Final answer:
Percutaneous Transluminal Angioplasty and stent placement are interventional procedures used to widen stenosed vessels. The PICC line is not used for this purpose but for long-term venous access for medication.
Step-by-step explanation:
The interventional procedures that can be used to increase the diameter of a stenosed vessel include Percutaneous Transluminal Angioplasty (PTA) and stent placement. PTA involves inserting a catheter with a balloon at the tip into the affected vessel and inflating it to compress the plaque and widen the vessel. Stent placement is often done following angioplasty, where a mesh tube is inserted to keep the vessel open and prevent re-narrowing. On the other hand, a Peripherally Inserted Central Catheter (PICC line) is not used for this purpose. It is instead a long, thin tube that's inserted through a vein in the arm and passed through to the larger veins near the heart to administer medication or for long-term intravenous access.