X-ray or gamma ray systems or devices – Specific application – Absorption
Patent
1986-02-28
1987-06-09
Church, Craig E.
X-ray or gamma ray systems or devices
Specific application
Absorption
378 9, 378 22, 378901, 364414, G01N 2304
Patent
active
046726519
ABSTRACT:
An object is irradiated with respective cone-beam like X-rays from first and second directions. For each of the first and second directions are produced mask and live images as respective projection images of the object before and after a contrast medium reaches an interested part of the object. Then, subtraction of the mask image from the live image is made in conjunction with each of the first and second directions. The resulting subtraction image assumes a projection image of the distribution of the contrast medium in the interested part taken in the corresponding direction. The respective projection widths of such projection images of the contrast medium distribution are determined to generate an ellipse defined by the projection widths. The shape of this ellipse is corrected in accordance with individual data values in the projection images of the contrast medium, thereby providing a corrected shape accurately resembling the actual shape of the interested part of the object. The corrected shape of the interested part is displayed.
REFERENCES:
patent: 4228505 (1980-10-01), Wagner
patent: 4345158 (1982-08-01), Pfeites et al.
Horiba Isao
Iwata Akira
Matsuo Hiroshi
Suzumura Nobuo
Church Craig E.
Hitachi Medical Corporation
Porta David P.
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