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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


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

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

network options
override matching keys:

-k --key [k]ey: gggg,eeee="str", path or 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 [a]etitle: string
set my calling AE title (default: FINDSCU)

-aec --call [a]etitle: 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

-xd --propose-deflated
propose deflated explicit VR little endian TS
and all uncompressed transfer syntaxes

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

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

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

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)

transport layer security (TLS) options
transport protocol stack:

-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 (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:

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

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

certification authority:

+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


+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:

+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:

-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

output options

-od --output-directory [d]irectory: string (default: ".")
write output files to existing directory d

automatic data correction:

+dc --enable-correction
enable automatic data correction

-dc --disable-correction
disable automatic data correction (default)

C-FIND responses:

+sr --show-responses
always output responses to the logger

-sr --hide-responses
do not output responses to the logger

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


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 [] # PatientName
(0010,0020) LO [] # PatientID

Individual attributes of each file sent can be modified or supplemented using the -k
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 PatientName 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

In earlier versions of findscu, the tag keys were specified without braces around group
and element number, e. g. '0010,0010' instead of '(0010,0010)'. It is recommended
switching to the new syntax; however, the old syntax is still working.

Also -k accepts dictionary names instead of element tags for specifying DICOM elements.
For example, the findscu call above then reads like this:

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

It is also possible to specify sequences, items and nested attributes using the -k option.
In these cases, a special 'path' notation has to be used, e. g.

findscu -W -k "(0040,0100)[0].Modality=CT" caesar 5678

This call queries a worklist server at host caesar for any planned procedures for CT
modalities by specifying tag (0040,0100) 'Scheduled Procedure Step Sequence' and an
attribute 'Modality' in the first item of this sequence with value 'CT'. Details on this
path notation can be found in the documentation of dcmodify.

If no file is specified on the command line, the query must be specified completely with
one or more -k options. If multiple query files are provided, findscu will send multiple
C-FIND requests to the SCP.

Each set of response identifiers received will be output to the logger unless option
--hide-responses, --extract, --quiet or an appropriate logger configuration is used.
Option --show-responses can be used to force the output to the logger.

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). Basically, the
following transfer syntaxes are supported:

LittleEndianImplicitTransferSyntax 1.2.840.10008.1.2
LittleEndianExplicitTransferSyntax 1.2.840.10008.1.2.1
DeflatedExplicitVRLittleEndianTransferSyntax 1.2.840.10008. (*)
BigEndianExplicitTransferSyntax 1.2.840.10008.1.2.2

(*) if compiled with zlib support enabled (see --version output)

Which transfer syntaxes are actually proposed in what order, can be specified with the
--propose options.

The findscu application does not support extended negotiation.


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.


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).


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 <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.

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