A high-quality accelerator control system is essential for the successful gating of a radiation beam into the breath-hold. The Varian Linac approach makes use of the "Customer Minor (CMNR) interlock" of the Varian C-Series accelerators (Varian Medical Systems, Palo Alto, Ca). The patient triggers the CMNR interlock in this system by pressing a button on a hand-held switch. The switch enables the therapist to operate the beam by disabling the console's CMNR interlock. When the switch is depressed, it activates, preventing further delivery until the switch is depressed again, and it remains activated until the switch is depressed again. The decision to initiate therapy is made together by the therapist and patient. Because the beam delivery system and other safety components already have interlock circuitry, no modifications to the accelerator are required. A comprehensive set of instructions is available in the section under "Treatment."
https://www.oncologyradiotherapy.com/articles/study-of-lung-...

См. также: https://www.google.ru/search?q="Customer Minor (CMNR) interl...

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Note added at 1 hr (2023-10-15 22:29:59 GMT)
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P.S. В данном контексте я бы перевел как блокировка пациентом.

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Note added at 1 hr (2023-10-15 22:59:31 GMT)
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Еще одно описание того, о чем вроде бы идет речь:

In another method which is voluntary breathe-holding without respiratory monitoring, patient holds his/her breathe in a portion of respiratory period, voluntarily. For the time of breath-holding, the beam of radiation is on and patient is under exposure. For implementation of this technique, a control system is developed for the Varian C series[21,22] accelerators that use customer minor (CMNR) interlock. The patient holds a switch in his/her hand, which is connected to a circuit of CMNR. When this switch is pressed by the patient, the CMNR interlock gets opened in the control console and permits the operator to turn on the Linac. When the button is pushed off, the CMNR interlock becomes energetic and turns off the beam. In this method, activation of CMNR interlock prevents from dose delivering to patient until the switch is pressed again. It should also be noted that although in this system both the operator and patient can turn the beam off, just the operator can turn the beam on. Another thing that should be considered is that this system is not available commercially. There is also some other systems such as infrared reflector systems, breathing stick, cine electronic imaging, leveling marks, magnets, and stretching belts, which have been used for the implementation of DIBH technique.[19,23,24,25,26]
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6293641/