Signal To Noise Check-Surface Coils

Prerequisites

Table 2. Tools and test equipment
Item	Quantity	Effectivity	Part number	Manufacturer
Universal Phantom Holder	1	-	46-328383P1	-
100mm Sphere Phantom (filled with NiCl2 solution)	1	-	46-317586G1	-
TLT Head Sphere Phantom (filled with NiCl2 solution)	1	-	46-265826G6 (for Flex Coil)	-
· Head Loader	-	-	46-287899G1 (for Flex Coil)	-

Table 3. Safety

warning

POISON HAZARD!
THE PHANTOM CONTAINS NICKEL CHLORIDE, A SUSPECTED CARCINOGEN
DO NOT INGEST. DISPOSE OF AS A HAZARDOUS WASTE ACCORDING TO STATE AND FEDERAL REGULATIONS.

Table 4. Required conditions
Condition	Reference	Effectivity
No image artifacts	-	-
System Gain Calibration complete	-	-

note:

The Body SNR Sphere Phantom, 46-265635G4, is not provided with the System. If the Body SNR sphere is needed, the customer must order it. A Body Loader is provided with the system.

Procedure

At the operator workspace, select the scan icon in the desktop control panel.
If necessary, exit out of any previous exams by selecting End Exam.
Click on New Pt and enter the following:
1. Id: geservice
2. Name: snr check
3. Weight (lb.): 111
  
  note:
  Possible equipment damage. Completely remove the Quad Head Coil from the cradle before performing any body scans. Failure to do so may damage the Head Coil T/R Network.
Remove the Quad Head Coil (if present) from the cradle.
Place the surface coil to be tested on the table.
Connect the coil connector to its mating connector in the Carriage Assembly.
For Coils using the Universal Phantom:
1. Position the Universal Phantom Holder on the coil. Refer to Figure 1 for specific details for each coil type.
  
  note:
  The General Purpose (GP) Flex Coil uses the Head Coil TLT phantom and loader for its phantom (not the Universal Phantom). Refer to Step 8 for General Purpose (GP) Flex Coil setup details.
  
  Figure 1. UNIVERSAL PHANTOM HOLDER SETUP
2. Place the 100-mm phantom in the phantom receptacle, LANDMARK, and MOVE TO SCAN. See Figure 2.
  
  Figure 2. LANDMARKING UNIVERSAL PHANTOM
GP Flex Coil Setup: Set up Flex Coil per Figure 3. LANDMARK, and MOVE TO SCAN.

Figure 3. GP FLEX COIL PHANTOM SETUP
At the operator workspace, prepare the system for an SNR Check (Surface Coils) scan using the scan protocol (o.13.7) shown in the "Service Protocols" procedure located on the service methods CD-ROM.
Click on Autoview, just below the Autoview image display screen, to automatically display your images.
Click on Save Series, then Prepare to Scan.
Click on Auto Prescan to properly calibrate the RF power level for the 90-degree and 180-degree pulses.
Click on Scan. Record the Exam number and Series number for SNR Calculations. After the first scan is complete, click on Scan again (two back-to-back scans).
For analysis, see Section Image Analysis.
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Finalization

No finalization steps.