Discovery QDR Series Technical Manual
4-43
LOT_N = 1718.52 Automatic Low Tissue attenuations values in "raw A/D"
numbers.
These values are used to determine the thickness of a
patient being scanned in an
AP array scan mode. They
are updated whenever a spine
array scan is added to
the QC database (i.e. the daily array QC scan) or in
FSCAL.
ACF = 1.021550 Fact. or F.S. Area Correction Factor for AP Spine and Hip scans
BCF = 1.005450 Fact. or F.S. Bone Correction Factor for AP Spine and Hip scans
SFF = 1.083600 1.095000 Factory Spine Fan Factors
LFF = 0.943000 0.954000 Factory Lateral Fan Factors
HFF = 1.077300 1.120000
1.077300 1.120000
1.077300 1.120000
1.077300 1.120000
Factory Hip Fan Factors
Multiplication factors for BCF & ACF array scans.
These values are the same on all Discovery models.
ARRC.TXT Variables Set by… Descriptions
T0_NL = 6.00 Factory Width of the phantom shipped with the discovery.
This value is the same for all phantoms.
HIA_NL = 0.00 Automatic Hi Air - Lateral
LOA_NL = 0.00 Automatic Lo Air - Lateral
HIT_NL = 0.00 Automatic Hi Tissue - Lateral
LOT_NL = 0.00 Automatic Lo Tissue - Lateral
ACFL = 1.021550 Fact. or F.S. Area Correction Factor for Lateral scans.
BCFL = 1.005450 Fact. or F.S. Bone Correction Factor for Lateral scans.
HIA_NF = 1319.16 Factory Hi Air,
LOA_NF = 1634.86 Factory Low Air,
HIT_NF = 1402.73 Factory Hi Tissue, and
LOT_NF = 1730.71 Factory Low Tissue attenuations values in "raw A/D"
numbers.
Factory values for AP array scans. Used as reference
for the software to determine if the Hi/Low values are
out of factory range.
HIA_NLF = 0.00 Factory Hi Air
LOA_NLF = 0.00 Factory Lo Air
Not used in the
DISCOVERY
Factory Hi Tissue
LOT_NLF = 0.00 Factory Lo Tissue
QC_HILO_MIN = 50.0 Factory Day-to-day drift check warning message limit.
QC_HILO_MAX = 100.0 Factory Day-to-day drift check error message limit.
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