Patent US4755679A successfully refreshed from Google Patents.
US4755679A
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Method and apparatus for maximizing counts of a PET camera
Assignee: Individual
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Filing: 1986-06-19
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Granted: 1988-07-05
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Expires: 2006-06-19
Abstract
Abstract The method and apparatus of operating a positron emission tomography camera for measuring concentrations of positron emitting radioisotopes which measures radiation from a patient including true counts, scatter counts and random counts through an energy acceptance window in which the camera has a maximum camera transfer capability of measuring counts. The method and apparatus includes measuring the total counts of radiation and varying the energy acceptance window to accept the total counts available at the maximum camera transfer capability thereby minimizing the random and scattered counts and maximizing the true counts. The method further includes injecting an amount of radiation into the patient sufficient to initially saturate the maximum camera transfer capability. The energy acceptance window is varied by the measurement of total counts.
Inventors
- 👤 Wai-Hoi Wong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:06
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/29; G01T1/2914; G01T1/2985; A; A61; A61B; A61B6/00; A61B6/02; A61B6/03; A61B6/037
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
73 words
The method of operating a positron emission tomography camera for measuring concentrations of positron emitting radioisotopes which measure radiation from a patient including true counts, scatter counts and random counts through an energy acceptance window in which the camera has a maximum camera transfer capability of measuring counts comprising, measuring the total counts of radiation, and varying the energy acceptance window to accept the total counts available at the maximum camera transfer capability.
Claim 2
Independent Claim
73 words
The method of operating a positron emission tomography camera for measuring concentrations of positron emitting radioisotopes which measure radiation from a patient including true counts, scatter counts and random counts through an energy acceptance window in which the camera has a maximum camera transfer capability of measuring counts comprising, measuring the total counts of radiation, and varying the energy acceptance window to accept the total counts available at the maximum camera transfer capability.
Claim 3
Dependent Claim
24 words
The method of claim 1 including, injecting an amount of radiation into the patient normally sufficient to initially saturate the maximum camera transfer capability.
Claim 4
Dependent Claim
22 words
The method of claim 2 wherein the amount of injection radiation is a least four times the normal amount of injection radiation.
Claim 5
Dependent Claim
12 words
The method of claim 3 wherein the positron emitting radioisotope is Rb-82.
Claim 6
Dependent Claim
18 words
The method of claim 2 wherein the energy acceptance window is varied by the measurement of total counts.
Claim 7
Dependent Claim
57 words
In a positron emission tomography camera, the improvement comprising, means for measuring the total counts of radiation injected into a patient including true counts, random counts and scatter counter, and an energy acceptance window, said window controlled by the measuring means for varying the window for accepting the total counts measured at the maximum camera transfer capability.
Claim 8
Dependent Claim
57 words
In a positron emission tomography camera, the improvement comprising, means for measuring the total counts of radiation injected into a patient including true counts, random counts and scatter counter, and an energy acceptance window, said window controlled by the measuring means for varying the window for accepting the total counts measured at the maximum camera transfer capability.
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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) | 1991-07-05 | 1992-01-04 | 1992-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-05 | 1996-01-04 | 1996-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-05 | 2000-01-04 | 2000-07-05 | $7700.00 | Window Closed / Lapsed |