• Topic ID: id_23554151
  • Version: 1.0
  • Date: Oct 9, 2018 1:39:06 PM

Beam Quality Scan

Prerequisites

Overview

This document provides instruction how to perform Beam Quality Scan, and check if any air bubble exists in the X-ray Tube.

Beam Quality Scan it to provide a method for service to check if the Tube is at the risk of air bubble inside.

Although FastCAL procedure also shows pop-up message if air bubble in Tube, that detection test can only be done every 7 days, so Beam Quality Scan Tool is to let FE run independent test at any time during troubleshooting.

After Beam Quality Scan is run, the data in recorded in the following file can help identity Tube has air bubble risk:

  • Gesyslog

  • /usr/g/service/state/air_bubble_detection_result.csv

This lpp tool is applicable to the systems below:

1 Flowchart

View the flowchart for detailed process

2 Operation Procedure

NOTE: Before please make sure the Gantry remain idle and no rotation for more than 30 minutes, remove any obstacle in the scan window

Procedure

  1. Select DIAGNOSTICS.
  2. Select Beam Quality Scan to start scan and follow the prompts
  3. After Beam Quality Scan, check azimuth view ratio in files.

    • /usr/g/service/log/gesys_*.log

    • /usr/g/service/state/air_bubble_detection_result.csv

      There should be the following message inside the gesys_*.log file

      1224097570 0 1 Wed Oct 15 19:06:10 2008 230023090 4

      sp3tar dailyPrepRx

      DailyPrepUtils.c 1331

      QUALITY CONTROL SCANS

      Exam: 50004 Series: 1 Scan: 4

      Maximum azimuth view ratio error: 3482.229980

      EN 213

      SR 191

      The air_bubble_detection_result.csv also recorded the scan data as follows:

      Wed Oct 15 19:06:10 2008,50004/1/4,3482.229980

      Wed Oct 15 19:10:49 2008,50005/1/4,3594.299805

      Wed Oct 15 19:16:20 2008,50008/1/1,3872.670898

      Wed Oct 15 19:19:21 2008,50010/1/1,3553.198486

      The last data in each line shows the maximum azimuth ratio too.

      If the Azimuth ration is confirmed to be >20,000, a field engineer should perform air removal, oil compensation and oil flow measurements on the system.

3 Air removal procedure

The instructions for completing Air Removal, Flow Rate Measurement and Heat Exchanger Compensation are included in the system service procedures.