Stream: implementers
Topic: How to capture in FHIR the dose of agent or radiation del...
Email Gateway (Jun 03 2021 at 16:32):
From: Olga Vovk <ovovk@samvit-solutions.com>
Dear all,
I need to know how to capture in FHIR
1. the dose of radiation delivered to the patient over the length of the image acquisition
2. the dose of agent (e.g. gadolinium) delivered to the patient over the length of the image acquisition
And I am lost on which resource to use for ## 1 and 2.
Thank you!!!
Olga Vovk
<:3)))~~~~
Lloyd McKenzie (Jun 03 2021 at 17:59):
I think the first would be an Observation. The second would be MedicationAdministration. I believe there's a new IG under development intended to standardize the first.
Elliot Silver (Jun 03 2021 at 18:03):
Lloyd McKenzie said:
I believe there's a new IG under development intended to standardize the first.
https://confluence.hl7.org/display/IMIN/Radiation+Dose+Summary+for+Diagnostic+Procedures+on+FHIR
Olga Vovk (Jun 03 2021 at 18:29):
And a follow up to my previous question regarding image acquisition,
To keep all questions in one place.
I also need to be able to capture not only the start of imaging study/procedure, but also
- The time when the imaging acquisition ended
- The relative time between the procedure which precedes the imaging acquisition and the start time of actual imag8ng acquisition.
I hope I explained it clearly.
Thank you!
Olga
Lloyd McKenzie (Jun 03 2021 at 18:35):
In general, we don't capture relative time. We capture actual times and you can calculate relative times between whatever you like. However, you could use the http://build.fhir.org/extension-cqf-relativedatetime.html to convey a relative time if that's all you have or if there's a reason you need to convey a relative time in addition to an actual time.
For the first, my understanding of convention is that images can be added to a study far into the future so the notion of "acquisition ended" doesn't really hold @Elliot Silver?
Elliot Silver (Jun 03 2021 at 18:48):
Partially correct Lloyd. Because instances (images) can be added to a DICOM study at any point (for example, someone decides to do a 3D reconstruction a month later), the ImagingStudy resource follows DICOM practice and only records when the first image is obtained. However, the associated Procedure does have bounded times which can be recorded in Procedure.performedPeriod.
Elliot Silver (Jun 03 2021 at 18:53):
For item 2, I suggest Procedure.usedReference could be used to get all the procedures performed on that modality device, then look at the time between procedures.
However, I'd also suggest looking at the IHE SOLE profile, which describes how to track those sort of performance metrics. It isn't using FHIR, but it is a standard approach.
Olga Vovk (Jun 07 2021 at 14:19):
Hi Lloyd and Elliot,
Thank you so much for your answers.
Procedure.performedPeriod works for my purpose.
The only question I have is how can I link the Procedure.performedPeriod to the ImagingStudy?
Should I use ImagingStudy.procedure element?
Thank you!
Olga
Lloyd McKenzie (Jun 07 2021 at 14:39):
Yes
Olga Vovk (Jun 07 2021 at 15:43):
HI Lloyd and Elliot,
Thank you!
I will go with Observation for #1.
Best,
Olga
Last updated: Apr 12 2022 at 19:14 UTC
