Final answer:
In fluoroscopy, increasing the SID increases image detail and decreases OID, magnification, and patient dose; answer (a) Increase; decrease is correct.
Step-by-step explanation:
In fluoroscopy, increasing the SID (having the image intensifier closer to the patient) will increase image detail and decrease OID, magnification, and patient dose. Therefore, the correct answer is a. Increase; decrease. Increasing the Source to Image Distance (SID) means that the X-ray source is further away from the image receptor, which results in less magnification of the image, reduced patient dose, and better image detail by reducing the object-to-image receptor distance (OID). Less OID and increased SID contribute to a sharper image by decreasing the magnification of anatomical structures and minimizing the penumbra effect. Moreover, a lower OID means that fewer X-rays are scattered before reaching the image receptor, which can help lower the patient's exposure to radiation.