US4649561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Test phantom and method of use of same
Assignee: Individual
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Filing: 1983-11-28
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Granted: 1987-03-10
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Expires: 2003-11-28
Abstract
Abstract A test phantom and method of fabrication and use of the same is disclosed which phantom is representative of human tissue containing variable concentrations of iodine to serve as a test device in for assessing the performance of X-ray imaging systems such as digital subtraction angiographic apparatus. The method of fabrication provides the long-term stable incorporation of iodine into a tissue equivalent material which allows standardized testing and evaluation of X-ray imaging systems. The incorporation of additional test details into geometrically fixed positions in the phantom allows accurate and reproduceable measurements of other performance parameters of digital X-ray imaging systems.
Inventors
- 👤 Ben A. Arnold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:13
CPC Classifications
A; A61; A61B; A61B6/00; A61B6/58; A61B6/582; A61B6/583; G; G09; G09B; G09B23/00; G09B23/28; G09B23/286
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
109 words
A comprehensive X-ray apparatus test device comprising: a base block sized to be positioned upon a support table of the X-ray apparatus; a plate-like member formed to be removably mounted in a generally contiguous orientation upon said base block; a plurality of test details disposed within said plate-like member; and means for reproducibly aligning said base block with said plate-like member in said generally contiguous orientation, said base block and plate-like member being formed of a urethane material possessing X-ray absorption properties substantially similar to human soft tissue and; said test details being formed of a stable iodine bearing material capable of maintaining its concentration value over prolonged use.
Claim 2
Dependent Claim
109 words
A comprehensive X-ray apparatus test device comprising: a base block sized to be positioned upon a support table of the X-ray apparatus; a plate-like member formed to be removably mounted in a generally contiguous orientation upon said base block; a plurality of test details disposed within said plate-like member; and means for reproducibly aligning said base block with said plate-like member in said generally contiguous orientation, said base block and plate-like member being formed of a urethane material possessing X-ray absorption properties substantially similar to human soft tissue and; said test details being formed of a stable iodine bearing material capable of maintaining its concentration value over prolonged use.
Claim 3
Dependent Claim
27 words
The device of claim 1 wherein said plurality of test details further comprises a contrast ratio test detail for measuring and comparing the scatter of the X-rays.
Claim 4
Dependent Claim
38 words
The device of claim 2 wherein the plurality of test details further comprising a lead member for testing linearity and time jitter of video components; and a plurality of orthogonal strips, said strips disposed in varying spatial frequencies.
Claim 5
Dependent Claim
44 words
The device of claim 3 wherein the plurality of test details further comprise a lead bar resolution test pattern detail for testing X-ray scatter, said test pattern detail totally absorbing metal strip having a sharp edge and being formed of an X-ray absorbing material.
Claim 6
Dependent Claim
37 words
The device of claim 4 further comprising a dynamic range copper step wedge detail for testing white to black video signals, said dynamic range copper step wedge detail further comprises a plurality of equal thickness copper strips.
Claim 7
Dependent Claim
31 words
The device of claim 5 further comprising an air contrast test detail to provide an absolute densitometer reference, said detail further comprising the test disk being formed to create a void.
Claim 8
Dependent Claim
12 words
The device of claim 6 wherein said urethane material comprises aliphatic urethane.
Claim 9
Dependent Claim
17 words
The device of claim 7 wherein said iodine/urethane mixture comprises a mixture of aliphatic urethane and polyvinylpyrrolidone-iodine.
Claim 10
Dependent Claim
75 words
A comprehensive X-ray apparatus test device comprising: a disc-like member formed to be removably mounted upon a support table of an X-ray apparatus; and an iodine bearing detail disposed within said disc-like member in a stabilized condition; said iodine-bearing detail being formed of a polyvinylpyrrolidone-iodine material, which maintains its concentration values over prolonged use; and said disc-like member being formed of a substantially human tissue equivalent material with respect to X-ray attenuation and absorption characteristics.
Claim 11
Dependent Claim
75 words
A comprehensive X-ray apparatus test device comprising: a disc-like member formed to be removably mounted upon a support table of an X-ray apparatus; and an iodine bearing detail disposed within said disc-like member in a stabilized condition; said iodine-bearing detail being formed of a polyvinylpyrrolidone-iodine material, which maintains its concentration values over prolonged use; and said disc-like member being formed of a substantially human tissue equivalent material with respect to X-ray attenuation and absorption characteristics.
Claim 12
Dependent Claim
22 words
The device of claim 9 wherein said iodine bearing detail comprises a plurality of iodine bearing details having differing stable iodine concentrations.
Claim 13
Dependent Claim
17 words
The device of claim 10 wherein said plural stable iodine bearing details are formed in differing configurations.
Claim 14
Dependent Claim
14 words
The device of claim 11 wherein said substantially human-equivalent material comprises a urethane material.
Claim 15
Dependent Claim
14 words
The device of claim 12 wherein said urethane material comprises an aliphatic urethane material.
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) | 1990-03-09 | 1990-09-08 | 1991-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-09 | 1994-09-08 | 1995-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-09 | 1998-09-08 | 1999-03-10 | $7700.00 | Window Closed / Lapsed |