How Do I Perform Typical myQA FastTrack Workflows?

Workflow for use with StarTrack / MatriXX / Dolphin

CASE: Measurement with a table mounted StarTrack for the analysis of profiles, energy, and startup behaviour of a 6 MV photon beam.

Measurement procedure

Step 1

Set the linac gantry angle to 0°. Place the StarTrack on the patient’s table.
Connect the network cable and power cord. Turn on the StarTrack.

Step 2

Use the room lasers and the StarTrack alignment markers to position the StarTrack. Set the SDD = 100 cm.

Step 3

Place the Photon Energy Verification plate on the active area of the StarTrack.

Set up the SW:

Step 1

Click the Measurement ribbon in the myQA FastTrack

Step 2

In the Equipment group, select the desired detector device, and then click Connect.

Step 3

Click Background to measure the background (20 s).

Step 4

If the gantry angle sensor is used, click the Angle Sensor icon, and then follow instruction in the Angle Sensor Calibration

Step 5

In the Measurement group, click Settings:

In the Machine tab: energy = 6 MV, inline/crossline field size = 250.0 mm or as required.

In the Detector tab: Rotation = 0°, SDD = 1000.0 mm, Buildup thickness = 40.0 mm (the thickness of photon Energy Verification plate, 10.0 mm for electron beams); all offsets are 0.

*Water equivalent thickness of energy verification plates:

Photons: 50 mm

Electrons: 20 mm

Optionally in the Calibration tab (if absolute dose required for the profile analysis and no Output Factor calibration available), select the Apply output calibration checkbox

Step 6

Pre-irradiate the detector (recommended: SDD = 100.0 cm: 28 cm ˣ 28 cm (MatriXX), 27 cm x 27 cm (StarTrack); 40 cm x 40 cm (Dolphin, gantry-mounted))

Perform the measurement:

Step 1

Set the linac to: 6 MV, 100 MU, 600 MU/min.

Step 2

In the myQA FastTrack workspace, select the Online mode with sampling time 0.5 s.

Step 3

Click the Start button and immediately turn on the beam.

Step 4

Click the Stop button after the beam finishes.

Analysis procedure

Step 1

Click the Profile/Energy/Startup tab for the corresponding analysis.

Step 2

Select the frame/frameset in the Frameset panel to be displayed.

Step 3

Place the computer cursor on the profile cursor (make sure the   button is de-selected), and press the right mouse and drag it to the desired position. The signal reading is shown in the table on the right. In addition, in the Profiles view, the parameters of the displayed profiles are shown in the lower area of the main display.

 

 Workflow for use with Lynx

Measurement procedure

Step 1

In myQA FastTrack (Lynx measurement), open the Measurement ribbon; select the correct machine and Lynx detector, then click Connect.

Step 2

In the Settings group of the ribbon select Profile:

Step 3

Click the upper-left dropdown box and select Default or a user-defined setting profile or if a newly-define profile should be used, click the Manage profiles box to define a profile and then select this profile in the upper-left dropdown box.

Rotation: select an angle with that the measured image should be rotated, e.g., 90˚ if the image should be rotated 90˚ clockwise.

Vertical Flip: flips the measured image along the Y-axis

Horizontal Flip: flips measured image along the X-axis

Frame duration: 2 sec (example)

Iris opening: 80% (example, at least 35% to avoid distortion)

In the Measurement group:

Step 4

Click Background to perform background measurement (optional, recommended)

Step 5

Select a measurement mode click Start. Measurement starts.

Analysis procedure

Step 1

In the Home ribbon, select Single (or Multiple) in the Analysis group to analyze a single image (or multiple images).

(i) For analysis of single image:

Step 2

Set an image as Reference image

Step 3

define a ROI

Step 4

Click the Test Category dropdown list and select the desired test category.

For Single Spot Analysis, and Homogeneity Analysis, the calculation will start.

For Filed Analysis, Energy Analysis, and Multiple Spot Analysis, a set of settings will be displayed. Modify them if necessary. Then click   to start the calculation.

When it finishes, the results will be displayed.

 

For analysis of multiple images:

Step 1

Select Multiple in the Home ribbon

Step 2

Select the images to be analyzed

Step 3

Enter the analysis parameters

Step 4

Select Multiple Spot Analysis (for the 1^st time calculation) or click  . The calculation will start. When it finishes, the results will be displayed.