• SIGNA™ Hero 3.0T Service Methods
  • 5852800-8EN Revision 1.0
  • Object ID: 00000018WIA30A10F20GYZ
  • Topic ID: id_13106298 Version: 2.2
  • Date: Jul 13, 2021 3:56:30 PM

SPT Body Check

Prerequisites

Table 1. Personnel requirements
Required personsPreliminary requirementsProcedureFinalization
1Not Applicable1 hoursNot Applicable
Table 2. Tools and test equipment
ItemQuantityEffectivityPart numberManufacturer
Form Support for ECMT and Phantom1-

5554839

-
Head TLT Phantom Positioner for TDI HNU1-

5554484

-
Head TLT Sphere for 3.0T (Pink Solution)1-

2359877

-
TDI Head Neck Unit1-

See FRU Manual

-
Body TLT Sphere for 3.0T (Pink Solution)1-

2360025

-
Body TLT Loader for 3.0T1-

2360037

-
Table 3. Required conditions
ConditionReferenceEffectivity

Cancel all previous exams. Click End Exam.

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Remove any patient positioning devices, such as patient restraints or other attached devices.

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Insert an FE or Advanced Service Key into USB port on host computer.

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About this task

System Performance Test (SPT) runs phantom position checks before starting any user-selected SPT except the Coherent Noise Test. It takes approximately two minutes for the head phantom position check and two minutes for the body phantom position check. The test will not start unless the phantom position checks are successful.

Important: After SPT begins, you can stop it at any time by clicking Abort SPT or Quit SPT. If you abort the test, all valid test results are assembled into a results file. See Troubleshooting SPT Problems for additional information about clearing conditions that can occur after an untimely abort.

Topic ID: id_SL3887770-1178786

Positioning Short Body Loader with Body Sphere

About this task

Follow this process to properly position the body sphere and loader.

Procedure

  1. Properly position the head sphere in HNU with positioner.
  2. Landmark on the center line of the HNU, but do not advance to scan.
  3. Run the cradle in so the display reads I 1135 mm.
    Figure 1. Distance between HNU Landmark and Center Mark on Body Loader
  4. Turn on the alignment light and then position the body loader on the phantom foam support so that the alignment light is properly centered on the loader crosshair. Ensure that the body loader is stable during scanning.
  5. Press Advance to Scan.
Topic ID: id_SL1713717-1178786

Invoking SPT Full Test Mode

Procedure

  1. To start the SPT Full Test tool from the Service Browser, select the Image Quality tab and follow the steps shown in the illustration below.
    Figure 2. Starting SPT Test Tool
  2. An SPT Test menu window displays on the desktop. Always use the Full Test Mode.
    1. To select all SPT tests, click Yes next to all tests fields. To select individual tests, click No next to all test fields, then click Yes next to each test you want to run. Leave coil type to [Body Tx] as default value.
    2. To select a reason for the test, choose an option from the Test Purpose list. If desired, enter text in the Comments field.
    3. To select multiple passes of the test(s), click Multi Passes and then enter a number in the field.
    4. Click Start SPT to begin.

      As the tests run, status messages display in the text box below the menu. Use the scroll bar on the right to move up or down through the messages.

      SPT runs phantom position checks before starting any user-selected SPT, except the Coherent Noise Test. It takes approximately two minutes for the head phantom position check and two minutes for the body phantom position check. The test will not start unless the phantom position checks are successful. When SPT is complete, it displays a pop-up indicating the status of the completed tests, such as "All tests completed successfully" or “Severe Failure was detected." See Viewing Results - Report Manager Tool.

    5. To see failure details, click WhatFailed. An example of WhatFailed output is in Troubleshooting SPT Problems.
    Note:

    This screen displays until you quit SPT. If you are in troubleshooting mode, click the Start SPT button to run the test again.

    Figure 3. Test Selection - Full Test Example

    As each test is running, a message displays in the window indicating which data is being collected or processed. Start time and estimated completion times also display. Although the estimated time may expire, the test is not complete until you see a successful or failure message.

  3. To exit SPT, click Quit SPT.
  4. To view SPT results, select the Utilities tab on the Service Browser, then click Report Manager.
  5. Enter the report manager password (mrgo1) and press Enter .
Topic ID: id_SL1724787-1178786

Troubleshooting SPT Problems

About this task

There are three utilities that are useful when you use SPT:

  • Sptreset - If a problem occurs when exiting SPT in an unusual manner, and the system configuration is not normal, type the following in a C-shell: cd /usr/g/service/cclass/spt

    sptreset Enter

    This puts all the files and configuration values back in their original condition.

