| A Low-Cost, High Quality MRI Breast Scanner Using Prepolarization |
OCT 2000 |
23 pages |
| Authors:
Albert Macovski; STANFORD UNIV CA
|
 | Magnetic Resonance Imaging (MRI) has been shown to be more sensitive and equally specific when compared to x-ray mammography for detecting breast cancer. MRI is non-invasive, completely non-toxic, and requires no uncomfortable breast compression. But an x-ray mammogram costs about $100 whereas an MRI study costs about $1500. The exam cost is related to the scanners manufacturing cost (about $400,000) and sale price (about $1 to $3 Million). X-ray mammography ... |
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| A Low-Cost, High Quality MRI Breast Scanner Using Prepolarization |
OCT 1999 |
30 pages |
| Authors:
Albert Macovski; STANFORD UNIV CA
|
| Magnetic Resonance Imaging (MRI) has been shown to be more sensitive and equally specific when compared to x-ray mammography for detecting breast cancer. MRI is non-invasive, completely non-toxic, and requires no uncomfortable breast compression. But an x-ray mammogram costs about $100 whereas an MRI study costs about $1,500. The exam cost is related to the scanner's manufacturing cost (approx. $400,000), and sale price ($1-3M). X-ray mammography units cost about one ... |
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| SIMULTANEOUS NMR IMAGING SYSTEM - PATENT 4,639,671 |
JAN 87 |
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| Authors:
Albert Macovski
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| NMR IMAGING SYSTEM USING EXCITED REFERENCE COILS - PATENT 4,623,843 |
NOV 86 |
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| Authors:
Albert Macovski
|
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| HIGH-SPEED NMR IMAGING SYSTEM - PATENT 4,579,121 |
APR 86 |
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| Authors:
Albert Macovski
|
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| ENERGY-SELECTIVE RECORDING AND READOUT SYSTEM - PATENT 4,578,803 |
MAR 86 |
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| Authors:
Albert Macovski
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| A FRAMEWORK FOR SPECTRAL ARTIFACT CORRECTIONS IN X-RAY CT |
FEB 81 |
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| Authors:
J. Peter Stonestrom; robert e. alvarez; Albert Macovski
|
 | the spectral artifact problem in x-ray computed tomography (ct) is well known. many techniques have been suggested to correct for this problem, including linearization methods, iterative methods, and dual spectrum methods. in this paper two goals are addressed: (1) we review the various methods now being used to correct for spectral artifacts, and (2) we introduce a framework which provides useful insight as to the suitability of particular methods to ... |
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| ULTRASONIC DIAGNOSTIC INSTRUMENTS |
OCT 80 |
|
| Authors:
Richard L. Popp; Albert Macovski
|
| the underlying physical principles and current limitations of diagnostic ultrasonic instruments are reviewed. recently developed ultrasonic imaging devices using pulsed-reflected ultrasound are discussed in detail. these instruments transmit short trains of 1.5- to 10-megahertz sound. echoes reflected from tissue are converted to electrical signals, which are presented on a dispaly device to outline the contour of tissues and organs within the body. the physical resolution of the system is dependent ... |
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| MAGNETOSTRICTIVE IMAGING SYSTEMS |
JUN 78 |
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| Authors:
David Dameron; Albert Macovski
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| many ferromagnetic materials, especially nickel and certain ferrites, demonstrate magnetostrictive properties, i.e., they undergo a change in length along the direction of an applied magnetic field. this phenomenon is used to form an imaging system, using both electromagnetic and ultrasonic waves, with many characteristics different from the normal pulse-echo ultrasonic system. magnetostrictive particles are placed in the region of the body to be imaged, for example, a colloidal suspension in ... |
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| high-resolution b-scan systems using a circular array |
75 |
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| Authors:
Albert Macovski; stephen j. norton
|
| the desirable characteristics of an improved cross-sectional or b- scan imaging system include diffraction--limited lateral resolution in both dimensions at all depths, large-aperture receiver sensitivity, and real-time imaging. no b-scan system, in use or published, meets all of these desirable traits. some array systems are proposed in this paper which attempt to meet all of these characteristics in a relatively simple structure. (author) |
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