dcmrecv - Online in the Cloud

PROGRAM:

NAME

dcmrecv - Simple DICOM storage SCP (receiver)

SYNOPSIS

dcmrecv [options] port

DESCRIPTION

The dcmrecv application implements a Service Class Provider (SCP) for the Storage Service
Class. In contrast to the well-known storescp utility, dcmrecv has less options and might,
therefore, be easier to use - this also explains the term 'simple' in the title. The main
purpose of this application is to receive a whole bunch of DICOM datasets from a Storage
Service Class User (SCU) and store them to a configurable directory and file structure.

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

+v --verbose-pc
show presentation contexts in verbose mode

network options
association negotiation profile from configuration file:

-xf --config-file [f]ilename, [p]rofile: string
use profile p from configuration file f

application entity title:

-aet --aetitle [a]etitle: string
set my AE title (default: DCMRECV)

-uca --use-called-aetitle
always respond with called AE title

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

-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

output options
general:

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

subdirectory generation:

-s --no-subdir
do not generate any subdirectories (default)

+ssd --series-date-subdir
generate subdirectories from series date

filename generation:

+fd --default-filenames
generate filename from instance UID (default)

+fu --unique-filenames
generate unique filename based on new UID

+fsu --short-unique-names
generate short pseudo-random unique filename

+fst --system-time-names
generate filename from current system time

-fe --filename-extension [e]xtension: string (default: none)
append e to all generated filenames

storage mode:

-B --normal
allow implicit format conversions (default)

+B --bit-preserving
write dataset exactly as received

--ignore
ignore dataset, receive but do not store it

NOTES

Typical Usage
A typical use case of dcmrecv is to receive SOP instances that are sent from a storage SCU
and save them as DICOM files. The following command does exactly this:

dcmrecv --verbose <port> --config-file storescp.cfg default

If you prefer some automatically created subdirectory structure, shorter file names and
the extension '.dcm' for all DICOM files, use the following command:

dcmrecv -v -xf storescp.cfg default <port> --series-date-subdir
--short-unique-names
--filename-extension .dcm

In case of very large SOP instances or if the dataset should be written exactly as
received (e.g. for debugging purposes), the 'bit preserving mode' could be used:

dcmrecv -v -xf storescp.cfg default <port> --bit-preserving

The received datasets are always stored as DICOM files with the same Transfer Syntax as
used for the network transmission.

DICOM Conformance
Basically, the dcmrecv application supports all Storage SOP Classes as an SCP, including
private ones. This requires, however, that a corresponding association negotiation profile
is loaded from a configuration file. The format and semantics of this configuration file
are documented in asconfig.txt.

By default, that means if no association negotiation profile is loaded, dcmrecv only
supports the Verification SOP Class as an SCP (with default transfer syntax, i.e. Implicit
VR Litte Endian).

In the future, there might be additional options that allow for specifying the list of
supported Presentation Contexts (i.e. combination of SOP Class and Transfer Syntaxes)
directly, i.e. without loading a configuration file.

Subdirectory Generation
The option --series-date-subdir allows for generating subdirectories (below the specified
output directory) based on the value of the data element Series Date (0008,0021) from the
received DICOM dataset. If this value could be retrieved from the dataset and is valid
(i.e. consists of a valid DICOM date field), the subdirectory structure is as follows:

<output-directory>/data/<year>/<month>/<day>/<filename>

If the Series Date (0008,0021) cannot be retrieved or is invalid, the current system date
is used for the following subdirectory structure:

<output-directory>/undef/<year><month><day>/<filename>

In both cases, <year> consists of 4 decimal digits and <month> as well as <day> of 2
decimal digits.

Filename Generation
By default, the filenames for storing the received DICOM datasets are generated according
to the following scheme:

<short-modality-prefix>.<sop-instance-uid><filename-extension>

If the same SOP instance is received twice, a warning message is reported and the existing
file is overwritten.

The option --unique-filenames makes sure that each received DICOM dataset is stored as a
separate file, i.e. no files should ever be overwritten. This is done by using a newly
created unique identifier (UID) for each generated filename (and the infix '.X' in order
to avoid conflicts with real SOP Instance UID values). The naming scheme for this option
is as follows:

<short-modality-prefix>.X.<unique-identifier><filename-extension>

When option --short-unique-names is used, the filenames are generated by some pseudo-
random name generator, which also makes sure that there are no conflicts (i.e. existing
files are not overwritten). This is the naming scheme:

<short-modality-prefix>_<pseudo-random-name><filename-extension>

With <pseudo-random-name> consisting of 16 digits in hexadecimal notation.

Finally, option --system-time-names allows for generating filenames based on the current
system time:

<date><time>.<short-modality-prefix><filename-extension>

With <date> consisting of '<year><month><day>' and <time> of
'<hour><minute><second>.<micro-second>'. Please note that this scheme could result in
naming conflicts if the resolution of the system time is not sufficiently high (i.e. does
not support microseconds).

Limitations
Please note that option --bit-preserving cannot be used together with option --series-
date-subdir since the received dataset is stored directly to file and the value of the
Series Date (0008,0021) is, therefore, not available before the file has been created.

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).

EXIT CODES

The dcmrecv utility uses the following exit codes when terminating. This enables the user
to check for the reason why the application terminated.

general
EXITCODE_NO_ERROR 0
EXITCODE_COMMANDLINE_SYNTAX_ERROR 1

input file errors
EXITCODE_CANNOT_READ_INPUT_FILE 20 (*)

output file errors
EXITCODE_CANNOT_WRITE_OUTPUT_FILE 40 (*)
EXITCODE_INVALID_OUTPUT_DIRECTORY 45

network errors
EXITCODE_CANNOT_INITIALIZE_NETWORK 60 (*)
EXITCODE_CANNOT_START_SCP_AND_LISTEN 64
EXITCODE_INVALID_ASSOCIATION_CONFIG 66

(*) Actually, these codes are currently not used by dcmrecv but serve as a placeholder for
the corresponding group of exit codes.

ENVIRONMENT

The dcmrecv 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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