发明名称 Imaging apparatus and methods.
摘要 <p>A radiation source (12, 216) rotates around a patient on a patient couch (30, 212) as the couch is advanced through an examination region (14, 214). Radiation detectors (24, 230) detect radiation that has passed through the patient along rays of a plurality of fan shaped views. Each view is identifiable by its angular position phi around the examination region and its longitudinal position R in the spiral and each ray is identifiable by its angular position beta in the fan. An interpolator (46) interpolates views collected over more than two revolutions of spiral path using an interpolation function (62, 94). A set of interpolated views is reconstructed (54, 250) into a series of image representations representing parallel planar slices through the imaged volume. In some reconstructions, particularly reconstructions in which a 180 DEG based reconstruction algorithm is used or the energy of the x-ray beam is varied, the filter function (82, 84, 86, 116, 118) is varied from ray to ray within each view. A projection filter can also be varied from view to view in order to emphasize structures along various axes of a subject. A cardiac or other physiological condition monitor (90) monitors for movement of the subject so that one or more of the rotational speed of the x-ray source (12, 216), movement of the patient couch (30, 212), energy of the x-ray beam, or filter function can be varied accordingly. <IMAGE></p>
申请公布号 EP0471455(A2) 申请公布日期 1992.02.19
申请号 EP19910306591 申请日期 1991.07.19
申请人 PICKER INTERNATIONAL, INC. 发明人 HEUSCHER, DOMINIC J.
分类号 A61B6/00;A61B6/03;G01T1/29;G06T11/00 主分类号 A61B6/00
代理机构 代理人
主权项
地址