What are your policies/practices for physician role of SBRT/SABR treatment delivery?

How do physicians and physicists in your practice handle SBRT image verification and treatment delivery?

• Physician and Physicist at the machine for images and entire treatment
• Physician at the machine for images. Physicist at the machine for images and entire treatment
• Physician check images prior to treatment (not at the machine), Physicist present for images and treatment delivery.
• Other