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The RES file
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SIMINDcalculates some basic detector parameters by defaults. These appear on the
screen and in the result file [*.RES] together with the input parameters, defined in
CHANGE. Collimator data are only written to the result file if a collimator has been
included. SPECT input parameters are written only if the SPECT flag is set. Also the
scatter fraction and percentage scatter, described below, is only written if a phantom
has been simulated.
The following lists calculated detector parameters
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Solid Angle
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This is the calculated solid angle through which the
photons are forced. The angle is normalized to 4p, that
is, a value of unity equals an isotropic emission.
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Compiler
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This shows the compiler that has been used to compile
the module for which the result file has been obtained.
This information may be of value when comparing
results from versions of
SIMINDfor different operating systems.
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Collimator Efficiency
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The calculated geometric collimator efficiency of the
defined collimator. This parameter is defined as the ratio
of the number of photon passing through the collimator
to the number of emitted photons.
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Compton Area [Spectrum]
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The integral of simulated event from the first channel to
the lower energy window channel.
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Photo Area [Spectrum]
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The integral of simulated events between the lower
energy window channel and the upper energy window
channel.
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Pileup Area [Spectrum]
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The integral of simulated events from the upper energy
window channel to the highest channel in the energy
spectra
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Fraction Compton [Window]
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This is the fraction of events in the energy window that
originates from Compton scattered photons.
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Fraction Photo [Window]
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This is the fraction of events in the energy window that
originates from photons that have been completely
absorbed in the crystal
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Scatter/Primary Ratio [SF]
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This is the ratio between the events from photons
scattered in the phantom to events from photons that
have penetrated the phantom without interaction.
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Scatter/Total Ratio [ST]
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This is the ratio between the events from photons
scattered in the phantom to all events from photons
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Percentage 1st order
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This is the percentage of the scatter events originated
from photons that have been scattered once in the
phantom.
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Photo Absorptions [Crystal]
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This is the number of photoelectric absorption's in the
scintillation crystal.
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Compton Interact [Crystal]
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This is the number of Compton-interactions in the
scintillation crystal.
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Coherent Interact [Crystal]
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This is the number of coherent interactions in the
scintillation crystal.
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Pair Productions [Crystal]
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This is the number of pair interactions in the scintillation
crystal.
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Number of Detector Hits
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This is the number of photons that have reached the
scintillation crystal.
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Maximum in Calculated
Spectra
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This shows the maximum value in the calculated energy
spectra. Note that this value may be less than unity
since the spectra reflects the accumulated weights of
the interacted photons.
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Count Rate [Detector]
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This shows the calculated count rate for the whole
energy spectra. This value is based on the activity,
given by Index 25 in CHANGE.
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Count Rate [Window]
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This shows the calculated count rate for the defined
energy window.
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Efficiency [Window]
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This is the fraction between the number of photons
detected within the energy window and the number of
photons impinging on the crystal.
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Efficiency [Detector]
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This is the fraction between the number of photons
detected in the whole energy spectrum and the number
of photons impinging on the crystal.
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Peak/Compton [Peak]
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The peak to Compton ratio may sometimes be defined as
the maximum in the photo peak divided by the content
in a 'typical' channel below the Compton edge. The
location of this channel may be somewhat arbitrary but
in
SIMIND the channel is located four channels below
the calculated Compton edge, as is calculated from
basic interaction formulas. If there are poor statistics in
the simulation and the particular channel is zero, then
this calculated parameter will also be set to zero.
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Peak/Compton [Area]
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The integral counts in the energy window divided by the
integral of counts below the lower energy threshold [or
the Compton area].
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Peak/Total
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The integral counts in the energy window divided by the
integral of counts in the whole energy pulse- height
distribution.
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Sensitivity
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The count rate in the energy window divided by the
activity defined for the particular simulation [Index 25 in
CHANGE] [cps/KBq].
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Sensitivity
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The count rate in the energy window divided by the
activity defined for the particular simulation [Index 25 in
CHANGE] [cpm/uCi].
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Comments
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An optional comment line defined in
CHANGE [Index 9 in
the MAIN MENU].
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Message
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Sometimes a routine can give a message to the result
file concerning something that may be serious but still
not fatal for the simulation. The text is then displayed
after the "Message" text.
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Additonal information
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If phantoms with index -2 to -6 are used then the volumes, activity, number of pixels and activity
concetrations is given in the result file for each organ/structure
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If the programs that include the jaszak.fsc is used then information about the activity in each of the
spheres are given in the res file
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