BAH-4661 - Update Imaging Study Completion DateTime with Study Acquisition DateTime

[subhashydv]

Overview : BAH-4661

This PR enhances the PACS integration by updating the ImagingStudy completion datetime with the actual study acquisition datetime fetched from DCM4CHEE DICOM metadata, including proper handling of timezone offsets.

Changes Made

🆕 New Components

Configuration:

• Added DCM4CHEE configuration properties:

  • dcm4chee.base.url (DCM4CHEE_BASE_URL env variable)
  • dcm4chee.aet (default: DCM4CHEE)
  • dcm4chee.connection.timeout (default: 10000ms)
  • dcm4chee.read.timeout (default: 10000ms)

🔄 Modified Components

ImagingStudyServiceImpl:

• Enhanced updateImagingStudyAsAvailable() to:

  • Fetch DICOM metadata from DCM4CHEE
  • Extract acquisition datetime from metadata (with fallback logic)
  • Add FHIR extension for completion date
  • Update ImagingStudy with both status and completion datetime

🔑 Key Features

1. Timezone Support: Properly handles DICOM datetime with timezone offsets (e.g., +0530, -0500)

2. Fallback Logic: Tries multiple DICOM tags to extract acquisition datetime:

   • Primary: Acquisition DateTime with Offset (0008002A)
   • Fallback 1: Acquisition Date + Time + Timezone Offset
   • Fallback 2: Acquisition Date + Time (local time)

3. FHIR Compliance: Adds completion date as FHIR extension following the URL pattern: http://fhir.bahmni.org/ext/imaging-study/completion-date

4. Error Handling: Gracefully handles missing or invalid metadata

🎯 Technical Details

• Uses JSON PATCH operations to update ImagingStudy resource
• Converts DICOM datetime formats to FHIR-compliant ISO 8601 format
• Supports fractional seconds in DICOM time values
• Thread-safe date parsing using SimpleDateFormat with proper synchronization

[Samridhi-98]

LGTM