003-09-09 | 2004-03-10 | $7700.00 | Window Closed / Lapsed |