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:
May. 14, 2002
Filed:
Mar. 10, 2000
Daniel Gagnon, Twinsburg, OH (US);
Chi-Hua Tung, Aurora, OH (US);
Philips Medical Systems (Cleveland ), Inc., Highland Heights, OH (US);
Abstract
An asymmetric sampling scheme for use with a nuclear medicine gamma camera facilitates collection of a full set of higher resolution emission data and lower resolution transmission data with one complete 360° rotation of the gantry. The gantry ( ) contains a plurality of radiation detectors ( ) and at least one adjustably mounted radiation source ( ). During a scan, the gantry ( ) is incrementally rotated about a subject receiving aperture ( ) by a predetermined step size throughout a first 180° of a rotation (P , . . . , P ). The gantry ( ) is then rotated about the subject receiving aperture ( ) by one-half the predetermined step size (P or P ). The gantry ( ) is then incrementally rotated about the subject receiving aperture ( ) by the predetermined step size throughout the remaining 180° of the scan (P , . . . , P ). Emission data collected during the second half of the scan (P , . . . , P ) is interleaved into the data from the first half of the scan. Such sampling reduces overall scan time by cutting the number of steps approximately in half, therefore, eliminating 50% of the dead time while the gantry rotates and comes to rest.