US4841247A
Expired / Lapsed
US
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Method for interpolative extension of nuclear magnetic resonance image
Assignee: Mitsubishi Electric Corp
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Filing: 1988-05-31
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Granted: 1989-06-20
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Expires: 2008-05-31
Abstract
Abstract A nuclear magnetic resonance image used for detecting the internal state of a substance is obtained through a phenomenon of nuclear magnetic resonance, which is spin resonance of atomic nuclei, by two-dimensionally sampling a nuclear magnetic resonance signal representative of the information of atomic nuclei in a test piece and then changing the two-dimensional data by two-dimensional Fourier transformation. Interpolative extension of the image is achieved without causing any reduction of the resolution by, in execution of such Fourier transformation, zero-filling the data in at least one of the column and row directions in accordance with the extension rate and increasing the number of the two-dimensional data.
Inventors
- 👤 Hidenobu Itagaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:56
CPC Classifications
G; G06; G06T; G06T3/00; G06T3/40; G06T3/4084; G01; G01R; G01R33/00; G01R33/20; G01R33/44; G01R33/48; G01R33/54; G01R33/56
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
92 words
A method for extending a two-dimensional nuclear magnetic image array filled with sampling data obtained by the step of two-dimensionally sampling a nuclear magnetic resonance signal representative of a predetermined characteristic of specific atomic nuclei in a test piece, comprising the steps of: creating a two-dimensional extension array which is larger than said image array and which has a portion equal in size to and containing said sampling data from said image array; zero filling all of said extension array other than said portion thereof; and thereafter two-dimensionally Fourier-transforming said extension array.
Claim 2
Independent Claim
92 words
A method for extending a two-dimensional nuclear magnetic image array filled with sampling data obtained by the step of two-dimensionally sampling a nuclear magnetic resonance signal representative of a predetermined characteristic of specific atomic nuclei in a test piece, comprising the steps of: creating a two-dimensional extension array which is larger than said image array and which has a portion equal in size to and containing said sampling data from said image array; zero filling all of said extension array other than said portion thereof; and thereafter two-dimensionally Fourier-transforming said extension array.
Claim 3
Dependent Claim
28 words
The method of claim 1, wherein said extension array has four quadrants of equal size, and wherein one of said quadrants is said portion of said extension array.
Claim 4
Dependent Claim
22 words
The method of claim 1, including after said step of Fourier-transforming the step of determining the absolute value of said extension array.
Claim 5
Dependent Claim
17 words
The method of claim 1, wherein said predetermined characteristic is one of spin density and relaxation time.
Claim 6
Dependent Claim
24 words
The method of claim 1, wherein said image array is an M×M array, said extension array is an N x N array, and N>M.
Claim 7
Dependent Claim
7 words
The method of claim 5, wherein N=2M.
Claim 8
Independent Claim
138 words
A method of processing nuclear magnetic image data, comprising the steps of: obtaining a first predetermined number of data samples by sampling a nuclear magnetic resonance signal representative of a predetermined characteristic of specific atomic nuclei in a test piece; creating an extension array having a second predetermined number of elements, said second predetermined number being larger than said first predetermined number, and said extension array including an image portion which is an array and which includes a plurality of said elements equal in number to said first predetermined number and each containing a respective said data sample; setting each said element of said array other than said elements in said image portion thereof to zero; thereafter two-dimensionally Fourier transforming said extension array; and thereafter displaying each of said second predetermined number of elements of said expansion array.
Claim 9
Independent Claim
138 words
A method of processing nuclear magnetic image data, comprising the steps of: obtaining a first predetermined number of data samples by sampling a nuclear magnetic resonance signal representative of a predetermined characteristic of specific atomic nuclei in a test piece; creating an extension array having a second predetermined number of elements, said second predetermined number being larger than said first predetermined number, and said extension array including an image portion which is an array and which includes a plurality of said elements equal in number to said first predetermined number and each containing a respective said data sample; setting each said element of said array other than said elements in said image portion thereof to zero; thereafter two-dimensionally Fourier transforming said extension array; and thereafter displaying each of said second predetermined number of elements of said expansion array.
Claim 10
Dependent Claim
25 words
The method of claim 7, wherein said image portion is an M x M array, said extension array is an N×N array, and N >M.
Claim 11
Dependent Claim
7 words
The method of claim 8, wherein N=2M.
Claim 12
Dependent Claim
27 words
The method of claim 7, including after said Fourier transforming step and before said displaying step the step of taking the absolute value of said extension array.
Claim 13
Dependent Claim
27 words
The method of claim 7, wherein said image portion is a P×Q array and said extension array is an R×S array, where R≧P, and S≧Q, and RS>PQ.
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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) | 1992-06-19 | 1992-12-19 | 1993-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-19 | 1996-12-19 | 1997-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-19 | 2000-12-19 | 2001-06-20 | $7700.00 | Window Closed / Lapsed |