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Патент USA US3090878

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May 21, 1963
Filed July 6, 1959
2 Sheets-Sheet 1
Rolf \A/fderde
Hermann Egger
May 21, 1963
Filed July 6, 1959
2 Sheets-Sheet 2'
Raff Wderde
Hermann Egger
BY/imu {KM/6M A, ADAM
" inc
Fatented May 21, 1963
Rolf Wideriie, Nussbaurnen, near Baden, and Hermann
Egger, Ennetbadcn, Switzerland, assignors to Alrtien
geselischaft Brown, Boyer-i & Cie, Baden, Switzeriand,
a joint-stock company
Filed July 6, 1959, Ser. No. 825,015
Claims priority, application Switzerland July 4, 1958
2 Claims. (Cl. 256-91)
rangement of such end switches and their manner of op
eration can be found in United States Patent No. 1,425,
890 issued August 15, 1922, to W. L. Merrill.
In addition to the oscillating movement, the ray genera
tor can also be adjusted in the vertical direction by means
of a servomotor 11 and a vertical guide system. For this
purpose the vertical support 8 is ?xed to transverse beam
12 which is provided with threaded holes and is supported
by the screw spindles 13. When these spindles are rotated,
10 the transverse beam 12 and thus also the ray generator
are raised or lowered. These spindles are rotated by way
The invention concerns a device for a radiation plant
of the gears 14 and motor 11.
comprising a ray generator and a treatment bed for ir
radiating parts of the body of a patient with various angles
In accordance with the invention, ray generator 1 is
provided with an arm 15 arranged in the beam direction
of incidence for the beam. The source of the rays is
rotated by a motor drive about a horizontal axis pass 15 as indicated by the arrow 2 and having a pivoted joint
16 at its lower end, the joint 16 having a horizontal axis
ing through the ray generator and can be adjusted in the
parallel to the pivot shaft 7 of the ray generator 1. This
joint 16 is connected by way of the frame 17 with the
chassis 3 and is thus also rigidly connected with the
perpendicular to the axis of rotation of the ray producer.
With such a radiation plant it is essential that it is 20 treatment bed 4. Each movement of the joint 16 in the
horizontal direction corresponds to a similar horizontal
possible to irradiate the body part in question in various
vertical direction by a servomotor. The bed is arranged
on a chassis which can be moved on a horizontal track
ways. It may for instance be necessary to irradiate a cer
movement of the treatment bed.
By means of a guide
device any tendency for the chassis to tilt due to the
lateral force exerted by the arm is prevented. The dis
treatment point should remain constant. The beam axis 25 tance between the beam axis and the rotational body axis
determined by the pivoted joint 16 is thus kept constant.
in this case intersects an imaginary axis in the body, the
When this distance is made equal to zero, during the ir
rotational body axis, about which the beam source ap
radiation process a part of the body lying in the body
parently rotates. It can, however, also be desired that
axis will be irradiated with every beam direction.
the position of the irradiated part of the body should vary
For this movement the speed of motor 11 must be main
with the angle of the beam. In this case the beam axis is 30
tained at a value which enables the treatment bed to be
parallel to the axis of rotation of the body.
tain part of the body from a constantly changing direction
whereby the distance between the ray generator and the
According to the invention, this problem is solved by
moved as required without di?iculty. The pivoted joint
16 should not be subjected to a force component which
providing the ray generator with an arm which is con
causes the chassis to be raised or lowered. For this pur—
nected to the treatment bed by means of a pivoted joint,
the treatment bed being ?exibly supported so as to move 35 pose the treatment bed is supported in a vertically ?exible
manner with respect to the track. The wheels 6 are spring
in the vertical direction with respect of the track, and a
measuring arrangement being provided which determines
a vertical movement of the treatment bed relative to the
supported by means of the springs 24 which due to their
resilience compensate any strong vertical forces which
track and produces corresponding control signals, where
by these signals are passed by way of an ampli?er to the
produce control signals by means of which the speed of
motor 11 is regulated.
A measuring arrangement is provided on the chassis for
the control system whereby a vertical displacement of
servomotor for the vertical movement of the ray source,
so that the operation of the servomotor is controlled in
such a manner that the vertical movement of the treat
ment bed remains as small as possible.
At the same time this resilience is utilized to
the treatment bed or the chassis relative to the track is
The invention is explained by means of a constructional 45 determined and corresponding control signals are pro
duced. These control signals are ampli?ed in an ampli?er
example. FIG. 1 shows an irradiation plant where the
19 and supplied to the servomotor 11 for controlling the
beam from the ray generator is directed vertically ‘down
vertical movement of the ray generator. The control sys
wards. FIG. 2 shows the same apparatus where the
tem operates in such a manner that the speed of the servo
beam is inclined to the point that has to be irradiated.
