Geodesic Sensor Net - Head Measurement

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6: Applying the GSN

Geodesic Sensor Net Technical Manual

S-MAN-200-GSNR-001 • January 31, 2007

Head Measurement

Before applying the Geodesic Sensor Net to the subject’s head, you must make several

head measurements to:

• calculate the proper Net size

• determine the vertex point

Net Size

Before applying the GSN to the subject, measure the circumference of the subject’s

head to determine the appropriate Net size, using Table B-1 on page 121 and Table B-

2 on page 122 as references. (As the tables indicate, the GSN 200 and HCGSN models

have slightly different sizing.)

Take this measurement several times to ensure accuracy.

The circumference is the largest part of the head. With a measuring tape, measure

head circumference at the

glabella

(the brow ridge) and 2.5 cm. (1 in.) above the

inion

(the bump on the back of the skull); see Figure 6-1.

Adult size ranges for the GSN 200 are:

• small (53.5–55 cm.)

• medium (55.5–58 cm.)

• large (more than 58.5 cm.)

Figure 6-1. Measuring head circumference

Inion

Glabella