US4724110A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a test phantom
Assignee: Individual
•
Filing: 1987-02-24
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Granted: 1988-02-09
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Expires: 2007-02-24
Abstract
Abstract Method for making a test phantom and is disclosed which phantom is representative of human tissue containing variable concentrations of iodine to serve as a test device for assessing the performance of X-ray imaging systems such as digital subtraction angiographic apparatus. An iodine/polymer insert is embedded in a polyurethane composition which has X-ray adsorption characteristics similar to human body tissue. 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
2026-10-28 05:15
CPC Classifications
A; A61; A61B; A61B6/00; A61B6/58; A61B6/582; A61B6/583; G; G09; G09B; G09B23/00; G09B23/28
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
74 words
A method of fabricating an X-ray test device comprising the steps of: mixing a material having X-ray absorption and attenuation properties substantially equivalent to human tissue with a stable chemical compound containing elemental iodine; molding said mixture into a test detail; and inserting said test detail into a mold filled with a quantity of said substantially human-tissue equivalent material to embed said test detail in a stabilized condition within said substantially human-tissue equivalent material.
Claim 2
Independent Claim
74 words
A method of fabricating an X-ray test device comprising the steps of: mixing a material having X-ray absorption and attenuation properties substantially equivalent to human tissue with a stable chemical compound containing elemental iodine; molding said mixture into a test detail; and inserting said test detail into a mold filled with a quantity of said substantially human-tissue equivalent material to embed said test detail in a stabilized condition within said substantially human-tissue equivalent material.
Claim 3
Dependent Claim
35 words
The method of claim 1 wherein said mixing step comprises the further steps of: heating said iodine containing material to an elevated temperature under vacuum to remove any moisture and gas existing in said material.
Claim 4
Dependent Claim
23 words
The method of claim 2 wherein said molding step comprises molding said mixture into a configuration simulating the configuration of human blood vessels.
Claim 5
Dependent Claim
53 words
The method of claim 3 wherein between said molding and inserting steps said method comprises the further steps of: partially filling said mold with a quantity of said substantially human-tissue equivalent material; and forming at least one recess within said human-tissue equivalent material sized in a complimentary configuration to said molded test detail.
Claim 6
Dependent Claim
57 words
The method of claim 4, wherein said inserting step comprises the further steps of: moderately heating said partially filled mold to a temperature sufficient to cause an expansion of said at least one recess; coating said test detail with a thin covering of liquidized substantially human-tissue equivalent material; and pressing said coated test detail into said recess.
Claim 7
Dependent Claim
34 words
The method of claim 5 comprising the further step of completely filling said mold with a quantity of said substantially human-tissue equivalent material to encapsulate said test detail within said substantially human-tissue equivalent material.
Claim 8
Dependent Claim
14 words
The method of claim 6 wherein said substantially human-tissue equivalent material comprises aliphatic polyurethane.
Claim 9
Dependent Claim
15 words
The method of claim 7 wherein said stable chemical compound containing elemental iodine comprises polyvinylpyrrolidone-iodine.
References Cited (Backward Citations)
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US4472829A
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US4646334A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-02-08 | 1991-08-10 | 1992-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-08 | 1995-08-10 | 1996-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-08 | 1999-08-10 | 2000-02-09 | $7700.00 | Window Closed / Lapsed |