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You’re transitioning from using a Lynx to the myQA Phoenix and Sphinx Compact. How can you determine if your image is a good image?

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Question:

You’re transitioning from using a Lynx to the myQA Phoenix and Sphinx Compact. How can you determine if your image is a good image?

Answer:

For Phoenix and Sphinx Compact: Focus on Count Limits

  1. The key indicator for a good image is count limit, not image intensity.
  2. Refer to the count limit specifics for your devices in the detailed guide: Phoenix Sampling Frequency Article.

For Lynx (Historical Approach): Lynx Range

  1. In myQA FastTrack, images were scaled according to original intensity in the Lynx Range.
    • Signal thresholds were 30% minimum (under-irradiation) and 90% maximum (over-irradiation).
    • Adjustments included modifying the iris or MU per spot to address saturation or low signal.
  2. For detailed guidance, see: Recommended Intensity Exposure of Lynx.

Phoenix and Sphinx Compact: Revised Process

  1. These devices have a larger original intensity range due to the ability to change capacitors via gain values.
  2. Images are displayed in Image Max; Lynx Range isn’t available.
  3. Thresholds for 90% and 30% intensity are less relevant. Focus on counts instead of intensity.

Steps for Phoenix & Sphinx Compact:

1. Focus on Total Counts:

  • Adjust the gain values to address saturation or low SNR.
  • Refer to the guide for selecting the gain based on energy and MU/Spot: Gain Value Selection Guide.

2. Check Saturation Warnings:

  • After capturing an image, the software will display a yellow triangle on the measurement if saturation occurs.

3. Analyze Total Counts:

  • Profile Tab:
    • In myQA FastTrack, go to Profile > Analysis.
    • Change Normalization to "Raw Data (cnt)" for spot profiles.
  • Multiple Spot Analysis:
    • Analyze counts using both 1-D Gaussian Fit and 2-D Gaussian Fit.

4. Count Values Per Frame:

  • Ensure counts don’t exceed 65536 counts per frame.
  • Locate measurement settings in the bottom-right corner of myQA FastTrack after capturing spots.

Additional Reading: