Is there a way to get the size of a DICOM file before downloading it from DICOMweb?

[psavery]

When retrieving a DICOM instance (via WADO-RS retrieve instance), is it possible to obtain the size of the DICOM file, without having to stream the entire thing?

For instance, I have a local dcm4chee server, and if I run code like this:

import requests
url = 'http://localhost:8008/dcm4chee-arc/aets/DCM4CHEE/rs/studies/2.25.25644321580420796312527343668921514374/series/1.3.6.1.4.1.5962.99.1.3205815762.381594633.1639588388306.2.0/instances/1.3.6.1.4.1.5962.99.1.3205815762.381594633.1639588388306.15.0'
result = requests.get(url, stream=True)

It would be very helpful to know either the DICOM file size, or the number of bytes that will be streamed, before streaming (or after only streaming the header). I don't see a Content-Length in result.headers. Is there another way to know how large the DICOM file is (or how much data will be streamed)? Maybe there is something in the DICOMweb standard I am missing?

For the imaging data commons server, the request does return the content length:

import requests

url = 'https://proxy.imaging.datacommons.cancer.gov/current/viewer-only-no-downloads-see-tinyurl-dot-com-slash-3j3d9jyp/dicomWeb/studies/2.25.227261840503961430496812955999336758586/series/1.3.6.1.4.1.5962.99.1.1334438926.1589741711.1637717011470.2.0/instances/1.3.6.1.4.1.5962.99.1.1334438926.1589741711.1637717011470.36.0'

result = requests.get(url, stream=True)
print(result.headers['Content-Length'])
# '5479856'

I can use the Content-Length, along with the multipart/related boundary size and streaming a little header information in, to figure out exactly how large (in bytes) the DICOM file is, without having to stream the whole thing.

Is there a way to get the DICOM file size in dcm4chee without streaming the whole thing?

[vrindanayak]

Storage Object Size (7777,1053) is a private attribute available on INSTANCE level and can be made use of in your case.

If you have all the UIDs (Study / Series / SOP), you can make use of Search for Instances of Series of Study REST API by passing query filters SOPInstanceUID=<value>&includefield=all - eg.

curl -X GET 'http://localhost:8080/dcm4chee-arc/aets/DCM4CHEE/rs/studies/1.2.392.200036.9125.0.199212251200.28/series/1.2.392.200036.9125.0.199212251200.28/instances?SOPInstanceUID=1.2.392.200036.9125.0.19950720105315&includefield=all' > instance.json

grep -iR "77771053" instance.json 
[{"00080008":{"vr":"CS","Value":["ORIGINAL PRIMARY"]},"00080012":{"vr":"DA","Value":["19950720"]},"00080013":{"vr":"TM","Value":["105314.0000"]},"00080016":{"vr":"UI","Value":["1.2.840.10008.5.1.4.1.1.1"]},"00080018":{"vr":"UI","Value":["1.2.392.200036.9125.0.19950720105315"]},"00080020":{"vr":"DA"},"00080030":{"vr":"TM"},"00080050":{"vr":"SH","Value":["FUJI95706"]},"00080054":{"vr":"AE","Value":["DCM4CHEE"]},"00080056":{"vr":"CS","Value":["ONLINE"]},"00080060":{"vr":"CS","Value":["CR"]},"00080061":{"vr":"CS","Value":["CR"]},"00080062":{"vr":"UI","Value":["1.2.840.10008.5.1.4.1.1.1"]},"00080070":{"vr":"LO","Value":["FUJI PHOTO FILM CO. LTD."]},"00080080":{"vr":"LO","Value":["N.C.C. HIGASHI"]},"00080090":{"vr":"PN"},"00081090":{"vr":"LO","Value":["IRS"]},"00081190":{"vr":"UR","Value":["http://localhost:8080/dcm4chee-arc/aets/DCM4CHEE/rs/studies/1.2.392.200036.9125.0.199212251200.28/series/1.2.392.200036.9125.0.199212251200.28/instances/1.2.392.200036.9125.0.19950720105315"]},"00083002":{"vr":"UI","Value":["1.2.840.10008.1.2"]},"00100010":{"vr":"PN","Value":[{"Alphabetic":"KOBAYASHI^MOMOE"}]},"00100020":{"vr":"LO","Value":["PID-B"]},"00100021":{"vr":"LO","Value":["JMS"]},"00100030":{"vr":"DA","Value":["19790408"]},"00100040":{"vr":"CS","Value":["F"]},"00180015":{"vr":"CS","Value":["EXTREMITY"]},"0020000D":{"vr":"UI","Value":["1.2.392.200036.9125.0.199212251200.28"]},"0020000E":{"vr":"UI","Value":["1.2.392.200036.9125.0.199212251200.28"]},"00200010":{"vr":"SH"},"00200011":{"vr":"IS"},"00200013":{"vr":"IS","Value":["28"]},"00201200":{"vr":"IS","Value":["1"]},"00201206":{"vr":"IS","Value":["1"]},"00201208":{"vr":"IS","Value":["1"]},"00201209":{"vr":"IS","Value":["1"]},"00280010":{"vr":"US","Value":[1760]},"00280011":{"vr":"US","Value":[1760]},"00280100":{"vr":"US","Value":[16]},"77770010":{"vr":"LO","Value":["DCM4CHEE Archive 5"]},"77771010":{"vr":"DT","Value":["20241021170039.213+0200"]},"77771011":{"vr":"DT","Value":["20241021170039.231+0200"]},"77771020":{"vr":"DT","Value":["20241021170039.218+0200"]},"77771021":{"vr":"DT","Value":["20241021170039.218+0200"]},"77771022":{"vr":"DT","Value":["20241021170039.218+0200"]},"77771028":{"vr":"LO","Value":["fs1"]},"77771029":{"vr":"UL","Value":[6196]},"7777102A":{"vr":"US","Value":[280]},"7777102D":{"vr":"DT","Value":["20241021170039.218+0200"]},"77771030":{"vr":"DT","Value":["20241021170039.221+0200"]},"77771031":{"vr":"DT","Value":["20241021170039.221+0200"]},"77771037":{"vr":"AE","Value":["STORESCU"]},"77771040":{"vr":"DT","Value":["20241021170039.223+0200"]},"77771041":{"vr":"DT","Value":["20241021170039.223+0200"]},"77771050":{"vr":"LO","Value":["fs1"]},"77771051":{"vr":"LO","Value":["2024","10","21","DD074A6F","DD074A6F","957CDF49"]},"77771052":{"vr":"UI","Value":["1.2.840.10008.1.2"]},"77771053":{"vr":"UL","Value":[6196280]},"77771054":{"vr":"LO","Value":["762D5250AD3C51BE87B3EC89EC1F4CC7"]},"77771068":{"vr":"AE","Value":["DCM4CHEE"]},"77771069":{"vr":"UR","Value":["dicom:view-localhost:48755"]},"7777106A":{"vr":"UR","Value":["dicom:localhost:11112"]},"7777106F":{"vr":"DT","Value":["20241021170039.221+0200"]}}]