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8.03: Zone N1 – Radix

YOUR ASSIGNMENT FOR THIS LESSON

✅ Step #1: Review all content below.

✅ Step #2: Image the N1 zone on your own with your ultrasond, and using the checklist provided on this page, check off all key structures to be identified in this location

TRANSDUCER POSITION AT N1

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STANDARD N1 ORIENTATION:
TRANSVERSE & LONGITUDINAL

The radix, the most posterior nasal point at which the nose begins is the location of N1.

QUICK TIP
  • You need A LOT of gel in this location due to the contour of the nose not allowing for the full probe to be flush with the skin. Fill any areas that cannot be in contact with the probe with gel to optimize your images.

EXAMPLE OF TRANSVERSE IMAGE ACQUIRED AT N1

Standard image acquired at N1. (Transverse| Left side is patient's right). See key below for lables.*

ANATOMICAL LEGEND FOR N1 LOCATION IN TRANSVERSE

*Standard image acquired at N1 labeled with key anatomical structures.

EXAMPLE OF LONGITUDINAL IMAGE ACQUIRED AT N1

Standard image acquired at N1. (Longitudinal | Left side is deep). See key below for lables.*

ANATOMICAL LEGEND FOR N1 LOCATION IN LONGITUDINAL

*Standard image acquired at N1 labeled with key anatomical structures.

DOPPLER IMAGES ACQUIRED AT N1 OF KEY VESSELS

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QUICK TIP
  • N1's vessels are often small with slower flow. Power doppler can be useful here, also if using color doppler turn your sensitivity to 2cm/s to detect the slower flow. Just be mindful of motion artifacts.
  • You need to keep pressure off the nose; otherwise, you will easily occlude these vessels. Again, use lots of gel and a very light touch. Pressure should be applied to the gel, not directly to the skin.
  • The dorsal nasal arteries are often off the midline, gliding a few mm lateral from the midline to detect these vessels. Be aware that if you move too lateral you will encounter the angular artery.

DO IT YOURSELF CHECKLIST

Structures to Identify on Ultrasound for N1

Once you have completed this checklist, mark this part of the lesson as complete.