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NAME
wlmscpfs - DICOM Basic Worklist Management SCP (based on data files)
SYNOPSIS
wlmscpfs [options] port
DESCRIPTION
The wlmscpfs application implements a Service Class Provider (SCP) for the Basic Worklist Management
Service. The application will listen on a specified TCP/IP port for incoming association requests from a
Worklist Management SCU. In case an association was acknowledged and a worklist query was received, the
wlmscpfs application will query particular files in a certain directory (which can be specified through
corresponding program options) on the file system for corresponding worklist information, and it will
send this information back to the calling Worklist Management SCU. Aside from dealing with Worklist
Management queries, the wlmscpfs application also supports the Verification Service Class as an SCP.
PARAMETERS
port tcp/ip port number to listen on
OPTIONS
general options
-h --help
print this help text and exit
--version
print version information and exit
--arguments
print expanded command line arguments
-q --quiet
quiet mode, print no warnings and errors
-v --verbose
verbose mode, print processing details
-d --debug
debug mode, print debug information
-ll --log-level [l]evel: string constant
(fatal, error, warn, info, debug, trace)
use level l for the logger
-lc --log-config [f]ilename: string
use config file f for the logger
multi-process options
-s --single-process
single process mode
--fork
fork child process for each association (default)
input options
general:
-dfp --data-files-path [p]ath: string (default: /home/www/wlist)
path to worklist data files
handling of worklist files:
-efr --enable-file-reject
enable rejection of incomplete worklist files (default)
-dfr --disable-file-reject
disable rejection of incomplete worklist files
processing options
returned character set:
-cs0 --return-no-char-set
return no specific character set (default)
-cs1 --return-iso-ir-100
return specific character set ISO IR 100
-csk --keep-char-set
return character set provided in file
other processing options:
-nse --no-sq-expansion
disable expansion of empty sequences in C-FIND
request messages
network options
preferred network transfer syntaxes:
+x= --prefer-uncompr
prefer explicit VR local byte order (default)
+xe --prefer-little
prefer explicit VR little endian TS
+xb --prefer-big
prefer explicit VR big endian TS
+xi --implicit
accept implicit VR little endian TS only
network host access control (tcp wrapper):
-ac --access-full
accept connections from any host (default)
+ac --access-control
enforce host access control rules
post-1993 value representations:
+u --enable-new-vr
enable support for new VRs (UN/UT) (default)
-u --disable-new-vr
disable support for new VRs, convert to OB
other network options:
-ta --acse-timeout [s]econds: integer (default: 30)
timeout for ACSE messages
-td --dimse-timeout [s]econds: integer (default: unlimited)
timeout for DIMSE messages
--max-associations [a]ssocs: integer (default: 50)
limit maximum number of parallel associations
--refuse
refuse association
--reject
reject association if no implementation class UID
--no-fail
don't fail on an invalid query
--sleep-after [s]econds: integer
sleep s seconds after find (default: 0)
--sleep-during [s]econds: integer
sleep s seconds during find (default: 0)
-pdu --max-pdu [n]umber of bytes: integer (4096..131072)
set max receive pdu to n bytes (default: 16384)
-dhl --disable-host-lookup
disable hostname lookup
NOTES
The semantic impacts of the above mentioned options is clear for the majority of options. Some particular
options, however, are so specific that they need detailed descriptions which will be given in this
passage.
The returned character set options are intended for situations in which the wlmscpfs application will
return attribute values which are not composed of characters from the DICOM default character repertoire.
In such cases, for example option --return-iso-ir-100 can be used to specify that a response to a
modality's worklist management C-FIND request shall contain DICOM's Specific Character Set attribute
(0008,0005) with a corresponding value, indicating the character repertoire from which the characters of
returned attribute values were taken (in this example the repertoire ISO IR 100). Please note that the
wlmscpfs application will not make sure that all returned values are actually made up of this character
repertoire; the application expects this to be the case.
In general, the Specific Character Set attribute (0008,0005) will only be included in the C-FIND response
if it contains any attributes that are affected by the character set, i.e. for value representations PN,
LO, LT, SH, ST and UT.
Please note that a C-FIND request which is handled by this application may contain DICOM's Specific
Character Set attribute (0008,0005), but this application will never use this attribute's value for
matching. Besides, the question if DICOM's Specific Character Set attribute (0008,0005) will be contained
in a C-FIND response which is returned by this application is always determined by the returned character
set option which was specified when this application was started.
