JPH028454U

JPH028454U -

Info

Publication number: JPH028454U
Application number: JP8728088U
Authority: JP
Priority date: 1988-06-30
Filing date: 1988-06-30
Publication date: 1990-01-19

Description

[Brief explanation of drawings]

第１図ないし第５図はこの考案の実施例に係り
、第１図は照射野形状投光装置のブロツク構成図
、第２図は投光データメモリのデータフオーマツ
ト、第３図は動作説明に供するフローチヤート、
第４図はレーザビームのスキヤン動作の説明図、
第５図は体表面に投光された照射野形状の説明図
である。また、第６図ないし第１２図は従来例に
係り、第６図はＣＴシミユレータにおける断層像
撮影時の説明図、第７図はアイソセンタ位置と照
射野形状との関係の説明図、第８図はＣＴシミユ
レータにおける照射野形状投光時の説明図、第９
図は照射野形状投光装置を示す概略的な正面図、
第１０図は体表面にマーキングされた描画マーク
の説明図、第１１図は放射線治療装置を示す概略
側面図、第１２図は放射線治療時の説明図である
。２１…投光データメモリ、２２…セレクタ、２
５…投光画像メモリ、２６…レーザビーム投光器
、θ（ｊ）…投光角度、Ｓ（θ_ｊ）…照射野形状
、ＬＢ…レーザビーム。 Figures 1 to 5 relate to an embodiment of this invention, in which Figure 1 is a block diagram of the irradiation field shape projector, Figure 2 is the data format of the projection data memory, and Figure 3 is an explanation of the operation. Flow chart for
Figure 4 is an explanatory diagram of the scanning operation of the laser beam.
FIG. 5 is an explanatory diagram of the shape of the irradiation field projected onto the body surface. Furthermore, FIGS. 6 to 12 relate to conventional examples, where FIG. 6 is an explanatory diagram during tomographic imaging in a CT simulator, FIG. 7 is an explanatory diagram of the relationship between the isocenter position and the irradiation field shape, and FIG. Figure 9 is an explanatory diagram of illumination field shape projection in a CT simulator.
The figure is a schematic front view showing the irradiation field shape projection device.
FIG. 10 is an explanatory diagram of drawing marks marked on the body surface, FIG. 11 is a schematic side view showing the radiation therapy apparatus, and FIG. 12 is an explanatory diagram during radiation therapy. 21...Light projection data memory, 22...Selector, 2
5... Projection image memory, 26... Laser beam projector, θ(j)... Projection angle, S(θ _j )... Irradiation field shape, LB... Laser beam.

Claims

[Scope of utility model registration request]

A projection data memory that stores projection data including irradiation field shape data related to multiple projection angles, and searches within this projection data memory to correspond to each projection angle in descending order of projection angle or in descending order of projection angle. a selector that reads out the projected light data, a light projected image memory that temporarily stores the irradiation field shape data of the read projected light data, and a irradiation image memory that is sequentially output from the projected light image memory by scanning. An irradiation field shape projection device that includes a laser beam projector that controls on/off of a laser beam based on image data of the field shape.