US5444756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
X-ray machine, solid state radiation detector and method for reading radiation detection information
Assignee: 3M Co
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Filing: 1994-08-17
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Granted: 1995-08-22
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Expires: 2014-08-17
Abstract
Abstract A solid state radiation detector having an improved method of reading data from individual sensors and an x-ray machine configured with such a solid state radiation detector. At least one sensor of the solid state radiation detector is designated as a reference sensor. The output of the reference sensor is read until it reaches a predetermined threshold. Once the threshold has been reached, a timer determines when the predetermined x-ray exposure time is completed. Upon completion, the sensors of the solid state radiation sensor are read. Thus, all sensors may be read at the proper time to achieve maximum output in spite of an unknown and variable warm-up period for the x-ray tube following activation and possibly an unknown exposure time. Alternatively, once the output of the reference has reached the predetermined threshold, the output of that reference continues to be monitored to determine when the output of the reference sensor falls below a second predetermined threshold. At approximately that time, all sensors of the solid state radiation detector are read.
Inventors
- 👤 Joseph Y. Pai
- 👤 Choon-Woo Kim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:03
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/16; G01T1/20; G01T1/2018; G01T1/20181; G01T1/20182; G01T1/20188; G01T1/2019; H; H04; H04N; H04N23/00; H04N23/30; H04N25/00; H04N25/30; H05; H05G; H05G1/00; H05G1/08; H05G1/60; H10; H10F; H10F30/00; H10F30/10
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
303 words
An x-ray machine for producing an x-ray, comprising: an x-ray tube powered by electrical power and producing x-ray radiation, said x-ray tube having a variable warm-up time period; a controller for controlling said x-ray tube controlling an exposure time for said x-ray radiation; a layer of phosphor receiving said x-ray radiation and producing an output based upon the amount of said x-ray radiation received; a solid state radiation detector having a plurality solid state sensors arranged in an array of sensors consisting of a plurality of rows and a plurality of columns, said detector responsive to said output of said layer of phosphor, each of said plurality of solid state sensors producing an output; at least one solid state reference sensor; sensing means coupled to each of said plurality of solid state sensors and to said solid state reference sensor for sensing said output of said solid state sensors; said sensing means reading said output of said reference sensor at a time t 1 ; said controller applying said electrical power to said x-ray tube at said time t 1 ; said sensing means continuing to read said output of said reference sensor after time t 1 and determining a time t 2 based upon said output of said reference sensor at time t 2 as compared with said output of said reference sensor at time t 1 ; said sensing means reading said output of said plurality of solid state sensors at time t 3 which is equal to said time t 2 plus said exposure time; and recording means responsive to said sensing means for recording the value of said output of said plurality of solid state sensors at time t 3 ; whereby an x-ray image is produced in spite of said x-ray tube having a variable warm-up time period.
Claim 2
Dependent Claim
303 words
An x-ray machine for producing an x-ray, comprising: an x-ray tube powered by electrical power and producing x-ray radiation, said x-ray tube having a variable warm-up time period; a controller for controlling said x-ray tube controlling an exposure time for said x-ray radiation; a layer of phosphor receiving said x-ray radiation and producing an output based upon the amount of said x-ray radiation received; a solid state radiation detector having a plurality solid state sensors arranged in an array of sensors consisting of a plurality of rows and a plurality of columns, said detector responsive to said output of said layer of phosphor, each of said plurality of solid state sensors producing an output; at least one solid state reference sensor; sensing means coupled to each of said plurality of solid state sensors and to said solid state reference sensor for sensing said output of said solid state sensors; said sensing means reading said output of said reference sensor at a time t 1 ; said controller applying said electrical power to said x-ray tube at said time t 1 ; said sensing means continuing to read said output of said reference sensor after time t 1 and determining a time t 2 based upon said output of said reference sensor at time t 2 as compared with said output of said reference sensor at time t 1 ; said sensing means reading said output of said plurality of solid state sensors at time t 3 which is equal to said time t 2 plus said exposure time; and recording means responsive to said sensing means for recording the value of said output of said plurality of solid state sensors at time t 3 ; whereby an x-ray image is produced in spite of said x-ray tube having a variable warm-up time period.
Claim 3
Dependent Claim
50 words
An x-ray machine as in claim 1 wherein said sensing means determines said time t 2 by determining the time at which the value of said output of said reference sensor minus the value of said output of said reference sensor at time t 1 first exceeds a predetermined threshold.
