Utilizing an x-ray tube with a large anode angle compared to a tube with a small angle and the same size actual focal spot results in:

When using an x-ray tube with a large anode angle compared to one with a small angle, there are important implications for both spatial resolution and anode heat capacity. A larger anode angle allows for better distribution of heat across the anode, which results in increased heat capacity. This means that the larger anode can handle more heat without damaging the tube, enhancing its overall longevity and performance during extensive imaging procedures.

However, a larger anode angle also impacts spatial resolution negatively. The angle affects the geometric factors of image formation; when the anode angle is larger, it spreads the focal spot's effective area, which can lead to diminished sharpness of the image. A smaller anode angle, on the other hand, concentrates the focal spot, providing better spatial resolution.

This relationship helps clarify why the option indicating decreased spatial resolution and increased anode heat capacity is the correct answer. Understanding the balance between anode angle size and its effects on image quality and thermal performance is crucial in radiography.