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PROGRAM:

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

+xd --prefer-deflated
prefer deflated explicit VR little 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

deflate compression level (only with --prefer-deflated):

+cl --compression-level [l]evel: integer (default: 6)
0=uncompressed, 1=fastest, 9=best compression

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 behavior 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 behavior can be changed with the --prefer options (see
above).

If compiled with zlib support enabled (see --version output) and if option --prefer-
deflated is used, also the following transfer syntax is accepted.

DeflatedExplicitVRLittleEndianTransferSyntax 1.2.840.10008.1.2.1.99

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
(0010,2297) Responsible Person
(0010,2298) Responsible Person Role
(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:

(0008,0020) StudyDate
(0008,0030) StudyTime
(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
(0010,0021) IssuerOfPatientID
(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
(0010,2297) Responsible Person
(0010,2298) Responsible Person Role
(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 behavior 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 one 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 behavior 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) 1996-2014 by OFFIS e.V., Escherweg 2, 26121 Oldenburg, Germany.

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