The best probe is the one that matches the structures you scan most often. In practice, probe choice is determined by depth, footprint, frequency, and the type of image you need. Most clinicians get the best value when they select their first probe according to their highest-frequency use case.
Linear probes generally offer higher-frequency imaging and better resolution for superficial structures. They are well suited to vascular access, soft tissue assessment, musculoskeletal scanning, superficial collections, many nerve blocks, and selected small-parts applications.
Convex probes provide a wider field of view and better penetration for deeper abdominal and general scanning applications. They are commonly chosen for FAST-type assessments, abdominal review, obstetric use within appropriate scope, and many general bedside applications. For generalists who want one broad workhorse probe, convex often provides the most practical range.
Phased-array probes have a smaller footprint and are particularly useful for focused cardiac imaging because they help obtain views between ribs. Endocavity probes are a different category entirely — used for dedicated pelvic, obstetric, transvaginal, and selected procedural applications.
If your practice is mainly vascular access, pain procedures, soft tissue, MSK, or perioperative bedside work, linear is usually the logical starting point. If you need abdominal, trauma, and general whole-body bedside use, convex is often more versatile. If focused cardiac assessment is central to your practice, phased-array becomes important. The correct decision is scope-led, not marketing-led.
Dr Yahya Docrat is an anaesthetist based in Johannesburg, South Africa, with clinical experience in perioperative medicine and point-of-care ultrasound applications in anaesthesia, emergency medicine and critical care.