公开(公告)号：US4963740A

公开(公告)日：1990-10-16

申请号：US321123

申请日：1989-03-09

Applicant: Eiichi Asai ,  Yoshiaki Yokoyama

Inventor： Eiichi Asai ,  Yoshiaki Yokoyama

IPC: G01N23/04 ,  A61B6/00 ,  G03C5/16 ,  G06T1/00 ,  H04N1/04 ,  H04N5/32 ,  H04N7/18

CPC classification number: G03C5/16 ,  H04N5/3205

Abstract: A subtraction processing method for radiation images comprises the steps of obtaining a masked image signal by reading out a masked image of an object recorded without injection of contrast media into a specific structure of the object, and obtaining a live image signal by reading out a live image recorded after contrast media have been injected into the specific structure of the object. The parts of the masked image signal and the live image signal corresponding to the same picture elements in the masked and live images are subtracted, thereby obtaining a difference signal for forming an image of the specific structure. In cases where different read-out conditions are used when obtaining the masked image signal and the live image signal, one of the masked image signal or the live image signal is converted into the image signal which would have been obtained if the same read-out conditions had been used for both images. Subtraction processing is then carried out after one of the image signals has been converted.

Abstract translation: 用于放射线图像的减法处理方法包括以下步骤：通过将未注射造影剂的物体的掩蔽图像读出到对象的特定结构中来获得掩蔽图像信号，并且通过读出实时获取实时图像信号 造影剂已被注入到物体的特定结构中后记录的图像。 屏蔽图像信号的部分和对应于被屏蔽和实时图像中的相同图像元素的实时图像信号被减去，从而获得用于形成特定结构的图像的差分信号。 在获得掩蔽的图像信号和实时图像信号时使用不同的读出条件的情况下，将掩蔽的图像信号或实况图像信号中的一个转换成如果相同的读出将被获得的图像信号 两种图像都使用了条件。 然后在转换了一个图像信号之后执行减法处理。