XXI
New Patents
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5303707 MAGNETIC RESONANCE METHODS AND APPARATUS Ian R Young, Marlborough, United Kingdom assigned to Picker International Ltd A magnetic resonance method and apparatus for the microscopic examination of an internal region of a body (3) wherein a probe (25) is located in the body adjacent the region during the examination, and spatial encoding of r.f. signals resulting for excitation of magnetic resonance in the region is effected by a magnetic field gradient produced in the region by a coil arrangement carried by the probe.
5304929 NUCLEAR MAGNETIC RESONANCE TOMOGRAPHY APPARATUS OPERABLE WITH A PULSE SEQUENCE ACCORDING TO THE ECHO PLANAR METHOD Ming Fang, Ralf Ladebeck, Franz Schmitt, Michael Stehling assigned to Siemens Aktiengesellschaft In nuclear magnetic resonance tomography apparatus operable with a pulse sequence according to the echo-planar method, only a part of the k-space is scanned in the phase-coding direction per data acquisition, i.e., per radiofrequency excitation pulse. A phase-coding gradient is used such that regions of the k-space which are interleaved relative to each other are scanned in successive data acquisitions in the phase-coding direction. The number of echoes employed for the raw data matrix, and thus the resolution in phase-coding direction, or the length of the individual pulses of the read-out gradient, and thus the resolution in read-out direction, can thereby be enhanced.
5304930 5304928 METHOD OF MAGNETIC RESONANCE IMAGING Ryuzaburo Takeda, Hitachi Ltd
Mito,
REMOTELY
POSITIONED SYSTEM
MRI
Christopher Crowley, Freeman H Rose assigned to Panacea Medical Laboratories
Japan assigned to
A novel method of magnetic resonance imaging is disclosed, in which a single high-frequency magnetic field signal synthesized from a plurality of high-frequency components associated with a plurality of slice sections respectively is applied to a subject to excite the slice sections at the same time, and a phase encode pulse is applied in the direction perpendicular to a slice section. Information corresponding to the position of a slice section is applied to the phase of an excited spin and a measurement signal is subjected to Fourier transformation thereby to produce a data corresponding to each slice section. The phases of a plurality of high-frequency components of a high-frequency magnetic field signal are controlled to be in a predetermined relationship to each other at a predetermined timing.
A remotely positionable device for use in magnetic resonance imaging includes a magnet which is juxtaposable against the object to be imaged without actually surrounding to object. When so positioned, the magnet generates a static nonhomogeneous magnetic field having a determinable measurement surface wherein both the magnitude and the gradient of the field are substantially constant. Additionally, the device includes an RF antenna for periodically pulsing nuclei in the measurement surface with pulses of the Larmor frequency to initially tilt the nuclei and to subsequently refocus the nuclei. The device also includes a pair of gradient coils which generate a gradient fields that are superposed on the static field to encode the nuclei. The RF antenna subsequently receives a plurality of encoded spin echo signals from the refocussed nuclei which are averaged by a computer to create a