Center Phantom

Prerequisites

Table 2. Tools and test equipment
Item	Quantity	Effectivity	Part number	Manufacturer
Phantom Holder	1	-	2331933	-
Quality Assurance Phantom	1	-	5128754/5149628 5128754-3/5149628-3	-
Bubble Level	1	-	-	-

Table 3. Safety

No personnel or patients should be in the area of the gantry while scanning without adequate radiation safety precautions being utilized.

Table 4. Required conditions
Condition	Reference	Effectivity
Recommend procedure completion by GE Service trained personnel.	-	-
Gantry covers and scan window installed.	-	-

Overview

This document provides the necessary steps to center the Quality Assurance Phantom in the scan plane.

Move table to longitudinal home position.
Attach phantom holder to gantry end of cradle.
Mount phantom to phantom holder.
Place bubble level on top of phantom, positioned along Z-axis. Adjust phantom holder back knob until phantom is level front to back.

Figure 1. Phantom Back Adjustment Knob
Turn on laser alignment lights.
Move table into gantry until axial internal alignment lights are aligned with phantom's axial reference mark.
Adjust phantom holder side knob until sagittal internal alignment lights are aligned with phantom’s sagittal reference mark.
Elevate table until coronal internal alignment lights are aligned with phantom’s coronal reference mark.
Click SCANNER UTILITIES.
Click CENTER PHANTOM.
Click CONFIRM.
Press START on SCIM/GSCB when it flashes.
Adjust phantom position if results are out of specification range.

note: Phantom center specification is ± 0.5mm.
Repeat steps 11 – 13 until the phantom is centered.
Click DONE in Phantom Centering window.
Click QUIT in Scanner Utilities window.

No finalization steps.