 Software-based resolver-to-digital converter |
| In accordance with the teachings of the present invention, a software-based resolver-to-digital ... |
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| Pyramid processor integrated circuit |
| The invention is described below with reference to an exemplary pyramid IC and to FIGS. 1-11. W... |
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| Method for generating non-visible window edges in image compositing systems |
| The invention is a method used with a system for compositing a foreground scene including a subject ... |
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| Modulator circuit for use with a plurality of operating standards |
| OF THE PREFERRED EMBODIMENT Referring firstly to FIG. 1, a modulator 2 in accordance with a ... |
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| Circuit arrangement for demodulating an intermediate-frequency video signal |
| It is an object of the invention to improve the circuit arrangement of the type described in the ... |
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| Sealed end cap mounting for laminated insulator core |
| The present invention provides an insulator comprising a pair of fixing caps and an elongate core ... |
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| Image processing apparatus |
| What is claimed is: 1. An image processing apparatus comprising: A/D converter means for converting ... |
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| Photographing apparatus balancing brightness for microscopes |
| It is, therefore, an object of the present invention to provide a photographing apparatus for ... |
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| Automatic focus control for a microscope |
| The object of the present invention is a process and an apparatus which obviates this disadvantage. ... |
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Method and apparatus for high speed magnetic resonance imaging with improved image quality
| Details |
Inventors: Kanayama, Shoichi; Kuhara, Shigehide; Sato, Kozo;
Assignee: Kabushiki Kaisha Toshiba (Kawasaki, JP)
Primary Examiner: Arana; Louis
Assistant Examiner:
Attorney, Agent or Firm: Oblon, Spivak, McClelland, Maier & Neustadt
A nuclear magnetic resonance imaging method and apparatus, capable of obtaining images with high spatial resolution arid S/N ratio, reducing the influence of the inhomogeneity of the static magnetic field and the chemical shift artifacts, and improving the contrast in the T.sub.2 enhanced image and T.sub.1 enhanced image. The imaging uses the pulse sequence, including: application of RF pulses and slicing gradient magnetic field for exciting a desired region of the body to be examined; application of reading gradient magnetic fields which regularly fluctuate between a negative value and a positive value; application of initial phase encoding gradient magnetic field before the reading gradient magnetic field is applied; application of a predetermined pulse shaped phase encoding gradient magnetic field every time the reading gradient magnetic field changes polarity; and collection of the echo signals emitted from the desired region every time the reading gradient magnetic field changes polarity. This pulse sequence is repeated while sequentially changing a setting of the initial phase encoding gradient magnetic field applied. |
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DETAILED DESCRIPTION It is therefore an object of the present invention to provide a method and an apparatus for magnetic resonance imaging, capable of obtaining the images with high spatial resolution and S/N ratio.
It is another object of the present invention to provide a method and an apparatus for magnetic resonance imaging, capable of reducing the influence of the.
inhomogeneity of the static magnetic field.
It is another object of the present invention to provide a method and an apparatus for magnetic resonance imaging, capable of reducing the chemical shift artifacts.
It is another object of the present invention to provide a method and an apparatus for magnetic resonance imaging, capable of improving the contrast in the T.
sub.
2 enhanced image and T.
sub.
1 enhanced image.
According to one aspect of the present invent lion there is provided a method of magnetic resonance imaging, comprising the steps of: (a) placing an object to be examined in a static magnetic field; (b) carrying out a pulse sequence, including: (b1) applying RF pulses and slicing gradient magnetic field for exciting a desired imaging region in the body to be examined; (b2) applying reading gradient magnetic field which regularly fluctuates between a negative value and a positive value onto the body to be examined; (b3) applying initial phase encoding gradient magnetic field for specifying a partial region in a k-space, onto the body to be examined before the reading gradient magnetic field is applied in step (b3); (b4) applying a predetermined pulse shaped phase encoding gradient magnetic field onto the body to be examined, every time the reading gradient magnetic field changes polarity; and (b5) collecting echo signals for the, region in the k-space emitted from the desired imaging region, every time the reading gradient magnetic field changes the polarity; (c) repeating the pulse sequence of the step (b) for a plurality of times, with sequentially changing a setting of the initial phase encoding gradient magnetic field applied at the step (b3), such that the signals are collected for an entire region of the k-space; and (d) reconstructing MR images from the echo signals for the entire region of the k-space collected in step (b5) by a repeated application of the pulse sequence of stem (b)
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Image Analysis 
