X-ray or gamma ray systems or devices – Specific application – Absorption
Patent
1996-12-06
1998-04-14
Porta, David P.
X-ray or gamma ray systems or devices
Specific application
Absorption
378901, A61N 510
Patent
active
057402256
ABSTRACT:
A plurality of axial images covering a region of interest in a subject to be treated are scanned and voxel data of the subject are produced from the axial images. The provisional location of an isocenter and the direction of radiation are determined over the axial images. A DRR of the subject viewed from the source of radiation is developed in accordance with the provisional isocenter location, the radiating direction, and the distance between the isocenter and the radiation source. The DRR is displayed together with three cross section images which represent an isocenter plane including the isocenter and arranged vertical to a line extending between the isocenter and the radiation source, a gantry rotation plane including the isocenter, and a plane including the isocenter and arranged vertical to both the isocenter plane and the gantry rotation plane. Each of the three cross section images indicates cross-hair ROI representing the other two planes and a cross-hair ROI representing the direction of radiation. The field of radiation is then determined over the three cross section images or the DRRs. The three cross section images and the DRRs can be updated in response to shift and rotation of the cross-hair ROIs.
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patent: 5602892 (1997-02-01), Llacer
Hiroyuki Fujikawa, et al. "Acuracy of Radiotherapy Treatment Planning Using CT-Scanogram", Japanese Journal of Radiological Technology, vol. 51, No. 3, (p. 269), Mar. 1, 1995.
Bruce David Vernon
Kabushiki Kaisha Toshiba
Porta David P.
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