Set up dcm4chee-proxy to whilelist DICOM files based on attributes

[Luke deGruchy]

I'm very new to dcm4chee-proxy and would like to use it as a filter to only send DICOM that conforms to certain attribute values.

As a very simple example, any DICOM with a modality of US would be sent to MY_AE_TITLE, but any DICOM with any other modality, say, CT, would be sent nowhere.

I'm currently struggling to get this to work.   For instance, I've set up a forwarding rule in dcm4chee-wizard with a destination URI of aet:MY_AE_TITLE_1, which will always occur, regardless of how I set up MPPS to Dose SR Template URI and/or Dose SR IOD Template URI.   This also happens regardless of my SOP instance UID.   Nothing every gets sent to MY_AE_TITLE_2.

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">

    <xsl:output method="xml"/>

    <xsl:template match="/NativeDicomModel">

        <Result>

            <xsl:choose>

                <xsl:when test="DicomAttribute[@tag='00080018']/Value = '1.2.3.4'">

                    <Destination aet="MY_AE_TITLE_2"/>

                </xsl:when>

                <xsl:otherwise>

                    <Destination aet="DEVNULL"/>

                </xsl:otherwise>

            </xsl:choose>

        </Result>

    </xsl:template>

</xsl:stylesheet>

So my goal in this example is to ensure that only DICOM with SOP instance UID 1.2.3.4 gets sent to MY_AE_TITLE_2 while DICOM with any other SOP instance UID goes nowhere.   DEVNULL is just an example of non-existent AE title.

Is there something I'm missing?   Sorry, but I've had a really hard time finding documentation on this, and would appreciate any help you can provide.

[Luke deGruchy]

Sorry, but I'm bumping this.

Is this a feature of dc4chee-proxy, or is this unsupported?

[Hesham Elbadawi]

Hi Luke,

First of all ultrasound is not MPPS.

Basically if i understand correctly what you are trying to do is only receive ultrasounds to MY_AE_TITLE_1 and ignore everything else.

so what you should do is either setup one device DEVULL as a dicom STORESCP that ignores all received files 
(This is easily done with the dcm4che3 library using the ignore option of the STORESCP)
and not just forward to a destination that doesn't exist otherwise your proxy will try and repeat many time before failure which causes a load.

Another way is to forward to a DEVULL that you set up that has a host that doesn't exist on your network 

however modify the connection exception parameter 
dcmRetryNum to 0

This is done with the following config 

<node name="dcmRetry">
  <map/>
  <node name="AssociationStateException">
    <map>
      <entry key="dcmDeleteAfterFinalRetry" value="true"/>
      <entry key="dcmRetryDelay" value="1"/>
      <entry key="dcmRetryNum" value="0"/>
      <entry key="dcmRetryObject" value="AssociationStateException"/>
    </map>
  </node>
  <node name="ConnectionException">
    <map>
      <entry key="dcmDeleteAfterFinalRetry" value="true"/>
      <entry key="dcmRetryDelay" value="1"/>
      <entry key="dcmRetryNum" value="0"/>
      <entry key="dcmRetryObject" value="ConnectionException"/>
    </map>
  </node>
</node>

Second is to have the following xsl in your configuration path for JBoss.


<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">

  <xsl:output method="xml"/>
  <xsl:template match="/NativeDicomModel">
    <Result>
      <xsl:choose>

        <xsl:when test="DicomAttribute[@tag='00080060']/Value = 'US'">
          <Destination aet="MY_AE_TITLE_1"/>

        </xsl:when>
        <xsl:otherwise>
          <Destination aet="DEVNULL"/>
        </xsl:otherwise>
      </xsl:choose>
    </Result>
  </xsl:template>
</xsl:stylesheet>

Third you need to setup one single forward rule that looks like the following:

<node name="dcmForwardRule">
  <map/>
  <node name="MyRule">
    <map>
      <entry key="cn" value="MyRule"/>
      <entry key="dicomDescription" value="Example ForwardRule"/>
      <entry key="labeledURI.#" value="1"/>
      <entry key="labeledURI.1" value="${jboss.server.config.url}/dcm4chee-proxy/myxslrule.xml"/>
    </map>
  </node>
</map>
</node>

Now all modality of type US will be accepted and forwarded to destination My_AETITLE_1 and everything else dropped.

Regards,
Hesham