Topics covered in this article include:

• Introduction
• Configuration
• Adding Tests to QA Templates
  •      TrueBeam MPC Version 2.5
  •      TrueBeam MPC Version 2.7
  •      Halcyon MPC All Versions
• Importing MPC Data

Introduction

MPC is a Varian tool used with the Isocal phantom to verify the operation of TrueBeam and Halcyon linacs.

The following beam check tests are provided:  

• Beam output constancy check
• Beam profile constancy check
• Beam center shift

Additionally the following geometry tests are provided:

• Treatment isocenter size/location
• The coincidence between treatment isocenter and MV and  kV imaging isocenters
• Collimator rotation offset
• Gantry positioning accuracy
• Couch position accuracy up to 6 degrees of freedom
• MLC leaf position and reproducibility
• Jaw position accuracy

Users should follow Varian recommendations on the use of MPC in addition to the existing QA checks.

Configuration

Before attempting to configure the MPC Import, ensure that the following is available:

• the latest Equipment Hub version is installed
• the serial number of the linac
• the location of the MPC files
• the list of energies that will be captured

Please see the Connecting Daily QA Devices article for details on how to set up and configure MPC imports.

Adding Tests to QA Templates

MPC Import tests can be added to QA templates in the same manner as selecting other tests when setting up your QA templates and schedules. MPC tests are listed under the MPC Import section. The MPC Import tests can be combined with other test types to customize the template.

The recommended tests vary by the version of MPC used. See the following sections for test recommendations. 

TrueBeam MPC Version 2.5

Below is the test selection window under the template creation page. The recommended tests for use with TrueBeam MPC version 2.5 are selected in the graphic. Note that MPC configurations vary and not all tests may be available at all facilities.

TrueBeam MPC Version 2.7

Below is the test selection window under the template creation page. The recommended tests for use with TrueBeam MPC version 2.7 are selected in the graphic. Note that MPC configurations vary and not all tests may be available at all facilities.

Halcyon MPC All Versions

Below is the test selection window under the template creation page. The recommended tests for use with TrueBeam Halcyon MPCs are selected in the graphic. Note that MPC configurations vary and not all tests may be available at all facilities.

Importing MPC Data

Once the schedule containing the MPC Import tests are created and configured, performing QA and importing data is fast and simple.

1. Open the Schedules page.
2. Click the schedule containing the MPC Import tests you wish to perform. The data entry page will open.  
3. At the top of the page in the "QA Device date filter" box, set the date to the date for which you wish to import data and click the Get MPC Import results button.
4. All data for a given date will be imported. If more than one MPC check has been run on the given date, only the most recent will be included on the report. If no data exists, a notification will appear saying no MPC results could be found. In this case, check the date, the serial number in the QA settings and then the path in the Equipment Hub setup.