Claim 4
Dependent Claim
208 words
A solid state radiation detector adapted to detect radiation from a radiation source having a variable initialization period following a time t 1 , comprising: an array of solid state sensors consisting of a plurality of rows and a plurality of columns and adapted to be responsive to radiation from said radiation source, each of said solid state sensors producing an output; at least one solid state reference sensor; sensing means coupled to each of said solid state sensors and to said solid state reference sensor for sensing said output of said solid state sensors; said sensing means reading said output of said reference sensor at said time t 1 ; said sensing means reading said output of said reference sensor after time t 1 and determining a time t 2 based upon said output of said reference sensor as compared with said output of said reference sensor at time t 1 ; said sensing means reading said output of said solid state sensors at a time t 3 which is equal to said time t 2 plus said exposure time; and recording means responsive to said sensing means for recording the value of said output of said plurality of solid state sensors at time t 3 .
Claim 5
Dependent Claim
208 words
A solid state radiation detector adapted to detect radiation from a radiation source having a variable initialization period following a time t 1 , comprising: an array of solid state sensors consisting of a plurality of rows and a plurality of columns and adapted to be responsive to radiation from said radiation source, each of said solid state sensors producing an output; at least one solid state reference sensor; sensing means coupled to each of said solid state sensors and to said solid state reference sensor for sensing said output of said solid state sensors; said sensing means reading said output of said reference sensor at said time t 1 ; said sensing means reading said output of said reference sensor after time t 1 and determining a time t 2 based upon said output of said reference sensor as compared with said output of said reference sensor at time t 1 ; said sensing means reading said output of said solid state sensors at a time t 3 which is equal to said time t 2 plus said exposure time; and recording means responsive to said sensing means for recording the value of said output of said plurality of solid state sensors at time t 3 .
Claim 6
Dependent Claim
52 words
A solid state radiation detector as in claim 3 wherein said sensing means determines said time t 2 by determining the time at which the value of said output of said reference sensor minus the value of said output of said reference sensor at time t 1 first exceeds a predetermined threshold.
Claim 7
Dependent Claim
21 words
A solid state radiation detector as in claim 4 wherein said initialization period comprises a warm-up period of said radiation source.
Claim 8
Dependent Claim
135 words
A solid state radiation detector adapted to detect radiation from a radiation source having a variable initialization period, said radiation source intended to expose said radiation detector for a predetermined exposure time, comprising: a plurality solid state sensors arranged in an array of sensors adapted to be responsive to radiation from said radiation source, each of said plurality of solid state sensors producing an output; at least one of said plurality of solid state sensors being designated a reference sensor; determining means for determining when said radiation source has completed said initialization period by monitoring said output of said reference detector; and reading means for reading said output of said plurality of solid state sensors when said determining means determines that said warm-up period has been completed and said predetermined exposure period has been completed.
Claim 9
Dependent Claim
135 words
A solid state radiation detector adapted to detect radiation from a radiation source having a variable initialization period, said radiation source intended to expose said radiation detector for a predetermined exposure time, comprising: a plurality solid state sensors arranged in an array of sensors adapted to be responsive to radiation from said radiation source, each of said plurality of solid state sensors producing an output; at least one of said plurality of solid state sensors being designated a reference sensor; determining means for determining when said radiation source has completed said initialization period by monitoring said output of said reference detector; and reading means for reading said output of said plurality of solid state sensors when said determining means determines that said warm-up period has been completed and said predetermined exposure period has been completed.
Claim 10
Independent Claim
176 words
A method of reading radiation detection information from a solid state radiation detector having a plurality solid state sensors arranged in an array consisting of a plurality of rows and a plurality of columns, each of said plurality of solid state sensors producing an output, said radiation detector being responsive to radiation from a radiation source having a variable initialization period beginning at a time t 1 , comprising the steps of: designating at least one of said plurality of solid state sensors as a reference sensor; sensing said output of said reference sensor at and following said time t 1 ; determining a time t 2 based upon said output of said reference sensor as compared with said output of said reference sensor at time t 1 ; reading said output of said plurality of solid state sensors at a time t 3 which is equal to said time t 2 plus said exposure time; and recording the value of said output of said plurality of solid state sensors at said time t 3 .
