It is important to use a linear high-frequency transducer.
It was first introduced by Puylaert in 1986, who described the "graded compression" technique apt to better visualize the inflamed appendix [8]; by using the graded compression technique, a linear high-frequency transducer is placed on the right lower quadrant and pressure is applied gradually while imaging, displacing overlying gas-filled loops of bowel.
Another approach using real-time ultrasonic guidance with a linear high frequency transducer placed transversely over the trachea was more successful and resulted in visualisation of the needle path and satisfactory guide-wire placement in all 13 patients.[82].
A linear high frequency probe (5-12 MHz) was used with the musculoskeletal shoulder setting preset with the room darkened to enhance monitor visualization.
Using a linear transducer with the highest frequency (70 MHz) very small structures (20 µm) could be differentiated.
A focused ultrasound of the jaw and associated structures was performed using a high-frequency linear array transducer.
We performed the selective C5 and C6 blocks by injecting 0.75 % levobupivacaine (10 mL) around the C5 and C6 between the anterior and middle scalene muscles using a high-frequency linear probe of a LOGIQ e Premium system (GE Healthcare Japan, Tokyo, Japan).
The basilic veins of each subject were identified using a high-frequency linear probe (8-12 MHz, L25 probe on a Sonosite M-Turbo or S-series, Sonosite, Inc., Bothell, WA, USA).
A second scan was performed using a high-frequency linear probe in the exact same spot as Fig. 1 which showed multiple, equally spaced, horizontal, hyperechoic lines repeating down the screen without any visualization of abdominal organs (Fig. 2).
