1. Splunk at Maastro Clinic
More with (Varian) log files…

2. Applications of log files Splunk demo Questions and/or discussion
Contents
Introduction
Varian log formats
Applications of log files
Splunk demo
Questions and/or discussion

3. > 13 jr experience as a MPE in Maastro Clinic
Van wie bin ie d’r iene?
Jonathan Martens
> 13 jr experience as a MPE in Maastro Clinic
Worked with Elekta, Siemens and Varian linacs
+31 (0)

4. Varian has several log formats
Varian log formats
Varian has several log formats
flat text logs (~100MB/day, per machine)
trajectory logs (binary, ~6 MB/min, per beam)

5. Samples with a frequency of 50Hz Capable of sampling 250 “axis”
Trajectory log files
Samples with a frequency of 50Hz
Capable of sampling 250 “axis”
Stores actual and expected value per “axis” as a pair
Stores tracking (gated-RT) data as well

6. Trajectory log files Individual beam settings are sampled (shown for a prostate treatment field)

7. Trajectory log files Individual beam parameter values can be combined to new parameter values

8. Practical use of trajectory log files
Dose prediction based on actual machine dynamics when no PRE is possible using EPID

9. Challenges with flat text log files
Very detailed, in most cases too detailed
Wat is useful, what isn’t?
No filtering, statistics and reporting
How to analyze/narrow in on the problem quickly?

10. Agony Wishes Goals Analyzing is slow, tedious and difficult
Quick and effective search
More accurate insight in problems/errors
(Proactive) insight in our machine park
Reporting/dashboard
Alerting

11. “Google” voor log files
What is Splunk?
“Google” voor log files
Storage of logs
Indexing
Extended and powerfull search and stats
Alerting
Reporting
Origin in IT world
License fee: based on amount of data

12. The “beast” under the bonnet
Lots of predefined formats, mostly IT related
Format of logfiles is configurable and defined very flexibel
Field/parameter extraction
key/value pairs
(complex) regular expressions
Possibility to build compound fields/values

13. Some of the search options
Search free text
Search for patient ID
Search for specific linac or (sub)node
Search for interlock/fault code
Search for specific MLC leaf
etc.

14. Some of the visualizations
Raw event lists
Tables
Graphs
Maps
Combinations of the above

15. Enkele Nederlands “success stories”
More at

16. Modular approach Varian Truebeams
Split up in nodes
SPV (supervisor)
CCHU and CCHL (couch)
BGM (beam generation)
STN (stand)
COL (collimator, MLC, jaws)
MVD, KVD and KVS (imaging arms)
XI (kV imaging)
DKB (operating console)

17. BGM
COL
(MLC, jaws, collimator)
KVS
KVD
STN
CCHU
MVD
CCHL

18. Example: linac dashboard
Overview of some parts/parameters and status/problems per machine
Unfortunately not real-time (ATM)
Example 2: KVS shape filter intervention

19. Example: Overheating due to defect top fan
When overheating machine starts reporting temperature, through SPD
Example 3: Overheating

20. Example: treatment session per patiënt
Unfiltered or filtered for “important” moments/actions/events in flow

21. Example: interruption during treatment session
Maastro has automated (PRE) and in-vivo dosimetry using EPID
Report fails for a patient
Machine seems to have interrupted
Example 4: Collission
Example 5: DKB.BeamOff pressed

22. Questions?