LVShim Tools And Phantom Setup

Prerequisites

Table 1. Personnel requirements
Required persons	Preliminary requirements	Procedure	Finalization
1	Not Applicable	10 minutes	Not Applicable

Table 2. Tools and test equipment
Item	Quantity	Effectivity	Part number	Manufacturer
·LVShim Phantom Assembly	1	-	2125245 (1.5T) 2360054 (3.0T)	-
·Nesting Plate Assembly	1	-	2125247	-

Table 3. Safety

Warning

POISON HAZARD!

1.5T and 1.0T PHANTOMs CONTAINS NICKEL, A SUSPECT CARCINOGEN.

DO NOT INGEST! DISPOSE OF AS A HAZARDOUS WASTE ACCORDING TO STATE AND FEDERAL REGULATIONS.

Warning

POISON HAZARD!

3.0T PHANTOMs CONTAINS Silicone Oil.

DO NOT INGEST! DISPOSE OF AS A HAZARDOUS WASTE ACCORDING TO STATE AND FEDERAL REGULATIONS.

Table 4. Required conditions
Condition	Reference	Effectivity
Incorrect data possibility. Before any LVShim is performed, the DC Offset must be performed. Failure to do so will cause errors in the LVShim results, and will increase the time it takes to shim the magnet.	-	-
Magnet should be ramped and parked.	-	-
For LCC Magnet - Pre-Cool Shim Lead before installing.	-	-
For LCC Magnet - Coldhead turned off for 10 minutes to dump flux build-up in S/C shield around Coldhead.	-	-
For LCC Magnet - Pressure Controller should be installed and working.	-	-
For LCC300 Magnets, passive shim should be performed to spec.	-	-
Shim currents entered into shim power supplies after main field has stabilized.	-	-
All RF setup and calibrations completed.	-	-
Longitudinal drive cal completed.	-	-
X, Y and Z gradients all calibrated (i.e., Gradcal procedure complete).	-	-
For TwinSpeed, ensure that all the calibration procedures above have been completed for both GradModes.	-	-

Remove the Quad Head Coil from the cradle and remove any other phantoms from the bore.
Set up and align the LVshim Phantom per Figure 1

Figure 1. ALIGNING LVSHIM PHANTOM ON PATIENT TABLE

No finalization steps.