The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 03, 2001
Filed:
Oct. 08, 1999
Gerardus B. J. Mulder, Eindhoven, NL;
Gerardus N. Peeren, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
In an MRI apparatus for medical purposes it is desirable to minimize the length of the magnet system for generating the main field, inter alia in order to keep the accessibility of the region to be examined in the imaging volume as high as possible for the attending staff. In order to save costs it is also desirable to make the diameter of the magnet system as small as possible. According to the invention a short, actively shielded magnet system is obtained in that the turns of the magnet system are situated in an imaginary U-shaped space,with the opening of the U facing the axis,. The current component in the bottom,of the U has a value which is smaller than that of the current component in the limbs,of the U. The inner space,of the U does not contain a current for generating a contribution to the main field in the measuring space,of the apparatus. Consequently, a free inner space is formed in the magnet system; this free space can be used, for example to accommodate gradient coils and/or RF coils.