The options --enable-file-reject and --disable-file-reject can be used to enable or disable a file
rejection mechanism which makes sure only complete worklist files will be used during the matching
process. A worklist file is considered to be complete if it contains all necessary type 1 information
which the SCP might have to return to an SCU in a C-FIND response message. Table K.6-1 in part 4 annex K
of the DICOM standard lists all corresponding type 1 attributes (see column 'Return Key Type').
DICOM Conformance
The wlmscpfs application supports the following SOP Classes as an SCP:
VerificationSOPClass 1.2.840.10008.1.1
FINDModalityWorklistInformationModel 1.2.840.10008.5.1.4.31
The wlmscpfs application will accept presentation contexts for all of the abovementioned supported SOP
Classes using any of the transfer syntaxes:
LittleEndianImplicitTransferSyntax 1.2.840.10008.1.2
LittleEndianExplicitTransferSyntax 1.2.840.10008.1.2.1
BigEndianExplicitTransferSyntax 1.2.840.10008.1.2.2
The default behaviour of the wlmscpfs application is to prefer transfer syntaxes having an explicit
encoding over the default implicit transfer syntax. If wlmscpfs is running on big-endian hardware it will
prefer BigEndianExplicit to LittleEndianExplicit transfer syntax (and vice versa). This behaviour can be
changed with the --prefer options (see above).
The wlmscpfs application does not support extended negotiation.
Currently, the wlmscpfs application supports the following attributes as matching keys:
(0008,0050) AccessionNumber
(0008,0090) ReferringPhysicianName
(0010,0010) PatientName
(0010,0020) PatientID
(0010,0030) PatientBirthDate
(0010,0040) PatientSex
(0032,1032) RequestingPhysician
(0038,0010) AdmissionID
(0040,0100) ScheduledProcedureStepSequence
(0008,0060) > Modality
(0040,0001) > ScheduledStationAETitle
(0040,0002) > ScheduledProcedureStepStartDate
(0040,0003) > ScheduledProcedureStepStartTime
(0040,0006) > ScheduledPerformingPhysicianName
(0040,1001) RequestedProcedureID
(0040,1003) RequestedProcedurePriority
As return keys the following attributes are currently supported by wlmscpfs:
(0008,0050) AccessionNumber
(0008,0080) InstitutionName
(0008,0081) InstitutionAddress
(0008,0090) ReferringPhysicianName
(0008,1080) AdmittingDiagnosesDescription
(0008,1110) ReferencedStudySequence
(0008,1150) > ReferencedSOPClassUID
(0008,1155) > ReferencedSOPInstanceUID
(0008,1120) ReferencedPatientSequence
(0008,1150) > ReferencedSOPClassUID
(0008,1155) > ReferencedSOPInstanceUID
(0010,0010) PatientName
(0010,0020) PatientID
(0010,0030) PatientBirthDate
(0010,0040) PatientSex
(0010,1000) OtherPatientIDs
(0010,1001) OtherPatientNames
(0010,1020) PatientSize
(0010,1030) PatientWeight
(0010,1040) PatientAddress
(0010,1080) MilitaryRank
(0010,2000) MedicalAlerts
(0010,2110) ContrastAllergies
(0010,2160) EthnicGroup
(0010,21a0) SmokingStatus
(0010,21b0) AdditionalPatientHistory
(0010,21c0) PregnancyStatus
(0010,21d0) LastMenstrualDate
(0010,4000) PatientComments
(0020,000d) StudyInstanceUID
(0032,1032) RequestingPhysician
(0032,1033) RequestingService
(0032,1060) RequestedProcedureDescription
(0032,1064) RequestedProcedureCodeSequence
(0008,0100) > CodeValue
(0008,0102) > CodingSchemeDesignator
(0008,0103) > CodingSchemeVersion
(0008,0104) > CodeMeaning
(0038,0010) AdmissionID
(0038,0011) IssuerOfAdmissionID
(0038,0050) SpecialNeeds
(0038,0300) CurrentPatientLocation
(0038,0500) PatientState
(0040,0100) ScheduledProcedureStepSequence
(0008,0060) > Modality
(0032,1070) > RequestedContrastAgent
(0040,0001) > ScheduledStationAETitle
(0040,0002) > ScheduledProcedureStepStartDate
(0040,0003) > ScheduledProcedureStepStartTime
(0040,0004) > ScheduledProcedureStepEndDate
(0040,0005) > ScheduledProcedureStepEndTime
(0040,0006) > ScheduledPerformingPhysicianName
(0040,0007) > ScheduledProcedureStepDescription
(0040,0008) > ScheduledProtocolCodeSequence
(0008,0100) > > CodeValue
(0008,0102) > > CodingSchemeDesignator
(0008,0103) > > CodingSchemeVersion
(0008,0104) > > CodeMeaning
(0040,0009) > ScheduledProcedureStepID
(0040,0010) > ScheduledStationName
(0040,0011) > ScheduledProcedureStepLocation
(0040,0012) > PreMedication
(0040,0020) > ScheduledProcedureStepStatus
(0040,0400) > CommentsOnTheScheduledProcedureStep
(0040,1001) RequestedProcedureID
(0040,1002) ReasonForTheRequestedProcedure
(0040,1003) RequestedProcedurePriority
(0040,1004) PatientTransportArrangements