Claim 11
Independent Claim
176 words
A method of reading radiation detection information from a solid state radiation detector having a plurality solid state sensors arranged in an array consisting of a plurality of rows and a plurality of columns, each of said plurality of solid state sensors producing an output, said radiation detector being responsive to radiation from a radiation source having a variable initialization period beginning at a time t 1 , comprising the steps of: designating at least one of said plurality of solid state sensors as a reference sensor; sensing said output of said reference sensor at and following said time t 1 ; determining a time t 2 based upon said output of said reference sensor as compared with said output of said reference sensor at time t 1 ; reading said output of said plurality of solid state sensors at a time t 3 which is equal to said time t 2 plus said exposure time; and recording the value of said output of said plurality of solid state sensors at said time t 3 .
Claim 12
Dependent Claim
49 words
A method as in claim 7 wherein said time t 2 in said determining step is determined by the time at which the value of said output of said reference sensor minus the value of said output of said reference sensor at time t 1 exceeds a predetermined threshold.
Claim 13
Dependent Claim
18 words
A method as in claim 8 wherein said initialization period comprises a warm-up period of said radiation source.
Claim 14
Independent Claim
127 words
A method of reading radiation detection information from a solid state radiation detector having a plurality solid state sensors, each of said plurality of solid state sensors producing an output, said radiation detector being responsive to radiation from a radiation source having a variable initialization period, said radiation source intended to expose said radiation detector for a predetermined exposure period, comprising the steps of: designating at least one of said plurality of solid state sensors as a reference sensor; determining when said radiation source has completed said initialization period by monitoring said output of said reference detector; reading said output of said plurality of solid state sensors when said determining step indicates that said warm-up period has been completed and said predetermined exposure period has been completed.
Claim 15
Independent Claim
127 words
A method of reading radiation detection information from a solid state radiation detector having a plurality solid state sensors, each of said plurality of solid state sensors producing an output, said radiation detector being responsive to radiation from a radiation source having a variable initialization period, said radiation source intended to expose said radiation detector for a predetermined exposure period, comprising the steps of: designating at least one of said plurality of solid state sensors as a reference sensor; determining when said radiation source has completed said initialization period by monitoring said output of said reference detector; reading said output of said plurality of solid state sensors when said determining step indicates that said warm-up period has been completed and said predetermined exposure period has been completed.
Claim 16
Dependent Claim
41 words
A method as in claim 10 wherein said determining step is accomplished by determining the time at which the value of said output of said reference sensor minus the value of said output of said reference sensor exceeds a predetermined threshold.
Claim 17
Dependent Claim
25 words
A method as in claim 11 wherein said initialization period comprises a warm-up period following an application of power to said solid state radiation detector.
Claim 18
Dependent Claim
202 words
An x-ray machine for producing an x-ray, comprising: an x-ray tube powered by electrical power and producing x-ray radiation, said x-ray tube having a variable warm-up time period following an activation time; a layer of phosphor receiving said x-ray radiation and producing an output based upon the amount of said x-ray radiation received; a solid state radiation detector having a plurality solid state sensors, said detector responsive to said output of said layer of phosphor, each of said plurality of solid state sensors producing an output; at least one reference sensor producing an output; sensing means coupled to each of said plurality of solid state sensors for sensing said output of said solid state sensors; determining means coupled to said output of said reference sensor for first determining when said output of said reference sensor exceeds a first predetermined threshold and then determining a readout time when said output of said reference sensor falls below a second predetermined threshold; recording means responsive to said sensing means for recording the value of said output of said plurality of solid state sensors at said readout time; whereby an x-ray image is produced in spite of said x-ray tube having a variable warm-up time period.
Claim 19
Dependent Claim
202 words
An x-ray machine for producing an x-ray, comprising: an x-ray tube powered by electrical power and producing x-ray radiation, said x-ray tube having a variable warm-up time period following an activation time; a layer of phosphor receiving said x-ray radiation and producing an output based upon the amount of said x-ray radiation received; a solid state radiation detector having a plurality solid state sensors, said detector responsive to said output of said layer of phosphor, each of said plurality of solid state sensors producing an output; at least one reference sensor producing an output; sensing means coupled to each of said plurality of solid state sensors for sensing said output of said solid state sensors; determining means coupled to said output of said reference sensor for first determining when said output of said reference sensor exceeds a first predetermined threshold and then determining a readout time when said output of said reference sensor falls below a second predetermined threshold; recording means responsive to said sensing means for recording the value of said output of said plurality of solid state sensors at said readout time; whereby an x-ray image is produced in spite of said x-ray tube having a variable warm-up time period.
