Final Answer:
A tube cannot be towed when it has a patient connected to life support or monitoring equipment.
Step-by-step explanation:
In the context of medical imaging, particularly in computed tomography (CT) scans, it is crucial to consider the safety and well-being of the patient. Tubes, such as those connected to life support or monitoring devices, are integral to a patient's care during a medical procedure. Towing a tube with a patient connected to life support or monitoring equipment could pose serious risks to the patient's health and compromise the effectiveness of medical care.
Therefore, it is a standard practice and a safety protocol to avoid towing a tube when it is actively supporting or monitoring a patient during a CT procedure.