Smiths detection HI-SCAN 100100T, User Manual

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How to work with TIP* and OTS XTrain* reports
The meaning of the report fields
The fields at the beginning of all reports mean:
Report : type of the report
Report date : selected period of time of the report
Unit type : type of the HI-SCAN X-ray unit
Serial number : serial number of the HI-SCAN X-ray unit
The other fields, which are variable among the reports mean:
Date : date of an event
Name : name of the operator
Login ID : user ID of the operator
Company/Authority : company or authority the operator works for
Location : installation site (airport or other building) of the HI-SCAN X-ray unit
Subsite : specified location inside the building
Login : point of time the operator has logged in
Logout : point of time the operator has logged out
#BAGs : number of bags scanned or basic images recalled
#TIPs : number of projected fictitious threat images and -objects
Nh : number of threat images and -objects detected (marked with
H
) by the operator
( N umber of H its)
Nfa : number of bags/basic images marked with
H
by the operator, without any threat
projection occurred ( N umber of F alse A larms)
Nm : number of threat images and -objects which have not been detected by the operat-
or ( N umber of M issed objects and images)
Pd : probability that projected threat images and -objects are detected by the operator
( P robability of D etection). Possible values are between 0 and 1. The higher the
value the higher the probability.
Pfa : probability that the operator marks bags/basic images without any threat projec-
tion occurred ( P robability of F alse A larms). Possible values are between 0 and 1.
The higher the value, the higher the probability is.
d' : d erived operator performance factor. Possible values are between −4,7 and +4.7.
The higher the value, the higher the probability is that the operator correctly de-
tects projected threat images and -objects and does not actuate
H
, if no projec-
tions were made.
Response time(sec) : average times needed by the operator to actuate
H
:
Hit : in case of threat images or -objects projected
False : in case of X-ray images without any threat projections
Totals : sum of values listed in a column
Averages : average of values listed in a column
#Shifts : number of shifts a operator has worked on the X-ray unit
Time On (min) : total time (indicated in minutes) a operator was logged in within the selected report
period
Time : point of time of an event
Category : category of a projected threat image or -object
Subcategory : subcategory of a projected threat image or -object
95587413 01/01/09 © Smiths Heimann
I
The designation "False Alarm" is perhaps misleading since also real dan-
gerous objects are marked with
H
. For the evaluation of statistics it makes
sense to keep a list referring to the user which records the number of de-
tected real dangerous objects; this number is subtracted from the number
of false alarms.
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