(0040,1005) RequestedProcedureLocation
(0040,1008) ConfidentialityCode
(0040,1009) ReportingPriority
(0040,1010) NamesOfIntendedRecipientsOfResults
(0040,1400) RequestedProcedureComments
(0040,2001) ReasonForTheImagingServiceRequest
(0040,2004) IssueDateOfImagingServiceRequest
(0040,2005) IssueTimeOfImagingServiceRequest
(0040,2008) OrderEnteredBy
(0040,2009) OrderEnterersLocation
(0040,2010) OrderCallbackPhoneNumber
(0040,2016) PlacerOrderNumberImagingServiceRequest
(0040,2017) FillerOrderNumberImagingServiceRequest
(0040,2400) ImagingServiceRequestComments
(0040,3001) ConfidentialityConstraintOnPatientDataDescription
The attribute (0008,0005) SpecificCharacterSet is a special case and its support by wlmscpfs is discussed
in the NOTES section above.
Access Control
When compiled on Unix platforms with TCP wrapper support, host-based access control can be enabled with
the --access-control command line option. In this case the access control rules defined in the system's
host access control tables for wlmscpfs are enforced. The default locations of the host access control
tables are /etc/hosts.allow and /etc/hosts.deny. Further details are described in hosts_access(5).
LOGGING
The level of logging output of the various command line tools and underlying libraries can be specified
by the user. By default, only errors and warnings are written to the standard error stream. Using option
--verbose also informational messages like processing details are reported. Option --debug can be used to
get more details on the internal activity, e.g. for debugging purposes. Other logging levels can be
selected using option --log-level. In --quiet mode only fatal errors are reported. In such very severe
error events, the application will usually terminate. For more details on the different logging levels,
see documentation of module 'oflog'.
In case the logging output should be written to file (optionally with logfile rotation), to syslog (Unix)
or the event log (Windows) option --log-config can be used. This configuration file also allows for
directing only certain messages to a particular output stream and for filtering certain messages based on
the module or application where they are generated. An example configuration file is provided in
<etcdir>/logger.cfg).
COMMAND LINE
All command line tools use the following notation for parameters: square brackets enclose optional values
(0-1), three trailing dots indicate that multiple values are allowed (1-n), a combination of both means 0
to n values.
Command line options are distinguished from parameters by a leading '+' or '-' sign, respectively.
Usually, order and position of command line options are arbitrary (i.e. they can appear anywhere).
However, if options are mutually exclusive the rightmost appearance is used. This behaviour conforms to
the standard evaluation rules of common Unix shells.
In addition, one or more command files can be specified using an '@' sign as a prefix to the filename
(e.g. @command.txt). Such a command argument is replaced by the content of the corresponding text file
(multiple whitespaces are treated as a single separator unless they appear between two quotation marks)
prior to any further evaluation. Please note that a command file cannot contain another command file.
This simple but effective approach allows to summarize common combinations of options/parameters and
avoids longish and confusing command lines (an example is provided in file <datadir>/dumppat.txt).
ENVIRONMENT
The wlmscpfs utility will attempt to load DICOM data dictionaries specified in the DCMDICTPATH
environment variable. By default, i.e. if the DCMDICTPATH environment variable is not set, the file
<datadir>/dicom.dic will be loaded unless the dictionary is built into the application (default for
Windows).
The default behaviour should be preferred and the DCMDICTPATH environment variable only used when
alternative data dictionaries are required. The DCMDICTPATH environment variable has the same format as
the Unix shell PATH variable in that a colon (':') separates entries. On Windows systems, a semicolon
(';') is used as a separator. The data dictionary code will attempt to load each file specified in the
DCMDICTPATH environment variable. It is an error if no data dictionary can be loaded.
COPYRIGHT
Copyright (C) 1996-2010 by OFFIS e.V., Escherweg 2, 26121 Oldenburg, Germany.