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5.03: Zone F1 – Middle Forehead

YOUR ASSIGNMENT FOR THIS LESSON

✅ Step #1: Review all content below.

✅ Step #2: Image the F1 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 F1

STANDARD F1 ORIENTATION:
TRANSVERSE

Locate this zone by having patient raise brows, note movement of frontalis muscle. The middle most point of movement of this muscle is F1.

QUICK TIP
  • Immediately reduce the depth of your penetration. The tissue here is not thick, and you only need a 1-2 cm depth of penetration in this location. Don't waste the resolution or your screen space, as nothing will be shown below the skull! Recall the physics of ultrasound waves that bounce off bone.

EXAMPLE OF IMAGE ACQUIRED AT F1

Srandard image acquired at F1. See key below for lables.*

ANATOMICAL LEGEND FOR F1 LOCATION

*Standard image acquired at F1 labeled with key anatomical structures.

KEY VESSELS IMAGED AT F1

Key vascular anatomy at F1 is the paracentral and supratrochlear a.

DOPPLER IMAGE ACQUIRED AT F1 OF KEY VESSELS

Play Video
QUICK TIP
  • The vessels here are usually small. This means there are easily occluded and only seen at high frequencies. To optimize your chances of identifying these vessels you should:
    • Use lots of gel and minimize pressure with the probe.
    • Use as shallow a depth of penetration as possible to optimize the frequency at which you are scanning.
  • It can be very hard and sometimes simply impossible to image vessels at F1. So if you are trying your best and not identifying them, try to image another model. They are usually easier to identify in male patients, so when starting out, male foreheads can be helpful models.

DO IT YOURSELF CHECKLIST

Structures to Identify on Ultrasound for F1

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