QueryRetrieveSize, disociate study and series level ?

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1

Hi there,

I have a general question on the QueryRetrieveSize,

I have an app on the top of Orthanc (called Orthanc_Tools) which provide a GUI for queries.

I have done a similar work than the web interface in the Orthanc web interface, when a Study query is made I show in the interface all Studies answser and then for each click on a study I send a Serie query to retrieve the series details.

In the interface I enabled both retrieve from Studies and Series level.

The problem is :

When the user click on multiple studies to show their content, he generate many Series queries. If he click more than 10 times (QueryRetrievSize default value) then the original Query Study is lost from Orthanc memory and thus break the possibility to make a retrieve at the Study level.

I guess the Orthanc Explorer suffers from the same problem, if the user go series and studies more than 10 times the original study request is lost as well.

I was wondering if it would be better to store independently a QueryRetrieveSize number of Studies request and QueryRetrieveSize of Series request.
It would be safer regarding the retrieve at the study level since the last study query will always be in memory no matters how much Series queries are made since the last study query.

However I imagine that this could introduce a significant amount of change in Orthanc, so it is just a “general question” to put some ideas on the table.

Best regards,

Salim

2

Hello Salim,

The “QueryRetrieveHandler” data structure that stores the result of one query is very lightweight (and does not use much RAM):
https://bitbucket.org/sjodogne/orthanc/src/default/OrthancServer/QueryRetrieveHandler.h

You can safely increase the “QueryRetrieveSize” configuration to, say, 1000.

Regards,
Sébastien-

3

Hi Sebastien,

Thanks for explanations.
I see that the answer strorage have very low footprint.
I wonder it this case if the default value is not too conservative, i would say that it is very unlikely to “scan” up to 100 studies answer but 10 can be easily reached especially with a responsive interface that send query at every single click in the first study level answer list.

My concern is that I doubt that “regular” users will understand what is going on, it is not really simple to explain the technical backgroud of the series/studies query and the rentention limit.

However if that question have never been reached before It may be an erroneous concern, or I may have a different usage than regular user (for me I will fly by changing the value no problem).

Best regards,

Salim

4

Hello,

OK, thanks for the suggestion, it has been integrated:
https://bitbucket.org/sjodogne/orthanc/commits/f509d3c6d5709020c1a3baca0cfc3af80237960b

HTH,
Sébastien-