Ultrasound probes
3 probes are commonly used for point of care ultrasound:
- Linear High Frequency Probe.
- Curvilinear Low Frequency Probe.
- Phased Array Cardiac Probe.
Linear Probe:
- High Frequency
- Linear footprint
- Shallow Depths
- Good Image Resolution
- Superficial, Musculoskeletal
Curvilinear Probe:
- Low Frequency
- Large Curved footprint
- Greater Depths 20-25cm
- Less Image Resolution
- Abdominal / Deep Structures
Phased Array Probe:
- Low Frequency
- Small Square footprint
- Good Depth Penetration
- Triangular Sector Beam
- Fits between rib spaces
- Ideal for Cardiac
More about ultrasound probes
Each probe consists of the following parts:
- Probe Head: Contains the piezoelectric crystals that emit and receive reflected ultrasound waves. Piezoelectric crystals have the property of being able to convert electrical energy to vibration to produce sound waves and vice versa.
- Orientation Marker: All probes have an orientation marker that allows us to orientate probe positioning with the image on the screen. This is typically a notch on the probe or LED light.
- Probe Body: This houses various components to complete the probe. The body serves as a useful place to hold and manipulate the probe.
- Connection to Machine/Display: This may take the form of a cable or via Bluetooth or Wi-Fi for wireless transducers.
Image shows a curvilinear probe and orientation marker notch.
YouTube Video: Principles of ultrasound, instrumentation and orientation.
probe handling and manipulations
- The probe is generally held like a pen, with the body held between the index fingers and thumb.
- The tail end of the probe is supported by the hand.
- This position is comfortable and ergonomic.
YouTube Video: How to Manipulate and Handle the Ultrasound Probe.