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The user should use Trigger Mode when the sample contains fluorescent particles or organisms and you
want to capture only these specific particles. Additionally, use Trigger Mode if you have a very dilute
sample and you wish to ensure that you capture an image of the entire particle, rather than risk capturing
only a partial image (which can occur in AutoImage Mode).
Particle Concentration Calculation: Trigger Mode
For additional information regarding this calculation, please refer to the section “Particle Concentration
Calculation: AutoImage Mode”. In Trigger Mode, the concentration of particles in the sample fluid
imaged is a function of:
·
number and properties of particles in the sample fluid
·
width of the field of view
·
width of the flow cell
·
total volume of sample fluid that passed through the flow cell
The software will calculate the actual number of milliliters that passed through the field of view. For
Trigger Mode runs, the value for Fluid Volume is the total number of millilitres that passed through the
instrument.
Trigger Mode Setup
In Trigger Mode Setup (F8) (Setup Menu or Hotkey = F8), the user can view the rate of triggering. This
is similar to the Setup and Focus Mode described above, however, a camera image of the field of view is
captured only when the predetermined fluorescence or light scatter threshold is exceeded by a particle.
Note that before exiting this mode or while paused, the image in the viewer can be saved (this will be
described in detail in Section Four).
Trigger Mode (No Save)
In Trigger Mode (No Save) (Setup Menu or Hotkey = F9), the user can view the rate of triggering and
observe how the software will segment the field of view image into the collage window. This Mode is a
good tool to use to test the effects of using different context settings and to make a final adjustment of
the focus.
Trigger Mode: Fluorescence (Channels 1 & 2) and Laser Light Scatter
For this mode, the user chooses “Trigger Mode” from the pull down Analyze menu (Hotkey = F5).
When triggering on fluorescence, the field of view is imaged when the intensity of fluorescence of
passing particles exceeds a user set threshold. When triggering on light scatter, the field of view is
imaged when the intensity of the light scatter signal exceeds a user set threshold. Measured values are
then saved with the images (along with all other relevant statistics and particle properties).
Important Information Regarding Trigger Mode
As you attempt to optimize an analysis done in Trigger Mode, it is important to note that there are a few
factors that may affect the performance of your FlowCAM in Trigger Mode.