Texas Register, Volume 36, Number 31, Pages 4863-5046, August 5, 2011 Page: 911
4863-5046 p. ; 28 cm.View a full description of this periodical.
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during an interruption, irradiation and equipment movements shall be
automatically terminated.
(x) It shall be possible to terminate irradiation and
equipment movements or go from an interruption condition to termina-
tion conditions at any time from the operator's position at the treatment
console [eentrol panel].
(xi) Timers shall meet the following requirements.
(I) A timer that has a display shall be provided
at the treatment console [eentrol panel]. The timer shall have a preset
time selector and an elapsed time indicator.
(II) (No change.)
(III) For equipment manufactured after March 1,
1989 [new equipment], after termination of irradiation and before ir-
radiation can be reinitiated, it shall be necessary to manually reset the
preset time selector.
(IV) (No change.)
(xii) Equipment capable of producing more than 1
[ene] radiation type shall meet the following additional requirements.
(I) Irradiation shall not be possible until a selec-
tion of radiation type has been made at the treatment console [control
panel].
(II) An interlock system shall be provided to:
(-a-) (No change.)
(-b-) prevent irradiation if any selected oper-
ations carried out in the treatment room do not agree with the selected
operations carried out at the treatment console [eentrol panel];
(-c-) - (-d-) (No change.)
(III) The radiation type selected shall be dis-
played at the treatment console controll panel] before and during
irradiation.
(xiii) Equipment capable of generating radiation
beams of different energies shall meet the following requirements.
(I) Irradiation shall not be possible until a selec-
tion of energy has been made at the treatment console controll panel].
(II) An interlock system shall be provided to pre-
vent irradiation if any selected operations carried out in the treatment
room do not agree with the selected operations carried out at the treat-
ment console [control panel].
(III) The nominal energy value selected shall be
displayed at the treatment console [control panel] before and during
irradiation.
(xiv) Equipment capable of both stationary beam
therapy and moving beam therapy shall meet the following require-
ments.
(I) Irradiation shall not be possible until a selec-
tion of stationary beam therapy or moving beam therapy has been made
at the treatment console controll panel].
(II) An interlock system shall be provided to pre-
vent irradiation if any selected operations carried out in the treatment
room do not agree with the selected operations carried out at the treat-
ment console [eentrol panel].
(III) The selection of stationary or moving beam
shall be displayed at the treatment console [centrolpanel]. An interlock
system shall be provided to ensure that the equipment can only operate
in the mode that has been selected.(IV) For equipment manufactured after March 1,
1989 [new equipment], an interlock system shall be provided to ter-
minate irradiation if movement of the gantry occurs during stationary
beam therapy or stops during moving beam therapy unless such stop-
page is a preplanned function.
(V) Moving beam therapy shall be controlled to
obtain the selected relationships between incremental dose monitor
units and incremental angle of movement.
(-a-) For equipment manufactured after
March 1, 1989 [new equipment], an interlock system shall be provided
to terminate irradiation if the number of dose monitor units delivered
in any 10 degrees of arc differs by more than 20% from the selected
value.
(-b-) For equipment manufactured after
March 1, 1989 [new equipment], where gantry angle terminates the
irradiation in arc therapy, the dose monitor units shall differ by less
than 5.0% from the value calculated from the absorbed dose per unit
angle relationship.
(VI) (No change.)
(xv) For equipment manufactured after March 1,
1989 [new equipment], a system shall be provided from whose read-
ings the absorbed dose rate at a reference point in the treatment volume
can be calculated. The radiation detectors specified in subparagraph
(iv) of this paragraph may form part of this system. In addition, the
dose monitor unit rate shall be displayed at the treatment console
[entrol panel]. If the equipment can deliver under any conditions an
absorbed dose rate at the normal treatment distance more than twice
the maximum value specified by the manufacturer for any machine
parameters utilized, a device shall be provided that terminates irradia-
tion when the absorbed dose rate exceeds a value twice the specified
maximum. The dose rate at which the irradiation will be terminated
shall be in a record maintained by the registrant in accordance with
subsection (1) [{ )] of this section for agency inspection.
(xvi) - (xvii) (No change.)
(B) Facility and shielding requirements.
(i) - (ii) (No change.)
(iii) The console [eontre1panel] shall be located out-
side the treatment room and all emergency buttons/switches shall be
clearly labeled as to their functions.
(iv) Windows, mirrors, closed-circuit television, or
an equivalent system shall be provided to permit continuous observa-
tion of the patient following positioning and during irradiation and shall
be so located that the operator may observe the patient from the con-
sole [control panel].
(I) - (II) (No change.)
(v) Provision shall be made for continuous two-way
aural communication between the patient and the operator at the con-
sole [entrol panel] independent of the accelerator. However, where
excessive noise levels or treatment requirements make aural commu-
nication impractical, other methods of communication shall be used.
When this is the case, a description of the alternate method shall be
submitted to and approved by the agency.
(vi) (No change.)
(vii) Interlocks shall be provided such that all en-
trance doors shall be closed before treatment can be initiated or contin-
ued. If the radiation beam is interrupted by any door opening, it shall
not be possible to restore the machine to operation without closing thePROPOSED RULES August 5, 2011
36 TexReg 4911
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Texas. Secretary of State. Texas Register, Volume 36, Number 31, Pages 4863-5046, August 5, 2011, periodical, August 5, 2011; Austin, Texas. (https://texashistory.unt.edu/ark:/67531/metapth181367/m1/94/: accessed May 21, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.