Hyper-transparency compensating device for a gantry mounting rad

Details Hyper-transparency compensating device for a gantry mounting rad Hyper-transparency compensating device for a gantry mounting rad

1998-10-30

2000-07-25

Porta, David P.

X-ray or gamma ray systems or devices

Beam control

Filter

378157, 378158, 378159, G21K 300

Patent

active

060944749

ABSTRACT:
The device is used for compensating a hyper transparency area due to air inside or outside an organ while using a gantry mounting radiography apparatus with digital subtraction (DSA). The device comprises compensating filters and a supporting assembly for connecting the filters in front of the X-ray source. Each filter extends in a filter plane while the organ defines a median plane in which the rotation axis of the arms of the apparatus is substantially lying. The supporting assembly is designed to keep the filter in front of the X-ray source and in registry with the X-ray source and the hyper transparency area while keeping the filter plane parallel to the reference plane during rotation of the arms. Unlike existing X-ray compensating devices which are stationary, the present invention automatically sets itself for radiography of different views in function of the rotation of the arms of the apparatus. It is well adapted for performing arteriographies and, in particular, allows the peripheral arterioles to be seen.

REFERENCES:
patent: 4053781 (1977-10-01), Hounsfield
patent: 4472828 (1984-09-01), Ferlic
patent: 4497062 (1985-01-01), Mistretta et al.
patent: 5369678 (1994-11-01), Chiu et al.
patent: 5454023 (1995-09-01), Asikainen
patent: 5483572 (1996-01-01), Hoornaert et al.
patent: 5568533 (1996-10-01), Kumazaki et al.

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