Ultrasound Imaging Guidelines

Fundamental Principles for Image Interpretation

The American College of Rheumatology recommends using high-frequency transducers (≥10 MHz) for superficial structures, including tendons, ligaments, small joints, and synovial tissues, to achieve optimal resolution 2
The European League Against Rheumatism (EULAR) suggests that lower frequency transducers (3.5-5 MHz) are appropriate for deeper structures like the shoulder or hip, recognizing the trade-off between resolution and penetration depth 1
The American Institute of Ultrasound in Medicine recommends testing equipment's capability before clinical use by visualizing fine structures such as small extensor tendon insertions or tiny amounts of fluid in the pre-Achilles bursa 2
The World Federation for Ultrasound in Medicine and Biology suggests selecting transducers with appropriate footprint size; large footprints cannot adequately visualize small joints like metacarpophalangeal joints due to limited maneuverability 2

The American College of Radiology recommends following consistent transducer orientation to ensure reproducibility, with longitudinal scans showing proximal/cranial/upper structures on the left side of the screen and distal/caudal/lower structures on the right side 1
The European Society of Radiology suggests that transverse scans should show medial/ulnar/tibial structures on the left side and lateral/radial/fibular structures on the right side 2

The American College of Emergency Physicians recommends using ultrasound in acute settings for resuscitative, diagnostic, symptom-based, procedure guidance, and therapeutic/monitoring purposes 4
The European Society of Intensive Care Medicine strongly recommends anatomical evaluation under ultrasound guidance for arterial cannulation when pulse is not palpable or after multiple failed attempts 8
The American Institute of Ultrasound in Medicine suggests that continuous visualization of the needle tip during trajectory using both in-plane and out-of-plane techniques can help avoid posterior wall penetration 8

The European League Against Rheumatism (EULAR) recommends that operators possess detailed anatomical knowledge of all structures being examined and understanding of basic ultrasound physics and sound wave principles 5
The American College of Radiology suggests seeking proper training under the guidance of experienced investigators rather than attempting self-directed learning 2
The World Federation for Ultrasound in Medicine and Biology recommends utilizing national and international society training guidelines (e.g., EULAR for musculoskeletal ultrasound) and engaging in continuous training and education due to the operator-dependent nature of ultrasound 2

The American College of Rheumatology recommends never applying excessive transducer pressure as this eliminates synovial hypertrophy, compresses vessels, or removes Doppler signal 2
The European Society of Radiology suggests recognizing that operator inexperience leads to incorrect image acquisition and interpretation, potentially causing patient harm through misdiagnosis 2
The American Institute of Ultrasound in Medicine recommends avoiding "seeing what you expect to see" from clinical examination alone and considering obtaining a second opinion from an experienced sonographer for scientific analysis 1

The American College of Radiology recommends documenting every examination carefully using standardized format to ensure reproducibility, including two perpendicular planes for all pathological findings 3
The European League Against Rheumatism (EULAR) suggests that for research or quality assurance purposes, ultrasound modalities and settings used, brand and model of ultrasound device and transducer type, and whether acquisition and reading were performed simultaneously or separately should be reported 9