In FIG. 1 reference numeral 1 indicates the ray genera 50 motor is so regulated that the vertical movement of the
treatment bed is reduced and kept as small as possible.
tor. The ray generator 1 may be one such as taught in
A roller 20 serves as the measuring element for deter
the prior art for radiation thereapy such, for example,
as disclosed in United States Patent No. 2,822,478 granted '
mining the undesirable vertical movement, this roller being
mounted on a vertically arranged rack 21 on the chassis.
February 4, 1958 to Rolf Wideroe. The arrow 2 shows
the direction of the beam as it leaves the generator. The 55 This track is in engagement with a gearwheel 22 which
carries the moveable part such as the contact arm 23a of
chassis 3 is equipped with wheels 6 which can roll along
a regulating device, for instance a regulating resistor 23.
a horizontal track 5. The treatment table 4 is mounted
Depending upon whether the arm 15 acts on the chassis
on the chassis, so that both the chassis and the treatment
in the upward or downward direction, the contact arm 23a
bed execute the same horizontal movements.
The ray generator is ?xed to the vertical support 8 in 60 of the resistor 23 will be displaced up or down on resis—
tor 23 ‘as a result of rotation of gear 22 with a correspond
a rotatable manner by means of a pivot 7. The tilting
ing transmission ratio so that control signals derived from
movement is produced by means of a reversible drive in
the position of contact arm 23a pass to the ampli?er in
cluding a worm wheel 9 secured upon pivot shaft 7 which
put, and the ampli?er output is fed to the motor 11 which
is meshed with a worm 9a actuated by motor 19. This
motor is of the non-synchronous type and causes the ray 65 is in?uenced correspondingly in the forward or reverse
direction with the result that the heighth of the pivoted
generator to execute an oscillating movement at a constant
joint above the track and thus also that of the treatment
angular speed. Switches 39, 31 shown in FIG. 2., are pro
vided at the end positions of the ray generator by means
point above the track is maintained practically constant.
of which the driving motor 10 is rapidly reversed. These
In order to ensure that for each tilted position of the
end switches 30, 31 and their connections are shown only 70 ray generator the beam axis is directed towards a de?nite
schematically and operate in a conventional manner to
point, it is necessary that the beam axis should intersect
effect periodic reversal of the motor 10. A typical ar
the extended axis at the pivoted joint 16.
In certain cases it may be desirable that the beam axis
erator accompanied by vertical up and down movement of
should be allowed to pass alongside the joint axis. It may
also be expedient to make the arm 15 adjustable as regards
its length so that the distance between joint 16 and the
said support therefor causes said chassis to be moved
axis of rotation 7 can be varied as desired.
We claim:
back and forth along said trackway, means resiliently
mounting said chassis and bed for resilient movement in a
vertical plane, means producing a variable control signal
determined by the departure in height of said bed from
1. Apparatus for radiation therapy comprising a sup
a desired central position, and an ampli?er to which said
port, a ray generator producing a beam of rays and mount
control signal is connected as input, the output from said
ed on said support for pivotal movement about a horizon
ampli?er being connected to said second reversible servo
tal axis, a motor e?ecting oscillation of said ray generator 10 motor for varying the operating speed and direction there
about its pivotal axis, means mounting said support for
raising and lowering movement in a plane perpendicular to
the pivotal axis of said ray generator, a reversible servo
motor for raising and lowering said support and said ray
generator, a chassis under said ray generator movable
along a trackway transverse to the pivotal axis of said ray
generator, said chassis including a treatment bed for
patients to be treated by said ray generator and towards
which the radiation from said ray generator is directed,
an arm depending from said ray generator in a direc 20
tion parallel to the axis of the beam of rays emanating
from said ray generator, the lower end of said arm being
articulated to said chassis by a pivotal joint with a hori
zontal axis parallel to the pivotal axis of said ray genera
tor whereby pivotal oscillatory movement of said ray gen 25
of for raising and lowering said support in accordance with
said control signal to maintain said bed at said desired
centralposition when said ray generator is oscillated about
its pivotal axis by said ?rst motor.
2. Apparatus for radiation therapy as de?ned in claim
1 where the axis of the radiation beam from said ray gen
erator intersects an extension of the axis of articulation
at the lower end of said arm.
References Qited in the ?le of this patent
Green et a1 ___________ __ Feb. 12, 1957
Peterson _____________ __ May 21, 1957
Widerée _____________ __ Feb. 4, 1958
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