Portal imaging device

Details Portal imaging device Portal imaging device

1990-08-03

1992-08-11

Howell, Janice A.

X-ray or gamma ray systems or devices

Nonphotographic detector support

378190, 378193, 378 62, H01J 3149

Patent

active

051386470

ABSTRACT:
A radiation treatment apparatus is provided which has an extendable imaging device. The radiation treatment apparatus comprises a stand which supports a gantry in a rotable manner. The gantry has a treatment head for emitting a radiation beam towards an object. The extendable imaging device is coupled to the gantry opposite to the treatment head in the trajectory of the radiation beam at a point past the object. The imaging device includes an holding means which is extendable from the gantry one end of which is arranged at the gantry and at the other end of which a detector head is coupled. The detector head comprises an image converting means which in its operating position is essentially perpendicular to the radiation beam and which converts an image represented by the radiation beam into a visible image. It also comprises a reflector coupled with the image converting means for reflecting the visible image into a light channel formed by the holding means and to a video camera. In a preferred embodiment of the invention the image converting means is collapsible and the reflector is formed as a mirror and is foldable towards the image converting means.

REFERENCES:
patent: 2505853 (1940-06-01), Jany
patent: 4890313 (1989-12-01), Lam et al.
patent: 4995068 (1991-02-01), Chou et al.
"A Primer on Theory and Operation of Linear Accelerators in Radiation Therapy", U.S. Dept. of Commerce, National Technical Information Service, Dec. 1981.
"Use of Digital Fluoroscopy as an On-Line Verification Device in Radiation Therapy", J. Leong in Phys. Med. Biol., 1986, vol. 31, No. 9, pp. 985-992.
"Therapy Imaging: A signal-to-noise analysis of metal plate/film detectors", Munro et al. in Med. Phys. 14 (6), Nov./Dec. 1987, pp. 975-984.
"Fluoroscopic Visualization of Megavoltage Therapeutic X Ray Beams", Baily et al. in Int. J. Radiation Oncology Biol. Phys., vol. 6, 1980, pp. 935-939.
"Video Techniques for On-line Portal Imaging" by Shalev et al., in Computerized Medical Imaging and Graphics, vol. 13, No. 3, 1989, pp. 217-226.
International Search Report PCT/US 91/05523.

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