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LVShim Procedures
Doing the System Performance Test (SPT)
The system performance test (SPT) automatically executes Eddy Current Check, SNR, Stability, and Coherent Noise tests. To do SPT in PM mode, you must launch SPT from the PM Assist menu.

Adjustments/Calibrations
- System
  - B0 Drift Calibration
  - Doing DQA calibration
    The DQA tool determines proper gradient polarity and proper gradient wiring by scanning a series of axial and coronal images of the DQA III phantom.
  - Troubleshooting the Daily Quality Assurance (DQA) II tool
    If problems are encountered while using the Daily Quality Assurance (DQA) calibration procedure, refer to the following guidelines for troubleshooting.
  - Dual drive quadrature tool
  - Doing the Echo Planar Test
  - Deionization procedure
  - HIS/RIS Setup and Troubleshooting
  - Calibrating High Order Shim (HOS)
    This procedure creates High Order Shim (HOS) reference maps characterizing the fields created by the HOS windings. These maps are used by the HOS feature.
  - ICN On/Off procedure for Sun 4100, 4170, and Dell R620
  - LVShim Procedures
    - Doing the System Performance Test (SPT)
      The system performance test (SPT) automatically executes Eddy Current Check, SNR, Stability, and Coherent Noise tests. To do SPT in PM mode, you must launch SPT from the PM Assist menu.
  - Running LVShim
    The objective of the LVShim tool is to fine-tune magnet homogeneity.
  - Running LVShim - Gradshim
  - Running LVShim in Auto mode
  - Running LVShim in Manual mode
  - System gain calibration
    Head and body system gain calibration.
- Gradient
- Radio Frequency (RF)
- Magnet Enclosure
- Patient Table
- Global Operator Console (GOC)
- Spectroscopy

Discovery MR750 3.0T System Service Methods
5690009-2EN Revision 4
Object ID: 00000018WIA306E0110GYZ
Topic ID: id_2003328 Version: 11.8
Date: Dec 9, 2021 7:18:58 PM

Doing the System Performance Test (SPT)

Prerequisites


Personnel requirements
Required persons	Preliminary requirements	Procedure	Finalization
1	-	90 minutes	-


Tools and test equipment
Item	Quantity	Part number	Manufacturer
Head Loader Positioner	1	5110241	-
Head TLT Loader for 3.0T	1	2360031	-
Head TLT Sphere for 3.0T (Pink Solution)	1	2359877	-
Body TLT Sphere for 3.0T (Pink Solution)	1	2360025	-
Body TLT Loader for 3.0T	1	2360037	-
Service Key	1	-	-


Required conditions
Cancel all previous exams. Click End Exam.
Remove any patient positioning devices, such as patient restraints or other attached devices.


Safety
Before working in any GE Healthcare MR suite or performing any GE Healthcare service procedure, you must: Have read and understood all hazard conditions and safety requirements in the latest revision of the GE Healthcare MR Service Safety Manual (5452735). Have successfully completed all relevant GE Healthcare Environmental Health and Safety (EHS) courses (or for non-GE employees, equivalent workplace training courses). Comply with all site-specific training and workplace safety requirements. If you have any safety concerns at any time, do not begin work or immediately stop work and move to a safe location. Immediately contact your supervisor or site safety officer for instructions on how to proceed.

About this task

The next PM date reporting and PM due/overdue notices were removed from SW versions 27 and later. Please reference the CRM for this customer/system ID to ascertain the next PM due date.