Olympus UM-DG20-31R Medical Endoscopic Ultrasound Probe

Olympus UM-DG20-31R Medical Endoscopic Ultrasound Probe

The Olympus UM-DG20-31R is a high-end medical endoscopic ultrasound (EUS/IDUS) probe made by Olympus.

It is a miniature radial ultrasound probe with dual-plane reconstruction (DPR) used during endoscopy to image inside ducts and organs.

In simple terms:

It’s a very thin “ultrasound camera on a wire” that can also create more advanced 3D-style images of internal structures.

What makes it special

Compared with simpler probes (like UM-2R or UM-3R), the UM-DG20-31R is designed for more advanced duct imaging:

Dual-plane reconstruction (DPR) → combines radial + linear scans to improve interpretation
3D intraductal ultrasound (IDUS) capability
Guidewire-compatible (wire-guided insertion) for precise placement in narrow ducts
High-resolution 20 MHz imaging
Can reconstruct 3D views of bile and pancreatic ducts when used with compatible systems

Key specs (typical)
Type: Radial + linear (dual-plane) mechanical ultrasound probe
Frequency: 20 MHz
Max outer diameter: ~3.1 mm
Working channel compatibility: ≥3.7 mm
Imaging: 360° cross-sectional + linear scan combination
Special feature: 3D reconstruction (DPR mode)

What doctors use it for

Mostly in advanced gastroenterology, especially:

Bile duct imaging
Pancreatic duct evaluation
Tumor depth and spread assessment in ducts
Intraductal ultrasound (IDUS) during ERCP-type procedures

Simple summary

The UM-DG20-31R is:

a premium Olympus ultrasound probe for very detailed duct imaging, combining two scanning modes to build more complete (sometimes 3D) views of internal structures.

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