findscu: DICOM query (C-FIND) SCU


findscu [options] peer port [dcmfile_in...]


The findscu application implements an SCU for the Query/Retrieve Service Class and the Basic Worklist Management Service Class. findscu only supports query functionality using the C-FIND message. It sends query keys to an SCP and awaits responses. The application can be used to test SCPs of the Query/Retrieve and Basic Worklist Management Service Classes.


peer        hostname of DICOM peer

port        tcp/ip port number of peer

dcmfile_in  DICOM query file(s)


general options

  -h    --help
          print this help text and exit

          print version information and exit

  -v    --verbose
          verbose mode, print processing details

  -d    --debug
          debug mode, print debug information

network options

override matching keys:

  -k    --key  key: gggg,eeee="str" or data dictionary name="str"
          override matching key

query information model:

  -W    --worklist
          use modality worklist information model (default)

  -P    --patient
          use patient root information model

  -S    --study
          use study root information model

  -O    --psonly
          use patient/study only information model

application entity titles:

  -aet  --aetitle  aetitle: string
          set my calling AE title (default: FINDSCU)

  -aec  --call  aetitle: string
          set called AE title of peer (default: ANY-SCP)

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

proposed transmission transfer syntaxes:

  -x=   --propose-uncompr
          propose all uncompressed TS, explicit VR
          with local byte ordering first (default)

  -xe   --propose-little
          propose all uncompressed TS, explicit VR
          little endian first

  -xb   --propose-big
          propose all uncompressed TS, explicit VR
          big endian first

  -xi   --propose-implicit
          propose implicit VR little endian TS only

other network options:

  -to   --timeout  [s]econds: integer (default: unlimited)
          timeout for connection requests

  -ta   --acse-timeout  [s]econds: integer (default: 30)
          timeout for ACSE messages

  -td   --dimse-timeout  [s]econds: integer (default: unlimited)
          timeout for DIMSE messages

  -pdu  --max-pdu  [n]umber of bytes: integer [4096..131072]
          set max receive pdu to n bytes (default: 16384)

        --repeat  [n]umber: integer
          repeat n times

          abort association instead of releasing it

        --cancel  [n]umber: integer
          cancel after n responses (default: never)

  -X    --extract
          extract responses to file (rsp0001.dcm, ...)

transport layer security (TLS) options

transport protocol stack options:

  -tls  --disable-tls
          use normal TCP/IP connection (default)

  +tls  --enable-tls  [p]rivate key file, [c]ertificate file: string
          use authenticated secure TLS connection

  +tla  --anonymous-tls
          use secure TLS connection without certificate

private key password options (only with --enable-tls):

  +ps   --std-passwd
          prompt user to type password on stdin (default)

  +pw   --use-passwd  [p]assword: string
          use specified password

  -pw   --null-passwd
          use empty string as password

key and certificate file format options:

  -pem  --pem-keys
          read keys and certificates as PEM file (default)

  -der  --der-keys
          read keys and certificates as DER file

certification authority options:

  +cf   --add-cert-file  [c]ertificate filename: string
          add certificate file to list of certificates

  +cd   --add-cert-dir  [c]ertificate directory: string
          add certificates in d to list of certificates

ciphersuite options:

  +cs   --cipher  [c]iphersuite name: string
          add ciphersuite to list of negotiated suites

  +dp   --dhparam  [f]ilename: string
          read DH parameters for DH/DSS ciphersuites

pseudo random generator options:

  +rs   --seed  [f]ilename: string
          seed random generator with contents of f

  +ws   --write-seed
          write back modified seed (only with --seed)

  +wf   --write-seed-file  [f]ilename: string (only with --seed)
          write modified seed to file f

peer authentication options:

  -rc   --require-peer-cert
          verify peer certificate, fail if absent (default)

  -vc   --verify-peer-cert
          verify peer certificate if present

  -ic   --ignore-peer-cert
          don't verify peer certificate


Each file supplied on the command line will be sent to the SCP as part of a C-FIND request. The query file must be a valid DICOM data set containing the dataset part of a C-FIND-RQ message. The query file could, for instance, be created with the dump2dcm utility from a script like the following example:

# query patient names and IDs
(0008,0052) CS [PATIENT]     # QueryRetrieveLevel
(0010,0010) PN []            # PatientsName
(0010,0020) LO []            # PatientID

Individual attributes of each file sent can be modified or supplemented using the "-k key" option. For example the command:

findscu -P -k 0010,0010="HEWETT*" caesar 5678 patqry.dcm

will, when sent to the SCP caesar at TCP/IP port 5678, cause any PatientsName attribute in patqry.dcm to have the value "HEWETT*". If such an attribute is present it will be replaced, if absent it will be inserted. The -k option can be present more than once. The value part (after the '=') may be absent causing the attribute to be sent with zero length. It is not possible to replace or insert attributes within sequences using the -k option.

If no file is specified on the command line, the query must be specified completely with one or more "-k key" options.

Each set of response identifers received will be printed to stdout.

DICOM Conformance

The findscu application supports the following SOP Classes as an SCU:

FINDPatientRootQueryRetrieveInformationModel       1.2.840.10008.
FINDStudyRootQueryRetrieveInformationModel         1.2.840.10008.
FINDPatientStudyOnlyQueryRetrieveInformationModel  1.2.840.10008.
FINDModalityWorklistInformationModel               1.2.840.10008.

The findscu application will propose presentation contexts for one of the abovementioned supported SOP Classes depending on command line options (-P, -S, -O or -W). Each proposed presentation context will propose 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 findscu application does not support extended negotiation.


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) 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 share/data/dumppat.txt).


The findscu 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 <PREFIX>/lib/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. 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.


movescu(1), dump2dcm(1)


Copyright (C) 1994-2005 by Kuratorium OFFIS e.V., Escherweg 2, 26121 Oldenburg, Germany.

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