  • T File Cleanup - File space management tool. It cleans up the /usr/g/service/data directory. See the procedure for T File Cleanup for more information (found in Software > System level software utilities in the documentation).

  • WhatFailed - A quick way to know which SPT tests failed. The preferred way to see the SPT results is by using Report Manager and SPT Stability Viewer (if applicable). This utility scans through user-selected SPT result files and reports what portion of the test failed, and the actual result and test spec for that test.

    Figure 4. WhatFailed Application

    To run the WhatFailed utility, you can either:

    • Open a C-shell from the Common Service Desktop, then type: whatFailed (case sensitive) and press Enter

      or

    • Select the WhatFailed button on the System Performance Test GUI.

      A menu of all the SPT files for that system displays. Select one of the tests (or quit). The utility reads the file comparing each test (except for Coherent Noise) against its limits.

      If there are no failing values in the file, you see the following message:

      WhatFailed does not check Eddy Current results. Please use Report Manager to see Eddy Current PASS/FAIL and specs.

      Press Enter to continue. The system displays each failure it finds one at a time. Press Enter to move through the list of failures.

Topic ID: id_SL1727439-1178786

Viewing Results - Report Manager Tool

About this task

After SPT has finished the analysis, the data files can be viewed using the Report Manager Tool.

Topic ID: id_SL1727446-1178786

Viewing Specification Files

About this task

The specification files can be viewed using a text editor. Compare the results from the Report Manager tool with the values in the specification files to determine which parameter is out of specification.

Procedure

  1. Note:

    The limits shown for specification files in this SPT procedure are for illustration purposes only. Actual specifications are contained in the files on the system.

    SPT Specification Files (path /export/home/service/cclass/spt/ )
    Table 4. SPT Specification Files
    Parameters File Name
    Fast Recalled Echo (FSE) Stability Specification File fsestb.spt
    Gradient Recalled Echo (GRE) Stability Specification File grestb.spt
    Signal to Noise (SNR) File snr.spt
  2. Viewing Phantom Position Check Results

    After finishing the phantom position check, a results file is created. It contains the measured results of phantom offset, shape offset, and phantom size. The latest head phantom and body phantom result files are saved under /usr/g/service/cclass/spt as SPT_pos.result.head and SPT_pos.result.body, respectively. The formats of the two files are the same. Lines four, five, and six in those files are the detailed results from the phantom position check.

    Here is an example of the result file for body phantom position check (SPT_pos.result.body):


                      #Axial,xcent_offset,ycent_offset,xsize,ysize (mm)= 0 11 264 253
    #Sagittal,ycent_offset,zcent_offset,ysize,zsize (mm)= 11 0 252 257
    #Coronal,xcent_offset,zcent_offset,xsize,zsize (mm)= 2 2 263 253
    #X offset= L 1 mm; Y offset= A 11 mm, Z offset= S 1 mm
    #X size=259 mm; Y size=253 mm, Z size=260 mm
    #Shape offset Axial p=4 %; Sagittal p=2 %, Coronal p=4 %

                    

    In the example above, line four shows that the final phantom offset is 1 mm on L (left) direction along X-axis, 11 mm on A (anterior) direction along Y-axis, and 1 mm on S (superior) direction along Z-axis. Line five shows that the phantom size is 259 mm, 253 mm, 260 mm along X-axis, Y-axis, and Z-axis, respectively. Line six shows that the shape offset will be 4%, 2%, and 4% for Axial, Sagittal, and Coronal images, respectively.

    In addition, SPT saves phantom position check images in JPG format under /usr/g/service/cclass/spt as autoshim_head.jpg and autoshim_body.jpg for head phantom check and body phantom check, respectively.

    The specs for the phantom position checks are:

    • Phantom offset: Less than 15 mm along Z direction

    • Phantom size:

      • For head TLT phantom, acceptable body phantom size range is 136 mm to 204 mm

      • For body TLT phantom, acceptable body phantom size range is 216 mm to 324 mm

    • Shape offset: Less than 15%

    Note:

    Use the Gimp tool to view the JPG files. To start Gimp, open a C-shell and type: gimp.

Topic ID: id_15003241

Finalization

Procedure

  1. Complete a TPS reset, which takes a few minutes, after completing SPT.
  2. If for any reason an SPT scan is aborted, check the error log to determine why, and then determine next steps.
  3. Remove service equipment from the system.