12. Remove the capsule from the neck phantom and position the probe to measure lab
background. The distance bar and a red LED light can be flipped out from the rim into the
center of the collimator face to help align the thyroid position. Remember to flip the LED
back to the retracted position and move the distance bar to the bottom of the collimator
out of the field before counting. When the probe has been positioned, select <Accept>.
The system begins counting background and will count for the selected time.
WARNING: You must use the same geometry for counting the sample/capsule or lab
background as used for counting the thyroid and / patient background. The system
calculation assumes the same geometry when comparing counts to counts. You must also
ensure that the collimator is at a right angle to the neck phantom and the thyroid so that
it is positioned correctly for counting to retain the correct geometry. Make sure the
distance bar and positioning light are not in the counting field.
AVERTISSEMENT:
Vous devez utiliser la même géométrie de comptage de
l'échantillon/capsule ou lab arrière-plan tel qu'utilisé pour le comptage de la thyroïde et /
patient arrière-plan. Le calcul de système suppose la géométrie même lorsque l'on compare
le nombre de chefs d'accusation. Vous devez également vous assurer que le collimateur est à
angle droit avec le fantôme de cou et de la thyroïde afin qu'il soit positionné correctement
pour le comptage pour conserver la géométrie correcte. Assurez-vous que la barre
d'écartement et positionnement de la lumière ne sont pas dans le champ de comptage.
13. When lab background counting is finished, a “Counting Complete” message is displayed at
the bottom of the screen. Select <Next> to return to the Thyroid Uptake screen.
NOTE: If you wish to perform a spectrum analysis, select the <Analysis> icon before
selecting <Next>.
14. The Thyroid Uptake screen is now displayed. Review the results.
NOTE: If you are not satisfied with the results for dose or lab background, select the item
you wish to recount and recount the standard or lab background before saving.
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