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Improve RadiopharmaceuticalInformationSequence exception handling to surface data quality issues #93

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Merged
carluri merged 2 commits into from
Nov 9, 2025
Merged

Improve RadiopharmaceuticalInformationSequence exception handling to surface data quality issues #93

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Copilot Nov 9, 2025
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Improve exception handling for RadiopharmaceuticalInformationSequence
Copilot Nov 9, 2025
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45 changes: 27 additions & 18 deletions pytheranostics/imaging_tools/tools.py
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Original file line number Diff line number Diff line change
Expand Up @@ -78,24 +78,33 @@ def load_metadata(dir: str, modality: str) -> ImagingMetadata:
radionuclide = modality.split("_")[0]

# This only applies to Q-SPECT TODO: replace for something more generic.
try:
injected_activity = (
dicom_slices[0]
.RadiopharmaceuticalInformationSequence[0]
.RadionuclideTotalDose
)

# Currently we don't have a way to know the units ... so we use common sense.
if injected_activity > 20000: # Activity likely in Bq instead of MBq
injected_activity /= 1e6
print(
f"Injected activity found in DICOM Header: {injected_activity:2.1f} MBq. Please verify."
)

except (AttributeError, IndexError):
print(
"Injected activity not found in DICOM header. Using default: 7400 MBq"
)
injected_activity = None

if hasattr(dicom_slices[0], "RadiopharmaceuticalInformationSequence"):
rp_seq = dicom_slices[0].RadiopharmaceuticalInformationSequence
if len(rp_seq) > 0:
try:
injected_activity = rp_seq[0].RadionuclideTotalDose

# Currently we don't have a way to know the units ... so we use common sense.
if injected_activity > 20000: # Activity likely in Bq instead of MBq
injected_activity /= 1e6
print(
f"Injected activity found in DICOM Header: {injected_activity:2.1f} MBq. Please verify."
)
except AttributeError:
# Sequence exists but RadionuclideTotalDose attribute is missing
print(
"RadiopharmaceuticalInformationSequence found but RadionuclideTotalDose is missing."
)
else:
# Sequence exists but is empty - this may indicate a data quality issue
print(
"Warning: RadiopharmaceuticalInformationSequence is empty. This may indicate a data quality issue."
)

if injected_activity is None:
print("Using default injected activity: 7400 MBq")
injected_activity = 7400.0

# Global attributes. Should be the same in all slices!
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