revice prepare script for a better mapping from projections to reconstructions and mu maps

.gitignore

+anonymous.md
 venv/
 **__pycache__/
 /data/

mu_map/data/dicom_util.py

+from datetime import datetime
+from enum import Enum
+
+import pydicom
+
+
+class DICOMTime(Enum):
+    Study = 1
+    Series = 2
+    Acquisition = 3
+    Content = 4
+
+    def date_field(self):
+        return f"{self.name}Date"
+
+    def time_field(self):
+        return f"{self.name}Time"
+
+    def to_datetime(self, dicom: pydicom.dataset.FileDataset) -> datetime:
+        _date = dicom[self.date_field()].value
+        _time = dicom[self.time_field()].value
+        return datetime(
+            year=int(_date[0:4]),
+            month=int(_date[4:6]),
+            day=int(_date[6:8]),
+            hour=int(_time[0:2]),
+            minute=int(_time[2:4]),
+            second=int(_time[4:6]),
+            # microsecond=int(_time.split(".")[1]),
+        )
+        
+
+def parse_age(patient_age: str) -> int:
+    """
+    Parse an age string as defined in the DICOM standard into an integer representing the age in years.
+
+    :param patient_age: age string as defined in the DICOM standard
+    :return: the age in years as a number
+    """
+    assert (
+        type(patient_age) == str
+    ), f"patient age needs to be a string and not {type(patient_age)}"
+    assert (
+        len(patient_age) == 4
+    ), f"patient age [{patient_age}] has to be four characters long"
+    _num, _format = patient_age[:3], patient_age[3]
+    assert (
+        _format == "Y"
+    ), f"currently, only patient ages in years [Y] is supported, not [{_format}]"
+    return int(_num)