Claim 20
Dependent Claim
143 words
A solid state radiation detector adapted to detect radiation from a radiation source having a variable initialization period following an activation time, comprising: an array of solid state sensors adapted to be responsive to radiation from said radiation source, each of said solid state sensors producing an output; at least one reference sensor producing an output; sensing means coupled to each of said solid state sensors for sensing said output of said solid state sensors; determining means coupled to said output of said reference sensor for first determining when said output of said reference sensor exceeds a first predetermined threshold and then determining a readout time when said output of said reference sensor falls below a second predetermined threshold; recording means responsive to said sensing means for recording the value of said output of said plurality of solid state sensors at readout time.
Claim 21
Dependent Claim
143 words
A solid state radiation detector adapted to detect radiation from a radiation source having a variable initialization period following an activation time, comprising: an array of solid state sensors adapted to be responsive to radiation from said radiation source, each of said solid state sensors producing an output; at least one reference sensor producing an output; sensing means coupled to each of said solid state sensors for sensing said output of said solid state sensors; determining means coupled to said output of said reference sensor for first determining when said output of said reference sensor exceeds a first predetermined threshold and then determining a readout time when said output of said reference sensor falls below a second predetermined threshold; recording means responsive to said sensing means for recording the value of said output of said plurality of solid state sensors at readout time.
Claim 22
Dependent Claim
21 words
A solid state radiation detector as in claim 14 wherein said initialization period comprises a warm-up period of said radiation source.
Claim 23
Dependent Claim
144 words
A solid state radiation detector adapted to detect radiation from a radiation source having a variable initialization period following an activation time, comprising: a plurality of solid state sensors arranged in an array adapted to be responsive to radiation from said radiation source, each of said plurality of solid state sensors producing an output; a reference sensor; sensing means coupled to each of said solid state sensors for sensing said output of said solid state sensors; determining means coupled to said output of said reference sensor for first determining when said output of said reference sensor exceeds a first predetermined threshold and then determining a readout time when said output of said reference sensor falls below a second predetermined threshold; recording means responsive to said sensing means for recording the value of said output of said plurality of solid state sensors at readout time.
Claim 24
Dependent Claim
144 words
A solid state radiation detector adapted to detect radiation from a radiation source having a variable initialization period following an activation time, comprising: a plurality of solid state sensors arranged in an array adapted to be responsive to radiation from said radiation source, each of said plurality of solid state sensors producing an output; a reference sensor; sensing means coupled to each of said solid state sensors for sensing said output of said solid state sensors; determining means coupled to said output of said reference sensor for first determining when said output of said reference sensor exceeds a first predetermined threshold and then determining a readout time when said output of said reference sensor falls below a second predetermined threshold; recording means responsive to said sensing means for recording the value of said output of said plurality of solid state sensors at readout time.
Claim 25
Independent Claim
118 words
A method of reading radiation detection information from a solid state radiation detector having a plurality solid state sensors and a reference sensor, each of said plurality of solid state sensors producing an output, said radiation detector being responsive to radiation from a radiation source having a variable initialization period following an activation time, comprising the steps of: sensing said output of said reference sensor following said activation time; determining when said output of said reference sensor exceeds a first predetermined threshold; then determining a readout time when said output of said reference sensor falls below a second predetermined threshold; and recording the value of said output of said plurality of solid state sensors at said readout time.
Claim 26
Independent Claim
118 words
A method of reading radiation detection information from a solid state radiation detector having a plurality solid state sensors and a reference sensor, each of said plurality of solid state sensors producing an output, said radiation detector being responsive to radiation from a radiation source having a variable initialization period following an activation time, comprising the steps of: sensing said output of said reference sensor following said activation time; determining when said output of said reference sensor exceeds a first predetermined threshold; then determining a readout time when said output of said reference sensor falls below a second predetermined threshold; and recording the value of said output of said plurality of solid state sensors at said readout time.
Claim 27
Dependent Claim
18 words
A method as in claim 17 wherein said initialization period comprises a warm-up period of said radiation source.
References Cited (Backward Citations)
US3934146A
Cited
US3986033A
Cited
US4101775A
Cited
US4176275A
Cited
US4905265A
Cited
US5105087A
Cited
US5144141A
Cited
US5340975A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-08-21 | 1999-02-20 | 1999-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-08-21 | 2003-02-20 | 2003-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-08-21 | 2007-02-20 | 2007-08-22 | $7700.00 | Window Closed / Lapsed |