What is a significant issue that affects the quality of images obtained through digital subtraction angiography?

In the context of digital subtraction angiography (DSA), patient cooperation plays a crucial role in obtaining high-quality images. DSA relies on the clear differentiation of blood vessels from surrounding tissues by capturing a series of images before and after the injection of a contrast agent. If a patient is unable to remain still or follow instructions, such as holding their breath during image acquisition, it can lead to motion artifacts. These artifacts can obscure or distort the images, making it challenging to interpret vascular structures clearly, thereby affecting the diagnostic quality of the DSA.

Other factors, while they can also impact image quality, are generally more controllable by the technician or the equipment itself. For instance, equipment malfunction can lead to technical issues, but regular maintenance and equipment checks are typically conducted to mitigate this risk. Insufficient contrast agent can certainly reduce image clarity, but it is often monitored and adjusted based on the specific procedure requirements. Inadequate exposure time might refer to the settings used during the imaging process, which can be altered to suit the patient's need and type of imaging being conducted.