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·
total number of particles imaged (counted)
·
field of view dimensions (based on a calibration factor for microns/pixel)
·
depth and width of the flow cell
·
total number of frames that were collected
Fluid Volume for AutoImage Mode
The value for Fluid Volume Imaged for AutoImage mode is automatically generated at the end of a run
using the method shown below under Particle Concentration Calculation. The value for “Fluid Volume
Imaged” corresponds to the actual number of milliliters that were imaged for that particular AutoImage
analysis.
Particle Concentration Calculation: AutoImage Mode
A summary of the following calculation description can be found in Appendix III. For AutoImage
Mode analysis, the method to determine particle concentration of an unconstrained camera field is as
described in the following paragraph.
There are several values that are measured by VisualSpreadsheet that are required for the calculation of
Particle Concentration (P/mL or PPM):
·
Particle Count
·
Area Based Diameter (ABD) of each particle
·
Equivalent Spherical Diameter (ESD) of each particle
·
Total number of camera images taken for the full duration of the analysis
There are also several parameters that are user defined that VisualSpreadsheet uses in the calculation:
·
Acceptable range of camera view
·
Flow cell depth (D) in µm
The acceptable range of camera view is dependent on the properties of the digital camera. Depending
on the model of the digital camera, the maximum and minimum number of pixels may be different than
the values used below in the example calculations. Typical values for camera pixels are 1024 x 768 and
1280 x 960. The FlowCAM will arrive with factory default settings that include the correct values for
the installed digital camera. VisualSpreadsheet determines the acceptable region within the camera’s
field of view by the following process. Note that the acceptable range of the camera can be changed or
“constrained” by the user:
Left
= user-specified number (default value = 0 pixels)
Right
= user-specified number (default value = 1279 pixels)
Top
= user-specified number (default value = 0 pixels)
Bottom
= user-specified number (default value = 959 pixels)
With these numbers specified, VisualSpreadsheet
can then determine the height and width of the
acceptable region with the following calculations: