§ 228.73. Selection of stationary beam therapy or moving beam therapy.
Equipment capable of stationary beam therapy or moving beam therapy, or both, must meet all of the following additional requirements:
(1) Irradiation may not be possible until a selection of stationary beam therapy or moving beam therapy has been made at the control panel.
(2) An interlock system shall be provided to insure that the equipment can operate only in the mode which has been selected.
(3) An interlock system shall be provided to prevent irradiation if any selected operations carried out in the treatment rooms do not agree with the selected operations carried out at the control panel.
(4) The mode of operation shall be displayed at the control panel.
(5) An interlock system shall be provided to terminate irradiation if one of the following occurs:
(i) Movement of the gantry during stationary beam therapy.
(ii) Movement of the gantry stops during moving beam therapy unless the stoppage is a preplanned function.
(6) An interlock system shall be provided to terminate irradiation if the number of dose monitor units delivered along an arc differs by more than 10% from the selected value. Termination of irradiation shall be as required by § 228.70 (relating to interruption and termination switches).
Source The provisions of this § 228.73 adopted October 2, 1998, effective October 3, 1998, 28 Pa.B. 4894; amended October 26, 2018, effective January 24, 2019, 48 Pa.B. 6791. Immediately preceding text appears at serial pages (304593) to (304594).
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