What controls the current of a CT scanner's x-ray tube?

The correct answer is mA (milliamperes), which directly controls the current of a CT scanner's x-ray tube. In this context, mA refers to the measure of electric current that flows through the x-ray tube during the imaging process. It is a crucial factor because it determines the quantity of x-rays produced; higher mA results in more x-rays being generated, which contributes to the overall quality of the image.

When the mA is increased, the number of electrons flowing from the cathode to the anode in the x-ray tube increases, leading to a higher output of x-ray photons. This is essential for achieving adequate image contrast and brightness. Therefore, adjusting the mA settings allows technologists to optimize the radiation dose and image quality based on the specific diagnostic requirements.

In contrast, kVp (kilovolt peak) controls the voltage applied across the x-ray tube, with a primary influence on the energy and penetrating power of the x-ray beam rather than the current itself. Exposure time dictates how long the x-ray beam is active, influencing the total radiation dose but not the current. The field of view pertains to the area being scanned and does not directly control the current in the x-ray tube. Thus, m