Patent US5953388A successfully refreshed from Google Patents.
US5953388A
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Method and apparatus for processing data from a tomographic imaging system
Assignee: George Mason University
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Filing: 1997-08-18
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Granted: 1999-09-14
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Expires: 2017-08-18
Abstract
Abstract An algorithm is created and applied to reconstruct the wavelet coefficients of an image from the Radon transform data for use in computed tomography, with a disclosed method that uses the properties of wavelets to localize the Radon transform such that a local region of the cross section of a body can be reconstructed using almost completely local data to significantly reduce the amount of exposure and computations in X-ray tomography. The described algorithm is based on the observation that for some wavelet bases with sufficiently many vanishing moments, the ramp-filtered version of the scaling function as well as the wavelet function has extremely rapid decay, with the variance of the elements of the nullspace is being negligible in the locally reconstructed image.
Inventors
- 👤 David Francis Walnut
- 👤 Carlos Alberto Berenstein
- 👤 K. J. Ray Liu
- 👤 Farrokh Rashid-Farrokhi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:08
CPC Classifications
G; G06; G06T; G06T12/00; G06T12/20; G06T2211/00; G06T2211/40; G06T2211/421; Y; Y10; Y10S; Y10S378/00; Y10S378/901
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
71 words
A method for processing data form a tomographic system to obtain an image of an object comprising the steps of (a) collecting tomographic data from a CT scan of said object; (b) processing said tomographic data to obtain sampled parallel beam data (c) computing modified wavelet and scaling filters; and (d) processing said sampled parallel beam data using said modified wavelet and scaling filters to construct an image of said object.
Claim 2
Independent Claim
71 words
A method for processing data form a tomographic system to obtain an image of an object comprising the steps of (a) collecting tomographic data from a CT scan of said object; (b) processing said tomographic data to obtain sampled parallel beam data (c) computing modified wavelet and scaling filters; and (d) processing said sampled parallel beam data using said modified wavelet and scaling filters to construct an image of said object.
Claim 3
Dependent Claim
14 words
A method of claim 1, wherein said object is contained within a larger body.
Claim 4
Dependent Claim
16 words
A method of claim 1, wherein said output is displayed as an image of said object.
Claim 5
Dependent Claim
22 words
A method of claim 1, wherein said tomographic data (b) is selected from a larger data set obtained from said CT scan.
Claim 6
Independent Claim
120 words
An apparatus for producing an image of a region contained within an object, said apparatus comprising: (a) a radiation source focusable on a region contained within an object and producing a focused radiation beam; (b) a receptor means for receiving said radiation beam form said radiation source, said radiation beam having passed through said region positioned between said radiation source and said receptor; (c) a converter means for converting said received radiation beam at the receptor to digitized data; (d) a computer means connected to said converter means comprising data processing means for converting said digitized data into a visual image; and (e) an output means connected to said computer means for displaying the output of said data processing means.
Claim 7
Independent Claim
120 words
An apparatus for producing an image of a region contained within an object, said apparatus comprising: (a) a radiation source focusable on a region contained within an object and producing a focused radiation beam; (b) a receptor means for receiving said radiation beam form said radiation source, said radiation beam having passed through said region positioned between said radiation source and said receptor; (c) a converter means for converting said received radiation beam at the receptor to digitized data; (d) a computer means connected to said converter means comprising data processing means for converting said digitized data into a visual image; and (e) an output means connected to said computer means for displaying the output of said data processing means.
Claim 8
Dependent Claim
15 words
An apparatus of claim 5, wherein said data processing means is a computer source code.
Claim 9
Dependent Claim
14 words
An apparatus of claim 5, wherein said data processing means is a logic circuit.
Claim 10
Dependent Claim
24 words
An apparatus of claim 5, wherein said focusable radiation source is effective to aim a fan-beam from said radiation source at said receptor means.
Claim 11
Dependent Claim
13 words
An apparatus of claim 5, wherein said radiation source is an X-ray source.
Claim 12
Dependent Claim
11 words
An apparatus of claim 5, wherein said region comprises an edge.
Claim 13
Dependent Claim
15 words
An apparatus of claim 5, wherein said data processing means comprises wavelet and scaling filters.
Claim 14
Independent Claim
83 words
An apparatus for producing an image of an object: (a) a radiation source producing a radiation beam; (b) a means for collecting data from said radiation source, wherein said data is collected after said radiation beam has passed through said object; (c) a first means for computing wavelet and scaling filters; (d) a second means for processing said data using wavelet and scaling filters effective to construct an image of said object; and (e) a display means for displaying an image said object.
Claim 15
Independent Claim
83 words
An apparatus for producing an image of an object: (a) a radiation source producing a radiation beam; (b) a means for collecting data from said radiation source, wherein said data is collected after said radiation beam has passed through said object; (c) a first means for computing wavelet and scaling filters; (d) a second means for processing said data using wavelet and scaling filters effective to construct an image of said object; and (e) a display means for displaying an image said object.
Claim 16
Dependent Claim
14 words
An apparatus of claim 12, wherein said data is collected as parallel beam data.
Claim 17
Dependent Claim
44 words
An apparatus of claim 12, wherein said data is collected as fan-beam data and said system further comprises a third means for converting fan-beam data into parallel beam data, which parallel beam data is processed using wavelet and scaling filters by said second means.
Claim 18
Dependent Claim
17 words
An apparatus of claim 12, wherein said radiation source is focusable to produce a focused radiation beam.
References Cited (Backward Citations)
US4044260A
Cited
US5576548A
Cited
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